Astronomy:(11474) 1982 SM2
| Discovery[1] | |
|---|---|
| Discovered by | H. Debehogne |
| Discovery site | La Silla Obs. |
| Discovery date | 18 September 1982 |
| Designations | |
| (11474) 1982 SM2 | |
| 1982 SM2 · 1995 KD | |
| Minor planet category | main-belt · Baptistina[2] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 32.59 yr (11,905 days) |
| |{{{apsis}}}|helion}} | 2.7224 AU |
| |{{{apsis}}}|helion}} | 1.8294 AU |
| 2.2759 AU | |
| Eccentricity | 0.1962 |
| Orbital period | 3.43 yr (1,254 days) |
| Mean anomaly | 76.029° |
| Mean motion | 0° 17m 13.56s / day |
| Inclination | 5.4069° |
| Longitude of ascending node | 348.59° |
| 355.61° | |
| Physical characteristics | |
| Dimensions | 5.71 km (calculated)[2] |
| Rotation period | 1917.2214±2716 h[3] |
| Geometric albedo | 0.057 (assumed)[2] |
| C[2] | |
| Absolute magnitude (H) | 14.493±0.001 (R)[3] · 14.7[1] · 14.94[2] · 14.94±0.61[4] |
(11474) 1982 SM2 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.[5]
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.[1] As no precoveries were taken, and no prior identifications were made, the asteroid's observation arc begins with its official discovery observation.[5]
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 ({{{1}}}).[3] 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).[2][3]
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.[2]
Numbering and naming
This minor planet was numbered by the Minor Planet Center on 28 September 1999.[6] As of 2018, it has not been named.[5]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 11474 (1982 SM2)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011474. Retrieved 26 May 2017.
- ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "LCDB Data for (11474)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11474%7C. Retrieved 16 December 2016.
- ↑ 3.0 3.1 3.2 3.3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal 150 (3): 35. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 16 December 2016.
- ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus 261: 34–47. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 16 December 2016.
- ↑ 5.0 5.1 5.2 "11474 (1982 SM2)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=11474. Retrieved 16 December 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 24 February 2018.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (10001)-(15000) – Minor Planet Center
- (11474) 1982 SM2 at AstDyS-2, Asteroids—Dynamic Site
- (11474) 1982 SM2 at the JPL Small-Body Database
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