51829 Williemccool

51829 Williemccool, provisional designation 2001 OD41, is a Vestian asteroid from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. It was discovered on 21 July 2001, by astronomers of the Near-Earth Asteroid Tracking program at Palomar Observatory in California, United States. The asteroid was named in memory of American astronaut and pilot William C. McCool, who died in the Space Shuttle Columbia disaster.[5]

51829 Williemccool
Discovery [1]
Discovered byNEAT
Discovery sitePalomar Obs.
Discovery date21 July 2001
Designations
(51829) Williemccool
Named after
William C. McCool [2]
(American astronaut)
2001 OD41 · 2000 AQ162
main-belt · (inner)
Vesta [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc21.28 yr (7,773 days)
Aphelion2.4023 AU
Perihelion2.1540 AU
2.2782 AU
Eccentricity0.0545
3.44 yr (1,256 days)
331.36°
0° 17m 11.76s / day
Inclination7.5659°
93.340°
119.31°
Physical characteristics
Dimensions1.9 km (est. at 0.40)[4]
0.40 (assumed)[4]
15.2[1]

    Orbit and classification

    Williemccool is a member of the Vesta family (401).[3] Vestian asteroids have a composition akin to cumulate eucrites (HED meteorites) and are thought to have originated deep within 4 Vesta's crust, possibly from the Rheasilvia crater, a large impact crater on its southern hemisphere near the South pole, formed as a result of a subcatastrophic collision. Vesta is the main belt's second-largest and second-most-massive body after Ceres.[6][7]

    It orbits the Sun in the inner main-belt at a distance of 2.2–2.4 AU once every 3 years and 5 months (1,256 days; semi-major axis of 2.28 AU). Its orbit has an eccentricity of 0.05 and an inclination of 8° with respect to the ecliptic.[1]

    The body's observation arc begins with a precovery taken by Spacewatch at Kitt Peak Observatory in December 1995, more than 6 years prior to its official discovery observation at Palomar.[5]

    Physical characteristics

    Rotation period

    As of 2017, no rotational lightcurve of Williemccool has been obtained from photometric observations. The asteroid's rotation period, poles and shape remain unknown.[1][8]

    Diameter and albedo

    Williemccool has not been observed by any of the space-based surveys such as the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, IRAS or the Akari satellite.[1] A generic magnitude-to-diameter conversion gives a diameter of 1.9 kilometers based on an absolute magnitude of 15.2 and an assumed albedo 0.40, typical for members of the Vesta family.[4]

    Naming

    This minor planet was named in memory of William Cameron McCool (1961–2003), an American astronaut and pilot of STS-107, who died in the Space Shuttle Columbia disaster on 1 February 2003. The approved naming citation was published by the Minor Planet Center on 6 August 2003 (M.P.C. 49283).[9]

    The following asteroids were named in memory of the other six Columbia crew members: 51823 Rickhusband, 51824 Mikeanderson, 51825 Davidbrown, 51826 Kalpanachawla, 51827 Laurelclark and 51828 Ilanramon.[2]

    References
    1. "JPL Small-Body Database Browser: 51829 Williemccool (2001 OD41)" (2017-03-26 last obs.). Jet Propulsion Laboratory. Retrieved 29 December 2017.
    2. Schmadel, Lutz D. (2006). "(51829) Williemccool [2.28, 0.05, 7.6]". Dictionary of Minor Planet Names – (51829) Williemccool, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 216. doi:10.1007/978-3-540-34361-5_2558. ISBN 978-3-540-34361-5.
    3. "Asteroid 51829 Williemccool – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 27 October 2019.
    4. "Asteroid Size Estimator". CNEOS NASA/JPL. Retrieved 29 December 2017.
    5. "51829 Williemccool (2001 OD41)". Minor Planet Center. Retrieved 29 December 2017.
    6. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    7. Kelley, Michael S.; Vilas, Faith; Gaffey, Michael J.; Abell, Paul A. (September 2003). "Quantified mineralogical evidence for a common origin of 1929 Kollaa with 4 Vesta and the HED meteorites". Icarus. 165 (1): 215–218. Bibcode:2003Icar..165..215K. doi:10.1016/S0019-1035(03)00149-0. Retrieved 29 December 2017.
    8. "LCDB Data for (51829) Williemccool". Asteroid Lightcurve Database (LCDB). Retrieved 29 December 2017.
    9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 29 December 2017.

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