9903 Leonhardt

9903 Leonhardt, provisional designation 1997 NA1, is a dark asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter.

9903 Leonhardt
Orbit of Leonhardt (blue), with the inner planets and Jupiter (outermost)
Discovery [1]
Discovered byP. G. Comba
Discovery sitePrescott Obs.
Discovery date4 July 1997
Designations
(9903) Leonhardt
Named after
Gustav Leonhardt
(conductor and harpsichordist)[2]
1997 NA1 · 1976 UG6
main-belt [1][3] · (outer)
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc40.43 yr (14,767 days)
Aphelion3.8232 AU
Perihelion2.3527 AU
3.0880 AU
Eccentricity0.2381
5.43 yr (1,982 days)
240.21°
0° 10m 53.76s / day
Inclination1.6903°
195.95°
139.13°
Physical characteristics
Dimensions8.499±0.240 km[4]
17.8 km[5]
0.042±0.008[4]
14.5[1]

    The asteroid was discovered on 4 July 1997, by American amateur astronomer Paul Comba at Prescott Observatory in Arizona, United States.[3] It was named after Dutch keyboard player Gustav Leonhardt.[2]

    Orbit and classification

    Leonhardt orbits the Sun in the outer main-belt at a distance of 2.4–3.8 AU once every 5 years and 5 months (1,982 days). Its orbit has an eccentricity of 0.24 and an inclination of 2° with respect to the ecliptic.[1]

    It was first identified as 1976 UG6 at Kiso Observatory in 1976, extending the body's observation arc by 21 years prior to its official discovery observation at Prescott.[3]

    Physical characteristics

    Diameter and albedo

    According to the surveys carried out by the Infrared Astronomical Satellite IRAS and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Leonhardt measures 17.8 and 8.499 kilometers in diameter, respectively.[4][5] WISE/NEOWISE also gives an albedo of 0.042 for the body's surface.[4] It has an absolute magnitude of 14.5.[1]

    Lightcurves

    As of 2017, the asteroid's rotation period and shape remain unknown.[1][6]

    Naming

    This minor planet was named for Gustav Leonhardt (1928–2012), a Dutch conductor and harpsichordist, who founded the Leonhardt Baroque Ensemble. He was known for his many international concert tours and for his large number of recorded baroque works.[2] The official naming citation was published by the Minor Planet Center on 2 April 1999 (M.P.C. 34356).[7]

    The main-belt asteroid 12637 Gustavleonhardt, discovered during the second Palomar–Leiden Trojan survey campaign in 1973, is also named in his honor.[8]

    gollark: Er, sequences of musical notes.
    gollark: There was also that copyright thing about musical notes recently.
    gollark: At least 3 numbers, I'd say.
    gollark: Which isn't really a big problem in practice, since the chance of running into sufficiently large numbers by accident is basically zero.
    gollark: An interesting consequence of intellectual property and stuff is that since binary data (some of which is copyrighted) is isomorphic to very big numbers, some numbers can't be legally distributed (by everyone).

    References
    1. "JPL Small-Body Database Browser: 9903 Leonhardt (1997 NA1)" (2017-03-28 last obs.). Jet Propulsion Laboratory. Retrieved 22 June 2017.
    2. Schmadel, Lutz D. (2007). "(9903) Leonhardt". Dictionary of Minor Planet Names – (9903) Leonhardt. Springer Berlin Heidelberg. p. 712. doi:10.1007/978-3-540-29925-7_7742. ISBN 978-3-540-00238-3.
    3. "9903 Leonhardt (1997 NA1)". Minor Planet Center. Retrieved 17 March 2017.
    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 17 March 2017.
    5. Tedesco E.F.; Noah P.V.; Noah M.; Price S.D. "The supplemental IRAS minor planet survey (SIMPS)".
    6. "LCDB Data for (9903) Leonhardt". Asteroid Lightcurve Database (LCDB). Retrieved 17 March 2017.
    7. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 March 2017.
    8. "12637 Gustavleonhardt (1053 T-2)". Minor Planet Center. Retrieved 17 March 2017.

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