Author Topic: Atlas V 541 - NROL-42 - VAFB SLC-3E - Sep 24, 2017 05:50 UTC (Sep 23 2250 PDT)  (Read 40341 times)

Offline abaddon

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That Vandenberg fog really makes for some spectacular shots.  What a beaut!

Online Chris Bergin

Asking for status per if there's a launch tonight or not.
« Last Edit: 09/21/2017 10:05 PM by Chris Bergin »

Online Chris Bergin

Official:

(Vandenberg Air Force Base, Calif., Sept. 21, 2017) 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.

 

Online FutureSpaceTourist

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Selection of photos from Shorealone Films: https://www.flickr.com/photos/[email protected]/

Offline Semmel

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I have not seen it in this thread, but what is the target orbit of this sat? Launching on a Atlas V 541 with the short fairing option would indicate a high density (unlikely) of the sat or a high energy orbit. A GTO orbit doesnt make much sense from VAFB on a Atlas V 541. So is it going into a Tundra orbit with 24 hours period or a Molniya orbit? Is an inclination of 63.4 degrees reachable from VAFB? I am a bit confused to be honest.
« Last Edit: 09/22/2017 09:23 AM by Semmel »

Offline Skyrocket

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I have not seen it in this thread, but what is the target orbit of this sat? Launching on a Atlas V 541 with the short fairing option would indicate a high density (unlikely) of the sat or a high energy orbit. A GTO orbit doesnt make much sense from VAFB on a Atlas V 541. So is it going into a Tundra orbit with 24 hours period or a Molniya orbit? Is an inclination of 63.4 degrees reachable from VAFB? I am a bit confused to be honest.

Molniya orbit - same NOTAMS as NROL-35

Online Chris Bergin

ULA:

(Vandenberg Air Force Base, Calif., Sept. 22, 2017) - The ULA Atlas V rocket carrying the NROL-42 mission for the National Reconnaissance Office is confirmed on the Western Range for Saturday, Sept. 23. The launch time is 10:30 p.m. Pacific. The battery replacement is on schedule and the ULA and customer teams are ready to support this new launch date.

Offline catdlr

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The following is a media update from the United Launch Alliance (ULA). Please direct all questions and comments regarding this update to the ULA.


Subject: Media Update: ULA Atlas V NROL-42 Launch Set for September 23
Date: Sep 22, 2017 4:27 PM

Good afternoon – the ULA Atlas V rocket carrying the NROL-42 mission for the National Reconnaissance Office is confirmed on the Western Range for Saturday, Sept. 23. The launch time is 10:30 p.m. Pacific. The battery replacement is on schedule and the ULA and customer teams are ready to support this new launch date. Today’s L-1 weather forecast continues to show 80% favorable conditions for launch.

Launch Day Forecast
Overall probability of violating weather constraints: 20%
Areas of concern: Launch Visibility

Overall probability of violating weather constraints for 24 Hour Delay: 10%
Areas of concern: Launch Visibility

Launch Broadcast Satellite Coordinates + Webcast

LAUNCH – SEPTEMBER 23, 2017
BARS AND TONE – 9:39 P.M.
PROGRAM START – 10:10 P.M.

TRANSMISSION FOR DIGITAL HIGH DEFINITON
SATELLITE: SES 3
TRANSPONDER: 24
BAND: C-Band Digital
ORBITAL POSITION: 103 degrees west
HD BANDWIDTH: 18 MHz (Half Transponder ‘CD’)
UPLINK FREQ: 6,414.000 MHz (Horizontal)
DOWNLINK FREQ: 4,189.000 MHz (Vertical)
SYMBOL RATE: 13
FEC: Ύ
DATA RATE: 17.9705
DVBS-QPSK
MPEG-2
AUDIO EMBEDDED

WEB CAST AVAILABLE AT: http://www.ulalaunch.com   and www.youtube.com/unitedlaunchalliance
Tony De La Rosa

Online Chris Bergin

William Graham's article, and his awesome work on what these spacecraft may be about....

https://www.nasaspaceflight.com/2017/09/atlas-v-preparing-to-launch-nrol-42/

Offline catdlr

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Atlas V NROL-42 Live Launch Broadcast

United Launch Alliance
Scheduled for Sep 23, 2017

Tune in for the live launch broadcast as United Launch Alliance's Atlas V launches the NROL-42 mission for the National Reconnaissance Office.

LAUNCH – SEPTEMBER 23, 2017
BARS AND TONE – 9:39 P.M.
PROGRAM START – 10:10 P.M.

https://www.youtube.com/watch?v=vvr_-_XsAY4?t=001

Tony De La Rosa

Online Chris Bergin

ULA:

On track for #AtlasV #NROL42 at 10:10pmPDT.

So that's moved up 20 mins.

Online Chris Bergin

Or not...
ULA:
Whoops! On track for 10:30pmPDT. Live broadcast starts at 10:10 pmPDT #LiveTweetProbs

Offline hartspace

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 Spaceflight101 LIVE‏ @S101_Live 4m4 minutes ago

L-70 Minutes: All #AtlasV tanks are topping up to flight level. Final preps of the hydraulic system commence at this time in the count.

Offline hartspace

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 Spaceflight101 LIVE‏ @S101_Live 3m3 minutes ago

Inside one hour to launch. #AtlasV stands fully fueled atop its SLC-3E launch pad, weather is GO and countdown is on track. #NROL42

Offline hartspace

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 ULA‏Verified account @ulalaunch 32s33 seconds ago

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

Offline hartspace

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 ULA‏Verified account @ulalaunch 2m2 minutes ago

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


Offline Steven Pietrobon

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Waiting on ULA to start their webcast.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Colour check.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Webcast beginning soon.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

Offline Steven Pietrobon

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Fuelled and ready to launch.
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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