Author Topic: SpaceIL Israeli Moon mission  (Read 64290 times)

Offline Phil Stooke

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Re: Spaceil Israeli Moon mission
« Reply #160 on: 03/18/2019 02:29 pm »
"and by the way, you forget the Apollo 17 explosive charges"

And the Apollo 16 mortars, 3 of which were fired.  Apollo 14 had the same but they were not fired.

Offline Phil Stooke

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Re: Spaceil Israeli Moon mission
« Reply #161 on: 03/18/2019 02:31 pm »
"Being a private mission is the realisation of the follow on missions in any way tied to this one successfully achieving its objectives?"

Success on this mission would certainly help. 

Offline mcgyver

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Re: Spaceil Israeli Moon mission
« Reply #162 on: 03/18/2019 05:07 pm »
Could this result in first lunar explosion in the history? After landing there's enough fuel left for a hop which won't be performed, and temperature will raise to 180C  without any thermal control.


I would be surprised if the Israeli engineers haven't thought of a way of purging fuel lines after landing, as is done on every other planetary lander.
and by the way, you forget the Apollo 17 explosive charges (and all of the spacecraft and stages that have impacted the moon in 60 years)
You are comparing a 10 billions mission to a 0.1 billions mission.
Something (like thermal control) had to be discarded.
I imagine a scenario where, after first fully functional day, they have to decide if to hop or not. "Ok, let's keep the fuel, just in case we want to hop tomorrow..."  ::)   OR "let's give up, we'll hop next time. Wait. Will it BE a next time? When? Give up? Why give up? all is working fine... discussion... discussion.... BOOOM"  ;)


Online Comga

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Re: Spaceil Israeli Moon mission
« Reply #163 on: 03/18/2019 09:46 pm »
Current N2YO track of Beresheet

BERESHEET

NORAD ID: 44049 
Int'l Code: 2019-009B 
Perigee: 2,786.9 km 
Apogee: 273,653.1 km 
Inclination: 27.1  
Period: 9,119.5 minutes 
Semi major axis: 144590 km 
RCS: Unknown 
Launch date: February 22, 2019
Source: Israel (ISRA)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

UTC:  22:41:44
LATITUDE: 6.32
LONGITUDE: -134.74
ALTITUDE [km]: 206303.25
SPEED [km/s]:  1.37
RIGHT ASCENSION: 01h 23m 55s 
DECLINATION: 05 14' 01'' 
Local Sidereal Time: 03h 25m 27s 
The satellite is in day light
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #164 on: 03/19/2019 01:09 am »
New TLE

Epoch 19077,95833333 18.03.2019 22:59:59 (19069.1828)(19066,5625)
e=0.9444759 (0.9366636) (0.9518981)
Mean Motion=325,9237 (0.15790329) (0,16162503)
inc=27,2623(27.0529) (27,786)
P=8 561,41 min (+151:59:30.36=9 119,51) (P=+148:29:30.67=8 909,51)

New TLE corresponding with spaceIL.

semi major axis 138629,888 (144 590,878) (142 362,608) km


my calculation:
According to TLE epochs 19077,9583 (19069.1828) (19066.5625) Period 8 561,41 min (9119,5 min) (8909,5 min)
Epoch perigeum
13.03.2019 13:48:58 (07.03.2019 14:06:37) (07.03.2019 12:58:28)
and T+(1 or 2)*P=19.03.2019 12:30:23 (20.03.2019 06:05:38) (19.03.2019 21:57:29)

By live.spaceil.com
Perigeum 19 Mar 2019 12:30:00
New TLE confirm this.
PM3 19 Mar 2019 12:30 UTC

Perigeum maneuver PM3 1319 km apogeum from 265000 to 412 000 km = delta_v 49 m/sec = 56 sec burning time = 7,27 kg propellant (for initial mass 467 kg, launch mass 530 kg (380 propellant +150 probe kg))
« Last Edit: 03/19/2019 01:18 am by lamid »

Offline shaile

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Re: Spaceil Israeli Moon mission
« Reply #165 on: 03/19/2019 12:10 pm »
Translation from Hebrew:
Link: https://www.facebook.com/SpaceIL/photos/a.157038247672351/2210231309019691/?type=3&theater

Today, at 12:30 UTC, a successful maneuver of Beresheet was carried out on its way to an elliptical orbit, that matches the planned Moon meeting, where the farthest point from Earth is about 405,000 km away.
During the maneuver, Beresheet's main engine was activated for about 60 seconds.

The spacecraft systems function as expected, communicate with the control room at Yahud, the flight control and flight dynamic teams managed to minimize the difficulties in star tracking by adapting the star tracking activation pattern so that all subsequent maneuvering stages are directed to space rather than to the Sun or Earth.

As the space travel continues, the amount of fuel in the spaceship tanks decreases, so this week we operated a "momentum wheel" that stabilizes the movement of the spacecraft so that the fuel shake in tanks will not shake it.

The engineering team is preparing to perform some small maneuvers to improve the spacecraft's path to the moon "capture" which is expected on 4 April.
« Last Edit: 03/19/2019 02:01 pm by shaile »

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #166 on: 03/19/2019 01:02 pm »

Offline shaile

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Re: Spaceil Israeli Moon mission
« Reply #167 on: 03/19/2019 02:01 pm »
« Last Edit: 03/19/2019 02:02 pm by shaile »

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #168 on: 03/19/2019 08:53 pm »
https://www.facebook.com/SpaceIL
דו"ח מסע לירח #6 = Moon Travel Report #6
14:30 IT , about 60 sec
https://twitter.com/TeamSpaceIL/status/1108018671132143616
...The engine was activated for 60 sec ...
https://twitter.com/lorengrush/status/1108012763073400834

For how accurate this maneuver must have been
is not enough information
60 sec? about 60 sec? interval from 55 to 64.99  sec?

Let's see what I show TLE and what will be shows on live.spaceil.com

Online Comga

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Re: Spaceil Israeli Moon mission
« Reply #169 on: 03/20/2019 09:43 pm »
BERESHEET

NORAD ID: 44049
UTC:            22:33:09
LATITUDE:   -3.36
LONGITUDE:   -153.14
ALTITUDE [km]:  254526.31
SPEED [km/s]:    1.24
AZIMUTH:   259.2 W
Local Sidereal Time:   05h 05m 36s
The satellite is in day light
SATELLITE PERIOD:   8562m

Int'l Code: 2019-009B 
Perigee: 1,268.5 km 
Apogee: 407,528.1 km 
Inclination: 25.0  
Period: 16,049.8 minutes  = 277.5 hr = 11.15 days
Semi major axis: 210769 km 
Launch date: February 22, 2019
Source: Israel (ISRA)
Launch site: AIR FORCE EASTERN TEST RANGE (AFETR)

Not sure why the first period listing is the old, smaller value, but the rest shows the new orbit and maximum altitude.
Regardless of what happens, Beresheet will be a Moon Mission of some type. ;)
Very much looking forward to further success.
As it says on the plaque: Am Yisroel Chai
« Last Edit: 03/20/2019 09:46 pm by Comga »
What kind of wastrels would dump a perfectly good booster in the ocean after just one use?

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #170 on: 03/21/2019 01:58 am »
Yes, new TLE
19079.85416667 Wed Mar 20 2019 20:30:00 
I=25.0088
e=0.9637541
MM=0.08972053

P=+267:29:50.30
a=210768.56
1261.36x407519.48 km





Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #171 on: 03/21/2019 12:50 pm »
According to the Planetary.org Table 36 hours after PM3, OPM Out of Plane Maneuver should follow.
According to TLE, the change in inclination is from 27.26 to 25 .
I don't know if that's right.
I usually follow the ellipse parameters and neglect this parameter in 3d.

Has SpaceIL merged these two maneuvers into one?
Would the burn-time match such a change?

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #172 on: 03/22/2019 01:55 am »
I tried to count the change inclination in perigeum
and my opinion
the TLE inclination 25 is not accurate,
for such a change in perigeum, the engine would have to burn for 60 minutes.
« Last Edit: 03/22/2019 02:18 am by lamid »

Offline shaile

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Re: Spaceil Israeli Moon mission
« Reply #173 on: 03/22/2019 03:49 am »
report #7
A free translation from https://www.facebook.com/SpaceIL/videos/2368612166705949/?v=2368612166705949  :
On Wednesday at 14:30 Israel Time an Out Of Plane Maneuver was carried out to change the inclination of the orbit.
This comes to optimize the moon capture path, to avoid passing behind the moon in inconvenient time and to avoid entering into the shadow of the moon.
« Last Edit: 03/22/2019 05:51 am by shaile »

Offline lamid

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« Last Edit: 03/22/2019 06:15 am by lamid »

Offline Bogeyman

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Re: Spaceil Israeli Moon mission
« Reply #175 on: 03/22/2019 11:04 am »
This is a really cool website: https://habr.com/ru/post/442922/?fbclid=IwAR1V2gpTxj32g_l_PiyZeUmAoNxkszqgTOE3xN7yT3hEofELGyttYpsT90c
It's all in Russian, but the images or graphics are mostly English.

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #176 on: 03/22/2019 05:50 pm »
from live.spaceIL.com

orbit state vektor
13 Mar 2019 21:34:00,000   -8290,83215   -1842,425137   -231,852826   1,888523   -8,304233   -4,309961
Convert orbit state vectors to Keplerian orbital elements:
a [km]          e []          i [deg]     RAAN [deg]  omega[deg]   theta [deg]
141584.56    0.9453     27.27       9.33            182.81          354.00

orbit state vektor
25 Mar 2019 05:27:00,000   408270,93902   89610,451389   6415,512066   -0,037506   0,165692   0,08007
Convert orbit state vectors to Keplerian orbital elements:
a [km]          e []          i [deg]     RAAN [deg]  omega[deg]   theta [deg]
212861,22    0.9630    25.25       10.51           182.06          180.00

inclination in perigeum inc=27.27, in apogeum inc=25.25
TLE epoch 19079.854 inc=25.0088 were published after OPM Out of Plane Maneuver,  Wed Mar 20 2019 20:30:00 (Wednesday at 12:30)

all OK

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #177 on: 03/23/2019 06:25 am »
Out of Plane Maneuver OPM 20.03.2019 12:30 UTC
my calculation:
Delta_V=50.5 m/s = burn-time 58 sec = propellant 7 kg

Edit: sorry, radian no deg
« Last Edit: 03/23/2019 07:05 am by lamid »

Offline lamid

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Re: Spaceil Israeli Moon mission
« Reply #178 on: 03/24/2019 10:15 am »
I made an animation to capture the probe in the orbit of the Moon.
Data from live.spaceil.com
Step 1 hour.

Offline Rondaz

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Re: Spaceil Israeli Moon mission
« Reply #179 on: 03/25/2019 06:47 pm »
Video of #Beresheet's landing leg deployment, recorded shortly after separation from the Falcon9 second stage on February 22. In the background, the launcher with the main payload, making attitude correction. Also in the background, the Moon.
@TeamSpaceIL

Yoav Landsman @MasaCritit

https://twitter.com/MasaCritit/status/1109820814860402688

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