_Fogelin.png) Shape model ofFogelin from itslightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 28 December 1942 |
| Designations | |
| (2181) Fogelin | |
Named after | Eric S. Fogelin[1] (MPC staff member) |
| 1942 YA · 1952 HC2 1975 VF9 | |
| main-belt[1][2] · (middle) Eunomia[3][4] | |
| Orbital characteristics[2] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 75.08yr (27,422 d) |
| Aphelion | 2.8986AU |
| Perihelion | 2.2836 AU |
| 2.5911 AU | |
| Eccentricity | 0.1187 |
| 4.17 yr (1,523 d) | |
| 354.25° | |
| 0° 14m 10.68s / day | |
| Inclination | 13.007° |
| 17.286° | |
| 116.18° | |
| Physical characteristics | |
| 10.067±0.109 km[5] 10.420±0.089 km[6] 11.29±0.85 km[7] 11.55 km(calculated)[3] | |
| 14.07±0.01 h[8] | |
| 0.200±0.031[7] 0.21(assumed)[3] 0.2376±0.0548[6] 0.252±0.046[5] | |
| S(assumed)[3] | |
| 12.0[2][3] · 12.10[6][7] | |
2181 Fogelin (prov. designation:1942 YA) is anEunomia asteroid from the central regions of theasteroid belt, approximately 11 kilometers (7 miles) in diameter. It was discovered on 28 December 1942, by Germany astronomerKarl Reinmuth at theHeidelberg Observatory in southwest Germany.[1] In 1980, it was named for Eric S. Fogelin an assistant at theMinor Planet Center.[1] The likely elongatedS-type asteroid has arotation period of 14.07 hours.[3]
Fogelin is a member of theEunomia family (502),[3][4] a prominentfamily of stony asteroid and the largest one in the intermediate main belt with more than 5,000 known members.[9] It orbits the Sun in thecentral main-belt at a distance of 2.3–2.9 AU once every 4 years and 2 months (1,523 days;semi-major axis of 2.59 AU). Its orbit has aneccentricity of 0.12 and aninclination of 13° with respect to theecliptic.[2] The body'sobservation arc begins at Heidelberg with its official discovery observation in December 1942.[1]
Thisminor planet was named byBrian Marsden and Conrad Bardwell of theMinor Planet Center, after their assistant, Eric S. Fogelin. During 1979–1980, he was preparing the center's computerized data and helped publishing theMinor Planet Circulars.[1] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5451).[10]
Fogelin is an assumedS-type asteroid,[3] in line with the overallspectral type seen among Eunomian asteroids.[9]: 23 Near-IR spectroscopy at theNASA Infrared Telescope Facility with theSpeX instrument showed that the asteroid containsmafic minerals, which are rich in magnesium and iron.[11]
In March 2010, a rotationallightcurve ofFogelin was obtained fromphotometric observations by Richard Durkee at the Shed of Science Observatory (H39) in the United States. Lightcurve analysis gave a well-definedrotation period of 14.07 hours with a brightness amplitude of 0.57magnitude, indicative of an elongated shape (U=3).[8]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Fogelin measures between 10.067 and 11.29 kilometers in diameter and its surface has analbedo between 0.200 and 0.252.[5][6][7] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from15 Eunomia, the family'sparent body and namesake – and calculates a diameter of 11.55 kilometers based on anabsolute magnitude of 12.0.[3]
