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Zhongxing-9A (Chinasat-9A), CZ-3B/G2 - XSLC - June 18, 2017 (16:11 UTC)
by
beidou
on 13 Nov, 2012 17:14
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A short description (in Chinese) on this satellite:
"中星9A卫星（鑫诺4号）采用我国自主研发的东方红四号卫星平台，将提供18个36MHz带宽和4个54MHz带宽BSS规划频段转发器直播服务。中星9A卫星计划与中星9号直播卫星一起满足中国广播电视、数字电影、数字宽带多媒体系统及各种信息广播和娱乐广播的需求。"
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#1
by
Adonis1
on 14 Nov, 2012 15:01
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ChinaSat 9A ChinaSat 9A (SinoSat-4) is based on the DFH-4 satellite platform and will provide direct broadcast services with eighteen 36MHz and four 54MHz BSS Ku band transponders. Together with ChinaSat-9 direct broadcast satellite, ChinaSat-9A is designed to serve the radio and TV transmission, digital film and digital broadband multi-media system as well as information and entertainment broadcasting market.
http://www.chinasatcom.com/en/News_Info.aspx?m=20110329113845577061&n=20110329133944310204
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#2
by
beidou
on 04 Jul, 2016 20:10
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1) ChinaSat 9A
ChinaSat 9A (SinoSat-4) is based on the DFH-4 satellite platform and will provide direct broadcast services with eighteen 36MHz and four 54MHz BSS Ku band transponders. Together with ChinaSat-9 direct broadcast satellite, ChinaSat-9A is designed to serve the radio and TV transmission, digital film and digital broadband multi-media system as well as information and entertainment broadcasting market.
http://english.csat.spacechina.com/n931903/c931925/content.html
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#3
by
zubenelgenubi
on 31 May, 2017 19:22
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Cross-posting from the
Chinese launch schedule thread:
According to a post on the 9ifly Chinese space forum, there are informations about a commercial launch on June 13/17 (possibly ZX-9A Zhongxing-9A) and a Beidou-3 launch on July 13/17.
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#4
by
Galactic Penguin SST
on 02 Jun, 2017 15:29
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I wonder if this still used the old bus for SinoSat-4/ChinaSat-9A or if the Chinese built a new one? There were reports on the Chinese web some years ago that parts of it were removed for use on other satellites.
Of course, there are other comsats in other parts of the world that got stored even longer before eventual use so.....
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#5
by
Galactic Penguin SST
on 07 Jun, 2017 13:02
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#6
by
input~2
on 10 Jun, 2017 15:55
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A recent post on 9ifly makes reference to a launch on June 18 at 10pm (BST) /14:00 UTC
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#7
by
russianhalo117
on 10 Jun, 2017 17:27
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Stacking is completed, was not informed of the pad.
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#8
by
input~2
on 14 Jun, 2017 11:25
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Launch planned around 16:08 UTC
A1423/17 - A TEMPORARY RESTRICTED AREA ESTABLISHED WITHIN A CIRCLE CENTERED AT N2815E10201 WITH RADIUS OF 20KM, VERTICAL LIMITS: GND-UNL. GND - UNL, 18 JUN 16:01 2017 UNTIL 18 JUN 16:36 2017. CREATED: 14 JUN 11:05 2017
A1424/17 - A TEMPORARY RESTRICTED AREA ESTABLISHED BOUNDED BY:N272200E1083650-N273125E1074313-N271528E1073946-N270603E1083315 BACK TO START.VERTICAL LIMITS:GND-UNL. GND - UNL, 18 JUN 16:04 2017 UNTIL 18 JUN 16:40 2017. CREATED: 14 JUN 11:09 2017
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#9
by
Galactic Penguin SST
on 14 Jun, 2017 11:35
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Launch planned around 16:08 UTC
A1423/17 - A TEMPORARY RESTRICTED AREA ESTABLISHED WITHIN A CIRCLE CENTERED AT N2815E10201 WITH RADIUS OF 20KM, VERTICAL LIMITS: GND-UNL. GND - UNL, 18 JUN 16:01 2017 UNTIL 18 JUN 16:36 2017. CREATED: 14 JUN 11:05 2017
A1424/17 - A TEMPORARY RESTRICTED AREA ESTABLISHED BOUNDED BY:N272200E1083650-N273125E1074313-N271528E1073946-N270603E1083315 BACK TO START.VERTICAL LIMITS:GND-UNL. GND - UNL, 18 JUN 16:04 2017 UNTIL 18 JUN 16:40 2017. CREATED: 14 JUN 11:09 2017
Dunno what the source is but 9ifly has it at 16:12 UTC.
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#10
by
input~2
on 15 Jun, 2017 08:00
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A1436/17 - A TEMPORARY RESTRICTED AREA ESTABLISHED BOUNDED BY: N260808E1142921-N261444E1140013-N255858E1135553-N255223E1142456 BACK TO START.VERTICAL LIMITS:GND-UNL. GND - UNL, 18 JUN 16:05 2017 UNTIL 18 JUN 16:51 2017. CREATED: 14 JUN 23:37 2017
2 NOTAMed areas for resp. boosters and fairing debris indicated in the figure below:
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#11
by
Galactic Penguin SST
on 18 Jun, 2017 15:36
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2 recent photos that shows that this launch is very much still on:
Sources:
[1] [2]
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#12
by
Chris Bergin
on 18 Jun, 2017 16:21
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2 recent photos that shows that this launch is very much still on:
Sources: [1] [2]
LC-3?
LC-2 apparently, but a lot of people, waiting for a launch post, just got a notification for that, so some restraint would be advised until after launch.
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#13
by
Galactic Penguin SST
on 18 Jun, 2017 16:22
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2 recent photos that shows that this launch is very much still on:
Sources: [1] [2]
LC-3?
That's LC-2.
-------------------------------------
Liftoff confirmed!
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#14
by
Chris Bergin
on 18 Jun, 2017 16:24
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#15
by
input~2
on 18 Jun, 2017 16:28
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yes, references to "earthquake" on Weibo
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#16
by
Galactic Penguin SST
on 18 Jun, 2017 17:58
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Dunno what's going on but there's no news since T-0 and that Chinese "insider" who has been very helpful with launch alerts
tweeted "Cough". Uh, I'm not sure that's a good or bad sign.....
It's 2 am here so I'm off for now...
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#17
by
russianhalo117
on 18 Jun, 2017 18:15
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China Spaceflight saying all media and officials silent. looking at tv sites they are no longer mentioning the launch in news tickers. also tracking sites not yet found anything on the orbit.
Latest Status update:
https://twitter.com/cnspaceflight
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#18
by
Skyrocket
on 18 Jun, 2017 19:29
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China Spaceflight saying all media and officials silent. looking at tv sites they are no longer mentioning the launch in news tickers. also tracking sites not yet found anything on the orbit.
Latest Status update: https://twitter.com/cnspaceflight
Not a good sign...
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#19
by
Alter Sachse
on 18 Jun, 2017 19:53
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China Spaceflight saying all media and officials silent. looking at tv sites they are no longer mentioning the launch in news tickers. also tracking sites not yet found anything on the orbit.
Latest Status update: https://twitter.com/cnspaceflight
Not a good sign...
It reminds me of the Gaofen 10 launch...
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#20
by
input~2
on 18 Jun, 2017 21:37
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About launch mission codenames:
- This one was 07-79
- Last launch from Xichang was 07-77 (SJ-13) in April
- A poster on 9ifly speculates that 07-78 "should be the postponed launch of CZ-2C from Xichang"
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#21
by
Galactic Penguin SST
on 18 Jun, 2017 22:34
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China Spaceflight saying all media and officials silent. looking at tv sites they are no longer mentioning the launch in news tickers. also tracking sites not yet found anything on the orbit.
Latest Status update: https://twitter.com/cnspaceflight
Not a good sign...
It reminds me of the Gaofen 10 launch...
Maybe the orbit is low. Anything on NORAD yet?
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#22
by
Galactic Penguin SST
on 18 Jun, 2017 23:20
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#23
by
russianhalo117
on 18 Jun, 2017 23:42
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#24
by
jcm
on 19 Jun, 2017 00:03
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#25
by
russianhalo117
on 19 Jun, 2017 00:05
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China Spaceflight saying all media and officials silent. looking at tv sites they are no longer mentioning the launch in news tickers. also tracking sites not yet found anything on the orbit.
Latest Status update: https://twitter.com/cnspaceflight
Not a good sign...
It reminds me of the Gaofen 10 launch...
Maybe the orbit is low. Anything on NORAD yet?
Not sure how credible but here's a rumor of lower orbit than planned but the satellite's healthy.
Civil Tracking sites still have found nothing in the planned target injection orbit. Havent seen anything from NORAD or USSTRATCOM so far.
https://nssdc.gsfc.nasa.gov/nmc/SpacecraftQuery.jsp also doesnt find anything on orbit.
Yes, but NORAD/USSTRATCOM release of data to e.g. space-track.org has been running about a day late
for the past few months. So I don't expect anything till tomorrow.
correct. just responding to GP's post. I should have put in a it takes a while to receive disclaimer in like you did in my post.
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#26
by
Galactic Penguin SST
on 19 Jun, 2017 03:47
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#27
by
Alter Sachse
on 19 Jun, 2017 05:24
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A half day away and only the "Sound of silence"
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#28
by
Galactic Penguin SST
on 19 Jun, 2017 07:00
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Finally a terse official statement has come from CASC confirming that a problem on the rocket 3rd stage has put the satellite in a wrong orbit. It also confirms that the solar arrays and antennas on the satellite have been deployed.
http://m.spacechina.com/n1105979/c1670019/content.html
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#29
by
Phillip Clark
on 19 Jun, 2017 07:21
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I wonder what the "effective measures" are that are being taken ..........
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#30
by
chewi
on 19 Jun, 2017 08:15
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New broadcasting satellite fails to enter preset orbithttp://news.xinhuanet.com/english/2017-06/19/c_136377564.htmXICHANG, Sichuan, June 19 (Xinhua) -- A broadcasting satellite, which was launched aboard the Long March-3B carrier rocket from southwest China's Xichang Satellite Launch Center at 12:11 a.m. Monday, failed to enter the preset orbit.
The exact reason for the failure of the radio and television broadcasting satellite is under investigation.
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#31
by
GELORD
on 19 Jun, 2017 08:56
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Start Time 00:10:28 Beijing
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#32
by
SmallKing
on 19 Jun, 2017 09:01
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Start Time 00:10:28 Beijing
It is not the official time
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#33
by
Galactic Penguin SST
on 19 Jun, 2017 10:52
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Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
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#34
by
input~2
on 19 Jun, 2017 11:24
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42764/2017-035B: 192 x 16358 km x 25.68 deg.
small edit for Object B: 192 x 16354 km x 25.68°
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#35
by
Phillip Clark
on 19 Jun, 2017 11:37
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Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
I am sure that the altitude is too low for the satellite to get into GEO - and of course changing the inclination is the real killer.
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#36
by
chewi
on 19 Jun, 2017 12:01
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1st LD: New broadcasting satellite fails to enter preset orbithttp://news.xinhuanet.com/english/2017-06/19/c_136377715.htmXICHANG, Sichuan, June 19 (Xinhua) -- Communications satellite Zhongxing-9A, which was launched aboard the Long March-3B carrier rocket from southwest China's Xichang Satellite Launch Center at 12:11 a.m. Monday, has failed to enter the preset orbit.
Abnormal performance was identified during the third phase of the rocket launch, said the China Aerospace Science and Technology Corporation (CASC) Monday.
The exact reason for the failure is under investigation and related parties are taking measures to address the problem and send the satellite into the correct orbit.
The solar panels and communication antennae, however, have been deployed and the satellite system is operating under normal conditions, according to the CASC.
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#37
by
eeergo
on 19 Jun, 2017 12:20
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Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
That would make a dV to GEO of ~2100 m/s. Assuming a standard GTO with dV~1700 m/s, there is a ~400 m/s shortfall. This is about the dV budget for 8-10 years of GEO orbit- and station-keeping. Unless they can come up with creative ways of salvaging the orbit at the expense of less lifetime/fuel (à la Asiasat 3), it looks like a major loss. Of course, this bird may not be insured being a Government payload, so maybe they'll try to squeeze as much life out of it as they can, rather than ditch it to claim the insurance money.
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#38
by
input~2
on 19 Jun, 2017 18:38
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2017-035A 42763 CHINASAT 9A 294.22min 25.67° 16361km 190km
2017-035B 42764 CZ-3B R/B 294.15min 25.68° 16353km 193km
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#39
by
input~2
on 19 Jun, 2017 19:30
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Rare pictures of the launch courtesy of Swiss watch Tag Heuer's cooperation with CASC
source
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#40
by
jcm
on 19 Jun, 2017 19:41
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Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
That would make a dV to GEO of ~2100 m/s. Assuming a standard GTO with dV~1700 m/s, there is a ~400 m/s shortfall. This is about the dV budget for 8-10 years of GEO orbit- and station-keeping. Unless they can come up with creative ways of salvaging the orbit at the expense of less lifetime/fuel (à la Asiasat 3), it looks like a major loss. Of course, this bird may not be insured being a Government payload, so maybe they'll try to squeeze as much life out of it as they can, rather than ditch it to claim the insurance money.
I calculate that you'd need 545 m/s to change this orbit into one with a standard GTO apogee of 35870 km,
a rather bigger shortfall that your calculation.
It would require a further 175 m/s to reach the 49600 km supersync apogee used by this mission's elder sibling, ZX-9.
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#41
by
saliva_sweet
on 19 Jun, 2017 19:55
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I calculate that you'd need 545 m/s to change this orbit into one with a standard GTO apogee of 35870 km,
a rather bigger shortfall that your calculation.
It would require a further 175 m/s to reach the 49600 km supersync apogee used by this mission's elder sibling, ZX-9.
Sounds like a LOM to me
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#42
by
Alter Sachse
on 20 Jun, 2017 04:20
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#43
by
Lewis007
on 20 Jun, 2017 06:54
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Short launch video
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#44
by
Steven Pietrobon
on 20 Jun, 2017 08:17
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Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I calculate that you'd need 545 m/s to change this orbit into one with a standard GTO apogee of 35870 km,
a rather bigger shortfall that your calculation.
I seem to confirm that, assuming no change in inclination for the perigee burn. Perhaps Galactic Penguin calculations assumed a small change in inclination at perigee to optimise overall total delta-V.
Vp = sqrt(2µ/(Rp(Rp/Ra+1)))
Va = sqrt(2µ/(Ra(Ra/Rp+1)))
Vo = sqrt(µ/Ro)
Rp = R+Hp
Ra = R+Ha
Ro = R+Ho
R = 6378165 m
µ = 3.986005x10^14 m³/s²
Hp1 = 193 km
Ha1 = 16357 km
Vp1 = 9701.3 m/s
Hp2 = 193 km
Ha2 = 35870 km
Vp2 = 10246.4 m/s
Va2 = 1593.7 m/s
Δv1 = Vp2-Vp1 =
545.1 m/sHo = 35870 km
Vo = 3071.6 m/s
θ = 25.68º
Δv2 = sqrt(Vo² + Va2² - 2 Vo Va2 cos(θ)) =
1775.2 m/sΔv = Δv1 + Δv2 = 2320.3 m/s
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#45
by
Steven Pietrobon
on 20 Jun, 2017 09:56
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OK, I've written a small program to see what savings an inclination change on the first burn would give. Its not much. Total delta-V is reduced from 2320.2 m/s to 2316.3 m/s, a saving of only 3.9 m/s. Excess delta-V is reduced to 2316.3-1775.2 = 541.1 m/s.
Enter initial perigee (km): 193
Enter initial apogee (km): 16357
Enter initial inclination (deg): 25.68
theta1 = 0.00 deg, dv1 = 545.1 m/s
theta2 = 25.68 deg, dv2 = 1775.2 m/s
dv = 2320.2 m/s
theta1 = 0.37 deg, dv1 = 548.9 m/s
theta2 = 25.31 deg, dv2 = 1767.5 m/s
dv = 2316.3 m/s
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#46
by
Alter Sachse
on 21 Jun, 2017 05:34
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#47
by
input~2
on 21 Jun, 2017 07:14
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#48
by
SmallKing
on 21 Jun, 2017 14:08
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#49
by
input~2
on 21 Jun, 2017 14:42
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#50
by
tvg98
on 21 Jun, 2017 14:59
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Full article: https://mp.weixin.qq.com/s/xmhpqx6XsXnFwBx0P47n3w
According to the same interview, reaching final orbit will take 20 days and satellite lifetime could be 5 years down from 15 years
Unless the translation I have is poor, the satellite's lifespan has been reduced to 5 years, meaning it lost 10 years of its total lifespan.
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#51
by
input~2
on 21 Jun, 2017 15:02
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Full article: https://mp.weixin.qq.com/s/xmhpqx6XsXnFwBx0P47n3w
According to the same interview, reaching final orbit will take 20 days and satellite lifetime could be 5 years down from 15 years
Unless the translation I have is poor, the satellite's lifespan has been reduced to 5 years, meaning it lost 10 years of its total lifespan.
Yes that's what I meant
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#52
by
Phillip Clark
on 29 Jun, 2017 12:25
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Has Zhongxing 9A been de-orbited? The following orbit is derived from the latest element set issued for the catalogue number/international designator of the satellite:
Jun 19.304 26.82 deg 306.20 min 251 - 17,090 km 185 deg (AoP)
My guess is that all of the data for the 25.68 deg, ~192 - ~ 16,360 km orbits relate to the CZ-3B/E third stage. With no data for the satellite for ten days, the possibility that the satellite is no longer in orbit must be considered.
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#53
by
BabaORileyUSA
on 29 Jun, 2017 14:11
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Has Zhongxing 9A been de-orbited? The following orbit is derived from the latest element set issued for the catalogue number/international designator of the satellite:
Jun 19.304 26.82 deg 306.20 min 251 - 17,090 km 185 deg (AoP)
My guess is that all of the data for the 25.68 deg, ~192 - ~ 16,360 km orbits relate to the CZ-3B/E third stage. With no data for the satellite for ten days, the possibility that the satellite is no longer in orbit must be considered.
No, it wasn't likely to have been de-orbited. For some time, JSpOC/18SPCS, lacking input from satellite owner/operators, has delayed the publication of an element set until the payload reaches its final orbit.
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#54
by
Phillip Clark
on 29 Jun, 2017 15:23
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Has Zhongxing 9A been de-orbited? The following orbit is derived from the latest element set issued for the catalogue number/international designator of the satellite:
Jun 19.304 26.82 deg 306.20 min 251 - 17,090 km 185 deg (AoP)
My guess is that all of the data for the 25.68 deg, ~192 - ~ 16,360 km orbits relate to the CZ-3B/E third stage. With no data for the satellite for ten days, the possibility that the satellite is no longer in orbit must be considered.
No, it wasn't likely to have been de-orbited. For some time, JSpOC/18SPCS, lacking input from satellite owner/operators, has delayed the publication of an element set until the payload reaches its final orbit.
Routinely for Chinese missions we don't get the intermediate orbits catalogued between GTO and GEO, but a ten days gap is rather unusual.
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#55
by
BabaORileyUSA
on 29 Jun, 2017 16:52
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Has Zhongxing 9A been de-orbited? The following orbit is derived from the latest element set issued for the catalogue number/international designator of the satellite:
Jun 19.304 26.82 deg 306.20 min 251 - 17,090 km 185 deg (AoP)
My guess is that all of the data for the 25.68 deg, ~192 - ~ 16,360 km orbits relate to the CZ-3B/E third stage. With no data for the satellite for ten days, the possibility that the satellite is no longer in orbit must be considered.
No, it wasn't likely to have been de-orbited. For some time, JSpOC/18SPCS, lacking input from satellite owner/operators, has delayed the publication of an element set until the payload reaches its final orbit.
Routinely for Chinese missions we don't get the intermediate orbits catalogued between GTO and GEO, but a ten days gap is rather unusual.
Usually, a bird takes less than that amount of time to reach GEO. This wounded duck, however, will probably require a bit more time to reach GEO from where it was dropped off....
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#56
by
Alter Sachse
on 30 Jun, 2017 13:09
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Has Zhongxing 9A been de-orbited? The following orbit is derived from the latest element set issued for the catalogue number/international designator of the satellite:
Jun 19.304 26.82 deg 306.20 min 251 - 17,090 km 185 deg (AoP)
My guess is that all of the data for the 25.68 deg, ~192 - ~ 16,360 km orbits relate to the CZ-3B/E third stage. With no data for the satellite for ten days, the possibility that the satellite is no longer in orbit must be considered.
No, it wasn't likely to have been de-orbited. For some time, JSpOC/18SPCS, lacking input from satellite owner/operators, has delayed the publication of an element set until the payload reaches its final orbit.
Routinely for Chinese missions we don't get the intermediate orbits catalogued between GTO and GEO, but a ten days gap is rather unusual.
Usually, a bird takes less than that amount of time to reach GEO. This wounded duck, however, will probably require a bit more time to reach GEO from where it was dropped off....
http://forum.nasaspaceflight.com/index.php?topic=30336.msg1692336#msg1692336at least 20 days
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#57
by
Galactic Penguin SST
on 06 Jul, 2017 01:51
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ChinaSat 9A has arrived in geostationary orbit on July 5 according to Chinese reports.
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#58
by
SmallKing
on 06 Jul, 2017 04:34
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#59
by
Phillip Clark
on 06 Jul, 2017 05:24
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Congratulations on reaching GEO but what will the operational lifetime of the satellite be now with so much propellant unexpectedly required to get on-station?
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#60
by
chewi
on 06 Jul, 2017 05:47
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Chinese satellite Zhongxing-9A enters preset orbit
http://news.xinhuanet.com/english/2017-07/06/c_136422178.htmBEIJING, July 6 (Xinhua) -- The communications satellite Zhongxing-9A has entered its preset orbit over two weeks after its launch on June 19.
Abnormal performance was identified during the third phase of the Long March-3B launch, which failed to deliver the satellite as planned.
The satellite conducted 10 orbit adjustments with its onboard thrusters and Wednesday reached its preset orbit at 101.4 degrees east longitude over the equator, according to China Aerospace Science and Technology Corporation (CASC) Thursday.
Currently, the satellite's systems are operational and the transponders are on, said the CASC, adding that a series of tests will be carried out.
Zhongxing-9A is the first Chinese-made satellite for live radio and television broadcasts.
An anomaly was found on the carrier rocket's rolling control thruster, part of the attitude control engine, during the third gliding phase, according to an investigation.
The rocket team has also completed a thorough technology analysis and expanded examinations.
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#61
by
Galactic Penguin SST
on 06 Jul, 2017 12:01
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Investigation shown RCS thruster malfunction led to this failure
http://www.spacechina.com/n25/n144/n206/n214/c1679151/content.html
To elaborate, the official statement points to "a failure of the roll-control RCS thrusters of the third stage during the coast phase" as to the cause.
This was actually first reported back on June 21 in an interview with ex-Long March 3 development program manager/chief designer Long Lehao (*) - he said that "......the rocket stage was in a negative roll rate during coasting, which should have been corrected through negative feedback with a positive roll rate command, but it went wrong during actual operations......".
I take that means it's more of a GNC/sensor failure than actual hardware failing, but that's just me.
Back to the satellite, it turns out that I was right in that it was really the ex-SinoSat-4 that was stored for 6 years (2010-2016) due to lack of satellite DBS demands.
The satellite eventually reached 101.4 deg. East on July 5 at around 13:00 UTC.
One last thing - the s/n for the LM-3B is Y28.
(*) Despite long retired and well into the 90s, he is still one of the "default spokesperson" for reporters asking about Chinese rockets. He apparently still follows around rocket launches in the LCC, including the ill-fated LM-5 flight last week!
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#62
by
input~2
on 06 Jul, 2017 13:34
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No new TLE from Spacetrack since June 19
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#63
by
Phillip Clark
on 06 Jul, 2017 14:13
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Galactic Penguin ...... which CZ-3B please?
I always wonder why the Chinese translate the launch vehicle names from Changzheng to "Long March" when discussing them, but the satellite/spacecraft names are not similarly translated, other than just in passing occasionally.
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#64
by
Liss
on 08 Jul, 2017 20:16
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At last found at 101.4 E.
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#65
by
linxiaoyi
on 09 Jul, 2017 05:03
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New TLE：
edit: satellite is confirmed at 101.4°E from new TLE
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#66
by
SmallKing
on 24 Jul, 2017 01:21
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#67
by
Phillip Clark
on 24 Jul, 2017 05:52
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New TLE：
edit: satellite is confirmed at 101.4°E from new TLE
The data which you show are from the Satellite Situation Report: they are not a Two-Line Orbital Element.
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#68
by
sunzhe
on 04 Oct, 2017 12:08
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Does anyone know the final estimated residual useful life of this one please?
Many thanks
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#69
by
SmallKing
on 04 Oct, 2017 13:39
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Does anyone know the final estimated residual useful life of this one please?
Many thanks
Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
That would make a dV to GEO of ~2100 m/s. Assuming a standard GTO with dV~1700 m/s, there is a ~400 m/s shortfall. This is about the dV budget for 8-10 years of GEO orbit- and station-keeping. Unless they can come up with creative ways of salvaging the orbit at the expense of less lifetime/fuel (à la Asiasat 3), it looks like a major loss. Of course, this bird may not be insured being a Government payload, so maybe they'll try to squeeze as much life out of it as they can, rather than ditch it to claim the insurance money.
I calculate that you'd need 545 m/s to change this orbit into one with a standard GTO apogee of 35870 km,
a rather bigger shortfall that your calculation.
It would require a further 175 m/s to reach the 49600 km supersync apogee used by this mission's elder sibling, ZX-9.
About 5 years left
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#70
by
SmallKing
on 17 Oct, 2017 04:29
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#71
by
sunzhe
on 01 Nov, 2017 13:23
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Does anyone know the final estimated residual useful life of this one please?
Many thanks
Orbit data now in:
42763/2017-035A: 193 x 16357 km x 25.68 deg.
42764/2017-035B: 192 x 16358 km x 25.68 deg.
I'm not even sure that's salvageable....
That would make a dV to GEO of ~2100 m/s. Assuming a standard GTO with dV~1700 m/s, there is a ~400 m/s shortfall. This is about the dV budget for 8-10 years of GEO orbit- and station-keeping. Unless they can come up with creative ways of salvaging the orbit at the expense of less lifetime/fuel (à la Asiasat 3), it looks like a major loss. Of course, this bird may not be insured being a Government payload, so maybe they'll try to squeeze as much life out of it as they can, rather than ditch it to claim the insurance money.
I calculate that you'd need 545 m/s to change this orbit into one with a standard GTO apogee of 35870 km,
a rather bigger shortfall that your calculation.
It would require a further 175 m/s to reach the 49600 km supersync apogee used by this mission's elder sibling, ZX-9.
About 5 years left
Hello Dear, did you mean, even though after saving 100KG more Propellant, there are still only 5 years left? Oh no......
The satellite eventually reached 101.4 deg. East on July 5 at around 13:00 UTC.