88 Thisbe
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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 Template:Cvt over a period of Template:Convert 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 Template:Val. This is 10% larger than the diameter estimate based on radiometric techniques.<ref name=Millis_et_al_1983/><ref name="Taylor1983"/><ref>Observed minor planet occultation events, version of 2005 July 26</ref> 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.<ref name="icarus186_1_126"/>
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.<ref name="Schober1979"/>
Perturbation
Asteroid 7 Iris has perturbed Thisbe; in 2001, Michalak estimated it to have a mass of 15Template:E kg.<ref name=Michalak2001>Template:Cite journal</ref>Template:Efn But Iris is strongly perturbed by many minor planets such as 10 Hygiea and 15 Eunomia.<ref name=Michalak2001/>
In 2008, Baer estimated Thisbe to have a mass of 10.5Template:E kg.<ref name=Baer> Template:Cite web </ref> In 2011, Baer revised this to 18.3Template:E kg with an uncertainty of 1.1Template:E kg.<ref name=Baer/>
Notes
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External links
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