391 Ingeborg
391 Ingeborg (prov. designation: A894 VB or 1894 BE) is an asteroid and second-largest Mars-crosser on an eccentric orbit from the asteroid belt. It was discovered by German astronomer Max Wolf on 1 November 1894, at the Heidelberg Observatory in southwest Germany. When discovered, it was observed for a couple of weeks, and follow-up observations were made in 1901 and 1904. The stony S-type asteroid has a rotation period of 26.4 hours and measures approximately 17 kilometers (11 miles) in diameter. Any reference of the asteroid's name to a person is unknown.
Modelled shape of Ingeborg from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 1 November 1894 |
| Designations | |
MPC designation | (391) Ingeborg |
| Pronunciation | German: [ˈɪŋəbɔʁk] |
Named after | unknown (Ingeborg) |
Alternative designations | 1894 BE · 1934 AJ A894 VB |
Minor planet category | Mars-crosser |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.86 yr (44,875 days) |
| Aphelion | 3.0285 AU |
| Perihelion | 1.6120 AU |
Semi-major axis | 2.3203 AU |
| Eccentricity | 0.3052 |
Orbital period (sidereal) | 3.53 yr (1,291 days) |
Mean anomaly | 292.16° |
Mean motion | 0° 16m 44.04s / day |
| Inclination | 23.202° |
Longitude of ascending node | 212.88° |
| 147.06° | |
| Mars MOID | 0.2350 AU |
| Physical characteristics | |
| Dimensions | 15.75±3.05 km 17.33±1.73 km 18.15±0.19 km 19.63 km (calculated) |
Synodic rotation period | 16 h 26.39±0.02 h 26.391±0.006 h 26.4145±0.0005 h 26.4146±0.0005 h 26.4149±0.0001 h |
| 0.20 (assumed) 0.282±0.056 0.290±0.110 0.34±0.16 0.495±0.013 | |
| Tholen = S SMASS = S | |
| 10.10 · 10.21±0.81 · 10.80 · 10.9 · 10.9±0.2 | |
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