944 Hidalgo
944 Hidalgo /hɪˈdælɡoʊ/ is a centaur and unusual object on an eccentric, cometary-like orbit between the asteroid belt and the outer Solar System, approximately 52 kilometers (32 miles) in diameter. Discovered by German astronomer Walter Baade in 1920, it is the first member of the dynamical class of centaurs ever to be discovered. The dark D-type object has a rotation period of 10.1 hours and likely an elongated shape. It was named after Mexican revolutionary Miguel Hidalgo y Costilla.
Animation of 944 Hidalgo's movement over 5 minutes in 2003, taken by the Very Large Telescope. | |
| Discovery | |
|---|---|
| Discovered by | W. Baade |
| Discovery site | Bergedorf Obs. |
| Discovery date | 31 October 1920 |
| Designations | |
| (944) Hidalgo | |
| Pronunciation | /hɪˈdælɡoʊ/ |
Named after | Miguel Hidalgo y Costilla (Mexican revolutionary) |
| 1920 HZ · A920 UB | |
| centaur · main-belt unusual | |
| Symbol | (astrological) |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 97.97 yr (35,784 d) |
| Aphelion | 9.5345 AU |
| Perihelion | 1.9474 AU |
| 5.7410 AU | |
| Eccentricity | 0.6608 |
| 13.76 yr (5,024 d) | |
| 13.078° | |
| 0° 4m 18.12s / day | |
| Inclination | 42.521° |
| 21.420° | |
| 56.651° | |
| Jupiter MOID | 0.3285 AU |
| TJupiter | 2.0690 |
| Physical characteristics | |
Mean diameter | 52.45±3.60 km 61.4±12.7 km |
| 10.063±0.0003 h | |
| 0.028 0.042 | |
| Tholen = D | |
| 10.77 | |
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