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 21 мин. назад

The #AtlasV vehicle and #NROL42 spacecraft are stable @NatReconOfc

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ULA‏Подлинная учетная запись @ulalaunch 21 мин. назад

#AtlasV #NROL42 launch is scheduled for no earlier than Sept 23.

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Spaceflight Now‏ @SpaceflightNow 29 мин. назад

Tonight's Atlas 5 launch of #NROL42 spy satellite is being postponed by a technical issue. Now targeting Saturday. https://spaceflightnow.com/2017/09/19/av072_journal/ ...

Updated: 09/22/2017 02:19

DELAY. Tonight's Atlas 5 launch of a classified spy satellite is being postponed by a technical issue.

"The ULA Atlas 5 rocket carrying the NROL-42 mission for the National Reconnaissance Office has been delayed. The delay allows the team time to replace a faulty battery on the Atlas 5 booster. The vehicle and spacecraft remain stable. Launch of the NROL-42 mission is scheduled for no earlier than Saturday, Sept. 23, 2017," United Launch Alliance said in a statement.

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30th Space Wing (Vandenberg Air Force Base, Calif.)

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ATLAS LAUNCH DELAYED -
 The launch of a United Launch Alliance Atlas V carrying a National Reconnaissance Office payload is postponed. The launch will be rescheduled no earlier than Saturday, Sep. 23 from Space Launch Complex-3 at Vandenberg Air Force Base.

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NRO‏Подлинная учетная запись @NatReconOfc 3 мин. назад

Tonight's launch of #NROL42 is delayed. We look forward to launching soon. Stay tuned for updates. #AtlasV @ulalaunch

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http://spaceflight101.com/atlas-v-nrol-42/atlas-v-nrol-42-launch-preview/

UPDATE: The launch of a United Launch Alliance Atlas V rocket carrying the classified NROL-42 satellite for the U.S. National Reconnaissance Office was delayed from Thursday night due to an issue with the Atlas V booster, ULA confirmed in a statement:

"The ULA Atlas V rocket carrying the NROL-42 mission for the National Reconnaissance Office has been delayed. The delay allows the team time to replace a faulty battery on the Atlas V booster. The vehicle and spacecraft remain stable. Launch of the NROL-42 mission is scheduled for no earlier than Saturday, Sept. 23, 2017."

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http://www.vandenberg.af.mil/News/Article-Display/Article/1320572/atlas-launch-delayed/

ATLAS LAUNCH DELAYED
30th Space Wing Public Affairs / Published September 21, 2017

VANDENBERG AIR FORCE BASE, Calif. --
The launch of a United Launch Alliance Atlas V carrying a National Reconnaissance Office payload is postponed. The launch will be rescheduled no earlier than Saturday, Sep. 23 from Space Launch Complex-3 at Vandenberg Air Force Base.

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Chris G - NSF‏ @CwG_NSF 3 мин. назад

Missed this earlier. Tonight's Atlas V launch from Vandenberg has been delayed to NET Saturday @ 22:38 PDT because of a battery issue.

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http://www.ulalaunch.com/atlas-v-to-launch-nrol42.aspx

(Sept. 21, 2017, 4:15 p.m. PDT) The ULA Atlas V rocket launch carrying the NROL-42 mission for the National Reconnaissance Office has been delayed. The delay allows the team time to replace a faulty battery on the Atlas V booster. The vehicle and spacecraft remain stable. Launch of the NROL-42 mission is scheduled for no earlier than Saturday, Sept. 23, 2017.

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Chris B - NSF‏ @NASASpaceflight 11 мин. назад

ULA: The battery replacement on the Atlas V (NROL-42) is on track to support Saturday's launch. Philip Sloss (NSF) photo from yesterday.

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ULA‏Подлинная учетная запись @ulalaunch 7 мин назад

The #AtlasV #NROL42 launch is confirmed on the Western Range for Sat, Sept. 23. Launch is planned for 10:30pmPT, http://bit.ly/av_nrol42 

http://www.ulalaunch.com/atlas-v-to-launch-nrol42.aspx

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[/li]
• Launch Date: Saturday, Sept. 23, 2017
• Launch Time: 10:30 p.m. PDT
• Live Broadcast: Tune in to watch beginning at 10:10 p.m. PDT
  

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ULA‏Подлинная учетная запись @ulalaunch 13 мин. назад

#AtlasV battery replacement is on schedule and the ULA and #NROL42 customer teams are ready to support the Sept. 23 launch. @NatReconOfc

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NROL-42 / Atlas 541 setup ... - Vandenberg, AFB, CA, SLC-3E, 9 photos

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09/22/2017 21:49

A United Launch Alliance Atlas 5 rocket is targeting to fly Saturday night from Vandenberg Air Force Base in California to place a classified surveillance satellite into space for the U.S. National Reconnaissance Office.

"The battery replacement is on schedule and the ULA and customer teams are ready to support this new launch date," ULA said in a statement today.

Liftoff is scheduled for 10:30 p.m. local time (1:30 a.m. EDT; 0530 GMT on Sunday morning).

Weather forecasters predict an 80 percent chance of allowable liftoff conditions.

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Spaceflight Now‏ @SpaceflightNow 39 мин. назад

We've updated our #NROL42 fact sheet to reflect a Saturday night launch of the Atlas 5 from Vandenberg AFB, CA https://spaceflightnow.com/2017/09/16/fact-sheet-atlas-5-rocket-to-launch-the-nrol-42-mission-from-vandenberg/ ...

https://spaceflightnow.com/2017/09/16/fact-sheet-atlas-5-rocket-to-launch-the-nrol-42-mission-from-vandenberg/

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Launch Date:           Saturday,  Sept. 23, 2017

Target
Launch Time:       10:30 p.m. local
      1:30 a.m. EDT on Sept. 24
      0530 GMT on Sept. 24
...

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AF SMC‏ @AF_SMC 3 ч. назад

NROL-42 is confirmed on the Western Range for Sat., Sept. 23. Launch window opens at 10:30 p.m. PDT.

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http://www.vandenberg.af.mil/News/Article-Display/Article/1322127/atlas-launch-rescheduled-for-saturday/

ATLAS LAUNCH RESCHEDULED FOR SATURDAY
By 30th Space Wing Public Affairs, 30th Space Wing Public Affairs / Published September 22, 2017

VANDENBERG AIR FORCE BASE, Calif. -- The launch of a United Launch Alliance Atlas V carrying a National Reconnaissance Office payload is rescheduled for Saturday, Sept. 23, from Space Launch Complex-3 at Vandenberg Air Force Base. The launch time is approximately 10:30 p.m. PDT.

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Spaceflight Now‏ @SpaceflightNow 31 мин. назад

Going into the Atlas 5 #NROL42 countdown tonight, there is an 80% chance of acceptable weather. Fog is only concern https://spaceflightnow.com/2017/09/19/av072_journal/ ...


Updated: 09/23/2017 21:30 Weather is 80% GO

Going into the countdown tonight, there is an 80 percent chance of acceptable weather conditions. Reduced visibility from fog will be the only concern.

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"High pressure will build into the range over the weekend and reinstate calm, stable weather conditions. Throughout the count, winds will be light out of the north-northwest between 5 - 8 knots and skies will be clear. While the marine layer will be mixed out, radiation fog will form and reduce visibility at SLC-3," Air Force meteorologists say.

The launch time conditions are expected to include clear skies, fog in the area, visibility of 1.5 to 2.5 miles, winds from 340 to 010 degrees at 5 to 8 knots, a temperature of 51 to 56 degrees F and max upper level winds will be out of the west-northwest at 65 knots from 34,000 to 36,000 feet.

If the launch slips to Sunday night for some reason, the outlook is 90 percent favorable.

"High pressure will continue to strengthen, keeping weather conditions benign. The marine layer will still be gone, leaving clear skies and patchy radiation fog overnight as winds turn offshore. Temperatures will warm to 53F to 58F at T-0 and surface winds will turn out of the northeast at 5 - 8 knots," forecasters say.

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Chris B - NSF‏ @NASASpaceflight 1 мин. назад

ARTICLE: Atlas V preparing to launch NROL-42 - https://www.nasaspaceflight.com/2017/09/atlas-v-preparing-to-launch-nrol-42/ ... - by William Graham

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Atlas V preparing to launch NROL-42

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Updated: 09/24/2017 00:59 Countdown for today's NROL-42 launch

Clocks are ticking for today's flight by the Atlas 5 rocket from Vandenberg Air Force Base in California to deliver the NROL-42 space payload into orbit for the National Reconnaissance Office.

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As the countdown gets started, the launch team will power up the rocket to conduct standard pre-flight tests and ready the vehicle.

Rollback of the mobile service tower from around the rocket is expected in about three hours. Once the gantry is removed, crews at the pad will make preparations to systems and equipment before the site is cleared of all personnel for fueling.

Supercold liquid oxygen begins flowing into the Centaur upper stage a little more than two hours before liftoff, followed by the Atlas first stage. Liquid hydrogen fuel loading for Centaur will be completed a short time later.

A final built-in hold is scheduled when clocks hit the T-minus 4 minute mark. That will give the team a chance to finish any late work and assess the status of the rocket, payload, Range and weather before proceeding into the last moments of the countdown.

Liftoff is targeted for 10:30 p.m. local time (1:30 a.m. EDT; 0530 GMT).

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