1663 van den Bos

1663 van den Bos
Discovery [1]
Discovered by H. E. Wood
Discovery site Johannesburg Obs.
Discovery date 4 August 1926
Designations
MPC designation 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 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 88.05 yr (32162 days)
Aphelion 2.6429 AU (395.37 Gm)
Perihelion 1.8364 AU (274.72 Gm)
2.2396 AU (335.04 Gm)
Eccentricity 0.18005
3.35 yr (1224.2 d)
216.66°
0° 17m 38.616s / day
Inclination 5.3614°
83.204°
275.24°
Earth MOID 0.840343 AU (125.7135 Gm)
Jupiter MOID 2.80494 AU (419.613 Gm)
Jupiter Tisserand parameter 3.608
Physical characteristics
Dimensions 12.13 km
7.58±0.67 km[4]
11.697±0.048 km[5]
13.54±0.34 km[6]
12.25 km (derived)[3]
Mean radius
 6.065 ± 0.4 km
740 h (31 d)[1][7][8]
155±5 h[9]
0.1584
0.406±0.074[4]
0.1708±0.0178[5]
0.184±0.025[6]
0.2045 (derived)[3]
0.1584 ± 0.024[1]
S [3]
11.9

    1663 van den Bos, provisional designation 1926 PE, is a stony asteroid and an exceptionally slow rotator from the inner regions of the asteroid belt, about 12 kilometers in diameter. It was discovered on 4 August 1926 by English astronomer Harry Edwin Wood at Union Observatory in Johannesburg, South Africa.[10]

    The 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 (1,225 days). Its orbit shows an eccentricity of 0.18 and is tilted by 5 degrees to the plane of the ecliptic. Repeated photometric light-curve observations in 2010, unveiled an outstandingly long rotation period of 740 hours for the asteroid.[7][8] An alternative period of 155±5 hours has also been measured in the same year.[9] A geometric albedo of about 0.16 was measured for the S-type asteroid by the Akari and WISE/NEOWISE mission.[4][5][6]

    It 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]


    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 1663 van den Bos (1926 PE)" (2015-04-23 last obs.). Jet Propulsion Laboratory. Retrieved 22 April 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (1663) van den Bos. Springer Berlin Heidelberg. p. 132. ISBN 978-3-540-29925-7. Retrieved November 2015.
    3. 1 2 3 4 "LCDB Data for (1663) van den Bos". Asteroid Lightcurve Database (LCDB). Retrieved November 2015.
    4. 1 2 3 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; 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 November 2015.
    5. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; 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. Retrieved November 2015.
    6. 1 2 3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; 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 November 2015.
    7. 1 2 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 November 2015.
    8. 1 2 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 November 2015.
    9. 1 2 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 November 2015.
    10. ↑ "1663 van den Bos (1926 PE)". Minor Planet Center. Retrieved November 2015.

    External links


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