| Discovery[1] | |
|---|---|
| Discovered by | Indiana University (Indiana Asteroid Program) |
| Discovery site | Goethe Link Obs. |
| Discovery date | 7 November 1953 |
| Designations | |
| (1764) Cogshall | |
Named after | Wilbur A. Cogshall[2] (professor of astronomy at IU) |
| 1953 VM1 · 1935 MF 1939 CC · 1942 VB 1951 LC · 1952 SM 1953 XJ · 1964 XG 1967 GO · 1969 TN2 | |
| main-belt · (outer) Themis[3][4][5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.02 yr (29,956 days) |
| Aphelion | 3.4671AU |
| Perihelion | 2.7193 AU |
| 3.0932 AU | |
| Eccentricity | 0.1209 |
| 5.44yr (1,987 days) | |
| 84.951° | |
| 0° 10m 52.32s / day | |
| Inclination | 2.2355° |
| 152.23° | |
| 79.719° | |
| Physical characteristics | |
| Dimensions | 25.14±0.64 km[6] 26.13 km(derived)[3] 26.21±2.0 km[7] 26.970±0.232 km[8] 29.671±0.179 km[9] |
| 3.624±0.0052h(R)[10] 3.62417±0.00007 h[11] 3.630±0.0052 h(S)[10] | |
| 0.0606±0.0086[9] 0.0712(derived)[3] 0.0852±0.015[7] 0.094±0.005[6] 0.109±0.010[8] | |
| S/C(generically assumed)[3] | |
| 11.20[6][7] · 11.248±0.002(R)[10] · 11.3[9] · 11.4[1][3] | |
1764 Cogshall, provisional designation1953 VM1, is a carbonaceous Themistianasteroid from the outer regions of theasteroid belt, approximately 26 kilometers in diameter. It was discovered on 7 November 1953 by astronomers of theIndiana Asteroid Program atGoethe Link Observatory in Indiana, United States.[12] The asteroid was named afterWilbur Cogshall, professor of astronomy atIndiana University.[2]
Cogshall is a Themistian asteroid that belongs to theThemis family (602),[4][5] a very largefamily of carbonaceous asteroids named after24 Themis.[13]: 23 It orbits the Sun in theouter main belt at a distance of 2.7–3.5 AU once every 5 years and 5 months (1,987 days). Its orbit has aneccentricity of 0.12 and aninclination of 2° concerning to theecliptic.[1]
The asteroid was first identified as1935 MF atJohannesburg Observatory in June 1935. The body'sobservation arc begins with its identification as1939 CC atTurku Observatory in February 1939, more than 14 years before its official discovery observation at Goethe Link.[12]
In May 2005, French amateur astronomerPierre Antonini obtained a rotationallightcurve ofCogshall from photometric observations. Lightcurve analysis gave a well-definedrotation period of 3.62417 hours with a brightness variation of 0.21magnitude (U=3).[11]
Observations at thePalomar Transient Factory in 2012 gave a concurring period of 3.624 and 3.630 hours with an amplitude of 0.22 and 0.20 magnitude in the R- and S-band, respectively (U=2/2).[10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Cogshall measures between 25.14 and 29.671 kilometers in diameter, and its surface has analbedo between 0.0606 and 0.109.[6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0712 and a diameter of 26.13 kilometers based on anabsolute magnitude of 11.4.[3]
Thisminor planet was named after American astronomerWilbur A. Cogshall, a professor of astronomy atIndiana University and director of theKirkwood Observatory for more than four decades (1900–1944). His research included visualbinary stars and the photography ofsolar eclipses. The name was proposed byFrank K. Edmondson, who initiated theIndiana Asteroid Program.[2][14] TheMinor Planet Center published the officialnaming citation on 20 February 1971 (M.P.C. 3143).[15]
