| Discovery[1] | |
|---|---|
| Discovered by | P. Wild |
| Discovery site | Zimmerwald Obs. |
| Discovery date | 25 October 1973 |
| Designations | |
| (1911) Schubart | |
Named after | Joachim Schubart (German astronomer)[2] |
| 1973 UD · 1928 DW 1933 UX1 · 1941 SU1 1951 AH1 · 1952 DS2 1960 EF · 1968 FM 1972 RO · 1972 TY4 | |
| main-belt · (outer)[1] Hilda · Schubart[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 89.27 yr (32,606 days) |
| Aphelion | 4.6512AU |
| Perihelion | 3.3013 AU |
| 3.9762 AU | |
| Eccentricity | 0.1697 |
| 7.93yr (2,896 days) | |
| 136.84° | |
| 0° 7m 27.48s / day | |
| Inclination | 1.6431° |
| 284.84° | |
| 181.75° | |
| Jupiter MOID | 0.5059 AU |
| TJupiter | 3.0310 |
| Physical characteristics | |
| Dimensions | 64.66±23.84 km[4] 67.476±0.504 km[5] 80.09±2.0 km[6] 80.11 km(derived)[7] 80.13±1.25 km[8] |
| 7.91±0.02h[9] 11.915±0.002 h[10] | |
| 0.0249±0.001[6] 0.025±0.001[8] 0.0316(derived)[7] 0.035±0.001[5] 0.04±0.01[5] 0.04±0.03[4] | |
| Tholen =P[1][7] · C/P[5] B–V = 0.701[1] U–B = 0.217[1] | |
| 9.85[7][11] · 10.11[1][4][6][8] | |
1911 Schubart, provisional designation1973 UD, is a dark Hildianasteroid and parent body of theSchubart family, located in the outermost region of theasteroid belt, approximately 70 kilometers in diameter. It was discovered on 25 October 1973, by Swiss astronomerPaul Wild atZimmerwald Observatory, near Bern, Switzerland.[12] The asteroid was named after German astronomerJoachim Schubart.[2]
With a diameter of 65–80 kilometers, it is one of the largest members of theHilda group of asteroids, which are in 3:2orbital resonance with the gas-giant Jupiter. More specifically, it is the parent body and namesake of theSchubart family (002),[3] one of twoasteroid families within the Hilda group (the other one is the Hilda family itself).[13][14]: 23 It is the darkestP-type asteroid with a very lowgeometric albedo of 0.0249.[1]
The body'sobservation arc begins with its first identification as1928 DW atHeidelberg Observatory in February 1928, more than 45 years prior to its official discovery observation at Zimmerwald .[12]
In theTholen classification,Schubart is a primitiveP-type asteroid.[1][7] TheWide-field Infrared Survey Explorer (WISE) characterized it as both P- andC-type asteroid.[5]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA's WISE telescope,Schubart measures between 64.66 and 80.13 kilometers in diameter and its surface has analbedo between 0.0249 and 0.04.[4][5][6][8]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0316 and a diameter of 80.11 kilometers based on anabsolute magnitude of 9.85.[7]
Two rotationallightcurves ofSchubart were obtained from photometric observations by Johan Warell andRobert Stephens in 2015 and 2016, respectively. Lightcurve analysis gave arotation period of 7.91 and 11.915 hours with a brightness amplitude of 0.11 and 0.22 inmagnitude, respectively (U=2/2).[9][10]
Theminor planet is named in after GermanARI-astronomerJoachim Schubart (born 1928), who is also adiscoverer of minor planets, namely2000 Herschel and4724 Brocken. He studied in detail members of the Hilda family, as he developed an averaging techniques for observing the long-term motions of asteroids.[2] Schubart has also been an active member on several commissions of theInternational Astronomical Union.[15] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3937).[16]
