88 Thisbe

88 Thisbe

A three-dimensional model of 88 Thisbe based on its light curve.
Discovery
Discovered by Christian Heinrich Friedrich Peters
Discovery date June 15, 1866
Designations
Pronunciation /ˈθɪzb/ THIZ-bee
Named after
Thisbē
Main belt
Adjectives Thisbean
Orbital characteristics[1]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion 482.242 Gm (3.224 AU)
Perihelion 345.809 Gm (2.312 AU)
414.025 Gm (2.768 AU)
Eccentricity 0.165
1681.709 d (4.60 a)
17.78 km/s
165.454°
Inclination 5.219°
276.765°
36.591°
Physical characteristics
Dimensions (255×232×193)±12 km[2]
225 km (mean)
232 km (Dunham)[1]
Mass 1.83×1019 kg[2]
1.5×1019 kg[3][4]
Mean density
3.06±0.52 g/cm³[2]
0.0561 m/s²
0.1061 km/s
6.04[5] h
Albedo 0.067[1][6]
Temperature ~167 K
Spectral type
B[1]
7.04[1]

    88 Thisbe (/ˈθɪzb/ THIZ-bee) is the 13th 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.[7][8]

    During 2000, 88 Thisbe was observed by radar from the Arecibo Observatory. The return signal matched an effective diameter of 207 ± 22 km. This is consistent with the asteroid dimensions computed through other means.[9]

    Photometric observations of this asteroid during 1977 gave a light curve with a period of 6.0422 ± 0.006 hours and a brightness variation of 0.19 in magnitude.[5]

    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] In 2011 Baer revised this to 1.83×1019 kg with an uncertainty of 1.09×1018 kg.[2]

    References

    1. 1 2 3 4 5 Yeomans, Donald K., "88 Thisbe", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 2013-03-25.
    2. 1 2 3 4 5 Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Retrieved 2012-04-12.
    3. 1 2 3 Michalak, G. (2001). "Determination of asteroid masses". Astronomy & Astrophysics 374 (2): 703–711. Bibcode:2001A&A...374..703M. doi:10.1051/0004-6361:20010731. Retrieved 2008-11-06.
    4. 1 2 (Low mass estimate of Thisbe 0.074 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.469E+19
    5. 1 2 Schober, H. J.; et al. (April 1979), "Photoelectric photometry and rotation periods of three large and dark asteroids - 49 Pales, 88 Thisbe and 92 Undina", Astronomy and Astrophysics Supplement Series 36, pp. 1–8, Bibcode:1979A&AS...36....1S.
    6. Asteroid Data Sets
    7. Taylor, G. E., "Progress in accurate determinations of diameters of minor planets", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, June 20–22, 1983, pp. 107–109, Bibcode:1983acm..proc..107T.
    8. Observed minor planet occultation events, version of 2005 July 26
    9. Magri, Christopher; et al. (January 2007), "A radar survey of main-belt asteroids: Arecibo observations of 55 objects during 1999–2003", Icarus 186 (1): 126–151, Bibcode:2007Icar..186..126M, doi:10.1016/j.icarus.2006.08.018

    External links

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