Transit Research and Attitude Control (TRAAC)

Artist's impression of TRAAC in orbit
Artist’s impression of TRAAC in orbit


Transit Research and Attitude Control

The Transit Research and Attitude Control (TRAAC) satellite was launched by the U. S. Navy from Cape Canaveral along with Transit 4B on November 15, 1961.


The 109 kg satellite was used to test the feasibility of using gravity-gradient stabilization in Transit navigational satellites. It provided information on the effects of radiation from nuclear explosions in space, as it was one of several satellites whose detectors provided data for the Starfish Prime test; ultimately its solar cells were damaged by the radiation and it ceased operation. (It was among several satellites which were inadvertently damaged or destroyed by the Starfish Prime high-altitude nuclear test on July 9, 1962 and subsequent radiation belt.) It is expected to orbit for 800 years at an altitude of about 950 kilometers (590 mi).


The first poem to be launched into orbit about the Earth was inscribed on the instrument panel of TRAAC. Entitled Space Prober and written by Prof. Thomas G. Bergin of Yale University, it reads in part:

And now ’tis man who dares assault the sky…
And as we come to claim our promised place, aim only to repay the good you gave,
And warm with human love the chill of space.


Mission type Technology
Operator United States Navy
Harvard designation 1961 Alpha Eta 2
SATCAT no. 205
Mission duration 270 days
Spacecraft properties
Launch mass 109 kilograms (240 lb)
Start of mission
Launch date November 15, 1961, 22:26 UTC
Rocket Thor DM-21 Ablestar
Launch site Cape Canaveral LC-17B
End of mission
Last contact August 12, 1962
Orbital parameters
Reference system Geocentric
Regime Low Earth
Semi-major axis 7,405.20 kilometers (4,601.38 mi)
Eccentricity 0.0102037
Perigee 958 kilometers (595 mi)
Apogee 1,109 kilometers (689 mi)
Inclination 32.44 degrees
Period 105.8 minutes
Epoch February 7, 2014, 04:46:58 UTC


Post Author: Brightn-n-Fresh

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