Author Topic: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)  (Read 166819 times)

Offline Star One

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #80 on: 09/16/2016 03:23 pm »
Why is this being put into heliocentric orbit rather than being de-orbited?

Offline zubenelgenubi

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #81 on: 09/16/2016 03:35 pm »
Even if one was intentionally targeted, the chance of hitting it w/o a course correction would be nil.
And yes, the end of mission state is analyzed so that planets and moons and things are not affected.
It's still never never land! :)

I think a larger concern is it will show up from time to time in NEO surveys causing much head scratching.

The better it is defined post mission the less likely it will be picked up on a survey. Due to it's high reflectivety it could cause people to panic while they figure out it's just a ULA built Centaur. A Centaur sent in our direction will cause a real panic ;)

That's my understanding, as well: that the concern of the NEO surveyors is not a collision (with Earth, Moon, asteroid, etc.) but with the inert upper stage being mis-identified as a (new-to-human knowledge, natural) NEO on a subsequent opposition/conjunction with Earth.

Thus, jcm's comment that sharing:
the final hyperbolic trajectory parameters are important for them to know.
Then, a precise heliocentric orbit can be computed.  A NEO candidate can be checked against the list of known human artifacts in heliocentric orbit, resulting in a more efficient discovery process!

Ambitious astronomers (amateurs and professionals) with suitable equipment could even document the "flyby"--the "extreme" version of satellite spotting!
« Last Edit: 09/16/2016 03:47 pm by zubenelgenubi »
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Offline RonM

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #82 on: 09/16/2016 03:42 pm »
Why is this being put into heliocentric orbit rather than being de-orbited?

Maybe because it will be in a sun synchronous orbit there might not be an option to de-orbit and guarantee dropping all the debris in the ocean.

Offline Newton_V

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #83 on: 09/16/2016 03:55 pm »
It will be catalogued, just like every other object out there.
BTW,  the C3 will be similar to the Osiris-Rex mission.  I don't know offhand what the DEC and RA are.

Offline Jarnis

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #84 on: 09/16/2016 04:35 pm »
Youtube Stream for the launch is up, webcast starts in 1h 24 minutes.




Online Chris Bergin

Tory Bruno ‏@torybruno  3m3 minutes ago
L- 1 Hr, 51 min.  All looks good Pgo=90%.
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Offline psionedge

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #86 on: 09/16/2016 05:37 pm »
Looks like the team worked through an instrument anomaly:
Quote
‏@torybruno
IMPRESSIVE watching team work thru an anomaly.   Instrmnt failed. Alt msrmnts analized. Flt hist overlaid. Dispo'ed within family & design
https://twitter.com/torybruno/status/776834135910338561

Online Chris Bergin

15 mins to the webcast!
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Offline DaveS

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #89 on: 09/16/2016 06:04 pm »
Tory Bruno ‏@torybruno  2m2 minutes ago
Scrub. Very small ground side LH2 leak. Forming an ice ball on the umbilical.  Outside our history.  Standing down attempt today to resolve.
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Offline HammerD

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #90 on: 09/16/2016 06:06 pm »
Tory Bruno ‏@torybruno  2m2 minutes ago
Scrub. Very small ground side LH2 leak. Forming an ice ball on the umbilical.  Outside our history.  Standing down attempt today to resolve.

Well at least it didn't blow up like the Falcon 9 :-)

Online Chris Bergin

Certainly sounds like 24 hours.
« Last Edit: 09/16/2016 06:09 pm by Chris Bergin »
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Offline kevin-rf

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #92 on: 09/16/2016 06:10 pm »
That moment when your meeting got out at 2:08 and you quickly flip over to NSF and go phew! Tory, better luck the next attempt :)
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Offline DaveS

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #93 on: 09/16/2016 06:11 pm »
ULA ‏@ulalaunch  22s23 seconds ago
Sept16 #AtlasV WorldView-4 mission scrubbed due to minor ground  leak during propellant  tanking. Resched for Sept17 pending resolution #WV4
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Offline zubenelgenubi

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #94 on: 09/16/2016 06:20 pm »
This launch got down and into the T-4 minutes hold, which lasts 30 minutes.

From the ULA web site/Twitter account:
Quote
#AtlasV WorldView-4 launch rescheduled for Sept. 17 pending resolution of the issue. Launch time is 11:30amPT; broadcast at 11:05amPT. #WV4
Rounded off to the minute, that's the same launch time as today = 2:30 pm EDT = 18:30 UTC

According to SFN, the launch weather forecast is 90% favorable tomorrow.

Question: Will the launch window (18:30 - 18:44 UTC) be the same tomorrow?
According to Salo's US launch schedule, Yes.
« Last Edit: 09/16/2016 08:53 pm by zubenelgenubi »
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Offline xcel102

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #95 on: 09/16/2016 11:17 pm »
SFN now says targeting Sunday. Any confirmation yet? I haven't seen update on ULA twitter...

Offline Hunt101

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #96 on: 09/16/2016 11:27 pm »
Yes, Sunday. Need more time to replace a F&D valve. ULA Twitter person punched the clock for the day.

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #97 on: 09/17/2016 12:09 am »
From the ULA Facebook page

UPDATE: The launch of a United Launch Alliance #AtlasV carrying the WorldView-4 satellite is scheduled for Sunday, Sept. 18 to allow the team additional time to evaluate the cause of the ground leak anomaly experienced during propellant tanking. The launch window opens at 11:30 a.m. PDT. Live broadcast to begin at 11:05 a.m. PDT.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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Re: WorldView-4 - Atlas V 401 - November 11, 2016 (18:30 UTC)
« Reply #98 on: 09/17/2016 12:17 am »
And the 30th Space Wing Facebook page

ATLAS LAUNCH RESCHEDULED FOR SUNDAY
VANDENBERG AIR FORCE BASE, Calif. - The launch of a United Launch Alliance Atlas V carrying the WorldView-4 mission is rescheduled for Sunday, Sept. 18, from Space Launch Complex-3 at Vandenberg Air Force Base. The launch time is 11:30 a.m. PDT.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

Online Chris Bergin

45th Space Wing...same thing, but:

FOR IMMEDIATE RELEASE
From: 30th Space Wing Public Affairs, www.vandenberg.af.mil

ATLAS LAUNCH RESCHEDULED FOR SUNDAY

VANDENBERG AIR FORCE BASE, Calif. - The launch of a United Launch Alliance
Atlas V carrying the WorldView-4 mission is rescheduled for Sunday, Sept.
18, from Space Launch Complex-3 at Vandenberg Air Force Base. The launch
time is 11:30 a.m. PDT.
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