7803 Adachi
Stony Agnia asteroid From Wikipedia, the free encyclopedia
7803 Adachi, provisional designation 1997 EW2, is a stony Agnia asteroid from the middle region of the asteroid belt, approximately 6.4 kilometers (4 miles) in diameter. The asteroid was discovered on 4 March 1997, by Japanese amateur astronomer Takao Kobayashi at the Ōizumi Observatory in central Japan. It was named for Japanese amateur astronomer Makoto Adachi.[1] The S-type asteroid has a rotation period of 5.2 hours.[6]
| Discovery [1] | |
|---|---|
| Discovered by | T. Kobayashi |
| Discovery site | Ōizumi Obs. |
| Discovery date | 4 March 1997 |
| Designations | |
| (7803) Adachi | |
Named after | Makoto Adachi [1] (amateur astronomer) |
| 1997 EW2 · 1973 AA3 1976 UY17 · 1978 EM1 1992 CF2 | |
| main-belt [1][2] · (middle) Agnia [3] | |
| Orbital characteristics [2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.96 yr (23,363 d) |
| Aphelion | 2.9253 AU |
| Perihelion | 2.6459 AU |
| 2.7856 AU | |
| Eccentricity | 0.0502 |
| 4.65 yr (1,698 d) | |
| 239.11° | |
| 0° 12m 43.2s / day | |
| Inclination | 4.9969° |
| 110.63° | |
| 8.8759° | |
| Physical characteristics | |
| Dimensions | 6.359±0.129 km[4][5] 10.31 km (calculated)[6] |
| 5.1966±0.0082 h[7] | |
| 0.057 (assumed)[6] 0.251±0.055[4][5] | |
| S [8] · C (generic)[6] | |
| 13.1[4] · 13.212±0.005 (R)[7] · 13.3[2] · 13.65±0.27[8] · 13.66[6] | |
Orbit and classification
Adachi is a member of the Agnia family (514),[3][9] a very large family of stony asteroids with more than 2000 known members.[10] They most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that underwent igneous differentiation.[9] The family's parent body and namesake is the asteroid 847 Agnia.[10]
It orbits the Sun in the central asteroid belt at a distance of 2.6–2.9 AU once every 4 years and 8 months (1,698 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.05 and an inclination of 5° with respect to the ecliptic.[2] The first precovery was taken at the U.S. Palomar Observatory in 1953, extending the asteroid's observation arc by 44 years prior to it discovery.[1]
Physical characteristics
Adachi has been characterized as a stony S-type asteroid by Pan-STARRS photometric survey,[8] which agrees with the Agnia family's overall spectral type.[10] : 23
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Adachi measures 6.359 kilometers in diameter and its surface has an albedo between 0.251 and 0.2513.[4][5] The Collaborative Asteroid Lightcurve Link assumes a generic, carbonaceous albedo of 0.057 for all minor planets with a semi-major axis of more than 2.7 AU, and consequently calculates a larger diameter of 10.31 kilometers using an absolute magnitude of 13.66.[6]
Rotation period
In August 2013, a rotational lightcurve of Adachi was obtained through photometric observations at the Palomar Transient Factory in California. It showed a period of 5.1966 hours with a brightness variation of 0.31 magnitude (U=2).[7]
Naming
This minor planet was named after Makoto Adachi (born 1953), Japanese amateur astronomer and elementary school teacher from Kyoto. He is the director of the Oriental Astronomical Association and a long-time direct observer of the Solar System's planets, especially Jupiter.[1] The approved naming citation was published by the Minor Planet Center on 6 August 2003 (M.P.C. 49279).[11]
References
External links
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