(11474) 1982 SM2
{{Use dmy dates|date=October 2019}}
{{DISPLAYTITLE:{{mp|(11474) 1982 SM|2}}}}
{{Infobox planet
| minorplanet = yes
| name = (11474) {{mp|1982 SM|2}}
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 18 September 1982
| discoverer = H. Debehogne
| discovery_site = La Silla Obs.
| mpc_name = (11474) {{mp|1982 SM|2}}
| alt_names = {{mp|1982 SM|2}}{{·}}1995 KD
| pronounced =
| named_after =
| mp_category = main-belt{{·}}Baptistina
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 32.59 yr (11,905 days)
| aphelion = 2.7224 AU
| perihelion = 1.8294 AU
| semimajor = 2.2759 AU
| eccentricity = 0.1962
| period = 3.43 yr (1,254 days)
| mean_anomaly = 76.029°
| mean_motion = {{Deg2DMS|0.2871|sup=ms}} / day
| inclination = 5.4069°
| asc_node = 348.59°
| arg_peri = 355.61°
| dimensions = 5.71 km {{small|(calculated)}}
| rotation = {{val|1917.2214|2716}} h
| albedo = 0.057 {{small|(assumed)}}
| spectral_type = C
| abs_magnitude = {{val|14.493|0.001}} {{small|(R)}}{{·}}14.7{{·}}14.94{{·}}{{val|14.94|0.61}}
}}
{{mp|(11474) 1982 SM|2}} is a carbonaceous Baptistina asteroid and potentially slow rotator from the inner regions of the asteroid belt, approximately 6 kilometers in diameter. It was discovered on 18 September 1982, by Belgian astronomer Henri Debehogne at ESO{{'}} La Silla Observatory in northern Chile.
Orbit and classification
The C-type asteroid belongs to the small Baptistina family. It orbits the Sun at a distance of 1.8–2.7 AU once every 3 years and 5 months (1,254 days). Its orbit has an eccentricity of 0.20 and an inclination of 5° with respect to the ecliptic. As no precoveries were taken, and no prior identifications were made, the asteroid's observation arc begins with its official discovery observation.
Physical characteristics
In September 2013, a rotational lightcurve of this asteroid was obtained from photometric observations in the R-band at the Palomar Transient Factory in California. It gave an exceptionally long rotation period of 1917 hours with a brightness amplitude of 0.04 magnitude ({{small|U=1}}). However, the fragmentary light-curve has received a low quality rating by the Collaborative Asteroid Lightcurve Link (CALL) which means that the result could be completely wrong (also see potentially slow rotator).
CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 5.71 kilometers, based on an absolute magnitude of 14.49.
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 28 September 1999. As of 2018, it has not been named.
References
{{reflist|refs=
|type = 2015-04-23 last obs.
|title = JPL Small-Body Database Browser: 11474 (1982 SM2)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011474
|publisher = Jet Propulsion Laboratory
|accessdate = 26 May 2017}}
|title = 11474 (1982 SM2)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=11474
|accessdate = 16 December 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|accessdate = 24 February 2018}}
|title = LCDB Data for (11474)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11474%7C
|accessdate = 16 December 2016}}
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|s2cid = 8342929 |access-date= 16 December 2016}}
|display-authors = 6
|first1 = Peter |last1 = Veres
|first2 = Robert |last2 = Jedicke
|first3 = Alan |last3 = Fitzsimmons
|first4 = Larry |last4 = Denneau
|first5 = Mikael |last5 = Granvik
|first6 = Bryce |last6 = Bolin
|first7 = Serge |last7 = Chastel
|first8 = Richard J. |last8 = Wainscoat
|first9 = William S. |last9 = Burgett
|first10 = Kenneth C. |last10 = Chambers
|first11 = Heather |last11 = Flewelling
|first12 = Nick |last12 = Kaiser
|first13 = Eugen A. |last13 = Magnier
|first14 = Jeff S. |last14 = Morgan
|first15 = Paul A. |last15 = Price
|first16 = John L. |last16 = Tonry
|first17 = Christopher |last17 = Waters
|date = November 2015
|title = Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V
|journal = Icarus
|volume = 261
|pages = 34–47
|bibcode = 2015Icar..261...34V
|doi = 10.1016/j.icarus.2015.08.007
|arxiv = 1506.00762
|s2cid = 53493339 |access-date= 16 December 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
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs010001.html Discovery Circumstances: Numbered Minor Planets (10001)-(15000)] – Minor Planet Center
- {{AstDys|11474}}
- {{JPL small body}}
{{Minor planets navigator |11473 Barbaresco |number=11474 |PageName={{mp|(11474) 1982 SM|2}} |11475 Velinský}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:1982 SM2}}