Author Topic: Atlas V 551 - AFSPC-11 - April 14, 2018  (Read 51400 times)

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #20 on: 04/04/2018 08:48 pm »
Quote
ULA's Atlas V launch of Air Force's AFSPC-11 mission pushed back two days, to April 14, sometime between 4 p.m. and 10:45 p.m. EDT. No explanation offered yet.

https://twitter.com/flatoday_jdean/status/981628567921586178

Offline ethan829

Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #21 on: 04/06/2018 07:26 pm »
Finally some info about the payload!

https://twitter.com/flatoday_jdean/status/982337908395749377
Quote
Air Force/SMC identifies Continuous Broadcast Augmenting SATCOM (CBAS) as primary AFSPC-11 payload launching "mid-April" on Atlas V. In GEO, CBAS to provide communications relay capabilities to support senior leaders, combatant commanders, augmenting existing military satcom.

Offline Newton_V

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #22 on: 04/06/2018 08:50 pm »
Finally some info about the payload!

https://twitter.com/flatoday_jdean/status/982337908395749377
Quote
Air Force/SMC identifies Continuous Broadcast Augmenting SATCOM (CBAS) as primary AFSPC-11 payload launching "mid-April" on Atlas V. In GEO, CBAS to provide communications relay capabilities to support senior leaders, combatant commanders, augmenting existing military satcom.

Sea Bass:
« Last Edit: 04/10/2018 01:40 pm by Newton_V »

Offline input~2

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #23 on: 04/09/2018 04:12 pm »
EASTERN NORTH ATLANTIC.
FLORIDA.
1. HAZARDOUS OPERATIONS, ROCKET LAUNCHING
142200Z TO 150241Z APR, ALTERNATE
152200Z TO 160241Z APR IN AREAS BOUND BY:
A. 28-38N 080-37W, 28-41N 080-32W,
28-37N 078-23W, 28-32N 078-23W,
28-30N 079-10W, 28-31N 080-28W,
28-32N 080-34W, 28-33N 080-35W,
28-36N 080-36W.
B. 28-06N 070-25W, 27-52N 068-22W,
27-42N 068-22W, 27-57N 070-27W.
C. 24-41N 050-24W, 23-45N 046-58W,
23-33N 047-02W, 24-29N 050-28W.
2. CANCEL THIS MSG 160341Z APR 18.//

Authority: EASTERN RANGE 041453Z APR 18.

Date: 090318Z APR 18
Cancel: 16034100 Apr 18

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #24 on: 04/10/2018 08:45 pm »
Launch hazard area and airspace closure area.

Offline Star One

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #25 on: 04/10/2018 08:53 pm »
https://twitter.com/flatoday_jdean/status/983776926065184769?s=20

Quote
James Dean
@flatoday_jdean
45th Space Wing confirms it is still preparing to support Saturday evening launch of AFSPC-11 on Atlas V 551.

Here’s the relevant for an update.

https://twitter.com/flatoday_jdean/status/983794319088930816?s=20

Quote
No specific window released yet but I understand it will open 6-ish p.m.

Offline Targeteer

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #26 on: 04/11/2018 05:15 am »
Here is the full announcement about the payload

http://www.losangeles.af.mil/News/Article-Display/Article/1490064/cbas-space-vehicle-completes-launch-base-testing/

CBAS Space Vehicle Completes Launch Base Testing

/ Published April 10, 2018
AFSPC-11
PHOTO DETAILS  /   DOWNLOAD HI-RES 1 of 1

The launch logo consists of an Atlas V 551 launch vehicle departing Cape Canaveral Air Force Station. The dial is turned to 11 to capture the spirit of the AFSPC-11 government launch team and its mission: maximizing efforts to meet Department of Defense requirements to support our senior leaders and combatant commanders with war-winning space capabilities, on time and on schedule.
4
PRINT | E-MAIL
LOS ANGELES AIR FORCE BASE, Calif. --

CAPE CANAVERAL AIR FORCE STATION, Fla. -- The Continuous Broadcast Augmenting SATCOM, or CBAS, Satellite completed launch base testing March 15 in preparation for the payload’s scheduled launch aboard the AFSPC-11 mission.

The U.S. Air Force is scheduled to launch the CBAS satellite and the Evolved Expendable Launch Vehicle (EELV) Secondary Payload Adapter (ESPA) Augmented Geosynchronous Laboratory Experiment (EAGLE) satellite on the AFSPC-11 mission aboard a United Launch Alliance Atlas V EELV from Space Launch Complex 41, Cape Canaveral Air Force Station, Florida, in mid-April.

 Managed by the Military Satellite Communications Directorate of the U.S. Air Force’s Space and Missile Systems Center, the CBAS Satellite is a military satellite communications spacecraft destined for geosynchronous orbit to provide communications relay capabilities to support our senior leaders and combatant commanders.  The mission of CBAS is to augment existing military satellite communications capabilities and broadcast military data continuously through space-based, satellite communications relay links.

 The Air Force Space Command's Space and Missile Systems Center, located at the Los Angeles Air Force Base, Calif., is the U.S. Air Force's center of excellence for acquiring and developing military space systems.  Its portfolio includes the Global Positioning System, military satellite communications, defense meteorological satellites, space launch and range systems, satellite control networks, space based infrared systems, and space situational awareness capabilities.
Best quote heard during an inspection, "I was unaware that I was the only one who was aware."

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #27 on: 04/11/2018 06:12 am »
Launch weather forecast is 80% GO (but only 30% 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: 70%
Primary concern(s): Lightning, Cumulus Clouds, Ground Winds

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #28 on: 04/11/2018 01:43 pm »
L-3 launch weather forecast is still 80% GO (30% 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: 70%
Primary concern(s): Lightning, Cumulus Clouds, Ground Winds

Attached from: https://twitter.com/_r_ula/status/984060860187504640

Edit: now added source for cast from 45th Space Wing
« Last Edit: 04/11/2018 02:10 pm by FutureSpaceTourist »

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #29 on: 04/11/2018 08:01 pm »
Quote
Heads up launch fans! ULA’s #AtlasV is set to launch AFSPC-11 on April 14. Stay tuned for time and broadcast info. bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984146829288837120

Mission overview attached (I don’t think that’s been posted yet)

Offline jcm

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #30 on: 04/12/2018 03:17 am »
Quote
Heads up launch fans! ULA’s #AtlasV is set to launch AFSPC-11 on April 14. Stay tuned for time and broadcast info. bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984146829288837120

Mission overview attached (I don’t think that’s been posted yet)

Overview says deploy orbit is  circular  equatorial with 24498 naut mi semi major axis. This corresponds to
altitude of 38992 km, 3200 km above GEO. That's rather odd.
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Offline Newton_V

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #31 on: 04/12/2018 03:32 am »
Quote
Heads up launch fans! ULA’s #AtlasV is set to launch AFSPC-11 on April 14. Stay tuned for time and broadcast info. bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984146829288837120

Mission overview attached (I don’t think that’s been posted yet)

Overview says deploy orbit is  circular  equatorial with 24498 naut mi semi major axis. This corresponds to
altitude of 38992 km, 3200 km above GEO. That's rather odd.
I think that's a typo.

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #32 on: 04/12/2018 03:57 am »
Quote
Heads up launch fans! ULA’s #AtlasV is set to launch AFSPC-11 on April 14. Stay tuned for time and broadcast info. bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984146829288837120

Mission overview attached (I don’t think that’s been posted yet)

Overview says deploy orbit is  circular  equatorial with 24498 naut mi semi major axis. This corresponds to
altitude of 38992 km, 3200 km above GEO. That's rather odd.
I think that's a typo.

Probably.

So what do we think the mass of CBAS is? ULA says Atlas 551 carries 3850 kg
to GEO.  Eagle is probably at least 500 kg, and MYCROFT about 100 kg.
So CBAS is at most 3200 kg or so.

Who built it? Orbital? Boeing? Loral?

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #33 on: 04/12/2018 04:10 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? :-)
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Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #34 on: 04/12/2018 06:23 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? :-)

It’s also the name of Sherlock Holmes smarter elder brother.
« Last Edit: 04/12/2018 06:23 am by Star One »

Offline russianhalo117

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #35 on: 04/12/2018 06:58 am »
Quote
Heads up launch fans! ULA’s #AtlasV is set to launch AFSPC-11 on April 14. Stay tuned for time and broadcast info. bit.ly/av_afspc11

https://twitter.com/ulalaunch/status/984146829288837120

Mission overview attached (I don’t think that’s been posted yet)

Overview says deploy orbit is  circular  equatorial with 24498 naut mi semi major axis. This corresponds to
altitude of 38992 km, 3200 km above GEO. That's rather odd.
I think that's a typo.

Probably.

So what do we think the mass of CBAS is? ULA says Atlas 551 carries 3850 kg
to GEO.  Eagle is probably at least 500 kg, and MYCROFT about 100 kg.
So CBAS is at most 3200 kg or so.

Who built it? Orbital? Boeing? Loral?


Some helpful info:
EAGLE:
ESPAStar Platform dry mass according to OATK is 1086 kg Payload (181 kg per Port).

MYCROFT:
ESPASat Bus is 70kg nominal dry mass with 30kg payload capability.
« Last Edit: 04/13/2018 03:11 am by russianhalo117 »

Offline russianhalo117

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #36 on: 04/12/2018 07:02 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? :-)
it is a classified government payload that based on lessons learned from ANGELS. Also note that all other secondary payloads aboard EAGLE are testing additional improvements to the GSSAP mission in addition to other experiments.
« Last Edit: 04/12/2018 07:04 am by russianhalo117 »

Offline Steven Pietrobon

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #37 on: 04/12/2018 09:09 am »
I think that's a typo.

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.
« Last Edit: 04/12/2018 09:26 am by Steven Pietrobon »
Akin's Laws of Spacecraft Design #1:  Engineering is done with numbers.  Analysis without numbers is only an opinion.

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #38 on: 04/12/2018 02:36 pm »
L-2 launch weather forecast is still 80% GO (but down to only 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
« Last Edit: 04/12/2018 02:37 pm by FutureSpaceTourist »

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Re: Atlas V 551 - AFSPC-11 - April 14, 2018
« Reply #39 on: 04/12/2018 04:17 pm »
I think that's a typo.

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.

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