| Discovery[1] | |
|---|---|
| Discovered by | E. Bowell |
| Discovery site | Anderson Mesa Stn. |
| Discovery date | 21 February 1982 |
| Designations | |
| (2939) Coconino | |
Named after | Coconino County (U.S. county in Arizona)[2] |
| 1982 DP · 1952 HU3 1976 ST4 | |
| main-belt · Nysa[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 40.69 yr (14,861 days) |
| Aphelion | 2.8399AU |
| Perihelion | 2.0394 AU |
| 2.4396 AU | |
| Eccentricity | 0.1641 |
| 3.81yr (1,392 days) | |
| 47.539° | |
| Inclination | 3.9489° |
| 349.97° | |
| 237.31° | |
| Physical characteristics | |
| Dimensions | 5.607±0.177 km[4][5] 9.40 km(calculated)[3] |
| 4.68138±0.00004h[6] | |
| 0.20(assumed)[3] 0.512±0.043[4][5] | |
| S[3] | |
| 12.5[1][3] · 12.6[4] · 12.92±0.10[7] | |
2939 Coconino, provisional designation1982 DP, is a stony Nysianasteroid from the inner regions of theasteroid belt, approximately 6 kilometers in diameter. It was discovered on 21 February 1982, by American astronomerEdward Bowell at Lowell'sAnderson Mesa Station in Flagstaff, United States.[8] It is named after theCoconino County in Arizona.[2]
Coconino is a stonyS-type asteroid and a member of the main-belt'sNysa family, which is named after its largest member44 Nysa. It orbits the Sun in theinner main-belt at a distance of 2.0–2.8 AU once every 3 years and 10 months (1,392 days). Its orbit has aneccentricity of 0.16 and aninclination of 4° with respect to theecliptic.[1]It was first identified as1952 HU3 atMcDonald Observatory in 1952, extending the body'sobservation arc by 30 years prior to its official discovery observation at Flagstaff.[8]
In February 2005, a rotationallightcurve ofCoconino was obtained from photometric observations by astronomer Horácio Correia. Lightcurve analysis gave a well-definedrotation period of 4.68138 hours with a brightness amplitude of 0.46magnitude (U=3).[6]
According to the survey carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Coconino measures 5.607 kilometers in diameter and its surface has a highalbedo of 0.512,[4][5] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and consequently calculates a larger diameter of 9.40 kilometers, using anabsolute magnitude of 12.5.[3]
Thisminor planet was named after the U.S.Coconino County, Arizona, of which the city of Flagstaff with its discovering observatory is the county seat. The word "Coconino" derives from the language of theHopi Tribe of Arizona.[2] The official naming citation was published by theMinor Planet Center on 17 February 1984 (M.P.C. 8544).[9]
