9971 Ishihara
Orbit of Ishihara (blue), inner planets and Jupiter (outermost)
|
|
| Discovery | |
|---|---|
| Discovered by |
K. Endate K. Watanabe |
| Discovery site | Kitami Observatory |
| Discovery date | 16 April 1993 |
| Designations | |
| MPC designation | (9971) Ishihara |
|
Named after
|
Takahiro Ishihara (Japanese astronomer) |
| 1993 HS · 1991 YC2 1996 EU1 |
|
| main-belt · Flora | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 24.91 yr (9,097 days) |
| Aphelion | 2.4463 AU |
| Perihelion | 1.9167 AU |
| 2.1815 AU | |
| Eccentricity | 0.1214 |
| 3.22 yr (1,177 days) | |
| 97.532° | |
| 0° 18m 21.24s / day | |
| Inclination | 2.7484° |
| 20.551° | |
| 246.00° | |
| Physical characteristics | |
| Dimensions | 3.74 km (calculated) 4.986±0.053 km 5.012±0.069 km |
|
6.715±0.0036 h 6.71574±0.00001 h |
|
|
0.2328±0.0281 0.235±0.027 0.24 (assumed) |
|
| S | |
| 13.7 · 13.9 · 13.852±0.006 (R) · 14.26±0.22 · 14.3 | |
9971 Ishihara, provisional designation 1993 HS, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 4 to 5 kilometers in diameter. It was discovered by Japanese amateur astronomers Kin Endate and Kazuro Watanabe at Kitami Observatory on 16 April 1993, and named after Takahiro Ishihara, president of the astronomical society at Hiroshima.
Ishihara is a member of the Flora family, one of the largest families of stony asteroids in the asteroid belt. It orbits the Sun in the inner main-belt at a distance of 1.9–2.4 AU once every 3 years and 3 months (1,177 days). Its orbit has an eccentricity of 0.12 and an inclination of 3° with respect to the ecliptic. It was first identified as 1991 YC2 at Karl Schwarzschild Observatory in 1991, extending the body's observation arc by approximately 2 years prior to its official discovery at Kitami.
In January 2012, a rotational lightcurve of Ishihara was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 6.715 hours with a brightness amplitude of 1.06 in magnitude, which indicates that the body has a non-spheroidal shape (U=2).
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