985 Rosina
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| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 14 October 1922 |
| Designations | |
| (985) Rosina | |
Named after | A girl's name picked from a popular German calendar[2] |
| 1922 MO | |
| Mars crosser[1][3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 94.37 yr (34,467 days) |
| Aphelion | 2.9380 AU |
| Perihelion | 1.6604 AU |
| 2.2992 AU | |
| Eccentricity | 0.2778 |
| 3.49 yr (1,273 days) | |
| 92.838° | |
| 0° 16m 57.72s / day | |
| Inclination | 4.0564° |
| 290.33° | |
| 59.636° | |
| Earth MOID | 0.6583 AU · 256.5 LD |
| Physical characteristics | |
| Dimensions | 8.18 km (calculated)[4] |
| 3.012±0.001 h[5] 3.0126±0.0002 h[6] | |
| 0.20 (assumed)[4] | |
| SMASS = S[1][4] · S[7][8] | |
| 12.70[8] · 12.8[1][4] · 13.05±0.30[7] | |
985 Rosina, provisional designation 1922 MO, is a stony asteroid and sizable Mars-crosser on an eccentric orbit from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered on 14 October 1922, by astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory in Germany.[3] The asteroid's name is a common German female name, unrelated to the discoverer's contemporaries.[2]
Rosina is a Mars-crossing asteroid, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.666 AU.[1][3]
It orbits the Sun in the inner main-belt at a distance of 1.7–2.9 AU once every 3 years and 6 months (1,273 days). Its orbit has an eccentricity of 0.28 and an inclination of 4° with respect to the ecliptic.[1] The body's observation arc begins at Vienna Observatory, eight days after its official discovery observation at Heidelberg.[3]
Physical characteristics
In the SMASS classification, Rosina is a stony S-type asteroid.[1] It has also been characterized as such by Pan-STARRS and SDSS.[7][8]
Rotation period
Two rotational lightcurves of Rosina were obtained from photometric observations. Lightcurve analysis gave a well-defined rotation period of 3.012 and 3.0126 hours with an identical brightness amplitude of 0.22 magnitude (U=3/3).[5][6]
Diameter and albedo
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 8.18 kilometers based on an absolute magnitude of 12.8.[4]
