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2181 Fogelin (prov. designation: 1942 YA) is an Eunomia asteroid from the central regions of the asteroid belt, approximately 11 kilometers (7 miles) in diameter. It was discovered on 28 December 1942, by Germany astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[1] In 1980, it was named for Eric S. Fogelin an assistant at the Minor Planet Center.[1] The likely elongated S-type asteroid has a rotation period of 14.07 hours.[3]

2181 Fogelin
Shape model of Fogelin from its lightcurve
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date28 December 1942
Designations
MPC designation
(2181) Fogelin
Named after
Eric S. Fogelin [1]
(MPC staff member)
Alternative designations
1942 YA · 1952 HC2
1975 VF9
Minor planet category
main-belt [1][2] · (middle)
Eunomia [3][4]
Orbital characteristics [2]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc75.08 yr (27,422 d)
Aphelion2.8986 AU
Perihelion2.2836 AU
Semi-major axis
2.5911 AU
Eccentricity0.1187
Orbital period (sidereal)
4.17 yr (1,523 d)
Mean anomaly
354.25°
Mean motion
0° 14m 10.68s / day
Inclination13.007°
Longitude of ascending node
17.286°
Argument of perihelion
116.18°
Physical characteristics
Mean diameter
10.067±0.109 km[5]
10.420±0.089 km[6]
11.29±0.85 km[7]
11.55 km (calculated)[3]
Synodic rotation period
14.07±0.01 h[8]
Geometric albedo
0.200±0.031[7]
0.21 (assumed)[3]
0.2376±0.0548[6]
0.252±0.046[5]
Spectral type
S (assumed)[3]
Absolute magnitude (H)
12.0[2][3] · 12.10[6][7]

    Orbit and classification


    Fogelin is a member of the Eunomia family (502),[3][4] a prominent family 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 the central 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 an eccentricity of 0.12 and an inclination of 13° with respect to the ecliptic.[2] The body's observation arc begins at Heidelberg with its official discovery observation in December 1942.[1]


    Naming


    This minor planet was named by Brian Marsden and Conrad Bardwell of the Minor Planet Center, after their assistant, Eric S. Fogelin. During 1979–1980, he was preparing the center's computerized data and helped publishing the Minor Planet Circulars.[1] The official naming citation was published by the Minor Planet Center on 1 August 1980 (M.P.C. 5451).[10]


    Physical characteristics


    Fogelin is an assumed S-type asteroid,[3] in line with the overall spectral type seen among Eunomian asteroids.[9]: 23  Near-IR spectroscopy at the NASA Infrared Telescope Facility with the SpeX instrument showed that the asteroid contains mafic minerals, which are rich in magnesium and iron.[11]


    Rotation period


    In March 2010, a rotational lightcurve of Fogelin was obtained from photometric observations by Richard Durkee at the Shed of Science Observatory (H39) in the United States. Lightcurve analysis gave a well-defined rotation period of 14.07 hours with a brightness amplitude of 0.57 magnitude, indicative of an elongated shape (U=3).[8]


    Diameter and albedo


    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Fogelin measures between 10.067 and 11.29 kilometers in diameter and its surface has an albedo between 0.200 and 0.252.[5][6][7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21 – derived from 15 Eunomia, the family's parent body and namesake – and calculates a diameter of 11.55 kilometers based on an absolute magnitude of 12.0.[3]


    References


    1. "2181 Fogelin (1942 YA)". Minor Planet Center. Retrieved 19 March 2018.
    2. "JPL Small-Body Database Browser: 2181 Fogelin (1942 YA)" (2018-01-25 last obs.). Jet Propulsion Laboratory. Retrieved 19 March 2018.
    3. "LCDB Data for (2181) Fogelin". Asteroid Lightcurve Database (LCDB). Retrieved 19 March 2018.
    4. "Asteroid 2181 Fogelin – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 26 October 2019.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    6. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    7. Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. (online, AcuA catalog p. 153)
    8. Durkee, Russell I. (July 2010). "Asteroids Observed from the Shed of Science Observatory: 2009 October - 2010 March". The Minor Planet Bulletin. 37 (3): 125–127. Bibcode:2010MPBu...37..125D. ISSN 1052-8091.
    9. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 March 2018.
    11. Birlan, Mirel; Barucci, Maria Antonietta; Vernazza, Pierre; Fulchignoni, Marcello; Binzel, Richard P.; Bus, Schelte J.; et al. (June 2004). "Near-IR spectroscopy of asteroids 21 Lutetia, 89 Julia, 140 Siwa, 2181 Fogelin and 5480 (1989YK8), potential targets for the Rosetta mission; remote observations campaign on IRTF". New Astronomy. 9 (5): 343–351. arXiv:astro-ph/0312638. Bibcode:2004NewA....9..343B. doi:10.1016/j.newast.2003.12.005.



    На других языках

    [de] (2181) Fogelin

    (2181) Fogelin (1942 YA; 1952 HC2; 1975 VF9) ist ein Asteroid des mittleren Hauptgürtels, der am 28. Dezember 1942 vom deutschen Astronomen Karl Wilhelm Reinmuth an der Landessternwarte Heidelberg-Königstuhl auf dem Königstuhl bei Heidelberg (IAU-Code 024) entdeckt wurde. Der Asteroid gehört zur Eunomia-Familie, einer Gruppe von Asteroiden, die nach (15) Eunomia benannt wurde.
    - [en] 2181 Fogelin


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