Pegasus 2
Encyclopedia
Pegasus 2 or Pegasus II, known before launch as Pegasus B was an American
satellite which was launched in 1965 to study micrometeoroid
impacts in Low Earth orbit
. It was the second of three Pegasus satellites to be launched, following the launch of Pegasus 1
three months earlier. The Pegasus spacecraft were manufactured by Fairchild Hiller, and operated by NASA
.
upper stage of the carrier rocket which had placed it into orbit. It had a total mass of 9058 kilograms (19,969.5 lb), and was equipped with two sets of micrometeoroid detection panels, and a radio for tracking and returning data. The panels were 29 metres (95.1 ft) long, and equipped with 116 individual detectors.
rocket, serial number SA-8, flying from Launch Complex 37B at the Cape Kennedy Air Force Station
. The launch occurred at 07:35:01 UTC on 25 May 1965. Following launch, Pegasus 2 was given the COSPAR designation 1965-039A, whilst NORAD assigned it the Satellite Catalog Number
01381.
Pegasus 2 was a secondary payload on the carrier rocket, which was carrying a boilerplate
Apollo spacecraft
, Apollo 104 or BP-26, as part of a series of configuration tests for the Apollo program. The Apollo boilerplate acted as a payload fairing
for the Pegasus spacecraft, which was stored inside what would have been the Service Module of a functional spacecraft. Upon reaching orbit, the boilerplate Command and Service modules were jettisoned.
of 508 kilometres (274.3 nmi) and an apogee
of 737 kilometres (397.9 nmi), inclined
at 31.7 degrees to the equator and with a period
of 97.15 minutes. Once in orbit, the panels were deployed to detect micrometeoroid impacts. Experiment results were returned to Earth by radio. The spacecraft operated until 29 August 1968, and subsequently remained in orbit until it decayed
and reentered the atmosphere
on 3 November 1979.
United States
The United States of America is a federal constitutional republic comprising fifty states and a federal district...
satellite which was launched in 1965 to study micrometeoroid
Micrometeoroid
A micrometeoroid is a tiny meteoroid; a small particle of rock in space, usually weighing less than a gram. A micrometeor or micrometeorite is such a particle that enters the Earth's atmosphere or falls to Earth.-Scientific interest:...
impacts in Low Earth orbit
Low Earth orbit
A low Earth orbit is generally defined as an orbit within the locus extending from the Earth’s surface up to an altitude of 2,000 km...
. It was the second of three Pegasus satellites to be launched, following the launch of Pegasus 1
Pegasus 1
Pegasus 1 or I, known before launch as Pegasus A, was an American satellite which was launched in 1965 to study micrometeoroid impacts in Low Earth orbit. It was the first of three Pegasus satellites to be launched...
three months earlier. The Pegasus spacecraft were manufactured by Fairchild Hiller, and operated by NASA
NASA
The National Aeronautics and Space Administration is the agency of the United States government that is responsible for the nation's civilian space program and for aeronautics and aerospace research...
.
Spacecraft
Pegasus 2 was a Pegasus spacecraft, consisting of 1450 kilograms (3,196.7 lb) of instruments, attached to the S-IVS-IV
The S-IV was the second stage of the Saturn I, a rocket-powered launch vehicle used by NASA for early flights in the Apollo program.The S-IV was manufactured by the Douglas Aircraft Company and later modified by them to the S-IVB, a similar but distinct stage used on the Saturn IB and Saturn V...
upper stage of the carrier rocket which had placed it into orbit. It had a total mass of 9058 kilograms (19,969.5 lb), and was equipped with two sets of micrometeoroid detection panels, and a radio for tracking and returning data. The panels were 29 metres (95.1 ft) long, and equipped with 116 individual detectors.
Launch
Pegasus 2 was launched atop a Saturn ISaturn I
The Saturn I was the United States' first heavy-lift dedicated space launcher, a rocket designed specifically to launch large payloads into low Earth orbit. Most of the rocket's power came from a clustered lower stage consisting of tanks taken from older rocket designs and strapped together to make...
rocket, serial number SA-8, flying from Launch Complex 37B at the Cape Kennedy Air Force Station
Cape Canaveral Air Force Station
Cape Canaveral Air Force Station is an installation of the United States Air Force Space Command's 45th Space Wing, headquartered at nearby Patrick Air Force Base. Located on Cape Canaveral in the state of Florida, CCAFS is the primary launch head of America's Eastern Range with four launch pads...
. The launch occurred at 07:35:01 UTC on 25 May 1965. Following launch, Pegasus 2 was given the COSPAR designation 1965-039A, whilst NORAD assigned it the Satellite Catalog Number
Satellite Catalog Number
The Satellite Catalog Number is a sequential 5-digit number assigned by USSPACECOM to all Earth orbiting satellites in order of identification. Before USSPACECOM, the catalog was maintained by NORAD...
01381.
Pegasus 2 was a secondary payload on the carrier rocket, which was carrying a boilerplate
Boilerplate (rocketry)
The term boilerplate in rocketry refers to a nonfunctional craft, system, or payload which is used to test various configurations and basic size, load, and handling characteristics. It is far less expensive to build multiple, full-scale, non-functional boilerplate spacecraft than it is to develop...
Apollo spacecraft
Apollo spacecraft
The Apollo spacecraft was composed of five combined parts designed to accomplish the American Apollo program's goal of landing astronauts on the Moon by the end of the 1960s and returning them safely to Earth...
, Apollo 104 or BP-26, as part of a series of configuration tests for the Apollo program. The Apollo boilerplate acted as a payload fairing
Payload fairing
Payload fairing is one of the main components of a launch vehicle. The fairing protects the payload during the ascent against the impact of the atmosphere . More recently, an additional function is to maintain the cleanroom environment for precision instruments.Outside the atmosphere the fairing is...
for the Pegasus spacecraft, which was stored inside what would have been the Service Module of a functional spacecraft. Upon reaching orbit, the boilerplate Command and Service modules were jettisoned.
Operations
Pegasus 2 was operated in a low Earth orbit. On 3 July 1965 it was catalogued as being in an orbit with a perigeeApsis
An apsis , plural apsides , is the point of greatest or least distance of a body from one of the foci of its elliptical orbit. In modern celestial mechanics this focus is also the center of attraction, which is usually the center of mass of the system...
of 508 kilometres (274.3 nmi) and an apogee
Apsis
An apsis , plural apsides , is the point of greatest or least distance of a body from one of the foci of its elliptical orbit. In modern celestial mechanics this focus is also the center of attraction, which is usually the center of mass of the system...
of 737 kilometres (397.9 nmi), inclined
Inclination
Inclination in general is the angle between a reference plane and another plane or axis of direction.-Orbits:The inclination is one of the six orbital parameters describing the shape and orientation of a celestial orbit...
at 31.7 degrees to the equator and with a period
Orbital period
The orbital period is the time taken for a given object to make one complete orbit about another object.When mentioned without further qualification in astronomy this refers to the sidereal period of an astronomical object, which is calculated with respect to the stars.There are several kinds of...
of 97.15 minutes. Once in orbit, the panels were deployed to detect micrometeoroid impacts. Experiment results were returned to Earth by radio. The spacecraft operated until 29 August 1968, and subsequently remained in orbit until it decayed
Orbital decay
Orbital decay is the process of prolonged reduction in the altitude of a satellite's orbit.This can be due to drag produced by an atmosphere due to frequent collisions between the satellite and surrounding air molecules. The drag experienced by the object is larger in the case of increased solar...
and reentered the atmosphere
Atmospheric reentry
Atmospheric entry is the movement of human-made or natural objects as they enter the atmosphere of a celestial body from outer space—in the case of Earth from an altitude above the Kármán Line,...
on 3 November 1979.