9903 Leonhardt
{{Short description|Asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 9903 Leonhardt
| background = #D6D6D6
| image = AnimatedOrbitOf9903Leonhardt.gif
| image_scale =
| caption = {{longitem|Orbit of Leonhardt (blue), with the inner planets and Jupiter (outermost)}}
| discovered = 4 July 1997
| discoverer = P. G. Comba
| discovery_site = Prescott Obs.
| mpc_name = (9903) Leonhardt
| alt_names = {{mp|1997 NA|1}}{{·}}{{mp|1976 UG|6}}
| pronounced =
| named_after = Gustav Leonhardt
{{nowrap|{{small|(conductor and harpsichordist)}}}}
| mp_category = main-belt{{·}}{{small|(outer)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 40.43 yr (14,767 days)
| aphelion = 3.8232 AU
| perihelion = 2.3527 AU
| semimajor = 3.0880 AU
| eccentricity = 0.2381
| period = 5.43 yr (1,982 days)
| mean_anomaly = 240.21°
| mean_motion = {{Deg2DMS|0.1816|sup=ms}} / day
| inclination = 1.6903°
| asc_node = 195.95°
| arg_peri = 139.13°
| dimensions = {{val|8.499|0.240}} km
17.8 km
| rotation =
| albedo = {{val|0.042|0.008}}
| spectral_type =
}}
9903 Leonhardt, provisional designation {{mp|1997 NA|1}}, is a dark asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter.
The asteroid was discovered on 4 July 1997, by American amateur astronomer Paul Comba at Prescott Observatory in Arizona, United States. It was named after Dutch keyboard player Gustav Leonhardt.
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.
It was first identified as {{mp|1976 UG|6}} at Kiso Observatory in 1976, extending the body's observation arc by 21 years prior to its official discovery observation at Prescott.
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. WISE/NEOWISE also gives an albedo of 0.042 for the body's surface. It has an absolute magnitude of 14.5.
= Lightcurves =
As of 2017, the asteroid's rotation period and shape remain unknown.
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. The official naming citation was published by the Minor Planet Center on 2 April 1999 ({{small|M.P.C. 34356}}).
The main-belt asteroid 12637 Gustavleonhardt, discovered during the second Palomar–Leiden Trojan survey campaign in 1973, is also named in his honor.
{{clear|left}}
References
{{reflist|refs=
|type = 2017-03-28 last obs.
|title = JPL Small-Body Database Browser: 9903 Leonhardt (1997 NA1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009903
|publisher = Jet Propulsion Laboratory
|access-date = 22 June 2017}}
|title = Dictionary of Minor Planet Names – (9903) Leonhardt
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 712
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_7742 |chapter = (9903) Leonhardt }}
|title = 9903 Leonhardt (1997 NA1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=9903
|access-date = 17 March 2017}}
|title = 12637 Gustavleonhardt (1053 T-2)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=12637
|access-date = 17 March 2017}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 March 2017}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 17 March 2017}}
|title = LCDB Data for (9903) Leonhardt
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=9903%7CLeonhardt
|access-date = 17 March 2017}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
- {{AstDys|9903}}
- {{JPL small body}}
{{Minor planets navigator |9902 Kirkpatrick |number=9903 |9904 Mauratombelli}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Leonhardt}}