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Author Topic:   GPS Satellite IIF-8
jimh posted 10-28-2014 10:31 PM ET (US)   Profile for jimh   Send Email to jimh  
The eighth satellite in the GPS IIF series is scheduled for launch on Wednesday, October 29, 2014 from Cape Canveral, Florida. The launch window begins at 1:21 p.m. EDT. The launch vehicle will again be an Atlas V 401 rocket. This launch will be the fourth GPS satellite launch this year.

The space vehicle is designated SVN-69. The GPS signals will use PRN code 03. The orbit is intended for the E-plane in Slot 1.

If all goes according to plan, the almost 17-year-old SVN-38 (PRN-08) will be removed from the operational constellation of GPS satellites, and several other satellites will move orbits or change status.

The GPS IIF series of satellites are part of the "follow-on" Phase II deployment, for which a total of 12 satellites are planned.

A live webcast should be available from

http://www.ulalaunch.com/

A mission brochure is available from

http://www.ulalaunch.com/uploads/docs/Mission_Booklets/AV/ av_gpsiif8_mob.pdf

The Atlas V uses the Russian made RD-180 main rocket engine, and as noted previously, there is now concern about the reliability of the supply of these engines due to an increase in diplomatic tension between the USA and Russia. For details, see

http://en.wikipedia.org/wiki/RD-180#2014_Availability_Concerns

jimh posted 10-29-2014 06:03 PM ET (US)     Profile for jimh  Send Email to jimh     
All reports indicate a successful launch, and the satellite payload is in orbit and working properly.
jimh posted 10-30-2014 10:02 AM ET (US)     Profile for jimh  Send Email to jimh     
An extremely detailed and comprehensive article summarizes the launch of the GPS IIF-8 satellite at

http://www.nasaspaceflight.com/2014/10/ula-atlas-v-gps-iif-8-launch/

jimh posted 01-16-2015 01:30 PM ET (US)     Profile for jimh  Send Email to jimh     
The eighth GPS satellite in the IIF-series, GPS IIF-8, designated SVN69, and sending PRN code PRN03 was set to usable on December 12, 2014, according to an update under the section RECENT DEVELOPMENTS listed at

http://www.gps.gov/systems/gps/space/

Here is a copy of the official notice:

NOTICE ADVISORY TO NAVSTAR USERS (NANU) 2014090
SUBJ: SVN69 (PRN03) USABLE JDAY 346/2119
1. NANU TYPE: USABINIT
NANU NUMBER: 2014090
NANU DTG: 122108Z DEC 2014
REFERENCE NANU: N/A
REF NANU DTG: N/A
SVN: 69
PRN: 03
START JDAY: 346
START TIME ZULU: 2119
START CALENDAR DATE: 12 DEC 2014
STOP JDAY: N/A
STOP TIME ZULU: N/A
STOP CALENDAR DATE: N/A

2. CONDITION: GPS SATELLITE SVN69 (PRN03) WAS USABLE AS OF JDAY 346
(12 DEC 2014) BEGINNING 2119 ZULU.

3. POC: CIVILIAN - NAVCEN AT 703-313-5900, HTTP://WWW.NAVCEN.USCG.GOV
MILITARY - GPS OPERATIONS CENTER at HTTPS://GPS.AFSPC.AF.MIL/GPSOC, DSN 560-2541,
COMM 719-567-2541, gpsoperationscenter@us.af.mil, HTTPS://GPS.AFSPC.AF.MIL
MILITARY ALTERNATE - JOINT SPACE OPERATIONS CENTER, DSN 276-3514,
COMM 805-606-3514, JSPOCCOMBATOPS@VANDENBERG.AF.MIL

jimh posted 01-17-2015 01:25 PM ET (US)     Profile for jimh  Send Email to jimh     
Here is a satellites-in-view graphic showing the now-operational PRN03 GPS IIF-8 coming over my house yesterday.


By the way, the orbits of the GPS satellites have a orbital period of 0.5-sidereal days. They make two orbits in one sidereal day. That means every 23-hours and 56-minutes they are back in the same position. However, the earth is not, as it takes 24-hours to rotate.

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