Discovery | |
---|---|
Discovered by | Christian Heinrich Friedrich Peters |
Discovery date | June 15, 1866 |
Designations | |
(88) Thisbe | |
Pronunciation | /ˈθɪzbiː/ [1] |
Named after | Thisbē |
Main belt | |
Adjectives | Thisbean /θɪzˈbiːən/, /ˈθɪzbiən/ |
Orbital characteristics [2] | |
Epoch December 31, 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 | c/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] [a] |
Mean
density | 2.14±0.42 g/cm3
[3] 3.06±0.52 g/cm3 [4] |
6.04 [6] h | |
0.057
[3] 0.067 [7] | |
B [2] | |
7.04 [2] | |
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.
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. [8] [9] [10] 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]
Thisbe has been perturbed by asteroid 7 Iris and in 2001 Michalak estimated it to have a mass of 15×1018 kg. [5] [a] 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]
Discovery | |
---|---|
Discovered by | Christian Heinrich Friedrich Peters |
Discovery date | June 15, 1866 |
Designations | |
(88) Thisbe | |
Pronunciation | /ˈθɪzbiː/ [1] |
Named after | Thisbē |
Main belt | |
Adjectives | Thisbean /θɪzˈbiːən/, /ˈθɪzbiən/ |
Orbital characteristics [2] | |
Epoch December 31, 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 | c/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] [a] |
Mean
density | 2.14±0.42 g/cm3
[3] 3.06±0.52 g/cm3 [4] |
6.04 [6] h | |
0.057
[3] 0.067 [7] | |
B [2] | |
7.04 [2] | |
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.
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. [8] [9] [10] 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]
Thisbe has been perturbed by asteroid 7 Iris and in 2001 Michalak estimated it to have a mass of 15×1018 kg. [5] [a] 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]