1231 Auricula
1231 Auricula (prov. designation: 1931 TE2) is a carbonaceous background asteroid from the central regions of the asteroid belt, approximately 20 kilometers (12 miles) in diameter. It was discovered on 10 October 1931, by German astronomer Karl Reinmuth at the Heidelberg Observatory. The likely elongated C-type asteroid has a rotation period of 3.98 hours. It was named after the flowering plant auricula and indirectly honors astronomer Gustav Stracke.
Modelled shape of Auricula from its lightcurve | |
| Discovery | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 10 October 1931 |
| Designations | |
MPC designation | (1231) Auricula |
| Pronunciation | /ɔːˈrɪkjʊlə/ |
Named after | Primula auricula (flowering plant) |
Alternative designations | 1931 TE2 |
Minor planet category | main-belt · (middle) background |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.02 yr (31,785 d) |
| Aphelion | 2.8988 AU |
| Perihelion | 2.4388 AU |
Semi-major axis | 2.6688 AU |
| Eccentricity | 0.0862 |
Orbital period (sidereal) | 4.36 yr (1,593 d) |
Mean anomaly | 171.27° |
Mean motion | 0° 13m 33.96s / day |
| Inclination | 11.483° |
Longitude of ascending node | 342.04° |
| 245.60° | |
| Physical characteristics | |
Mean diameter | 13.43±4.67 km 15.10±3.67 km 18.71±0.65 km 21.44±0.81 km 22.52±1.8 km |
Synodic rotation period | 3.9816±0.0006 h |
| 0.066 0.0798 0.089 0.11 | |
| C (SDSS-MOC) | |
| 11.60 12.2 12.29 | |
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