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Do we know why communications with Beresheet and NASA were lost during the attempted landing of the Moon lander?

What would be the lightest possible moon launch vehicle?Do we still know more about the Moon than Antarctica?Why were we able to have a more or less real-time conversation with the Moon?Are the surfaces in permanent shadow in Moon craters 'fluffy'?How might the Lunar X Prize contestant spacecraft have navigated their descent from orbit, to landing?Are low, polar lunar orbits in general relatively stable?Could a revised Space Shuttle be sent to the moon with a lander as cargo?Were stereoscopic pictures taken during the Apollo missions?Why don't SpaceIL's Beresheet spacecraft and Moon orbits line up?ELI5: Why do they say that Israel would have been the fourth country to land a spacecraft on the Moon and why do they call it low cost?

6

$begingroup$

I was watching the livestream of the SpaceIL team when they were attempting to land Beresheet on the Moon. As near as I can remember, at around an altitude of 15km above the surface, the SpaceIL control team suddenly lost contact with both the spacecraft and NASA in the US. Communications with the lander picked up when the lander was about 2km above the surface and then lost again when they were unable to stop the descent. I don't remember them reestablishing contact with NASA.

Do we know what caused these communication outages? Was it a problem on the Beresheet side or Earth side? (Or am I totally misremembering what happened?)

the-moon beresheet spaceil

share|improve this question

asked Apr 14 at 21:14

MithrandirMithrandir

36839

$endgroup$

add a comment | 

6

$begingroup$

I was watching the livestream of the SpaceIL team when they were attempting to land Beresheet on the Moon. As near as I can remember, at around an altitude of 15km above the surface, the SpaceIL control team suddenly lost contact with both the spacecraft and NASA in the US. Communications with the lander picked up when the lander was about 2km above the surface and then lost again when they were unable to stop the descent. I don't remember them reestablishing contact with NASA.

Do we know what caused these communication outages? Was it a problem on the Beresheet side or Earth side? (Or am I totally misremembering what happened?)

the-moon beresheet spaceil

share|improve this question

asked Apr 14 at 21:14

MithrandirMithrandir

36839

$endgroup$

add a comment | 

$begingroup$

I was watching the livestream of the SpaceIL team when they were attempting to land Beresheet on the Moon. As near as I can remember, at around an altitude of 15km above the surface, the SpaceIL control team suddenly lost contact with both the spacecraft and NASA in the US. Communications with the lander picked up when the lander was about 2km above the surface and then lost again when they were unable to stop the descent. I don't remember them reestablishing contact with NASA.

Do we know what caused these communication outages? Was it a problem on the Beresheet side or Earth side? (Or am I totally misremembering what happened?)

the-moon beresheet spaceil

share|improve this question

asked Apr 14 at 21:14

MithrandirMithrandir

36839

$endgroup$

share|improve this question

asked Apr 14 at 21:14

MithrandirMithrandir

36839

share|improve this question

asked Apr 14 at 21:14

MithrandirMithrandir

36839

asked Apr 14 at 21:14

MithrandirMithrandir

36839

asked Apr 14 at 21:14

MithrandirMithrandir

36839

2 Answers
2

active

oldest

votes

4

$begingroup$

Earlier in the stream they mentioned a glitch or unusual behavior with the IMU, but contact remained.

Later in the burn the engine shutdown unexpectedly and they immediately reset the spacecraft to restore regular operation. This made the telemetry uplink drop out for a moment, before returning. It's not clear to me from the stream if the engine ever started again, and presumably the next signal loss is impact.

share|improve this answer

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  What's the IMU?
  $endgroup$
  – Mithrandir
  Apr 15 at 5:27
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @Mithrandir Inertial measurement unit, a tool used to get the approximate position of the spacecraft.
  $endgroup$
  – Antzi
  Apr 15 at 8:44
  

  
  
  
  

add a comment | 

4

$begingroup$

A recent update blames it on what I'd call a "command error"; apparently the full ramifications of the command that was sent weren't understood.

Six days after SpaceIL's Beresheet spacecraft crash-landed on the
lunar surface, we now have an explanation for what went wrong: A
software command uploaded to fix a sensor problem started a chain
reaction that shut down the main engines, dooming the lander.

it was the first time SpaceIL flight controllers had experienced an
IMU failure during the mission, and they sent an "activation command"
to restart the unit. Landsman said an IMU failure on its own would not
have caused Beresheet to crash, as the spacecraft has redundant units.

The Post report, as well as a SpaceIL press release from today, said
the command kicked off a chain reaction in the spacecraft that
ultimately caused an engine shutdown as Beresheet sped towards the
lunar surface. Landsman confirmed to me that the command was sent in
response to the IMU failure.

Would like more details though. Source.

share|improve this answer

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

$endgroup$

add a comment | 

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4

$begingroup$

Earlier in the stream they mentioned a glitch or unusual behavior with the IMU, but contact remained.

Later in the burn the engine shutdown unexpectedly and they immediately reset the spacecraft to restore regular operation. This made the telemetry uplink drop out for a moment, before returning. It's not clear to me from the stream if the engine ever started again, and presumably the next signal loss is impact.

share|improve this answer

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  What's the IMU?
  $endgroup$
  – Mithrandir
  Apr 15 at 5:27
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @Mithrandir Inertial measurement unit, a tool used to get the approximate position of the spacecraft.
  $endgroup$
  – Antzi
  Apr 15 at 8:44
  

  
  
  
  

add a comment | 

4

$begingroup$

Earlier in the stream they mentioned a glitch or unusual behavior with the IMU, but contact remained.

Later in the burn the engine shutdown unexpectedly and they immediately reset the spacecraft to restore regular operation. This made the telemetry uplink drop out for a moment, before returning. It's not clear to me from the stream if the engine ever started again, and presumably the next signal loss is impact.

share|improve this answer

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

$endgroup$

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  $begingroup$
  What's the IMU?
  $endgroup$
  – Mithrandir
  Apr 15 at 5:27
  

  
  
  
  


• 
  
  
  

  
  2
  

  
  
  
  
  
  

  
  $begingroup$
  @Mithrandir Inertial measurement unit, a tool used to get the approximate position of the spacecraft.
  $endgroup$
  – Antzi
  Apr 15 at 8:44
  

  
  
  
  

add a comment | 

$begingroup$

Earlier in the stream they mentioned a glitch or unusual behavior with the IMU, but contact remained.

Later in the burn the engine shutdown unexpectedly and they immediately reset the spacecraft to restore regular operation. This made the telemetry uplink drop out for a moment, before returning. It's not clear to me from the stream if the engine ever started again, and presumably the next signal loss is impact.

share|improve this answer

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

$endgroup$

share|improve this answer

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

edited Apr 18 at 0:12

Jerard Puckett

5,24622876

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

answered Apr 14 at 21:20

SaibooguSaiboogu

5,3242734

4

$begingroup$

A recent update blames it on what I'd call a "command error"; apparently the full ramifications of the command that was sent weren't understood.

Six days after SpaceIL's Beresheet spacecraft crash-landed on the
lunar surface, we now have an explanation for what went wrong: A
software command uploaded to fix a sensor problem started a chain
reaction that shut down the main engines, dooming the lander.

it was the first time SpaceIL flight controllers had experienced an
IMU failure during the mission, and they sent an "activation command"
to restart the unit. Landsman said an IMU failure on its own would not
have caused Beresheet to crash, as the spacecraft has redundant units.

The Post report, as well as a SpaceIL press release from today, said
the command kicked off a chain reaction in the spacecraft that
ultimately caused an engine shutdown as Beresheet sped towards the
lunar surface. Landsman confirmed to me that the command was sent in
response to the IMU failure.

Would like more details though. Source.

share|improve this answer

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

$endgroup$

add a comment | 

4

$begingroup$

A recent update blames it on what I'd call a "command error"; apparently the full ramifications of the command that was sent weren't understood.

Six days after SpaceIL's Beresheet spacecraft crash-landed on the
lunar surface, we now have an explanation for what went wrong: A
software command uploaded to fix a sensor problem started a chain
reaction that shut down the main engines, dooming the lander.

it was the first time SpaceIL flight controllers had experienced an
IMU failure during the mission, and they sent an "activation command"
to restart the unit. Landsman said an IMU failure on its own would not
have caused Beresheet to crash, as the spacecraft has redundant units.

The Post report, as well as a SpaceIL press release from today, said
the command kicked off a chain reaction in the spacecraft that
ultimately caused an engine shutdown as Beresheet sped towards the
lunar surface. Landsman confirmed to me that the command was sent in
response to the IMU failure.

Would like more details though. Source.

share|improve this answer

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

$endgroup$

add a comment | 

$begingroup$

A recent update blames it on what I'd call a "command error"; apparently the full ramifications of the command that was sent weren't understood.

Six days after SpaceIL's Beresheet spacecraft crash-landed on the
lunar surface, we now have an explanation for what went wrong: A
software command uploaded to fix a sensor problem started a chain
reaction that shut down the main engines, dooming the lander.

it was the first time SpaceIL flight controllers had experienced an
IMU failure during the mission, and they sent an "activation command"
to restart the unit. Landsman said an IMU failure on its own would not
have caused Beresheet to crash, as the spacecraft has redundant units.

The Post report, as well as a SpaceIL press release from today, said
the command kicked off a chain reaction in the spacecraft that
ultimately caused an engine shutdown as Beresheet sped towards the
lunar surface. Landsman confirmed to me that the command was sent in
response to the IMU failure.

Would like more details though. Source.

share|improve this answer

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

$endgroup$

share|improve this answer

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277

answered Apr 18 at 2:41

Organic MarbleOrganic Marble

65.3k4182277