7336 Saunders
{{Short description|Stony asteroid and near-Earth object}}
{{Use dmy dates|date=September 2020}}
{{Infobox planet
| minorplanet = yes
| name = 7336 Saunders
| background = #FFC2E0
| image =
| image_size =
| caption =
| discovered = 6 September 1989
| discoverer = E. F. Helin
| discovery_site = Palomar Obs.
| mpc_name = (7336) Saunders
| alt_names = {{mp|1989 RS|1}}
| pronounced =
| named_after = R. Stephen Saunders
{{small|(JPL scientist)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 34.63 yr (12,647 days)
| aphelion = 3.4148 AU
| perihelion = 1.1956 AU
| semimajor = 2.3052 AU
| eccentricity = 0.4813
| period = 3.50 yr (1,278 days)
| mean_anomaly = 353.72°
| mean_motion = {{Deg2DMS|0.2816|sup=ms}} / day
| inclination = 7.1958°
| asc_node = 174.49°
| arg_peri = 181.51°
| moid = 0.1908 AU{{·}}74.3 LD
| dimensions = 0.467 km {{small|(derived)}}
| rotation = {{val|6}} h
{{val|6.423|0.004}} h{{efn|name=Pravec-2003}}
| albedo = 0.20 {{small|(assumed)}}
| spectral_type = SMASS = Sq{{·}}S
| abs_magnitude = 18.0{{·}}{{val|18.45|0.2}} {{small|(R)}}{{efn|name=Pravec-2003}}{{·}}18.8{{·}}{{val|19.02|0.112}}
}}
7336 Saunders, provisional designation {{mp|1989 RS|1}}, is a stony asteroid and near-Earth object of the Amor group, approximately 0.5 kilometers in diameter.
The asteroid was discovered on 6 September 1989, by American astronomer Eleanor Helin at Palomar Observatory in California, United States. It was named for JPL-project scientist R. Stephen Saunders.
Orbit and classification
Saunders orbits the Sun at a distance of 1.2–3.4 AU once every 3 years and 6 months (1,278 days). Its orbit has an eccentricity of 0.48 and an inclination of 7° with respect to the ecliptic.
A first precovery was taken at the Australian Siding Spring Observatory in 1982, extending the body's observation arc by 7 years prior to its official discovery at Palomar. It has a minimum orbital intersection distance with Earth of {{convert |0.1908 |AU |km |abbr=on |lk=off |sigfig=3}}, which corresponds to 74.3 lunar distances.
Physical characteristics
In the SMASS classification, Saunders is a Sq-type, which transitions from the common S-type to the Q-type asteroids. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 467 meters, based on an absolute magnitude of 19.02.
= Lightcurve =
In October 1989, the first photometric observations of Saunders were made with the ESO 1-metre telescope at La Silla in Chile. It gave a rotation period of 6 hours with a brightness variation of 0.3 magnitude ({{small|U=2}}). Another rotational lightcurve was obtained by Czech astronomer Petr Pravec at Ondřejov Observatory in August 2003, giving a period of {{val|6.423|0.004}} and an amplitude of 0.2 magnitude ({{small|U=n.a.}}).{{efn|name=Pravec-2003}}
Naming
This minor planet was named in honor of JPL-project scientist R. Stephen Saunders (born 1940), director of the RPIF and head scientist of the Solar System Exploration Office. He worked on the Mars Surveyor 2001/03 program and on the Magellan spacecraft, that visited and mapped Venus in 1990. The official naming citation was published by the Minor Planet Center on 26 July 2000 ({{small|M.P.C. 41028}}).
Notes
{{notelist|refs=
{{efn|name=Pravec-2003|1=Pravec (2003): rotation period {{val|6.423|0.004}} hours with a brightness amplitude of {{val|0.2}} mag. Summary figures for (7336) Saunders at [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7336%7CSaunders Collaborative Asteroid Lightcurve Link (CALL)] and [http://www.asu.cas.cz/~ppravec/neo.htm Pravec, P.; Wolf, M.; Sarounova, L. (2003)]}}
}}
References
{{reflist|30em|refs=
|type = 2017-06-05 last obs.
|title = JPL Small-Body Database Browser: 7336 Saunders (1989 RS1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007336
|publisher = Jet Propulsion Laboratory
|access-date = 22 June 2017}}
|title = Dictionary of Minor Planet Names – (7336) Saunders
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 591
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_6435 |chapter = (7336) Saunders }}
|title = 7336 Saunders (1989 RS1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7336
|access-date = 26 September 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 26 September 2016}}
|title = LCDB Data for (7336) Saunders
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7336%7CSaunders
|access-date = 26 September 2016}}
|first1 = Martin |last1 = Hoffmann
|first2 = Helge |last2 = Rebhan
|first3 = Gerhard |last3 = Neukum
|first4 = Edward H. |last4 = Geyer
|date = January 1993
|title = Photometric observations of four near-earth asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=1993AcA....43...61H
|journal = Acta Astronomica
|volume = 43
|pages = 61–67
|issn = 0001-5237
|bibcode = 1993AcA....43...61H
|access-date= 26 September 2016}}
|first1 = Petr |last1 = Pravec
|first2 = Alan W. |last2 = Harris
|first3 = Peter |last3 = Kusnirák
|first4 = Adrián |last4 = Galád
|first5 = Kamil |last5 = Hornoch
|date = September 2012
|title = Absolute magnitudes of asteroids and a revision of asteroid albedo estimates from WISE thermal observations
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012Icar..221..365P
|journal = Icarus
|volume = 221
|issue = 1
|pages = 365–387
|bibcode = 2012Icar..221..365P
|doi = 10.1016/j.icarus.2012.07.026
|access-date= 26 September 2016}}
}}
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
- {{NeoDys|7336}}
- {{ESA-SSA|7336|Saunders}}
- {{JPL small body|id=2007336}}
{{Minor planets navigator|(7335) 1989 JA |number=7336 |(7337) 1990 QH1}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Saunders}}