 A 3D lightcurve model of 91 Aegina | |
| Discovery | |
|---|---|
| Discovered by | Édouard Stephan |
| Discovery date | 4 November 1866 |
| Designations | |
| (91) Aegina | |
| Pronunciation | /ɪˈdʒaɪnə/[1] |
Named after | Aegina |
| Main belt | |
| Adjectives | Aeginetan/iːdʒɪˈniːtən/[2] |
| Orbital characteristics | |
| Epoch 31 December 2006 (JD 2454100.5) | |
| Aphelion | 428.453 Gm (2.864 AU) |
| Perihelion | 346.826 Gm (2.318 AU) |
| 387.640 Gm (2.591 AU) | |
| Eccentricity | 0.105 |
| 1,523.536 d (4.171 yr) | |
Averageorbital speed | 18.45 km/s |
| 183.458° | |
| Inclination | 2.109° |
| 10.806° | |
| 73.371° | |
| Physical characteristics | |
| Dimensions | 109.8 km |
| Mass | 1.4×1018 kg |
Equatorialsurface gravity | 0.0307 m/s2 |
Equatorialescape velocity | 0.0580 km/s |
| 6.03 hours | |
| 0.043[3] | |
| C | |
| 8.84 | |
91 Aegina (from LatinAegīna,Aegīnēta)[4] is a largemain-beltasteroid. It was discovered byFrenchastronomerÉdouard Jean-Marie Stephan on 4 November 1866. It was his second and final asteroid discovery. The first was89 Julia. The asteroid's name comes fromAegina, aGreek mythological figure associated with theisland of the same name.
This body is orbiting theSun with aperiod of 4.17 years and aneccentricity of 0.105. The orbit of this object brings it to within 4.9 Gm of thedwarf planetCeres, and the resulting gravitational interaction has been used to produce mass estimates of the latter.[5] The cross-section size of the asteroid is 110 km and it has arotation period of six hours. The surface coloring of 91 Aegina is very dark and thisC-type asteroid has probably a primitivecarbonaceous composition. Observation ofabsorption bands atwavelengths of 0.7 and 3 μm indicate the presence of hydrated minerals and/or ice grains on the surface.[6]
_mathilde.jpg) | This article about a C-type asteroid native to theasteroid belt is astub. You can help Wikipedia byexpanding it. |
