Author Topic: SpaceX Falcon 9 : NROL-87 : SLC-4E Vandenberg : 2 February 2022 (20:27 UTC)  (Read 72379 times)

Offline Conexion Espacial

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First official SpaceX images of the launch (taken from the code of the page), in a few hours more and with better quality will be released.
I publish information in Spanish about space and rockets.
www.x.com/conexionspacial

Offline Conexion Espacial

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I publish information in Spanish about space and rockets.
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Offline Conexion Espacial

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I publish information in Spanish about space and rockets.
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Offline Conexion Espacial

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« Last Edit: 02/03/2022 12:26 am by Conexion Espacial »
I publish information in Spanish about space and rockets.
www.x.com/conexionspacial

Offline JuaniX

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From this:
New T-0 announced on the Countdown Net:
20:27:26 Z (UTC) -- 12:27:26 Z Local (PST)
Quote
Attention on Countdown 1, this is Launch Director.
Mission Director has implemented a new T-0.
The new T-0 is 20 : 27 : 26 Zulu; That's 12:27 and 26 seconds Local.

And the official webcast:
https://youtube.com/watch?v=bVk8XyjhTKo

I produced this little table:
T+min:sec      UTC      Event
00:00      20:27:26      Lift-off
01:00      20:28:26      Supersonic
01:10      20:28:36      Max Q (moment of peak mechanical stress on the rocket)
02:24      20:29:50      1st stage main engine cutoff (MECO)
02:27      20:29:53      1st and 2nd stages separate
02:35      20:30:01      2nd stage engine starts
02:36      20:30:02      1st stage boostback burn begins
02:45      20:30:11      Fairing deployment
03:19      20:30:45      1st stage boostback burn complete
06:32      20:33:58      1st stage entry burn begins
06:55      20:34:21      1st stage entry burn complete
07:42      20:35:08      1st stage landing burn begins
08:15      20:35:41      1st stage lands on Landing Zone 4

Cheers!
Lanzamientos Espaciales - Launch calendar in Spanish, and further info on spaceflight - https://lanzamientosespaciales.com
Everyday Astronaut - Collaborating in bringing space down to Earth for everyday people - https://everydayastronaut.com


« Last Edit: 02/03/2022 05:40 am by Chinakpradhan »








Offline OneSpeed

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Here is a comparison of the first stage telemetry from the CSG-2 and NROL-87 webcasts.

1. NROL-87 spent much longer in the throttle bucket for Max-Q, perhaps reflecting increased sensitivity to an NROL mission failure.

2. NROL-87 MECO was at 1680m/s, compared to CSG-2 at 1660m/s. This extra velocity lead to increased 'hang time', apogee, and elapsed time to RTLS.

3. Apart from NROL-87, I don't have complete first stage telemetry for any Vandenberg RTLS missions to SSO. However, the recent CSG-2 mission from the Cape was also to SSO, with the additional requirement of doglegs by both stages. The CSG-2 payload was ~2,205kg, so the NROL-87 payload should have been substantially greater than 2,205kg.

4. SAOCOM-1A was another Vandenberg RTLS mission to SSO, with the additional requirement of direct injection to a 625km circular orbit. It delivered 3,000kg, so NROL-87 should also be heavier than 3,000kg.

5. The SHERPA mission from Vandenberg to SSO required a drone ship landing, and the payload was 4,000kg, so the NROL-87 payload should be somewhat less than 4,000kg.

Offline Star One

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I wonder if this obviously fake aircraft that has suddenly appeared at Area 51 is a calibration target for this mission.

https://www.thedrive.com/the-war-zone/44057/mysterious-aircraft-spotted-at-area-51-in-unprecedented-satellite-image

Offline Rondaz

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Remote wide angle video shot of SpaceX Falcon 9 - NROL-87 launching and landing w/ high fidelity audio.

https://twitter.com/jdeshetler/status/1489070514530238470

Online LouScheffer

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2. NROL-87 MECO was at 1680m/s, compared to CSG-2 at 1660m/s. This extra velocity lead to increased 'hang time', apogee, and elapsed time to RTLS.
The main cause of the extra hang time appears to be a more lofted trajectory, not the difference in cutoff speed.  There are two pieces of evidence:  First, an extra 20 m/s should result in at most 4 extra seconds of hang time (actually less, since the velocity is not all vertical), but the delta in hang time is much longer.  Second, the angle at cutoff is directly shown by the acceleration during the coast between cutoff and boostback.  This is known to be -1G, directed at the Earth, in both cases.  We don't see -1G, though, since we (SpaceX telemetry) are viewing it from an angle.  NROL-87 shows a value closer to -1, meaning it is closer to pure vertical than CSG-2.

Offline Alexphysics

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5. The SHERPA mission from Vandenberg to SSO required a drone ship landing, and the payload was 4,000kg, so the NROL-87 payload should be somewhat less than 4,000kg.

That mission needed a droneship but not for performance reasons, the droneship was stationed off shore from Vandenberg so it was almost as if it were an RTLS. They just couldn't do an RTLS because of an NRO launch from Delta IV Heavy's pad south of SLC-4E was already on the pad and the NRO asked to move away from an RTLS.

Offline Conexion Espacial

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I publish information in Spanish about space and rockets.
www.x.com/conexionspacial

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