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TRACE information


Transition Region and Coronal Explorer
Transition Region and Coronal Explorer satellite
NamesExplorer-73
SMEX-4
TRACE
Mission typeHeliophysics
OperatorNASA / GSFC
COSPAR ID1998-020A Edit this at Wikidata
SATCAT no.25280
WebsiteTRACE
Mission duration1 year (planned)
12 years, 2 months and 19 days (achieved) [1]
Spacecraft properties
SpacecraftExplorer LXXIII
Spacecraft typeTransition Region and Coronal Explorer
BusTRACE
ManufacturerGoddard Space Flight Center
Launch mass250 kg (550 lb)
Dimensions1.9 × 1.1 m (6 ft 3 in × 3 ft 7 in)
Power220 watts
Start of mission
Launch date2 April 1998, 02:42:39 UTC
RocketPegasus XL (F21)
Launch siteVandenberg, Stargazer
ContractorOrbital Sciences Corporation
Entered service20 April 1998
End of mission
Deactivated21 June 2010, 23:56 UTC
Last contact21 June 2010
Orbital parameters
Reference systemGeocentric orbit[2]
RegimeSun-synchronous orbit
Perigee altitude520.0 km (323.1 mi)
Apogee altitude547.2 km (340.0 mi)
Inclination97.84°
Period95.48 minutes
Instruments
TRACE Imaging Telescope

TRACE mission patch
SMEX program
← Fast Auroral Snapshot Explorer (Explorer 70) (SMEX-2)
Submillimeter Wave Astronomy Satellite (Explorer 74) (SMEX-3) →
 
Explorer program
← Student Nitric Oxide Explorer (Explorer 72)
Submillimeter Wave Astronomy Satellite (Explorer 74) →

Transition Region and Coronal Explorer (TRACE, or Explorer 73, SMEX-4) was a NASA heliophysics and solar observatory designed to investigate the connections between fine-scale magnetic fields and the associated plasma structures on the Sun by providing high resolution images and observation of the solar photosphere, the transition region, and the solar corona. A main focus of the TRACE instrument is the fine structure of coronal loops low in the solar atmosphere. TRACE is the third spacecraft in the Small Explorer program, launched on 2 April 1998, and obtained its last science image on 21 June 2010, at 23:56 UTC.[3]

  1. ^ "TRACE science mission terminated". Lockheed Martin Solar and Astrophysics Lab. 21 June 2010. Archived from the original on 7 February 2016. Retrieved 13 September 2015.
  2. ^ "Trajectory: TRACE (1998-020A)". NASA. 28 October 2021. Retrieved 29 November 2021. Public Domain This article incorporates text from this source, which is in the public domain.
  3. ^ "Transition Region and Coronal Explorer". Lockheed Martin Solar and Astrophysics Lab.

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