101 Helena: Difference between revisions
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| single_temperature=~173 [[kelvin|K]]}} |
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''There is also a moon called [[Helene (moon)]].'' |
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'''101 Helena''' is a fairly small, rocky [[main-belt]] [[asteroid]]. It was discovered by [[James Craig Watson|J. C. Watson]] on August 15, 1868. It is named after [[Helen of Troy]] in [[Greek mythology]]. |
'''101 Helena''' is a fairly small, rocky [[main-belt]] [[asteroid]]. It was discovered by [[James Craig Watson|J. C. Watson]] on August 15, 1868. It is named after [[Helen of Troy]] in [[Greek mythology]]. |
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Revision as of 00:36, 13 August 2012
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| Discovery | |
|---|---|
| Discovered by | James Craig Watson |
| Discovery date | August 15, 1868 |
| Designations | |
Named after | Helen of Troy |
| Main belt | |
| Orbital characteristics | |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 441.092 Gm (2.949 AU) |
| Perihelion | 331.683 Gm (2.217 AU) |
| 386.387 Gm (2.583 AU) | |
| Eccentricity | 0.142 |
| 1516.159 d (4.15 a) | |
Average orbital speed | 18.44 km/s |
| 125.599° | |
| Inclination | 10.199° |
| 343.471° | |
| 347.818° | |
| Physical characteristics | |
| Dimensions | 65.8 km |
| Mass | 3.0×1017 kg |
Mean density | 2.0 g/cm³ |
| 0.0184 m/s² | |
| 0.0348 km/s | |
| ? d | |
| Albedo | ? |
| Temperature | ~173 K |
Spectral type | S |
| 8.33 | |
101 Helena is a fairly small, rocky main-belt asteroid. It was discovered by J. C. Watson on August 15, 1868. It is named after Helen of Troy in Greek mythology.
_mathilde.jpg){kind=small} | This article about an S-type asteroid native to the asteroid belt is a stub. You can help Wikipedia by expanding it. |