1983 Bok

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1983 Bok
Discovery [1]
Discovered by E. Roemer
Discovery site Catalina Stn.
Discovery date 9 June 1975
MPC designation 1983 Bok
Named after
Bart Bok and
Priscilla Fairfield Bok[2]
1975 LB · 1950 RV
1963 UJ
main-belt · (middle)[3]
Orbital characteristics[1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 65.73 yr (24,008 days)
Aphelion 2.8802 AU
Perihelion 2.3651 AU
2.6226 AU
Eccentricity 0.0982
4.25 yr (1,551 days)
0° 13m 55.56s / day
Inclination 9.4136°
Physical characteristics
Dimensions 10.08 km (calculated)[3]
15±3 km[4]
15.70±0.24 km[5]
10.70±0.01 h[4]
0.10 (assumed)[3]
S[3] · C[4]
12.83±0.10[4] · 13.1[1][3] · 13.10±0.22[6] · 13.32[5]

1983 Bok, provisional designation 1975 LB, is a dark asteroid from the middle region of the asteroid belt, approximately 15 kilometers in diameter. It was discovered on 9 June 1975, by American astronomer Elizabeth Roemer at the Catalina Station of the UA's Steward Observatory in Tucson, Arizona.[7]

The presumed C-type asteroid is also classified as a S-type, despite its low albedo of less than 0.1.[3][4] It orbits the Sun at a distance of 2.4–2.9 AU once every 4 years and 3 months (1,551 days). Its orbit has an eccentricity of 0.10 and an inclination of 9° with respect to the ecliptic.[1] The first observation was taken at the Argentinian La Plata Astronomical Observatory in 1950, extending the asteroid's observation arc by 25 years prior to its discovery.[7]

In October 2014, the first rotational light-curve for this body was obtained by Italian astronomer Giovanni Battitsa Casalnuovo at the Eurac Observatory (IAU code#C62) in Bolzano, Italy. It gave a well-defined rotation period of 10.70±0.01 hours with a relatively high brightness variation of 0.46 in magnitude (U=3-).[4] The Italian astronomer also calculated an albedo of 0.06 for its surface and a diameter of 15±3 kilometers, in agreement with the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer which gave a diameter of 15.7 kilometers and an albedo of 0.034.[5] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.10 and consequently calculates a much smaller diameter of 10.08 kilometers.[3]

The minor planet was named after the Duch-born astronomer couple Bart Bok (1906–1983) and Priscilla Fairfield Bok (1896–1975), in recognition for their contribution to astrometry of small Solar System bodies. Both astronomers studied the structure of the southern Milky Way and fostered astronomy in the Southern Hemisphere. This asteroid was the first numbered discovery made with the Stewart Observatory's 90-inch Bok Telescope. The body's name was proposed by the discovering astronomer and by Alan C. Gilmore from New Zealand.[2] Naming citation was published before November 1977 (M.P.C. 4158).[8]


  1. ^ a b c d "JPL Small-Body Database Browser: 1983 Bok (1975 LB)" (2016-06-06 last obs.). Jet Propulsion Laboratory. Retrieved 8 December 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (1983) Bok. Springer Berlin Heidelberg. p. 160. ISBN 978-3-540-00238-3. Retrieved 25 October 2016. 
  3. ^ a b c d e f g "LCDB Data for (1983) Bok". Asteroid Lightcurve Database (LCDB). Retrieved 25 October 2016. 
  4. ^ a b c d e f g Casalnuovo, Giovanni Battitsa (April 2015). "Lightcurve Analysis for Seven Main-belt Asteroids". The Minor Planet Bulletin. 42 (2): 139–141. Bibcode:2015MPBu...42..139C. ISSN 1052-8091. Retrieved 25 October 2016. 
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794Freely accessible. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 25 October 2016. 
  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. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 October 2016. 
  7. ^ a b "1983 Bok (1975 LB)". Minor Planet Center. Retrieved 25 October 2016. 
  8. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 October 2016. 

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