3873 Roddy

3873 Roddy
Discovery [1]
Discovered by C. Shoemaker
Discovery site Palomar Obs.
Discovery date 21 November 1984
Designations
MPC designation 3873 Roddy
Named after
 David Roddy
(astrogeologist)[2]
1984 WB · 1953 XK1
Mars-crosser[1]
Hungaria [3][4]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 31.34 yr (11,448 days)
Aphelion 2.1454 AU
Perihelion 1.6388 AU
1.8921 AU
Eccentricity 0.1339
2.60 yr (951 days)
349.23°
0° 22m 43.32s / day
Inclination 23.354°
250.07°
267.67°
Known satellites 1 (likely)[5]
Earth MOID 0.7862 AU
Physical characteristics
Dimensions 7.51±0.25 km[6]
7.13 km (calculated)[4]
2.4782±0.05 h[7]
2.4792±0.0001 h[8]
2.4782±0.09 h[9]
2.480±0.001 h[10]
2.4797±0.00006 h[5]
2.486±0.001 h[11]
2.479±0.001 h[lower-alpha 1]
0.512±0.039[6]
0.20 (assumed)[4]
SMASS = S [1] · S [4]
12.00[6]
12.8[1]
13.1[4][12]

    3873 Roddy, provisional designation 1984 WB, is a stony Hungarian asteroid from the innermost regions of the asteroid belt, approximately 7 kilometers in diameter. It is also a Mars-crosser and a probable binary system.[5] It was discovered by American astronomer Carolyn Shoemaker at the U.S. Palomar Observatory, California, on 21 November 1984.[3]

    The S-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.6–2.1 AU once every 2 years and 7 months (951 days). Its orbit has an eccentricity of 0.13 and an inclination of 23° with respect to the ecliptic.[1] The first precovery was taken at the discovering observatory in 1953, extending the asteroid's observation arc by 31 years prior to its discovery.[3]

    According to the survey carried out by the Japanese Akari satellite, the asteroid's surface has an exceptionally high albedo of 0.51, while the Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20. AKARI infers the asteroid's diameter to measure 7.5 kilometers. CALL calculates a similar diameter of 7.1 kilometers, as the discrepancy in albedo is nearly compensated by the difference in absolute magnitude.[4][6] A large number of photometric observations by American astronomer Brian Warner at the U.S Palmer Divide Observatory in Colorado, were made to measure the asteroid's light-curve. One of the best results rendered a period of 2.4782±0.0002 hours and a variation in brightness of 0.05 in magnitude (U=3).[7] Other light-curve observations gave a similar period between 2.478 and 2.486 hours.[5][8][9][10][11][lower-alpha 1]

    While there is strong evidence for an asteroid moon orbiting Roddy, its existence is still uncertain as of 2016. Based on one observation/solution, the satellite has an orbital period of 19.24±0.02 hours and measures about 27% of Roddy's diameter, which is slightly less than 2 kilometers (Ds/Dp ratio of 0.27±0.02). However, an alternative orbital period of 23.8 hours is also possible.[5]

    The minor planet was named in after David J. Roddy (1932–2002), an American astrogeologist and authority on terrestrial impact craters at the U.S. Geological Survey. He is noted for his mathematical models of impact events and his studies on Devonian impact craters, as well as for using explosives for his field experiments.[2] Naming citation was published on 12 December 1989 (M.P.C. 15574).[13]

    References

    1. 1 2 Klinglesmith (2016) web: rotation period 2.479±0.001 hours with a brightness amplitude of 0.08 mag. LCDB assigns a Quality Code (U) of 2+. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (3873) Roddy
    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 3873 Roddy (1984 WB)" (2016-03-24 last obs.). Jet Propulsion Laboratory. Retrieved 25 May 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (3873) Roddy. Springer Berlin Heidelberg. p. 329. ISBN 978-3-540-00238-3. Retrieved 25 March 2016.
    3. 1 2 3 "3873 Roddy (1984 WB)". Minor Planet Center. Retrieved 25 March 2016.
    4. 1 2 3 4 5 6 "LCDB Data for (3873) Roddy". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016.
    5. 1 2 3 4 5 Warner, Brian D. (January 2013). "Rounding Up the Unusual Suspects". The Minor Planet Bulletin. 40 (1): 36–42. Bibcode:2013MPBu...40...36W. ISSN 1052-8091. Retrieved 1 March 2016.
    6. 1 2 3 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 1 March 2016.
    7. 1 2 Warner, Brian D. (April 2011). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2010 September-December". The Minor Planet Bulletin. 38 (2): 82–86. Bibcode:2011MPBu...38...82W. ISSN 1052-8091. Retrieved 1 March 2016.
    8. 1 2 Warner, Brian D. (June 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory - June - October 2007". The Minor Planet Bulletin. 35 (2): 56–60. Bibcode:2008MPBu...35...56W. ISSN 1052-8091. Retrieved 1 March 2016.
    9. 1 2 Warner, Brian D. (September 2006). "Asteroid lightcurve analysis at the Palmer Divide Observatory - late 2005 and early 2006". The Minor Planet Bulletin. 33 (3): 58–62. Bibcode:2006MPBu...33...58W. ISSN 1052-8091. Retrieved 1 March 2016.
    10. 1 2 Warner, Brian D. (October 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June". The Minor Planet Bulletin. 36 (4): 172–176. Bibcode:2009MPBu...36..172W. ISSN 1052-8091. Retrieved 1 March 2016.
    11. 1 2 Warner, Brian D. (January 2016). "Asteroid Lightcurve Analysis at CS3-Palmer Divide Station: 2015 June-September". The Minor Planet Bulletin. 43 (1): 57–65. Bibcode:2016MPBu...43...57W. ISSN 1052-8091. Retrieved 1 March 2016.
    12. ↑ Faure, Gerard; Garrett, Lawrence (October 2009). "Suggested Revised H Values of Selected Asteroids: Report Number 4". The Minor Planet Bulletin. 36 (4): 140–143. Bibcode:2009MPBu...36..140F. ISSN 1052-8091. Retrieved 1 March 2016.
    13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 25 May 2016.

    External links

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