2026-244Latest orbital launch: Falcon 9 · Starlink Group 15-16 · Oct 27, 2026 · VandenbergLaunch record →
sci-techmaventhe history of spaceflight, in data
  1. Home
  2. Spacecraft
  3. Compton Gamma Ray Observatory
// astronomy · 1991

Compton Gamma Ray Observatory

Former NASA space observatory. Compton Gamma Ray Observatory was launched on April 5, 1991 aboard a Space Shuttle from Cape Canaveral & Kennedy. Latest status in GCAT: attached to another object (Apr 7, 1991).

COSPAR 1991-027BNORAD 21225United States

Identity

Name in GCAT
Compton Observatory
Common name
Compton Gamma Ray Observatory
Payload designation
Gamma Ray Observatory
International designator
1991-027B
NORAD catalog number
21225
GCAT identifier
S21225
UN registration
ST/SG/SER.E/258

Mission

Mission type
Astronomy
Use
Civil government
Program
Great Obs
Owner
GSFC
Country
United States
Builder
TRW Inc.
Platform (bus)
GRO

Launch

Date
April 5, 1991 · 14:22 UTC
Launch record
1991-027Success
Spaceport
Cape Canaveral & Kennedy · pad LC39B

Orbit and fate

Orbit class (GCAT)
LLEO/I
Perigee
441 km
Apogee
455 km
Inclination
28.47°
Status
Attached to another object
Status date
April 7, 1991
Last known active
Jun 4, 2000
End of operations
Jun 4, 2000

Size

Mass
15.6 t
Dry mass
13.9 t
Length
7.6 m
Diameter
4.60 m
Span
21.3 m

Source: GCAT payload, deep-space and lander catalogs, Jonathan C. McDowell (CC BY 4.0); Wikidata Q41519 (CC0).