9260 Edwardolson

9260 Edwardolson
Discovery [1]
Discovered byIndiana University
(Indiana Asteroid Program)
Discovery siteGoethe Link Obs.
Discovery date8 October 1953
(9260) Edwardolson
Named after
Edward C. Olson
1953 TA1 · 1991 QH
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc63.48 yr (23,185 days)
Aphelion2.8164 AU
Perihelion1.7638 AU
2.2901 AU
3.47 yr (1,266 days)
0° 17m 3.84s / day
Known satellites1 [a][4]
Physical characteristics
Dimensions4.05 km (taken)[3]
4.052 km[5]
4.115±0.362 km[6][7]
3.0852±0.0001 h[8]
14.0[6] · 14.1[1] · 14.54±0.086[5][3]

9260 Edwardolson, provisional designation 1953 TA1, is a Florian binary[a] asteroid from the inner regions of the asteroid belt, approximately 4.1 kilometers in diameter. It was discovered on 8 October 1953, by Indiana University during its Indiana Asteroid Program at Goethe Link Observatory in Brooklyn, Indiana, United States.[9] It was named for American astronomer Edward Olson.[2]

Classification and orbit[]

Edwardolson is a member of the Flora family, one of the largest families of stony asteroids. It orbits the Sun in the inner main-belt at a distance of 1.8–2.8 AU once every 3 years and 6 months (1,266 days). Its orbit has an eccentricity of 0.23 and an inclination of 5° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc begins with its official discovery observation in 1953.[9]

Diameter, albedo and rotation[]

A rotational lightcurve of Edwardolson was obtained from photometric observations in several locations including the Slovakian Skalnaté pleso Observatory. It rendered a rotation period of 3.0852±0.0001 hours with a low brightness variation of 0.11 in magnitude, which suggests that the body has a nearly spheroidal shape (U=n/a).[8] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid has an albedo of 0.26 and 0.16, and an respective absolute magnitude of 14.0 and 14.54. Both data sets converge to a diameter of 4.1 kilometers.[5][6][7]


A minor-planet moon orbiting Edwardolson was discovered in 2005, making it a binary system. The satellite has a fairly short orbital period of 17 hours, 47 minutes, and 2 seconds (17.785±0.003 hours),[4] and an estimated mean-diameter ratio of 0.27±0.03, which would give the satellite a diameter of approximately 1.0 to 1.3 kilometers.[a]


This minor planet was named in honor of American astronomer Edward C. Olson (born 1930) of the University of Illinois whose observations explained the distortion of the outer layers of mass-gaining stars, and how their rotation can come close to the stability limit during the involved mass-transfer process and the preserved angular momentum.[2] Olson was also an active member of the International Astronomical Union, affiliated with its Division G Stars and Stellar Physics.[10] The approved naming citation was published by the Minor Planet Center on 13 July 2004 (M.P.C. 52322).[11]


  1. ^ a b c Central Bureau for Astronomical Telegrams, No.270, 2 November 2005, for (9260) Edwardolson
    A photometric observations between 6 and 30 October 2005, show that 9260 Edwardolson is a binary system with an orbital period of 17.785±0.003 hours. The primary rotates with a period of 3.0852±0.0001 hours, and its lightcurve has a brightness variation of 0.11 magnitude, which is indicative of a nearly spheroidal shape. Mutual eclipse/occultation events, that are between 0.08 and 0.15 magnitude deep, indicate a secondary-to-primary mean-diameter ratio of 0.27±0.03.
    Reported by M. Jakubik and M. Husarik, Skalnate Pleso Observatory; J. Vilagi, S. Gajdos, and A. Galad, Modra Observatory; P. Pravec and P. Kusnirak, Ondrejov Observatory; W. Cooney, J. Gross and D. Terrell via Sonoita Research Observatory (Sonoita, AZ); D. Pray, Greene, RI; and R. Stephens, Yucca Valley, CA
    Central Bureau for Astronomical Telegrams


  1. ^ a b c d "JPL Small-Body Database Browser: 9260 Edwardolson (1953 TA1)" (2017-03-31 last obs.). Jet Propulsion Laboratory. Retrieved 5 July 2017.
  2. ^ a b c Schmadel, Lutz D. (2006). "(9260) Edwardolson [2.29, 0.23, 5.1]". Dictionary of Minor Planet Names – (9260) Edwardolson, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 44. doi:10.1007/978-3-540-34361-5_334. ISBN 978-3-540-34361-5.
  3. ^ a b c d "LCDB Data for (9260) Edwardolson". Asteroid Lightcurve Database (LCDB). Retrieved 24 July 2016.
  4. ^ a b Johnston, Robert. "(9260) Edwardolson". johnstonsarchive.net. Retrieved 1 January 2016.
  5. ^ a b c d Pravec, Petr; Harris, Alan W.; Kusnirák, Peter; Galád, Adrián; Hornoch, Kamil (September 2012). "Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations". Icarus. 221 (1): 365–387. Bibcode:2012Icar..221..365P. doi:10.1016/j.icarus.2012.07.026. Retrieved 1 January 2016.
  6. ^ 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 24 July 2016.
  7. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016.
  8. ^ a b Jakubik, M.; Husarik, M.; Vilagi, J.; Gajdos, S.; Galad, A.; Pravec, P.; et al. (November 2005). "(9260) Edwardolson". Central Bureau Electronic Telegrams. 270 (270): 1. Bibcode:2005CBET..270....1J. Retrieved 1 January 2016.
  9. ^ a b "9260 Edwardolson (1953 TA1)". Minor Planet Center. Retrieved 24 July 2016.
  10. ^ "Edward C. Olson". IAU – International Astronomical Union. Retrieved 1 January 2016.
  11. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 July 2016.

External links[]