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2064 Thomsen

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2064 Thomsen
Discovery [1]
Discovered byL. Oterma
Discovery siteTurku Obs.
Discovery date8 September 1942
Designations
(2064) Thomsen
Named after
Ivan Leslie Thomsen
(New Zealand astronomer)[2]
1942 RQ · 1958 RO
1974 OK · 1977 FE3
1977 KA · A913 QB
Mars-crosser [1][3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc74.50 yr (27,211 days)
Aphelion2.8967 AU
Perihelion1.4600 AU
2.1783 AU
Eccentricity0.3298
3.22 yr (1,174 days)
142.30°
0° 18m 23.76s / day
Inclination5.6946°
302.16°
2.7479°
Earth MOID0.4446 AU
Physical characteristics
Dimensions8.09±0.12 km[4]
13.59 km (derived)[5]
13.61±1.6 km (IRAS:2)[6]
4.2267±0.0001 h[7]
4.233 h[8]
4.244023±0.000001 h[9]
4.253±0.005 h[10]
0.0549±0.015 (IRAS:2)[6]
0.0644 (derived)[5]
0.162±0.006[4]
SMASS = S[1] · S [5][11][12]
B–V = 0.887[1]
U–B = 0.524[1]
12.6[1] · 12.93[5][8] · 13.10[4][6][12] · 13.44±0.31[11]

2064 Thomsen, provisional designation 1942 RQ, is a stony, eccentric asteroid classified as Mars-crosser, approximately 13 kilometers in diameter. The asteroid was discovered by Finnish astronomer Liisi Oterma at Turku Observatory, Finland, on 8 September 1942.[3] It was named after New Zealand astronomer Ivan Leslie Thomsen

Orbit and classification

The S-type asteroid orbits the Sun in the inner main-belt at a distance of 1.5–2.9 AU once every 3 years and 3 months (1,174 days). Its orbit has an eccentricity of 0.33 and an inclination of 6° with respect to the ecliptic.[1]

Physical characteristics

Four rotational lightcurves gave a well-defined rotation period of 4.233 hours with a brightness variation of 0.62–0.69 magnitude (U=3/3/ .a./3)[7][8][9][10] and an albedo of 0.055 and 0.16, as measured by the IRAS and Akari surveys, respectively.[4][6]

Naming

This minor planet was named in memory of New Zealand astronomer Ivan Leslie Thomsen (1910–1969), director of the Carter Observatory, Wellington, from 1945 until he was appointed director of the Mount John University Observatory only two months before his death. He was an enthusiastic coordinator of New Zealand's astronomy and his efforts eventually led to the minor-planet observing program with the Carter Observatory 41-cm reflector. It was the 1977 rediscovery at the Carter Observatory that allowed this minor planet to be numbered.[2] The official naming citation was published by the Minor Planet Center before November 1977 (M.P.C. 4421).[13]

References

  1. ^ a b c d e f g h "JPL Small-Body Database Browser: 2064 Thomsen (1942 RQ)" (2017-03-09 last obs.). Jet Propulsion Laboratory. Retrieved 11 June 2017.
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2064) Thomsen. Springer Berlin Heidelberg. p. 167. ISBN 978-3-540-00238-3. Retrieved 8 December 2016.
  3. ^ a b "2064 Thomsen (1942 RQ)". Minor Planet Center. Retrieved 8 December 2016.
  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 8 December 2016.
  5. ^ a b c d "LCDB Data for (2064) Thomsen". Asteroid Lightcurve Database (LCDB). Retrieved 8 December 2016.
  6. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 8 December 2016.
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (2064) Thomsen". Geneva Observatory. Retrieved 8 December 2016.
  8. ^ a b c Wisniewski, W. Z. (March 1991). "Physical studies of small asteroids. I - Lightcurves and taxonomy of 10 asteroids". Icarus: 117–122. Bibcode:1991Icar...90..117W. doi:10.1016/0019-1035(91)90073-3. ISSN 0019-1035. Retrieved 8 December 2016.
  9. ^ a b Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 8 December 2016.
  10. ^ a b Warner, Brian D. (July 2015). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2014 December - 2015 March". The Minor Planet Bulletin. 42 (3): 167–172. Bibcode:2015MPBu...42..167W. ISSN 1052-8091. Retrieved 8 December 2016.
  11. ^ a b 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 8 December 2016.
  12. ^ a b Carry, B.; Solano, E.; Eggl, S.; DeMeo, F. E. (April 2016). "Spectral properties of near-Earth and Mars-crossing asteroids using Sloan photometry". Icarus. 268: 340–354. arXiv:1601.02087. Bibcode:2016Icar..268..340C. doi:10.1016/j.icarus.2015.12.047. Retrieved 8 December 2016.
  13. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 8 December 2016.
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