1761 Edmondson

1761 EdmondsonDiscovery[1]

Discovered by| Indiana University
(Indiana Asteroid Program)
Discovery site| Goethe Link Obs.
Discovery date| 30 March 1952
Designations

MPC designation

| (1761) Edmondson
Named after| Frank Edmondson
(American astronomer)[2]

Alternative designations

| 1952 FN * 1940 BC
1950 XP * 1952 HT
1955 US * 1969 JK
1978 WY
Minor planet category| main-belt * background[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc| 64.74 yr (23,646 days)
|{{{apsis}}}|helion}}| 3.9145 AU
|{{{apsis}}}|helion}}| 2.4388 AU

Semi-major axis

| 3.1766 AU
Eccentricity| 0.2323
Orbital period| 5.66 yr (2,068 days)
Mean anomaly| 282.49°
Mean motion| 0° 10m 26.76s / day
Inclination| 2.4636°
Longitude of ascending node| 76.988°

|{{{apsis}}}|helion}}

| 49.903°
Physical characteristics
Dimensions| 20.51 km (calculated)[3]
21.94±0.94 km[4]
Rotation period| 4.208±0.002 h[5]
Geometric albedo| 0.08 (assumed)[3]
0.102±0.009[4]

Spectral type

| C[3]
Absolute magnitude (H)| 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]

## Contents

* 1 Orbit and classification
* 2 Physical characteristics
* 2.1 Rotation period
* 2.2 Diameter and albedo
* 3 Naming
* 4 References
* 5 External links

## Orbit and classification

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

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

### Rotation period

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 ({{{1}}}).[5]

### Diameter and albedo

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]

## Naming

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 on 20 February 1971 (M.P.C. 3143).[8]

## References

1. ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 1761 Edmondson (1952 FN)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001761.
2. ↑ 2.0 2.1 2.2 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. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "LCDB Data for (1761) Edmondson". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1761|Edmondson.
4. ↑ 4.0 4.1 4.2 4.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
5. ↑ 5.0 5.1 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. ISSN 1052-8091. Bibcode: 2013MPBu...40...65K. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013MPBu...40...65K. 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 14 June 2017.
7. ↑ 7.0 7.1 "1761 Edmondson (1952 FN)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1761.
8. ↑ Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7. https://archive.org/details/dictionaryminorp2008schm.

## External links

* Asteroid Lightcurve Database (LCDB), query form (info )
* Dictionary of Minor Planet Names, Google books
* Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
* Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
* 1761 Edmondson at AstDyS-2, Asteroids—Dynamic Site
* Ephemeris * Observation prediction * Orbital info * Proper elements * Observational info
* 1761 Edmondson at the JPL Small-Body Database
* Close approach * Discovery * Ephemeris * Orbit diagram * Orbital elements * Physical parameters

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