2939 Coconino
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| 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 | 2.8399 AU |
| Perihelion | 2.0394 AU |
| 2.4396 AU | |
| Eccentricity | 0.1641 |
| 3.81 yr (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±0.00004 h[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 designation 1982 DP, is a stony Nysian asteroid from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 21 February 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station in Flagstaff, United States.[8] It is named after the Coconino County in Arizona.[2]
Coconino is a stony S-type asteroid and a member of the main-belt's Nysa family, which is named after its largest member 44 Nysa. It orbits the Sun in the inner main-belt at a distance of 2.0–2.8 AU once every 3 years and 10 months (1,392 days). Its orbit has an eccentricity of 0.16 and an inclination of 4° with respect to the ecliptic.[1] It was first identified as 1952 HU3 at McDonald Observatory in 1952, extending the body's observation arc by 30 years prior to its official discovery observation at Flagstaff.[8]
Physical characteristics
Rotation period
In February 2005, a rotational lightcurve of Coconino was obtained from photometric observations by astronomer Horácio Correia. Lightcurve analysis gave a well-defined rotation period of 4.68138 hours with a brightness amplitude of 0.46 magnitude (U=3).[6]
Diameter and albedo
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Coconino measures 5.607 kilometers in diameter and its surface has a high albedo of 0.512,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and consequently calculates a larger diameter of 9.40 kilometers, using an absolute magnitude of 12.5.[3]
