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7476 Ogilsbie, provisional designation 1993 GE, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter. It was discovered by American astronomer Timothy Spahr at the U.S. Catalina Station in Tucson, Arizona, on 14 April 1993.[7]

7476 Ogilsbie
Discovery [1]
Discovered byT. B. Spahr
Discovery siteCatalina Stn.
Discovery date14 April 1993
MPC designation(7476) Ogilsbie
Named after
Brian Ogilsbie
(friend of discoverer)[2]
1993 GE · 1971 HU
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.82 yr (23,312 days)
Aphelion3.8716 AU
Perihelion2.4313 AU
3.1514 AU
5.59 yr (2,043 days)
0° 10m 34.32s / day
Physical characteristics
18.996±0.118 km[5]
27.90 km (calculated)[3]
3.92±0.01 h[6]
0.057 (assumed)[3]
11.5[1][3] · 11.3[5]

Orbit and classificationEdit

Ogilsbie orbits the Sun in the outer main-belt at a distance of 2.4–3.9 AU once every 5 years and 7 months (2,043 days). Its orbit has an eccentricity of 0.23 and an inclination of 26° with respect to the ecliptic.[1] The first used precovery was obtained at Palomar Observatory in 1990, extending the asteroid's observation arc by 3 years prior to its discovery. The first (unused) observation at Palomar dates back to 1953.[7]

Physical characteristicsEdit

In 2010, a photometric lightcurve analysis by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory (B88) in Mombercelli, Italy, rendered a well-defined rotation period of 3.92±0.01 hours with a brightness amplitude of 0.40 in magnitude (U=3).[6]

According to the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Ogilsbie has a diameter of 18.5 and 19.0 kilometer based on an albedo of 0.15 and 0.18, respectively,[5][4] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and hence calculates a larger diameter of 27.9 kilometers.[3]


This minor planet was named in memory of Brian K. Ogilsbie (1970–1997). School mate and good friend, he is well remembered by the discoverer for the long talks they had on their excursions.[2] The official naming citation was published by the Minor Planet Center on 27 April 2002 (M.P.C. 45336).[8]


  1. ^ a b c d "JPL Small-Body Database Browser: 7476 Ogilsbie (1993 GE)" (2016-11-07 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
  2. ^ a b Schmadel, Lutz D. (2007). "(7476) Ogilsbie". Dictionary of Minor Planet Names – (7476) Ogilsbie. Springer Berlin Heidelberg. p. 599. doi:10.1007/978-3-540-29925-7_6508. ISBN 978-3-540-00238-3.
  3. ^ a b c d e f "LCDB Data for (7476) Ogilsbie". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
  4. ^ a b c 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. Retrieved 5 December 2016.
  5. ^ a b c d 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. Retrieved 17 May 2016.
  6. ^ a b Ferrero, Andrea (October 2010). "Lightcurve Determination of 2954 Delsemme, 3305 Ceadams and 7476 Ogilsbie". The Minor Planet Bulletin. 37 (4): 145. Bibcode:2010MPBu...37..145F. ISSN 1052-8091. Retrieved 17 May 2016.
  7. ^ a b "7476 Ogilsbie (1993 GE)". Minor Planet Center. Retrieved 1 February 2016.
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.

External linksEdit