1663 van den Bos

1663 van den Bos, provisional designation 1926 PE, is a stony Florian asteroid and an exceptionally slow rotator from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 4 August 1926, by English astronomer Harry Edwin Wood at Johannesburg Observatory in South Africa.[12] It was later named after astronomer Willem Hendrik van den Bos.[2]

1663 van den Bos
van den Bos modeled from its lightcurve
Discovery [1]
Discovered byH. E. Wood
Discovery siteJohannesburg Obs.
Discovery date4 August 1926
Designations
(1663) van den Bos
Named after
Willem van den Bos
(astronomer)[2]
1926 PE · 1928 DD
1936 OM · 1948 BE
1948 EG1 · 1949 KE
1950 XD · 1963 SC
main-belt · Flora [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc88.62 yr (32,370 days)
Aphelion2.6437 AU
Perihelion1.8357 AU
2.2397 AU
Eccentricity0.1804
3.35 yr (1,224 days)
33.128°
0° 17m 38.76s / day
Inclination5.3617°
83.196°
275.24°
Physical characteristics
Dimensions7.58±0.67 km[4]
11.697±0.048 km[5]
12.25 km (derived)[3]
13.537±0.339 km[6]
155±5 h (wrong)[7]
740±10 h[8][9]
0.1708±0.0178[5]
0.184±0.025[6]
0.2045 (derived)[3]
0.255±0.022[10]
0.406±0.074[4]
S [3][11]
11.80[6] · 11.86±0.28[11] · 11.9[1][3] · 12.2[4][5]

    Orbit and classification

    The S-type asteroid is a member of the Flora family, a large group of stony asteroids in the main-belt. It orbits the Sun at a distance of 1.8–2.6 AU once every 3 years and 4 months (1,224 days). Its orbit has an eccentricity of 0.18 and an inclination of 5° with respect to the ecliptic.[1]

    In March 2082, van den Bos will pass 29 Amphitrite at a distance of 0.0065 AU (972,000 km). The body's observation arc begins with a post-recovery observation taken at Johannesburg in 1936, when it was also identified as 1936 OM, which is a full decade after its official discovery observation from 1926.[12]

    Physical characteristics

    Slow rotator

    In October 2010, a rotational lightcurve of van den Bos was obtained from photometric observations by astronomers Robert Stephens and David Higgins. It gave a rotation period of 740 hours with a brightness variation of 0.80 magnitude (U=3-).[8][9] It is one of the slowest rotating minor planets (see list) and a suspected tumbler, that has a non-principal axis rotation. At the same time, photometric observations at the Shadowbox Observatory gave an alternative, yet ambiguous period of 155 hours with an amplitude of 0.5 magnitude (U=1).[7]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, van den Bos measures between 7.58 and 13.54 kilometers in diameter, and its surface has an albedo between 0.171 and 0.255.[4][5][6][10] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.2045 and a diameter of 12.25 kilometers using an absolute magnitude of 11.9.[3]

    Naming

    This minor planet was named in honor of Dutch-born, South African astronomer Willem Hendrik van den Bos (1896–1974), former director of the Union Observatory (1941–1956) and president of the Astronomical Society of South Africa (1943–1955). He made visual micrometric observations and discovered thousands of double stars.[2] The official naming citation was published by the Minor Planet Center on 1 July 1972 (M.P.C. 3297).[13]

    References
    1. "JPL Small-Body Database Browser: 1663 van den Bos (1926 PE)" (2016-10-09 last obs.). Jet Propulsion Laboratory. Retrieved 6 June 2017.
    2. Schmadel, Lutz D. (2007). "(1663) van den Bos". Dictionary of Minor Planet Names – (1663) van den Bos. Springer Berlin Heidelberg. p. 132. doi:10.1007/978-3-540-29925-7_1664. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1663) van den Bos". Asteroid Lightcurve Database (LCDB). Retrieved 23 December 2016.
    4. 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 17 October 2019. (online, AcuA catalog p. 153)
    5. 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.
    6. 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 23 December 2016.
    7. Ruthroff, John C. (April 2011). "Lightcurve Analysis of Eight Main-belt Asteroids and a Revised Period for 185 Eunike". The Minor Planet Bulletin. 38 (2): 86–88. Bibcode:2011MPBu...38...86R. ISSN 1052-8091. Retrieved 23 December 2016.
    8. Stephens, Robert D.; Higgins, D. (April 2011). "The Lightcurve for the Long-period Asteroid 1663 van den Bos". The Minor Planet Bulletin. 38 (2): 72. Bibcode:2011MPBu...38...72S. ISSN 1052-8091. Retrieved 23 December 2016.
    9. Stephens, Robert D. (July 2011). "Asteroids Observed from GMARS and Santana Observatories: 2011 January-March". The Minor Planet Bulletin. 38 (3): 165–166. Bibcode:2011MPBu...38..165S. ISSN 1052-8091. Retrieved 23 December 2016.
    10. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 23 December 2016.
    11. 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 23 December 2016.
    12. "1663 van den Bos (1926 PE)". Minor Planet Center. Retrieved 23 December 2016.
    13. 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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