1761 Edmondson

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1761 Edmondson
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date30 March 1952
MPC designation(1761) Edmondson
Named after
Frank Edmondson
(American astronomer)[2]
1952 FN · 1940 BC
1950 XP · 1952 HT
1955 US · 1969 JK
1978 WY
main-belt · background[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc64.74 yr (23,646 days)
Aphelion3.9145 AU
Perihelion2.4388 AU
3.1766 AU
5.66 yr (2,068 days)
0° 10m 26.76s / day
Physical characteristics
Dimensions20.51 km (calculated)[3]
21.94±0.94 km[4]
4.208±0.002 h[5]
0.08 (assumed)[3]
11.40[4] · 11.8[1][3] · 12.06±0.33[6]

1761 Edmondson, provisional designation 1952 FN, is a dark background asteroid from the outer regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 30 March 1952, by the Indiana Asteroid Program at Goethe Link Observatory, United States,[7] it was named after astronomer Frank Edmondson.[2]

Orbit and classification[edit]

Edmondson is a background asteroid, located near the region occupied by the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits, it orbits the Sun in the outer main-belt at a distance of 2.4–3.9 AU once every 5 years and 8 months (2,068 days). Its orbit has an eccentricity of 0.23 and an inclination of 2° with respect to the ecliptic.[1]

It was first identified as 1940 BC at Konkoly Observatory in 1940. The body's observation arc begins with its identification as 1950 XP at McDonald Observatory in 1950, or 2 years prior to its official discovery observation at Goethe Link.[7]

Physical characteristics[edit]

Edmondson has been characterized as a carbonaceous C-type asteroid.[3]

Rotation period[edit]

In November 2012, a rotational lightcurve of Edmondson was obtained from photometric observations at the Etscorn Campus Observatory (719) in New Mexico, United States. Lightcurve analysis gave a well-defined rotation period of 4.208 hours with a brightness variation of 0.29 magnitude (U=3).[5]

Diameter and albedo[edit]

According to the surveys carried out by the Japanese Akari satellite, Edmondson measures 21.94 kilometers in diameter and its surface has an albedo of 0.102,[4] while the Collaborative Asteroid Lightcurve Link assumes a more typical albedo for carbonaceous asteroids of 0.08 and calculates a diameter of 20.51 kilometers with an absolute magnitude of 11.8.[3]


This minor planet was named for astronomer Frank K. Edmondson (1912–2008) of Indiana University, the program's founder and director.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 3143).[8]


  1. ^ a b c d "JPL Small-Body Database Browser: 1761 Edmondson (1952 FN)" (2016-12-25 last obs.). Jet Propulsion Laboratory. Retrieved 14 June 2017.
  2. ^ a b c Schmadel, Lutz D. (2007). "(1761) Edmondson". Dictionary of Minor Planet Names – (1761) Edmondson. Springer Berlin Heidelberg. p. 140. doi:10.1007/978-3-540-29925-7_1762. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f g "LCDB Data for (1761) Edmondson". Asteroid Lightcurve Database (LCDB). Retrieved 14 June 2017.
  4. ^ a b c d 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. Retrieved 14 June 2017.
  5. ^ a b Klinglesmith, Daniel A., III; Hanowell, Jesse; Risley, Ethan; Turk, Janek; Vargas, Angelica; Warren, Curtis Alan (April 2013). "Asteroid Synodic Periods from Etscorn Campus Observatory". The Minor Planet Bulletin. 40 (2): 65–67. Bibcode:2013MPBu...40...65K. ISSN 1052-8091. Retrieved 14 June 2017.
  6. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 14 June 2017.
  7. ^ a b "1761 Edmondson (1952 FN)". Minor Planet Center. Retrieved 14 June 2017.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 14 June 2017.

External links[edit]