NROL-42 (SBIRS HEO-4) – Atlas V 541 (AV-072) – Ванденберг SLC-3E – 24.09.2017, 05:49 UTC

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ULA‏Подлинная учетная запись @ulalaunch 49 сек. назад

Cryogenic fuels in the #AtlasV booster and Centaur upper stage are at flight level. #NROL42

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ULA‏Подлинная учетная запись @ulalaunch 1 мин. назад

The #AtlasV #NROL42 countdown has just entered a 30-minute hold. This is the second and final hold in today's countdown.

Spaceflight Now‏ @SpaceflightNow 2 мин. назад

T-minus 4 minutes and holding. Count in 30-min hold. Still targeting 10:30pmLocal (1:30amEDT; 0530 GMT) liftoff https://spaceflightnow.com/2017/09/19/av072_journal/ ...

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НАПОМИНАНИЕ

William Harwood‏ @cbs_spacenews 2 мин. назад

A5/NROL42: Because the payload is classified, ULA launch commentary will end shortly after payload fairing separation

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Spaceflight Now‏ @SpaceflightNow 1 мин. назад

Weather is observed and forecast GO for launch of the Atlas 5 rocket from Vandenberg tonight #NROL42 https://spaceflightnow.com/2017/09/19/av072_journal/ ...

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09/24/2017 08:00 Weather is GO

Weather is observed GO and forecast GO for launch.
There is a 100 percent chance of acceptable conditions for tonight's launch with no areas of concern.

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Tory Bruno‏Подлинная учетная запись @torybruno 2 мин. назад

The board is green. No significant issues being worked.

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Spaceflight101 LIVE‏ @S101_Live 37 сек. назад

#NROL42 should be in its final reconfigurations at this point, switching to battery power for the climb into orbit.

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09/24/2017 08:10 L-minus 20 minutes

Here's a look at some stats about today's mission. This will be: 

Спойлер

- The 655th launch for Atlas program since 1957
- The 298th Atlas launch from Vandenberg AFB since 1959
- The 244th mission of a Centaur upper stage
- The 221st use of Centaur by an Atlas rocket
- The 482nd production RL10 engine to be launched
- The 21st RL10C-1 engine launched
- The 79th flight of an RD-180 main engine
- The 90-91-92-93rd AJ-60 solid rocket booster flown
- The 73rd launch of an Atlas 5 since 2002
- The 15th National Reconnaissance Office use of Atlas 5
- The 5th Atlas 5 launch of 2017
- The 108th Evolved Expendable Launch Vehicle flight
- The 25th EELV flight for National Reconnaissance Office
- The 121st United Launch Alliance flight overall
- The 65th Atlas 5 under United Launch Alliance
- The 34th United Launch Alliance flight from Vandenberg
- The 25th NRO launch by United Launch Alliance
- The 23rd 500-series flight of the Atlas 5
- The 5th Atlas 5 to fly in the 541 configuration
- The 47th Atlas to use Space Launch Complex 3
- The 14th Atlas 5 launch from Vandenberg AFB since 2008
- The 48th NRO launch since acknowledging flights in 1996
- The 25th acknowledged NRO launch from Vandenberg
- The 3rd NRO launch this year

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ULA‏Подлинная учетная запись @ulalaunch 2 мин. назад

ULA's #AtlasV rocket is fueled and ready to launch the #NROL42 mission for the @NatReconOfc

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ULA‏Подлинная учетная запись @ulalaunch 2 мин.

Today's [url=https://twitter.com/hashtag/NROL42?src=hash]#NROL42 launch time is 10:29:48 pm PDT #AtlasV

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09/24/2017 08:15 L-15 minutes

The countdown continues in this planned hold. Liftoff remains targeted for 10:29:48 p.m. local time (1:29:48 a.m. EDT; 0529:48 GMT) tonight for the 15th National Reconnaissance Office mission using the Atlas 5 launch vehicle and the 9th to occur from Vandenberg Air Force Base.

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ULA‏Подлинная учетная запись @ulalaunch 56 сек. назад

There is a 100% chance of favorable weather for today's launch #NROL42 #AtlasV (Thanks @30thSpaceWing!)

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ULA‏Подлинная учетная запись @ulalaunch 2 мин. назад

T-4 min and holding; getting ready for the poll that gives final "GO" to resume the countdown to #NROL42 launch on a ULA #AtlasV