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] | |
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]
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]
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
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]
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]
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]
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] | |
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]
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]
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
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]
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]
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]