9223 Leifandersson

9223 Leifandersson
Discovery [1]
Discovered bySpacewatch
Discovery siteKitt Peak National Obs.
Discovery date18 December 1995
(9223) Leifandersson
Named after
Leif Erland Andersson[2][3]
(Swedish astronomer)
1995 YY7 · 1949 QK1
1981 UD5 · 1988 VT10
1990 FD4 · 1991 RK
main-belt · Flora[4]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc67.50 yr (24,655 days)
Aphelion2.4626 AU
Perihelion2.1386 AU
2.3006 AU
3.49 yr (1,275 days)
0° 16m 57s / day
Physical characteristics
Dimensions4.498±0.176 km[7][8]
4.64 km (calculated)[4]
3.758±0.0014 h[9]
0.24 (assumed)[4]
S (assumed)[4]
13.384±0.003 (R)[9] · 13.4[8] · 13.6[1] · 13.83[4]

9223 Leifandersson, provisional designation 1995 YY7, is a background asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered on 18 December 1995, by astronomers of the Spacewatch program at Kitt Peak National Observatory in Arizona, United States. The asteroid was named in memory of Swedish astronomer Leif Erland Andersson.[2] The assumed stony asteroid has a rotation period of 3.758 hours.[4]

Orbit and classification[]

Leifandersson is a non-family asteroid of the main belt's background population when applying the Hierarchical Clustering Method to its proper orbital elements.[5][6] It has also been classified as a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[4] It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.5 AU once every 3 years and 6 months (1,275 days; semi-major axis of 2.30 AU). Its orbit has an eccentricity of 0.07 and an inclination of 3° with respect to the ecliptic.[1]

The body's observation arc begins with its first observation as 1949 QK1 at Goethe Link Observatory in August 1948, or more than 47 years prior to its official discovery observation at Kitt Peak.[2]

Physical characteristics[]

Leifandersson is an assumed stony S-type asteroid.[4]

Rotation period[]

In February 2011, a rotational lightcurve of Leifandersson was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 3.758 hours with a brightness amplitude of 0.33 magnitude (U=2).[9]

Diameter and albedo[]

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Leifandersson measures 4.498 kilometers in diameter and its surface has an albedo of 0.3810.[7][8] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the parent body of the Flora family – and calculates a diameter of 4.64 kilometers based on an absolute magnitude of 13.83.[4]


This minor planet was named after Swedish astronomer Leif Erland Andersson (1943–1979), who calculated the first observable transits of Pluto and Charon and also co-produced a catalogue of lunar craters. The approved naming citation was published by the Minor Planet Center on 24 January 2000 (M.P.C. 38198).[2][10] The lunar crater Andersson was also named in his memory.[3][11]


  1. ^ a b c d "JPL Small-Body Database Browser: 9223 Leifandersson (1995 YY7)" (2017-02-26 last obs.). Jet Propulsion Laboratory. Retrieved 4 January 2018.
  2. ^ a b c d "9223 Leifandersson (1995 YY7)". Minor Planet Center. Retrieved 4 January 2018.
  3. ^ a b Schmadel, Lutz D. (2007). "(9223) Leifandersson". Dictionary of Minor Planet Names – (9223) Leifandersson. Springer Berlin Heidelberg. p. 683. doi:10.1007/978-3-540-29925-7_7418. ISBN 978-3-540-00238-3.
  4. ^ a b c d e f g h i "LCDB Data for (9223) Leifandersson". Asteroid Lightcurve Database (LCDB). Retrieved 4 January 2018.
  5. ^ a b "Small Bodies Data Ferret". Nesvorny HCM Asteroid Families V3.0. Archived from the original on 2 August 2017. Retrieved 4 January 2018.
  6. ^ a b "Asteroid 9223 Leifandersson – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
  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. S2CID 118745497. Retrieved 4 January 2018.
  8. ^ 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. S2CID 118700974.
  9. ^ a b c Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. S2CID 8342929. Retrieved 4 January 2018.
  10. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 4 January 2018.
  11. ^ "Planetary Names: Crater, craters: Andersson on Moon". Gazetteer of Planetary Nomenclature. USGS Astrogeology Research Program.

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