Author Topic: Satellites leaving 74E  (Read 2704 times)

Offline hvdh

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Satellites leaving 74E
« on: 01/10/2017 06:14 PM »
Is or has Gsat-14 been in use at all at 74.0E? No entries can be found in Lyngsat or Flysat.
Because yesterday's TLE had it near 64E, drifting West 0.6/day. It could be the occasional wrong TLE, though.

P.S. I see a warning this is an old topic, should I have post in the general ISRO thread instead?
Or not at all maybe, about possible relocations and other events in the mature satellite life?  ;)

Offline hvdh

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Re: Satellites leaving 74E
« Reply #1 on: 01/13/2017 03:21 PM »
The TLE's were corrected, instead of Gsat-14, it's Insat-4CR drifting West.
This should mean Gsat-14 has taken over Insat-4CR services in Ku-band (11.45...11.7 GHz).

Offline hvdh

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Re: Satellites leaving 74E
« Reply #2 on: 01/14/2017 04:13 PM »
And now since a few days, we also have Insat-3C leaving 74.0E, drifting East 0.5/day.
Insat-4CR still drifting West 0.7/day, near 61E now.
These slow drift speeds are more typical for relocation than for end-of-life manoevring.

After some further reading, I understand Gsat-18 is intended to replace both 3C and 4CR.
Gsat-18 is at 74.0E since 21 Oct 2016. So very recently, services must have switched to Gsat-18.
Anyone knows more?

Leaves me wondering what the smaller Gsat-14 is doing now, backup capacity?
« Last Edit: 01/14/2017 07:33 PM by input~2 »

Offline c.hazra200

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Re: Satellites leaving 74E
« Reply #3 on: 01/15/2017 01:47 AM »
And now since a few days, we also have Insat-3C leaving 74.0E, drifting East 0.5/day.
Insat-4CR still drifting West 0.7/day, near 61E now.
These slow drift speeds are more typical for relocation than for end-of-life manoevring.

After some further reading, I understand Gsat-18 is intended to replace both 3C and 4CR.
Gsat-18 is at 74.0E since 21 Oct 2016. So very recently, services must have switched to Gsat-18.
Anyone knows more?

Leaves me wondering what the smaller Gsat-14 is doing now, backup capacity?

At east where INSAT-3C is going ? 82E ?
As for INSAT-4CR, after decommissioning of GSAT-3/EDUSAT INSAT-4CR took the role of EDUSAT. CAG in its dth report slammed ISRO for poor planning as it launched GSAT-14(replacement of EDUSAT) too late for which ISRO forced Airtel digital TV to vacant INSAT-4CR as there was no alternative. According to that CAG report GSAT-9 was originally intended to be used as a spare satellite from 48E but after new SAARC satellite plan role of GSAT-9 changed & will be used from any of the prime slots of ISRO.
« Last Edit: 01/15/2017 03:22 AM by c.hazra200 »

Offline hvdh

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Re: Satellites leaving 74E
« Reply #4 on: 02/09/2017 10:21 PM »
INSAT-4CR has stopped at about 47.9E, indeed probably to reserve this 48E slot.
INSAT-3C still drifting East, now near 88E.

Offline hvdh

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Re: Satellites leaving 74E
« Reply #5 on: 02/27/2017 04:03 PM »
Finally, INSAT-3C (with inclination 0.4) has also arrived according TLE.
At 93.5 East, joining INSAT-4B and GSAT-15.

Offline vyoma

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Re: Satellites leaving 74E
« Reply #6 on: 03/29/2017 11:24 PM »
http://www.thehindu.com/news/national/5-new-satellites-this-year-to-raise-isro-capacity/article17740909.ece

Quote
After INSAT-4CR was moved to a new orbital slot a few months ago, its efficiency has been improved and a little extra capacity created for select use, he said.

Offline hvdh

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Re: Satellites leaving 74E
« Reply #7 on: 08/13/2017 08:35 AM »
INSAT-3C stayed at 93.5E until July 18, since then the orbit was raised 3 times.
Now near 16E, drifting 3.5 W per day.
I think this was the end-of-life manoeuver, can anyone give confirmation?

Offline input~2

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Re: Satellites leaving 74E
« Reply #8 on: 08/13/2017 09:14 AM »
INSAT-3C stayed at 93.5E until July 18, since then the orbit was raised 3 times.
Now near 16E, drifting 3.5 W per day.
I think this was the end-of-life manoeuver, can anyone give confirmation?

Confirmation can be found indirectly in the answer to a question raised during 16th Lok Sabha on July 26:

Quote from:  Sixteenth Lok Sabha
                                                       GOVERNMENT OF INDIA
                                                          MINISTRY OF SPACE
                                                                LOK SABHA
UNSTARRED   QUESTION NO:   1824
ANSWERED ON:    26.07.2017
Indigenous Satellites
KAPIL MORESHWAR PATIL
RAOSAHEB PATIL DANVE
Will the PRIME MINISTER be pleased to state:


(a) the details of satellites being operated by the country at present;
(b) whether the Government is seeking foreign aid/cooperation for operating these satellites and if so, the amount of fund spent for operation of foreign satellites each year;
(c) the extent to which indigenous satellites are being used; and
(d) the modalities worked out by the Government for developing indigenous satellites in the country?


ANSWER
 MINISTER OF STATE IN THE MINISTRY OF PERSONNEL, PG & PENSIONS AND IN THE PRIME MINISTERS OFFICE
(DR. JITENDRA SINGH):

(a)   At present, there are 42 Indian satellites operational in orbit comprising of:

i.  Fifteen Communication Satellites namely, INSAT-4A, 4B & 4CR, GSAT-6, 7, 8, 9, 10, 12, 14, 15, 16, 17, 18 & 19.
ii.   Fourteen Earth Observation Satellites namely, Resourcesat-1, 2 & 2A, RISAT-2, Cartosat-1, Cartosat-2, Cartosat-2 Series (5 Nos.), Oceansat-2, SARAL & SCATSAT-1.
iii.   Four Meteorological Satellites namely, Kalpana-1, INSAT-3D& 3DR and Megha-Tropiques.
iv.   Seven Navigational Satellites namely, IRNSS-1A, 1B, 1C, 1D, 1E, 1F & 1G.
v.   Two Space Science Satellites namely, Mars Orbiter Mission & Astrosat.

(b)   No, Madam. Government is not seeking any foreign aid/ cooperation for operating these satellites. Indian Space Research Organisation (ISRO) is not operating any foreign satellites.

(c)   The currently operational indigenous satellites are being utilised to support various applications and services in the area of resource monitoring, weather forecasting, telecommunication, broadcasting, disaster management, location based services, including host of societal applications.

(d)   ISRO has been developing satellites indigenously since 1975. Except the first generation INSAT satellites, all communication satellites have been built indigenously. All the earth observation, meteorological, navigation and space science satellites have been developed indigenously by ISRO.

From the answer to point (a), Insat-3C is not part of the Indian currently operational communication satellites, so its current orbit (36010 x 36109 km) is presumably a graveyard orbit

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