_Jens.png) Shape model ofJens from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 17 February 1950 |
| Designations | |
| (1719) Jens | |
Named after | Jens(discoverer's grandson)[2] |
| 1950 DP · 1939 PP 1939 TD · 1941 BB 1948 RQ · 1948 RS1 1948 TS1 · 1961 TZ1 A922 SC | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 68.65 yr (25,074 days) |
| Aphelion | 3.2474AU |
| Perihelion | 2.0649 AU |
| 2.6562 AU | |
| Eccentricity | 0.2226 |
| 4.33yr (1,581 days) | |
| 321.62° | |
| 0° 13m 39.72s / day | |
| Inclination | 14.281° |
| 323.44° | |
| 58.096° | |
| Physical characteristics | |
| Dimensions | 18.76 km(derived)[3] 18.93±0.9 km[4] 19.77±0.76 km[5] 19.914±0.070 km[6] 21.610±0.086[7] |
| 5.867±0.005h[8] 5.87±0.01 h[9] 5.87016±0.00005 h[10] 5.873±0.005 h[11] | |
| 0.085±0.011[7] 0.1048(derived)[3] 0.1348±0.0306[6] 0.137±0.021[5] 0.1489±0.015[4] | |
| C[12] · S[3] | |
| 11.3[4][5][6] · 11.7[1][3] · 12.04±1.20[12] | |
1719 Jens (prov. designation:1950 DP) is abackground asteroid from the central region of theasteroid belt, approximately 19 kilometers in diameter. It was discovered on 17 February 1950, by German astronomerKarl Reinmuth atHeidelberg Observatory in southern Germany.[13] It was named after a grandson of the discoverer.[2]
_Jens%2c_asteroid%2c_passing_in_front_of_Tadpole_nebula.jpg)
Jens orbits the Sun in thecentral main-belt at a distance of 2.1–3.2 AU once every 4 years and 4 months (1,581 days). Its orbit has aneccentricity of 0.22 and aninclination of 14° with respect to theecliptic.[1] First identified asA922 SC atSimeiz Observatory in 1922,Jens's first used observation was taken atTurku in 1948, extending the body'sobservation arc by 2 years prior to its official discovery observation.[13]
In 2010,Jens was passing in front of the Tadpole Nebula(see image obtained byWISE).[14]
In September 2000, American astronomerBrian Warner obtained two rotationallightcurves, giving arotation period of 5.867 and 5.87 hours with a brightness variation of 0.50 and 0.55magnitude, respectively (U=3/3).[8][9]
In February 2006, photometric observations by French amateur astronomerLaurent Bernasconi gave a concurring period of 5.873 hours with an amplitude of 0.55 magnitude (U=3).[11] This well-defined period was further confirmed by a modeled light-curve using data from the Lowell Photometric Database, giving a period of 5.87016 hours (U=n.a.).[10]
It is classified asS- andC-type asteroid by the LCDB andPan-STARRS, respectively.[3][12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Jens measures between 18.93 and 21.61 kilometers in diameter and its surface has analbedo between 0.085 and 0.149.[4][5][6] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1048 and calculates a diameter of 18.76 kilometers based on an absolute magnitude of 11.7.[3]
Thisminor planet was named by the discoverer for his grandson. Karl Reinmuth also named the consecutively numbered asteroid,1720 Niels, after one of his grandsons.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3933).[15]
