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Orbit of 9971 Ishihara (blue), planets (red) and the Sun (black). The outermost planet visible is Jupiter.
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Discovery and designation
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| Discovered by | K. Endate & K. Watanabe | |||||||||
| Discovery date | April 16, 1993 | |||||||||
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Designations
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| MPC designation | 9971 Ishihara | |||||||||
| Alternate name(s) | 1993 HS, 1991 YC2, 1996 EU1 | |||||||||
| Epoch October 27, 2007 | ||||||||||
| Ap | 2.4464386 AU | |||||||||
| Peri | 1.916677 AU | |||||||||
| Semi-major axis | 2.1815578 AU | |||||||||
| Eccentricity | 0.1214182 | |||||||||
| Orbital period | 1176.9242810 d | |||||||||
| Mean anomaly | 137.46549° | |||||||||
| Inclination | 2.74863° | |||||||||
| Longitude of ascending node | 20.62299° | |||||||||
| Argument of peri | 245.92258° | |||||||||
| Dimensions | ~22.4 km[1] | |||||||||
| Surface temp. Kelvin Celsius |
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| Absolute magnitude (H) | 13.9 | |||||||||
9971 Ishihara is a main belt asteroid. It orbits the Sun once every 3.22 years.[2]
Discovered on April 16, 1993 by K. Endate and K. Watanabe it was given the provisional designation 1993 HS. It was later renamed Ishihara after Takahiro Ishihara, a former president of the Hiroshima Astronomical Society.[3]
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