.png) Lightcurve-based 3D-model ofKarel | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 2 August 1949 |
| Designations | |
| (1682) Karel | |
Named after | Karel van Houten (son of astronomers) Cornelis andIngrid[2] |
| 1949 PH · 1929 SD 1939 RK · 1946 WC 1949 QQ · 1949 QX1 1949 SL · 1959 PH 1988 CR3 | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.39 yr (31,918 days) |
| Aphelion | 2.6685AU |
| Perihelion | 1.8085 AU |
| 2.2385 AU | |
| Eccentricity | 0.1921 |
| 3.35yr (1,223 days) | |
| 106.49° | |
| 0° 17m 39.48s / day | |
| Inclination | 4.0276° |
| 325.78° | |
| 9.9066° | |
| Physical characteristics | |
| Dimensions | 4.80±0.55 km[4] 7.267±0.195 km[5] 7.47 km(calculated)[3] |
| 3.37485±0.00003h[6] 3.37485±0.00005 h[7] | |
| 0.24(assumed)[3] 0.278±0.027[5] 0.531±0.124[4] | |
| S[3] | |
| 12.70[5] · 12.8[1][3] · 12.82±0.32[8] · 12.90[4] | |
1682 Karel, provisional designation1949 PH, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 7.5 kilometers in diameter.
It was discovered on 2 August 1949, by German astronomerKarl Reinmuth atHeidelberg Observatory in southern Germany, and later named after the son of Dutch astronomer coupleIngrid andCornelis van Houten.[2][9]
Karel is a member of theFlora family, one of the largest collisional populations ofstony asteroids in theinner main-belt. It orbits the Sun at a distance of 1.8–2.7 AU once every 3 years and 4 months (1,223 days). Its orbit has aneccentricity of 0.19 and aninclination of 4° with respect to theecliptic.[1] In 1929,Karel was first identified as1929 SD at Heidelberg, extending the body'sobservation arc by 20 years prior to its official discovery observation.[9]
AstronomersFrançois Colas, Jean Lecacheux, Federico Manzini andRaoul Behrend obtained a rotationallightcurve ofKarel from photometric observations in January 2008. It gave a well-definedrotation period of 3.37485 hours with a brightness variation of 0.47 inmagnitude (U=3).[6] An identical period was modeled from the Lowell Photometric Database (U=n.a.).[7]
According to the survey carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Karel measures 4.80 and 7.27 kilometers in diameter, and its surface has analbedo of 0.278 and 0.531, respectively.[4][5] TheCollaborative Asteroid Lightcurve Link assumes analbedo of 0.24 – derived from8 Flora, the largest member and namesake of this family – and calculates a diameter of 7.47 kilometers based on an absolute magnitude of 12.8.[3]
Thisminor planet was named after Karel van Houten, son of Dutch astronomersIngrid andCornelis van Houten of theLeiden Observatory.[2] Together with Ingrid, Reinmuth discovered the minor planet1691 Oort in 1956. Reinmuth also named his two discoveries,1673 van Houten and1674 Groeneveld, after the prolific couple of Dutch astronomers.[10][11] The officialnaming citation was published by theMinor Planet Center on 15 December 1968 (M.P.C. 2901).[12]
