87 Sylvia
Large asteroid with two moons / From Wikipedia, the free encyclopedia
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Sylvia (minor planet designation: 87 Sylvia) is one of the largest asteroids (approximately tied for 7th place, to within measurement uncertainties). It is the parent body of the Sylvia family and member of Cybele group located beyond the main asteroid belt (see minor-planet groups). Sylvia was the first asteroid known to possess more than one moon.
Quick Facts Discovery, Discovered by ...
Discovery | |
---|---|
Discovered by | Norman Robert Pogson |
Discovery date | May 16, 1866 |
Designations | |
(87) Sylvia | |
Pronunciation | /ˈsɪlviə/ SIL-vee-ə[1] |
Named after | Rhea Silvia |
A909 GA | |
main belt · (outside core) Sylvia · Cybele | |
Adjectives | Sylvian (/ˈsɪlviən/ SIL-vee-ən) |
Orbital characteristics[2] | |
Epoch July 01, 2021 (JD 2459396.5, heliocentric) | |
Aphelion | 3.81 AU (560 Gm) |
Perihelion | 3.15 AU (480 Gm) |
3.48 AU (520 Gm) | |
Eccentricity | 0.094 |
6.5 a (2372 d) | |
Average orbital speed | 15.94 km/s[citation needed] |
213° | |
0° 9m 6.48s / day | |
Inclination | 10.9° |
73° | |
263° | |
Known satellites | 2 |
Physical characteristics[3] | |
Dimensions | (363 × 249 × 191) ±5 km (MPCD) or (374 × 248 × 194) ±5 km (ADAM) |
Mean diameter | 271±5 km (MPCD) or 274±5 km (ADAM) |
Volume | (10.5±0.2)×107 km3 (MPCD) or (10.8±0.2)×107 km3 (ADAM) |
Mass | (14.76±0.06)×1018 kg[4] (14.6±0.1)×1018 kg[5] |
Mean density | 1.378±0.045 g/cm3[citation needed] |
0.2160 d (5.183641±0.000039 h) | |
North pole right ascension | 14.3°±5° |
North pole declination | +83.5°±5° |
Pole ecliptic latitude | +64.2°±5° |
Pole ecliptic longitude | 75.3°±5° |
0.0435 [6] | |
X [7] | |
6.94 | |
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