1983 Bok

1983 Bok (prov. designation: 1975 LB) is a dark background asteroid from the central region of the asteroid belt. 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, and named for Bart Bok and Priscilla Fairfield Bok.[2][7] The carbonaceous C-type asteroid has a rotation period of 10.7 hours and measures approximately 15 kilometers (9.3 miles) in diameter.

1983 Bok
Modelled shape of Bok from its lightcurve
Discovery [1]
Discovered byE. Roemer
Discovery siteCatalina Stn.
Discovery date9 June 1975
Designations
(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 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc66.73 yr (24,372 days)
Aphelion2.8796 AU
Perihelion2.3632 AU
2.6214 AU
Eccentricity0.0985
4.24 yr (1,550 days)
260.33°
0° 13m 55.92s / day
Inclination9.4133°
23.557°
346.78°
Physical characteristics
Mean diameter
10.08 km (calculated)[3]
15±3 km[4]
15.70±0.24 km[5]
10.70±0.01 h[4]
0.034±0.015[5]
0.06±0.02[4]
0.10 (assumed)[3]
C [4] · S/C [3]
12.83±0.10[4] · 13.1[1][3] · 13.10±0.22[6] · 13.32[5]

    Classification and orbit

    Bok orbits the Sun in the central main-belt at a distance of 2.4–2.9 AU once every 4 years and 3 months (1,550 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]

    Naming

    This minor planet was named after the 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.

    Bok 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] The official naming citation was published by the Minor Planet Center on 18 April 1977 (M.P.C. 4158).[8]

    Physical characteristics

    Bok has been characterized as a C-type asteroid.[4]

    In October 2014, the first rotational lightcurve for this body was obtained by Italian astronomer Giovanni Battitsa Casalnuovo at the Eurac Observatory (C62) in Bolzano, Italy. Lightcurve analysis gave a well-defined rotation period of 10.70±0.01 hours with a relatively high brightness variation of 0.46 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, a compromise value between the stony (0.20) and carbonaceous (0.057) asteroids with a semi-major axis between 2.6 and 2.7 AU, and consequently calculates a much smaller diameter of 10.08 kilometers using an absolute magnitude of 13.1.[3]

    References
    1. "JPL Small-Body Database Browser: 1983 Bok (1975 LB)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 1 July 2017.
    2. Schmadel, Lutz D. (2007). "(1983) Bok". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 160. doi:10.1007/978-3-540-29925-7_1984. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1983) Bok". Asteroid Lightcurve Database (LCDB). Retrieved 25 October 2016.
    4. Casalnuovo, Giovanni Battitsa (April 2015). "Lightcurve Analysis for Seven Main-belt Asteroids" (PDF). Minor Planet Bulletin. 42 (2): 139–141. Bibcode:2015MPBu...42..139C. ISSN 1052-8091. Retrieved 17 March 2020.
    5. 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:1209.5794. 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 25 October 2016.
    7. "1983 Bok (1975 LB)". Minor Planet Center. Retrieved 25 October 2016.
    8. Schmadel, Lutz D. "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.
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