 | |
| Discovery | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | 15 June 1866 |
| Designations | |
| (88) Thisbe | |
| Pronunciation | /ˈθɪzbiː/[1] |
Named after | Thisbē |
| Main belt | |
| Adjectives | Thisbean/θɪzˈbiːən/,/ˈθɪzbiən/ |
| Orbital characteristics[2] | |
| Epoch 31 December 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 |
| 1,681.709 d (4.60 yr) | |
| 165.454° | |
| Inclination | 5.219° |
| 276.765° | |
| 36.591° | |
| Physical characteristics | |
| Dimensions | (255×232×193)±12 km[3] |
| 218±3 km[4] 225 km[3] 232 km (Dunham)[2] | |
| Flattening | 0.19[a] |
| Mass | (11.6±2.2)×1018 kg[4] 18.3×1018 kg[3] 1.5×1019 kg[5][b] |
Meandensity | 2.14±0.42 g/cm3[4] 3.06±0.52 g/cm3[3] |
| 6.04[6] h | |
| 0.057[4] 0.067[7] | |
| B[2] | |
| 7.04[2] | |
88 Thisbe is the13th largestmain-beltasteroid.C. H. F. Peters discovered it on 15 June 1866, named afterThisbe, heroine of aRomanfable. This asteroid orbits the Sun at a distance of 2.768 AU over aperiod of 4.60 years and anorbital eccentricity (ovalness) of 0.165. Theorbital plane is inclined at an angle of 5.219° to theecliptic.
On 7 October 1981, asteroid 88 Thisbe was observed tooccult the 9th-magnitude star SAO 187124 from 12 sites. The timing of the different chords across the asteroid provided a diameter estimate of232±12 km. This is 10% larger than the diameter estimate based on radiometric techniques.[8][9][10] During 2000, 88 Thisbe was observed by radar from theArecibo 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 alight curve with a period of 6.0422 ± 0.006 hours and a brightness variation of 0.19 inmagnitude.[6]
Asteroid7 Iris hasperturbed 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 as10 Hygiea and15 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]
