18117 Jonhodge

18117 Jonhodge, provisional designation 2000 NY23, is a bright background asteroid from the inner regions of the asteroid belt, approximately 3 kilometers in diameter. It was discovered on 5 July 2000, by astronomer of the Lowell Observatory Near-Earth Object Search at Anderson Mesa Station near Flagstaff, Arizona, in the United States.[5] The asteroid was named after American teacher Jonathon Hodge.[2]

18117 Jonhodge
Discovery [1]
Discovered byLONEOS
Discovery siteAnderson Mesa Stn.
Discovery date5 July 2000
Designations
(18117) Jonhodge
Named after
Jonathon Hodge [2]
(American teacher)
2000 NY23 · 1993 RK8
1997 WU27 · 1999 FB22
main-belt · (inner)
background [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc23.63 yr (8,630 days)
Aphelion2.5586 AU
Perihelion2.1464 AU
2.3525 AU
Eccentricity0.0876
3.61 yr (1,318 days)
312.54°
0° 16m 23.52s / day
Inclination1.1404°
274.79°
347.25°
Physical characteristics
Dimensions3.155±0.099 km[4]
0.407±0.038[4]
14.6[1]

    Orbit and classification

    Jonhodge is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the inner main-belt at a distance of 2.1–2.6 AU once every 3 years and 7 months (1,318 days). Its orbit has an eccentricity of 0.09 and an inclination of 1° with respect to the ecliptic.[1]

    The body's observation arc begins with its first identification as 1993 RK8 at La Silla Observatory in September 1993, almost 7 years prior to its official discovery observation at Anderson Mesa.[5]

    Physical characteristics

    The asteroid's spectral type is unknown.[1] Based to its high albedo (see below), it is likely of a stony rather than carbonaceous composition.

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Jonhodge measures 3.155 kilometers in diameter and its surface has a high albedo of 0.407.[4]

    Photometry

    As of 2017, no rotational lightcurve of Jonhodge has been obtained from photometric observations. The body's rotation period, poles and shape remain unknown.[6]

    Naming

    This minor planet was named after Jonathon Hodge ("Jon Hodge") (born 1948 – January 4, 2006), a teacher of astronomy and science to college students, schoolchildren and the general public.[2] The official naming citation was published by the Minor Planet Center on 15 December 2005 (M.P.C. 55722).[7] Proposal for asteroid honor by Thor Dockweiler to Simon P. Balm (UCLA and Santa Monica College), who then submitted it to Donald Keith Yeomans at the JPL.

    Jonathon Hodge

    Hodge taught at Santa Monica College and served as the director (1976–2005) of the Santa Monica College Planetarium (now Drescher Planetarium), following an earlier period as a regular lecturer at the Griffith Observatory in Los Angeles. Hodge also coordinated an annual astronomical lecture series at the University of California, Los Angeles (UCLA). Hodge, along with astronomy professor "Woody" Sobel (Heywood Sobel), was instrumental in encouraging Robert P. Lozano to establish the Santa Monica Amateur Astronomy Club in 1981. Hodge was a member of the Astronomical Society of the Pacific and the International Planetarium Society. Hodge in his younger years majored in astronomy and graduated from the University of Southern California in Los Angeles with a degree in the history of medieval science, a side interest that would serve him well during his career in education and planetariums.

    References
    1. "JPL Small-Body Database Browser: 18117 Jonhodge (2000 NY23)" (2017-05-01 last obs.). Jet Propulsion Laboratory. Retrieved 24 October 2017.
    2. Schmadel, Lutz D. (2006). "(18117) Jonhodge [2.35, 0.09, 1.1]". Dictionary of Minor Planet Names – (18117) Jonhodge, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 119. doi:10.1007/978-3-540-34361-5_1291. ISBN 978-3-540-34361-5.
    3. "Asteroid 18117 Jonhodge – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    4. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 24 October 2017.
    5. "18117 Jonhodge (2000 NY23)". Minor Planet Center. Retrieved 24 October 2017.
    6. "LCDB Data for (18117) Jonhodge". Asteroid Lightcurve Database (LCDB). Retrieved 24 October 2017.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 24 October 2017.
    • History of the Santa Monica Amateur Astronomy Club: A Beginning – First Edition, Chapter 4: "Gentleman Extraordinaire – The Legacy of Jonathan T. Hodge", 2006, ISBN 0-9788745-5-2.

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