88 Thisbe
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Discovery
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| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | June 15, 1866 |
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Designations
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| Named after | Thisbe |
| Alternate name(s) | |
| Minor planet category |
Main belt |
| Epoch December 31, 2006 (JD 2454100.5) | |
| Aphelion | 482.242 Gm (3.224 AU) |
| Perihelion | 345.809 Gm (2.312 AU) |
| Semi-major axis | 414.025 Gm (2.768 AU) |
| Eccentricity | 0.165 |
| Orbital period | 1681.709 d (4.60 a) |
| Average orbital speed | 17.78 km/s |
| Mean anomaly | 165.454° |
| Inclination | 5.219° |
| Longitude of ascending node | 276.765° |
| Argument of perihelion | 36.591° |
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Physical characteristics
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| Dimensions | 221×201×168 km[2] 195 km (mean) 232 km (Dunham)[1] |
| Mass | 1.05×1019 kg[2] 1.5×1019 kg[3][4] |
| Mean density | 2.70±0.50 g/cm³[2] |
| Equatorial surface gravity | 0.0561 m/s² |
| Escape velocity | 0.1061 km/s |
| Rotation period | 6.04 h[1] |
| Albedo | 0.067[1][5] |
| Temperature | ~167 K |
| Spectral type | B[1] |
| Absolute magnitude (H) | 7.04[1] |
88 Thisbe (
/ˈθɪzbiː/ THIZ-bee) is one of the largest main-belt asteroids. It was discovered by C. H. F. Peters on June 15, 1866, and named after Thisbe, heroine of a Roman fable. An occultation of a star by Thisbe was observed on October 7, 1981. Results from the occultation indicate a larger than expected diameter of 232 km.[6]
[edit] Perturbation
Thisbe has been perturbed by asteroid 7 Iris and in 2001 Michalak estimated it to have a mass of 1.5×1019 kg.[3][4] But Iris is strongly perturbed by many minor planets such as 10 Hygiea and 15 Eunomia.[3]
In 2008, Baer estimated Thisbe to have a mass of 1.05×1019 kg.[2]
[edit] References
- ^ a b c d e f "JPL Small-Body Database Browser: 88 Thisbe". 2008-07-04 last obs. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=88. Retrieved 2008-11-06.
- ^ a b c d Jim Baer (2008). "Recent Asteroid Mass Determinations". Personal Website. http://home.earthlink.net/~jimbaer1/astmass.txt. Retrieved 2008-12-06.
- ^ a b c Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics 374 (2): 703–711. Bibcode 2001A&A...374..703M. doi:10.1051/0004-6361:20010731. http://www.aanda.org/index.php?option=article&access=standard&Itemid=129&url=/articles/aa/abs/2001/29/aa10228/aa10228.html. Retrieved 2008-11-06.
- ^ a b (Low mass estimate of Thisbe 0.074 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.469E+19
- ^ Asteroid Data Sets
- ^ Observed minor planet occultation events, version of 2005 July 26
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