88 Thisbe

Thisbe, minor planet designation 88 Thisbe, 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.[8][9]

88 Thisbe
A three-dimensional model of 88 Thisbe based on its light curve.
Discovery
Discovered byChristian Heinrich Friedrich Peters
Discovery dateJune 15, 1866
Designations
(88) Thisbe
Pronunciation/ˈθɪzbiː/[1]
Named after
Thisbē
Main belt
AdjectivesThisbean /θɪzˈbiːən/, /ˈθɪzbiən/
Orbital characteristics[2]
Epoch December 31, 2006 (JD 2454100.5)
Aphelion482.242 Gm (3.224 AU)
Perihelion345.809 Gm (2.312 AU)
414.025 Gm (2.768 AU)
Eccentricity0.165
1681.709 d (4.60 a)
165.454°
Inclination5.219°
276.765°
36.591°
Physical characteristics
Dimensions(255×232×193)±12 km[3]
225 km (mean)
232 km(Dunham)[2]
Mass1.83×1019 kg[3]
1.5×1019 kg[4][5]
Mean density
3.06±0.52 g/cm³[3]
6.04[6] h
0.067[2][7]
B [2]
7.04[2]

    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.[10]

    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.[6]

    Perturbation

    Thisbe has been perturbed by asteroid 7 Iris and in 2001 Michalak estimated it to have a mass of 1.5×1019 kg.[4][5] But Iris is strongly perturbed by many minor planets such as 10 Hygiea and 15 Eunomia.[4]

    In 2008, Baer estimated Thisbe to have a mass of 1.05×1019 kg.[3] In 2011 Baer revised this to 1.83×1019 kg with an uncertainty of 1.09×1018 kg.[3]

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    References
    1. Noah Webster (1884) A Practical Dictionary of the English Language
    2. Yeomans, Donald K., "88 Thisbe", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 25 March 2013.
    3. Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 12 April 2012.
    4. 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 6 November 2008.
    5. (Low mass estimate of Thisbe 0.074 / Mass of Ceres 4.75) * Mass of Ceres 9.43E+20 = 1.469E+19
    6. 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.
    7. Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
    8. 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.
    9. Observed minor planet occultation events, version of 2005 July 26
    10. 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

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