23712 Willpatrick

23712 Willpatrick
Discovery [1]
Discovered by W. G. Dillon
E. R. Dillon
Discovery site George Obs.
Discovery date 1 January 1998
Designations
MPC designation 23712 Willpatrick
Named after
 William Dillon
(discoverer's son)[2]
1998 AA
main-belt · Phocaea [3]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 61.95 yr (22,629 days)
Aphelion 2.9618 AU
Perihelion 1.7878 AU
2.3748 AU
Eccentricity 0.2471
3.66 yr (1,337 days)
54.058°
0° 16m 9.48s / day
Inclination 23.492°
246.43°
85.302°
Physical characteristics
Dimensions 7.660±0.187 km[4]
5.28 km (calculated)[3]
3.902±0.005 h[5]
0.1198±0.0272[4]
0.23 (assumed)[3]
S [3]
13.6[1][3]
13.5[4]
13.85±0.23[6]

    23712 Willpatrick, provisional designation 1998 AA, is an eccentric, stony Phocaea asteroid from the inner regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered by American astronomers W. G. and E. R. Dillon at the U.S. George Observatory (735) Needville, Texas, on 1 January 1998.[7]

    The stony S-type asteroid is a member of the Phocaea family, a group of asteroids with similar orbital characteristics.[3] It orbits the Sun at a distance of 1.8–3.0 AU once every 3 years and 8 months (1,337 days). Its orbit has an eccentricity of 0.25 and an inclination of 23° with respect to the plane of the ecliptic.[1] Due to a precovery obtained by Palomar's Digitized Sky Survey in 1954, the asteroid's observation arc begins decades before its actual discovery.[7]

    A photometric light-curve analysis at the U.S. Palmer Divide Observatory (716) in 2004, rendered a well-defined rotation period of 3.902±0.005 hours with a brightness amplitude of 0.40 in magnitude (U=3).[5] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 7.7 kilometers in diameter and its surface has an albedo of 0.12,[4] while the Collaborative Asteroid Lightcurve Link (CALL) assumes a higher albedo of 0.23 and calculates a diameter of 5.3 kilometers.[3]

    The minor planet was named after the discoverer's son, William Patrick Dillon (b. 1992), who was present on the night this minor planet was discovered. His words "Daddy, I want to go home now. This place is cold and spooky." made it into the naming citation of the Minor Planet Circulars (MPCs).[2]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 23712 Willpatrick (1998 AA)" (2015-12-18 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (23712) Willpatrick, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 186. ISBN 978-3-540-34360-8. Retrieved January 2016.
    3. 1 2 3 4 5 6 7 "LCDB Data for (23712) Willpatrick". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. 1 2 3 4 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. Retrieved January 2016.
    5. 1 2 Warner, Brian D. (June 2005). "Asteroid lightcurve analysis at the Palmer Divide Observatory - fall 2004". The Minor Planet Bulletin 32 (2): 29–32. Bibcode:2005MPBu...32...29W. ISSN 1052-8091. Retrieved January 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 April 2016.
    7. 1 2 "23712 Willpatrick (1998 AA)". Minor Planet Center. Retrieved January 2016.

    External links


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