Here are details about a :
Space commemorative cover
or Space Cover.
Cosmodromo / Luogo : USA
Data di annullo: 22 Août 1981
Tipo di Evento : Tracking
Rampa di Lancio / Luogo : USA Pasadena (CA)
Missione con Equipaggio / Robotica : Robotica
Obiettivo/Tipo Missione : Spazio Profondo
ou?/where?: au sol - ground
autographe?: non - noneDescrizione : The end of photos of Hyperion moon. The strangest moons ever observed close up. It is one of the smaller moons of Saturn and has a strange, spongy-looking body with dark-floored craters that speckle its surface. The Voyager spacecraft showed it to have a pock-marked body and the largest irregularly shaped satellite ever observed.
Hyperion might have had a major collision which blew part of the moon away. Its eccentric orbit makes it subject to gravitational forces from Saturn which have set it tumbling out of control. The moon`s rotational period is not constant and varies from one orbit to the next. Hyperion is redder than Phoebe and closely matches the color of the dark material on Iapetus. The largest crater on its surface is approximately 120 kilometers (75 miles) in diameter and 10 kilometers (6.2 miles) deep. The irregular shape of Hyperion and evidence of bombardment by meteors makes it appear to be the oldest surface in the Saturn system. Parola chiave :
#Antenna,
#Luna e sonde,
#NASA,
#Pianeta,
#Pietre nel cielo,
#Satellite,
#Sonda,
#Spazio profondo, Questo è FUORI dalle Riviste dello Spazio. Ultima modifica: 29/05/2015 @ 15h22
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Pagina : future · Ref: USA 1552 Avvenimento Spaziale : VOYAGER 2 (OUTER PLANETS PROBE) · SATURN & HER MOONS
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