88 Thisbe

88 Thisbe
	VLT-SPHERE image of Thisbe
Discovery
Discovered by	Christian Heinrich Friedrich Peters
Discovery date	15 June 1866
Designations
Pronunciation	/ˈθɪzbiː/
Named after	Thisbē
Minor planet category	Main belt
Adjectives	Thisbean /θɪzˈbiːən/, /ˈθɪzbiən/
Orbital characteristics
	Epoch 31 December 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 (sidereal)	1,681.709 d (4.60 yr)
Mean anomaly	165.454°
Inclination	5.219°
Longitude of ascending node	276.765°
Argument of perihelion	36.591°
Physical characteristics
Dimensions	(255×232×193)±12 km
Mean diameter	218±3 km; 225 km; 232 km (Dunham)
Flattening	0.19
Mass	(11.6±2.2)×1018 kg; 18.3×1018 kg; 1.5×1019 kg
Mean density	2.14±0.42 g/cm3; 3.06±0.52 g/cm3
Synodic rotation period	6.04 h
Geometric albedo	0.057; 0.067
Spectral type	B
Absolute magnitude (H)	7.04

88 Thisbe is the 13th largest main-belt asteroid. C. H. F. Peters discovered it on 15 June 1866, named after Thisbe, heroine of a Roman fable. This asteroid orbits the Sun at a distance of 2.768 AU over 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.

On 7 October 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.⁸⁹¹⁰ 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.¹¹

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

Asteroid 7 Iris has perturbed Thisbe; in 2001, Michalak estimated it to have a mass of 15×10¹⁸ kg.⁵^b 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.³ In 2011, Baer revised this to 18.3×10¹⁸ kg with an uncertainty of 1.1×10¹⁸ kg.³

Notes

Flattening derived from the maximum aspect ratio (c/a): $f=1-{\frac {c}{a}}$ , where (c/a) = 0.81±0.07.⁴
(7.4 ± 1.3)×10⁻¹² M_☉ = 1.47×10¹⁹ kg

References

Noah Webster (1884). A Practical Dictionary of the English Language.
Yeomans, Donald K., "88 Thisbe", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 25 March 2013.
Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 12 April 2012.
P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56
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.
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.
Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine
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.
Taylor, G. E., "Progress in accurate determinations of diameters of minor planets", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, 20-22 June 1983, pp. 107–109, Bibcode:1983acm..proc..107T.
Observed minor planet occultation events, version of 2005 July 26
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

88 Thisbe at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
88 Thisbe at the JPL Small-Body Database

[5] Flattening derived from the maximum aspect ratio (c/a): $f=1-{\frac {c}{a}}$ , where (c/a) = 0.81±0.07.⁴

[Thisbemass-7] (7.4 ± 1.3)×10⁻¹² M_☉ = 1.47×10¹⁹ kg

[1] Noah Webster (1884). A Practical Dictionary of the English Language.

[jpldata-2] Yeomans, Donald K., "88 Thisbe", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 25 March 2013.

[Baer-3] Jim Baer (2011). "Recent Asteroid Mass Determinations". Personal Website. Archived from the original on 2 July 2013. Retrieved 12 April 2012.

[VLT-4] P. Vernazza et al. (2021) VLT/SPHERE imaging survey of the largest main-belt asteroids: Final results and synthesis. Astronomy & Astrophysics 54, A56

[Michalak2001-6] 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.

[Schober1979-8] 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.

[9] Asteroid Data Sets Archived 2009-12-17 at the Wayback Machine

[Millis_et_al_1983-10] 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.

[Taylor1983-11] Taylor, G. E., "Progress in accurate determinations of diameters of minor planets", Asteroids, comets, meteors; Proceedings of the Meeting, Uppsala, Sweden, 20-22 June 1983, pp. 107–109, Bibcode:1983acm..proc..107T.

[12] Observed minor planet occultation events, version of 2005 July 26

[icarus186_1_126-13] 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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