 | |
| Discovery[1] | |
|---|---|
| Discovered by | Christian Heinrich Friedrich Peters |
| Discovery date | 3 June 1875 |
| Designations | |
| (145) Adeona | |
| Pronunciation | /ædiːˈoʊnə/[2] |
Named after | Adeōna[3] |
| main-belt[4] · Adeona | |
| Adjectives | Adeonian |
| Orbital characteristics[5][4] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 130.60 yr (47700 d) |
| Aphelion | 3.05972 AU (457.728 Gm) |
| Perihelion | 2.28737 AU (342.186 Gm) |
| 2.67354 AU (399.956 Gm) | |
| Eccentricity | 0.14444 |
| 4.37yr (1596.7d) | |
| 233.709° | |
| 0° 13m 31.663s / day | |
| Inclination | 12.6337° |
| 77.4206° | |
| 44.0233° | |
| Physical characteristics | |
| 144±3 km[6] 127.783±0.355 km[4] 149.5±5.5 km[7] | |
| Flattening | 0.08[a] |
| Mass | (2.4±0.3)×1018 kg[6] (2.08±0.57)×1018 kg[7] |
Meandensity | 1.52±0.21 g/cm3[6] 1.18±0.34 g/cm3[7] |
Equatorialsurface gravity | 0.0422 m/s2 |
Equatorialescape velocity | 0.0799 km/s |
| 15.071 h (0.6280 d)[4] | |
| 0.048 (calculated)[6] 0.061±0.010[4] 0.0467 ± 0.0116[8] | |
| C (Tholen)[8] | |
| 8.43,[4] 8.050[8] | |
145 Adeona is a largeasteroid from the intermediateasteroid belt, approximately 150 kilometers (93 miles) in diameter. Its surface is very dark,[8] and, based upon its classification as aC-type asteroid, is probably composed of primitivecarbonaceous material. The spectra of the asteroid displays evidence of aqueous alteration.[9] TheAdeona family of asteroids is named after it.
It was discovered byC. H. F. Peters on June 3, 1875, from the observatory atHamilton College,Clinton, New York. Peters named it afterAdeona, theRoman goddess ofhomecoming, because he had recently returned from a journey across the world to observe thetransit of Venus. Peters also discovered144 Vibilia on the same night.[10]
During 2001,Adeona was observed by radar from theArecibo Observatory. The returned signal matched an effective diameter of 151 ± 18 km. This is consistent with the asteroid dimensions computed through other means.[11]
Two stellaroccultations byAdeona have been observed: The first one on July 9, 2002 when it occulted an 11.8mag star, and then again on February 3, 2005 when several observers in Japan recorded the occultation of a 10.4 mag star. The latter was consistent with a diameter of 151 km.[12][13][14]
TheDawn mission team discussed performing a flyby of this object, however NASA decided against it in July 2016.[15] At the time this was considered Dawn was orbiting the large asteroid/dwarf planet1 Ceres, and went on studying that body later that year.[16]Dawn had previously orbited asteroid4 Vesta, before traveling to Ceres.[16]
