7526 Ohtsuka
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| Discovery[1] | |
|---|---|
| Discovered by | T. Urata |
| Discovery site | Oohira Stn. |
| Discovery date | 2 January 1993 |
| Designations | |
| (7526) Ohtsuka | |
Named after | Katsuhito Ohtsuka (astronomer, curator)[2] |
| 1993 AA · 1953 XV 1980 TD13 · 1980 VU3 1984 YK2 | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 63.31 yr (23,123 days) |
| Aphelion | 3.1213 AU |
| Perihelion | 1.8139 AU |
| 2.4676 AU | |
| Eccentricity | 0.2649 |
| 3.88 yr (1,416 days) | |
| 194.19° | |
| Inclination | 4.2151° |
| 232.74° | |
| 151.48° | |
| Physical characteristics | |
| Dimensions | 4.71 km (calculated)[3] 6.64±0.65 km[4] 7.654±0.299 km[5][6] 9.79±0.44 km[7] 11.34±4.59 km[8] |
| 7.109±0.001 h[9] | |
| 0.03±0.02[8] 0.062±0.006[7] 0.091±0.008[5][6] 0.110±0.031[4] 0.20 (assumed)[3] | |
| S[3] | |
| 13.70[7] · 13.8[5] · 13.90[4] · 14.0[1] · 14.16[8] · 14.93±1.67[10] | |
7526 Ohtsuka, provisional designation 1993 AA, is a stony asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by Japanese astronomer Takeshi Urata at Nihondaira Observatory Oohira Station, Japan, on 2 January 1993. The asteroid was named after Japanese astronomer Katsuhito Ohtsuka.[2]
Ohtsuka orbits the Sun in the inner main-belt at a distance of 1.8–3.1 AU once every 3 years and 11 months (1,416 days). Its orbit has an eccentricity of 0.26 and an inclination of 4° with respect to the ecliptic.[1] First observed as 1953 XV at Heidelberg, the body's observation arc begins at Palomar in 1980.[2]
Physical characteristics
Rotation period
In September 2007, a rotational lightcurve of Ohtsuka was obtained from photometric observations by Maurice Clark at the Montgomery College in Rockville, Maryland. Lightcurve analysis gave a rotation period of 7.109±0.001 hours with a brightness amplitude of 0.16 magnitude (U=3-).[9]
Diameter and albedo
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ohtsuka has an albedo in the range of 0.03 to 0.11 with a diameter between 6.64 and 11.34 kilometers.[5][4][7][8] The Collaborative Asteroid Lightcurve Link, however assumes a standard albedo for stony asteroids of 0.20 and calculates and much smaller diameter of 4.7 kilometers.[3]
