Author Topic: Atlas V 551 - AFSPC-11 - April 14, 2018  (Read 24937 times)

Online FutureSpaceTourist

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #40 on: 04/12/2018 10:36 PM »
Quote
Watch live as ULAís #AtlasV rocket launches the AFSPC-11 mission for the @USAirForce. Liftoff is planned for 7:13pmET on April 14; Watch live beginning at 6:53pmET. http://bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984549235117969408

Oops, the tweeted pic (attached) says March not April ...

Offline GWH

Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #41 on: 04/12/2018 10:51 PM »


I love it.


For those not familiar with This is Spinal Tap:
« Last Edit: 04/12/2018 10:53 PM by GWH »

Online jcm

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #42 on: 04/13/2018 02:38 AM »
We also don't know much about the subsatellite MYCROFT. The upper case name implies it's
an acronym. Seems likely that the OFT is Orbital Flight Test.  Anyone want to guess the MYCR? :-)

Itís also the name of Sherlock Holmes smarter elder brother.

I do actually know that! But nevertheless I bet you it is an abbreviation for something. Multi Year Communications Relay? Medium Yield Co-orbital Rendezvous? Manuevering Yellow Close Revisit? I'm having problems with the Y
as you can tell.
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Online catdlr

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #43 on: 04/13/2018 02:55 AM »
Atlas V AFSPC-11 Mission Profile

United Launch Alliance
Published on Apr 12, 2018

A United Launch Alliance (ULA) Atlas V 551 rocket will launch the AFSPC-11 mission for the U.S. Air Force.

https://www.youtube.com/watch?v=mFbD3bOyNso?t=001

Tony De La Rosa

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #44 on: 04/13/2018 06:57 AM »
Quote
The ULA Launch Readiness Review was completed earlier today, and we're on track to launch the AFSPC-11 mission for the @usairforce on April 14.  What to expect after liftoff.

https://twitter.com/ulalaunch/status/984583923085656064

(Tweet has mission profile video attached.)

Online Steven Pietrobon

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #45 on: 04/13/2018 07:56 AM »
Geosynchronous is 42,164.2 km semi major axis, which is 22,766.8 nmi (or 26,199.6 mi), while the given number is 24,498.1 nmi. That's a pretty big typo! Orbital period is 26.72 hours compared to 23.93 hours for GEO.
Probably 22,498 for delivery into a drift orbit.

We have the time from first ignition to apogee is T=18,708.8 seconds (5h11m18.8s). We have the time from perigee to apogee as, where sma is the semi major axis and mu is Earth's constant

T = pi*sqrt(sma≥/mu)

This gives sma = 24,179 km. Assuming hp=185 km and

sma = R+(hp+ha)/2

where R is the Earth's radius and ha is apogee, we have the apogee as ha = 35,417 km, close to geosynchronous! So it definitely is a typo. :-) Circular sma = 22,498 nmi is 35,288 km altitude.
« Last Edit: 04/13/2018 07:56 AM by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline satwatcher

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #46 on: 04/13/2018 10:32 AM »
The geostationary circularization burn will happen over Asia and Australia. Unfortunately this happens during daytime so the burn and fuel dump will likely go unnoticed.
« Last Edit: 04/13/2018 03:48 PM by satwatcher »

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #47 on: 04/13/2018 12:49 PM »
L-1 launch weather forecast is unchanged still 80% GO (20% if 24 hr delay):

Quote
Launch day overall probability of violating weather constraints: 20%
Primary concern(s):  Cumulus Clouds
 
24-hour delay overall probability of violating weather constraints: 80%
Primary concern(s): Lightning, Cumulus Clouds, Ground Winds

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #48 on: 04/13/2018 03:24 PM »
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🎵 Rollin rollin rollin. #AtlasV is rollin. See that rocket rollin, letís go! 🎶 @AFSpace @AF_SMC  @usairforce

https://twitter.com/ulalaunch/status/984801458267631616

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #49 on: 04/13/2018 05:46 PM »
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Mighty Atlas has successfully rolled to the pad. #AFSPC11

https://twitter.com/torybruno/status/984831533285425153

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #50 on: 04/13/2018 07:29 PM »
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Update: Launch window for #AtlasV #AFSPC11 now runs from 1913 to 2111 ET (2313 to 0111 UTC).

https://twitter.com/emrekelly/status/984875440065142785

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #51 on: 04/13/2018 08:29 PM »
We also don't know much about the subsatellite MYCROFT. The upper case name implies it's
an acronym. Seems likely that the OFT is Orbital Flight Test.  Anyone want to guess the MYCR? :-)

Itís also the name of Sherlock Holmes smarter elder brother.

I do actually know that! But nevertheless I bet you it is an abbreviation for something. Multi Year Communications Relay? Medium Yield Co-orbital Rendezvous? Manuevering Yellow Close Revisit? I'm having problems with the Y
as you can tell.

OK - I am told apparently it is not an acronym and - I would argue - should not have been in upper case.
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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #52 on: 04/13/2018 10:47 PM »
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RP1 tanking complete. Pgo holding at 80%. #AFSPC11

https://twitter.com/torybruno/status/984921473394470912

Quote
We do RP1 the day before to get it out of the way since itís not cryogenic

https://twitter.com/torybruno/status/984925604284776448

Offline russianhalo117

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #53 on: 04/14/2018 07:20 AM »
We also don't know much about the subsatellite MYCROFT. The upper case name implies it's
an acronym. Seems likely that the OFT is Orbital Flight Test.  Anyone want to guess the MYCR? :-)

Itís also the name of Sherlock Holmes smarter elder brother.

I do actually know that! But nevertheless I bet you it is an abbreviation for something. Multi Year Communications Relay? Medium Yield Co-orbital Rendezvous? Manuevering Yellow Close Revisit? I'm having problems with the Y
as you can tell.
A small Hint: OATK and USAF list MYCROFT as Mycroft unlike ANGELS which is upper case because every letter stands for something. You are analyzing it wrong.

Offline Chris Bergin

Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #54 on: 04/14/2018 02:58 PM »
Moved for live coverage.

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #55 on: 04/14/2018 02:59 PM »
Images released by ULA

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #56 on: 04/14/2018 03:05 PM »


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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #58 on: 04/14/2018 09:02 PM »
Quote
The ULA team has given the "Go!" to begin cryogenic fueling operations as we prepare to launch the AFSPC-11 for the @USAirForce aboard ULA's #AtlasV rocket. Launch is planned for 7:13 p.m. EDT, and the live broadcast begins at 6:53pmEDT bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/985261346261479425

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #59 on: 04/14/2018 09:53 PM »
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Booster LO2 tanking underway.  Centaur LO2 at 90%.  #AFSPC11

https://twitter.com/torybruno/status/985273489824231424

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