88 Thisbe

Thisbe, minor planet designation 88 Thisbe, is the 13th largest main-belt asteroid. It was discovered by C. H. F. Peters on June 15, 1866, and named after Thisbe, heroine of a Roman fable. This asteroid is orbiting the Sun at a distance of 2.768 AU with a period of 4.60 years and an orbital eccentricity (ovalness) of 0.165. The orbital plane is inclined at an angle of 5.219° to the ecliptic.

88 Thisbe
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
1,681.709 d (4.60 yr)
165.454°
Inclination5.219°
276.765°
36.591°
Physical characteristics
Dimensionsc/a = 0.81±0.07[3]
(255×232×193)±12 km[4]
Mean diameter
218±3 km[3]
225 km[4]
232 km (Dunham)[2]
Mass(11.6±2.2)×1018 kg[3]
18.3×1018 kg[4]
1.5×1019 kg[5][6]
Mean density
2.14±0.42 g/cm3[3]
3.06±0.52 g/cm3[4]
6.04[7] h
0.057[3]
0.067[8]
B [2]
7.04[2]

    On October 7, 1981, asteroid 88 Thisbe was observed to occult the 9th-magnitude star SAO 187124 from 12 sites. The timing of the different chords across the asteroid provided a diameter estimate of 232±12 km. This is 10% larger than the diameter estimate based on radiometric techniques.[9][10][11] 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.[12]

    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.[7]

    Perturbation

    Thisbe has been perturbed by asteroid 7 Iris and in 2001 Michalak estimated it to have a mass of 15×1018 kg.[5][6] But Iris is strongly perturbed by many minor planets such as 10 Hygiea and 15 Eunomia.[5]

    In 2008, Baer estimated Thisbe to have a mass of 10.5×1018 kg.[4] In 2011 Baer revised this to 18.3×1018 kg with an uncertainty of 1.1×1018 kg.[4]

    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. P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
    4. Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 12 April 2012.
    5. 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.
    6. (Low mass estimate of Thisbe 0.074 / Mass of Ceres 4.75) * Mass of Ceres 9.43×1020 = 1.47×1019
    7. 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, vol. 36, pp. 1–8, Bibcode:1979A&AS...36....1S.
    8. Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
    9. Millis, R. L.; et al. (February 1983), "The diameter of 88 THISBE from its occultation of SAO 187124", Astronomical Journal, 88: 229–235, Bibcode:1983AJ.....88..229M, doi:10.1086/113310, hdl:2060/19820025413.
    10. 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.
    11. Observed minor planet occultation events, version of 2005 July 26
    12. 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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