182 Elsa
Elsa (/ˈɛlzə/; minor planet designation: 182 Elsa) is a Massalia or background asteroid from the inner regions of the asteroid belt, approximately 44 kilometers (27 miles) in diameter. It was discovered on 7 February 1878, by Austrian astronomer Johann Palisa at the Austrian Naval Observatory in today's Croatia. The S-type asteroid has a very long rotation period of 80 hours and likely an elongated shape. The origin of its name is uncertain.
Lightcurve-based 3D-model of Elsa | |
| Discovery | |
|---|---|
| Discovered by | J. Palisa |
| Discovery site | Austrian Naval Obs. |
| Discovery date | 7 February 1878 |
| Designations | |
MPC designation | (182) Elsa |
| Pronunciation | /ˈɛlzə/ |
Named after | uncertain; various suggestions |
Alternative designations | A878 CC; 1948 XS; 1950 HY |
Minor planet category | main-belt · (inner) Massalia · background |
| Orbital characteristics | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 114.68 yr (41,886 d) |
| Aphelion | 2.8656 AU |
| Perihelion | 1.9657 AU |
Semi-major axis | 2.4156 AU |
| Eccentricity | 0.1863 |
Orbital period (sidereal) | 3.75 yr (1,371 d) |
Mean anomaly | 282.09° |
Mean motion | 0° 15m 45s / day |
| Inclination | 2.0054° |
Longitude of ascending node | 107.18° |
| 310.85° | |
| Physical characteristics | |
Mean diameter | 43.68±4.1 km 44.000±4.279 km 44±0.1 km 45.15±0.62 km 45.72±7.82 km |
Synodic rotation period | 80.088±0.002 h |
| 0.2083±0.045 0.209±0.007 0.21±0.08 0.2106±0.0603 | |
| Tholen = S SMASS = S B–V = 0.862 U–B = 0.425 | |
| 9.12 9.14 9.26±0.09 9.3±0.1 | |
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