| Discovery[1] | |
|---|---|
| Discovered by | C. U. Cesco A. R. Klemola |
| Discovery site | El Leoncito (Yale–Columbia Southern Station) |
| Discovery date | 6 May 1967 |
| Designations | |
| (2308) Schilt | |
Named after | Jan Schilt(astronomer)[2] |
| 1967 JM · 1926 GP 1930 DR · 1972 TX7 1976 UH12 · 1980 VF 1981 YM | |
| main-belt · Eunomia[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.71 yr (30,210 days) |
| Aphelion | 2.9873AU |
| Perihelion | 2.1114 AU |
| 2.5494 AU | |
| Eccentricity | 0.1718 |
| 4.07yr (1,487 days) | |
| 117.70° | |
| 0° 14m 31.56s / day | |
| Inclination | 14.176° |
| 34.265° | |
| 233.60° | |
| Physical characteristics | |
| Dimensions | 13.79±0.57 km[4] 17.51 km(derived)[3] 17.54±0.8 km(IRAS:18)[1] 17.626±0.220 km[5] 17.719±0.098 km[6] |
| 9.759±0.002h[7] 9.767±0.005 h[a] | |
| 0.1001(derived)[1] 0.1088±0.0335[5] 0.1094±0.011(IRAS:18)[1] 0.177±0.024[4][6] | |
| SMASS =S[1] · S[3] | |
| 11.8[4][5] · 11.9[1][3] | |
2308 Schilt, provisional designation1967 JM, is a stony Eunomiaasteroid from theasteroid belt, approximately 17 kilometers in diameter. It was discovered on 6 May 1967, by Argentine astronomerCarlos Cesco together with American astronomer Arnold Klemola at the Yale–Columbia Southern Station atLeoncito Astronomical Complex in Argentina.[8]
Schilt is a member of theEunomia family, a large group of stony asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun in thecentral main-belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,487 days). Its orbit has aneccentricity of 0.17 and aninclination of 14° with respect to theecliptic.[1] The asteroidsobservation arc begins with its discovery in 1967. However, the first (unused)precovery was already taken atHeidelberg Observatory in 1921.[8]
In theSMASS taxonomy,Schilt has been characterized as a commonS-type asteroid.[1]
A rotationallightcurve was obtained based onphotometric observations at the Australian Oakley Southern Sky Observatory in August 2012. The lightcurve showed aperiod of9.759±0.002 hours with a brightness amplitude of 0.44 inmagnitude (U=3).[7] A previous observation by Argentine astronomer Salvador Mazzone at the Observatorio Astronómico Salvador gave a similar period of9.767±0.005 with an amplitude of 0.42 in magnitude (U=3-).[a]
According to the surveys carried out by the Infrared Astronomical Satellite (IRAS) and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, the asteroid measures between 13.8 and 17.7 kilometers in diameter and its surface has analbedo in the range of 0.10–0.17.[1][4][5] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.10 and a diameter of 17.5 kilometers.[3]
Thisminor planet was named after Dutch–American astronomerJan Schilt (1894–1982), one of the founders of the discovering Columbia–Yale Southern Station in the early 1960s, for which he collaborated with local astronomer and with Yale's Dirk Brouwer, after whom the minor planet1746 Brouwer is named. AtColumbia University, Schilt's research included the dynamics and structure of galaxies, and improvements in measuring the brightness of stars.[2][9] The official naming citation was published by theMinor Planet Center on 11 December 1981 (M.P.C. 6531).[10]
