Galaxy 8i

 1997-078A

---

Panamsat's Galaxy 8i is dedicated to Galaxy Latin America (San Jose, Costa Rica) for DirecTV service to Latin America. Launch was by Atlas IIAS in 1997 into a supersynchronous transfer orbit. Mass of the HS-601HP was 3558 kg. Galaxy 8i is the first satellite to use the XIPS Xe ion propulsion system for all attitude control and stationkeeping; earlier flights used it for E/W stationkeeping only. Galaxy 8i carried less fuel than usual, increasing the dry payload mass. It was colocated with Galaxy 3-R at 95E. In Apr 1998 the DirecTV service was transferred from 3-R to 8-i.

In Sep 2000 the XIPS system seized up from contamination and the backup AOCS system was used. 8i was retired from primary service but used as an orbital spare for several years,even occasionally being loaned to NASA.

Galaxy 8i
Date	Time	Event	Orbit
1997 Dec 8	2352	Launch by Atlas 2AS AC-149	CC LC36B
		T+0:54 SRB-3,4 burn
		T+1:09 SRB-1,2 sep
		T+1:57 SRB-3,4 sep
		T+2:44 BECO
		T+2:47 Booster sep
		T+3:30 Fairing sep
		T+4:50 SECO
		T+4:52 Atlas sep
		T+5:09 MES 1
1997 Dec 9
	0001	T+9:42 Centaur MECO-1	160? x 200? x 28.5?
	0016	T+24:36 MES 2
	0018	T+26:15 Centaur MECO-2	157? x 50484 x 27.0
	0021	T+29:01 Centaur sep
1997 Dec 11			938.90 333 x 50434 x 26.70
1997 Dec 13	2130?	LAM-1
1997 Dec 14			1372.30 18703 x 50353 x 5.4
1997 Dec 16	1820?	LAM-2
1997 Dec 16			1698.78 31218 x 50347 x 1.8
1997 Dec 18?		LAM-3
1997 Dec 21?		LAM-4
1997 Dec 21			1520.72 35773 x 39081 x 0.2
1997 Dec 22	1400?	LAM-5
1997 Dec 24			1437.58 35789 x 35842 x 0.1 GEO 79.0W+0.3W
1997 Dec 29			1436.16 35779 x 35796 x 0.0 GEO 79.1W
1998 Jan 27			1436.25 35787 x 35792 x 0.2 GEO 80.1W
1998 Feb 1		move out	1439.15 35786 x 35905 x 0.2 GEO 83.9W+0.7W
1998 Feb 28			1436.16 35781 x 35793 x 0.1 GEO 95.0W
1998 Apr		GLA DirecTV transferred from G3R
1999 Oct 14			1436.12 35782 x 35791 x 0.0 GEO 94.9W
2002 Sep 17			1436.10 35774 x 35798 x 0.0 GEO 95.0W
2003 Jul 6			1436.12 35775 x 35797 x 0.7 GEO 95.0W
2004 Jan 14			1436.12 35767 x 35806 x 1.2 GEO 94.9W

FUSE

 1999-035A

---

The Far Ultraviolet Spectroscopic Explorer was originally the last Delta explorer. It was descoped in the mid 1990s and a revised, smaller spacecraft was built by Orbital/Germantown for JHU. The new FUSE is a MIDEX class mission. The bus is the medium LeoStar bus derived from the Fairchild MMS.

The spacecraft has a mass of 1130 to 1220 kg. Launch vehicle is a Delta 7320-10. Bus mass is 580 kg; instrument mass is 780 kg. Total mass is 1360 kg. The 0.35m telescope has four off-axis parabolas with an effective area of 80 sq cm and 1.5 arcsec resolution. Wavelength range covered is 905-1195A. The satellite is 1.2 x 1.8 x 5.5m in size with about a 6.0m solar panel span.

The effect of FBC was apparent as understaffing meant less prelaunch testing and more small teething troubles on orbit. Initially large slit observations were done as the channel alignment and wavelength calibration were refined. In early 2000 the D/H measurement with the narrow slit was begun.

On 2004 Jun 6, nine debris objects were emitted from FUSE at the time of a sensor door closing in safemode; they were probably pieces of insulation.

FUSE
Date	Time	Event	Orbit
1999 Jun 24	1544:00	Launch by Delta 271	CC LC17A
		T+1:03 SRM burnout
		T+1:06 SRM sep
		T+4:24 MECO
		T+4:37 SES-1
		T+4:58 Fairing sep
	1554	T+10:17 SECO-1	185 x 855 x 28.8
	1652	T+1:08:22 SES-2
	1653	T+1:09:07 SECO-2	100.08 754 x 769 x 25.0
	1700	T+1:16:05 Stage 2 sep
	1714	Stage 2 depletion burn	95.63 182 x 915 x 19.1
1999 Nov		Science operations begin
2001 May 31		Wheel failure 1
2001 Dec 10		Reaction wheel failure (2nd of 4)
2002 Mar 2?		FUSE restored to operation
2003 Jul		Zero gyro mode installed
2004 Jun 6		Safemode, debris objects
2004 Dec 27		Safemode,reaction wheel problem
2005 Nov		Resumed operations
2007 Jul 12		Last reaction wheel fails, end of science ops
2007 Oct 18		Decomissioned

Payload:

• HRS High Resolution Spectrograph