.png) A three-dimensional model of 158 Koronis based on its light curve. | |
| Discovery[1] | |
|---|---|
| Discovered by | Viktor Knorre |
| Discovery date | 4 January 1876 |
| Designations | |
| (158) Koronis | |
| Pronunciation | /kɒˈroʊnɪs/[2] |
| A876 AA; 1893 PA; 1911 HB; 1955 HA1 | |
| Main belt | |
| Adjectives | Koronidian/kɒrəˈnɪdiən/[3] |
| Orbital characteristics[4][5] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 122.53 yr (44755 d) |
| Aphelion | 3.0181 AU (451.50 Gm) |
| Perihelion | 2.71904 AU (406.763 Gm) |
| 2.86858 AU (429.133 Gm) | |
| Eccentricity | 0.052130 |
| 4.86yr (1774.6d) | |
Averageorbital speed | 17.80 km/s |
| 15.346° | |
| 0° 12m 10.296s / day | |
| Inclination | 1.0015° |
| 277.96° | |
| 142.37° | |
| Earth MOID | 1.7299 AU (258.79 Gm) |
| Jupiter MOID | 2.16233 AU (323.480 Gm) |
| TJupiter | 3.297 |
| Physical characteristics | |
| Dimensions | 35.37±1.4 km |
| 14.218 h (0.5924 d) | |
| 14.218 h (0.592d) | |
| 0.2766±0.024 | |
| S[6] | |
| 9.27 | |
158 Koronis is amain-belt asteroid that was discovered by Russian astronomerViktor Knorre on January 4, 1876, from the Berlinobservatory.[1] It was the first of his four asteroid discoveries. The meaning of the asteroid name is uncertain, but it may come fromCoronis the mother ofAsclepius fromGreek mythology. Alternatively, it may come from Coronis, a nymph of theHyades sisterhood.[7] TheKoronis family is named after this asteroid.
From its spectrum this is classified as anS-type asteroid,[6] indicating a stony composition.Photometric observations show a synodicrotation period of 14.206 ± 0.002 hours with a brightness variation of 0.28–0.43 inmagnitude.[8] A subsequent study at the Altimira Observatory during 2010 was in agreement with this estimate, yielding a rotation period of 14.208 ± 0.040 hours.[9] Based on a model constructed from the lightcurve, the shape of Koronis resembles that of243 Ida, an asteroid in the same family, although it is a bit larger.[1]
A collision involving 158 Koronis 15 million years ago created a cluster of 246 objects. 158 Koronis itself retained 98.7% of the total mass. These new objects formed the Koronis(2) family. Koronis(2) is a subfamily of the much largerKoronis family.[10]
