87 Sylvia

87 Sylvia
87 Sylvia kuineen
87 Sylvia kuineen
Löytäminen
Löytäjät Norman Robert Pogson
Löytöaika 13. toukokuuta 1866
Kiertoradan ominaisuudet
Keskietäisyys Auringosta 522,137 milj km
3,490 AU
Pienin etäisyys Auringosta 480,594 milj km
3,213 AU
Suurin etäisyys Auringosta 563,679 milj km
3,768 AU
Eksentrisyys 0,080
Kiertoaika Auringon ympäri 2381,697 päivää, 6,52 vuotta
Keskiratanopeus 15,94 km/s
Inklinaatio 10,855
Kuiden lukumäärä 2
Fyysiset ominaisuudet
Läpimitta 385×265×230 ± 10 km
Massa 1,478±0,006×10E19 kg
Putoamiskiihtyvyys pinnalla 0,027 m/s2
Pyörähdysaika 0,2160 d (5,183642 h)
pyörimisnopeus 230 km/h
Akselin kaltevuus 29,1
Albedo 0,0435
Pakonopeus 0,10 km/s
Asteroidiluokka X
Pinnan lämpötila alin: K
keski: ~151 K
ylin: 223 K (–52 °C)

87 Sylvia on Marsin ja Jupiterin välisen asteroidivyöhykkeen yksi suurimmista asteroideista, läpimitaltaan 280 ja pituudeltaan 380 kilometriä[1]. Se kuuluu Cybele-ryhmään. Sylvia kiertää itsensä ympäri 5 tunnissa ja 11 minuutissa[1]. Sylvialta on löydetty kaksi kuuta, Romulus ja Remus.[2]

Sylvian kuut

Sylvian Romulus on läpimitaltaan 18 kilometriä ja kiertää Sylviaa 3,6496±0,0007 päivän eli 87,6 tunnin kiertoajalla. Remuksen läpimitta on noin 7 km ja yksi kierros vie 1,3788±0,0007 päivää eli 33 tuntia.[1]

Lähteet

  1. ↑ a b c Robert Roy Britt: First Asteroid Trio Discovered Space.com. 10.8.2005. TechMediaNetwork. Viitattu 21.10.2012. (englanniksi)
  2. ↑ (87) Sylvia, Romulus, and Remus Johnston. Viitattu 29.3.2013. (englanniksi)

Aiheesta muualla

Taiteilijan näkemys Sylviasta ja sen kuista Romuluksesta ja Remuksesta.
Sylvian kuiden radat ja suurennos Sylviasta
Edeltäjä:
86 Semele 		Luettelo pikkuplaneetoista Seuraaja:
88 Thisbe

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