87 Sylvia

87 Sylvia
CMSylvia.png
Adaptive Optics observations of (87) Sylvia, showing its two satellites, Remus and Romulus.
Discovery
Discovered byNorman Robert Pogson
Discovery dateMay 16, 1866
Designations
MPC designation(87) Sylvia
Pronunciationə/ SIL-vee-ə
A909 GA
main belt · (outer)
Sylvia · Cybele
Orbital characteristics
Epoch July 14, 2004 (JD 2453200.5)
Aphelion3.768 AU (563.679 Gm)
Perihelion3.213 AU (480.594 Gm)
3.490 AU (522.137 Gm)
Eccentricity0.080
6.52 a (2381.697 d)
15.94 km/s
352.763°
Inclination10.855°
73.342°
266.195°
Known satellites2
Physical characteristics
Dimensions(384 × 262 × 232) ±10 km[1][2]
(385 × 265 × 230) ± 10 km[3]
286 km (mean)
Mass(1.478 ± 0.006) × 1019 kg[1][3]
Mean density
1.2 ± 0.1 g/cm3[1][3]
Equatorial surface gravity
0.0729 m/s2
Equatorial escape velocity
0.1379 km/s
0.2160 d (5.183642 h) [4][5]
0.0435 [6]
X[7]
6.94

87 Sylvia is the 8th-largest asteroid in the asteroid belt. It is the parent body of the Sylvia family and member of Cybele group located beyond the core of the belt (see minor-planet groups). Sylvia is the first asteroid known to possess more than one moon.

Discovery and naming

Sylvia was discovered by N. R. Pogson on May 16, 1866, from Madras (Chennai), India.[8] A. Paluzie-Borrell, writing in Paul Erget's The Names of the Minor Planets (1955), mistakenly states that the name honours Sylvie Petiaux-Hugo Flammarion, the first wife of astronomer Camille Flammarion. In fact, in the article announcing the discovery of the asteroid, Pogson explained that he selected the name in reference to Rhea Silvia, mother of Romulus and Remus (MNRAS, 1866).

Other Languages
asturianu: 87 Sylvia
Bân-lâm-gú: 87 Sylvia
беларуская: (87) Сільвія
català: (87) Sylvia
Deutsch: (87) Sylvia
Ελληνικά: 87 Σύλβια
español: (87) Sylvia
Esperanto: 87 Sylvia
euskara: 87 Silvia
فارسی: سیلویا ۸۷
français: (87) Sylvia
한국어: 87 실비아
հայերեն: (87) Սիլվիա
italiano: 87 Sylvia
коми: Сильвия
Latina: 87 Sylvia
latviešu: 87 Silvija
Lëtzebuergesch: (87) Sylvia
magyar: 87 Sylvia
norsk: 87 Sylvia
norsk nynorsk: 87 Sylvia
occitan: (87) Sylvia
Plattdüütsch: (87) Sylvia
polski: (87) Sylvia
português: 87 Sylvia
русский: (87) Сильвия
Simple English: 87 Sylvia
slovenčina: 87 Sylvia
slovenščina: 87 Silvija
српски / srpski: 87 Силвија
suomi: 87 Sylvia
svenska: 87 Sylvia
Tagalog: 87 Sylvia
українська: 87 Сільвія
粵語: 林神星
中文: 林神星