Astronomy:11441 Anadiego
| Discovery[1] | |
|---|---|
| Discovered by | M. R. Cesco |
| Discovery site | El Leoncito Complex |
| Discovery date | 31 December 1975 |
| Designations | |
| (11441) Anadiego | |
| Named after | Ana Teresa Diego (political activist)[2] |
| 1975 YD · 1989 GA2 | |
| Minor planet category | main-belt · (middle) background |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.25 yr (15,065 days) |
| |{{{apsis}}}|helion}} | 3.2218 AU |
| |{{{apsis}}}|helion}} | 1.9025 AU |
| 2.5621 AU | |
| Eccentricity | 0.2575 |
| Orbital period | 4.10 yr (1,498 days) |
| Mean anomaly | 93.428° |
| Mean motion | 0° 14m 25.08s / day |
| Inclination | 12.286° |
| Longitude of ascending node | 217.96° |
| 205.40° | |
| Physical characteristics | |
| Dimensions | 6.833 km[3][4] 7.26±1.03 km[5] 8.18 km (calculated)[6] |
| Rotation period | 3.179±0.001 h[7] |
| Geometric albedo | 0.20 (assumed)[6] 0.254±0.129[5] 0.2869±0.0600[3] 0.287±0.060[4] |
| S[6][8] | |
| Absolute magnitude (H) | 12.44±0.57[8] · 12.8[1][3][5][6] |
11441 Anadiego, provisional designation 1975 YD, is a stony background asteroid from the central region of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 31 December 1975, by Argentine astronomer Mario R. Cesco at the El Leoncito Complex in western Argentina.[2] It was named in memory of Argentine political activist Ana Diego.[2]
Orbit and classification
Anadiego orbits the Sun in the central main-belt at a distance of 1.9–3.2 AU once every 4 years and 1 month (1,498 days). Its orbit has an eccentricity of 0.26 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc starts with its discovery observation in 1975.[2]
Physical characteristics
Anadiego has been characterized as a common S-type asteroid by Pan-STARRS photometric survey.[8]
Rotation period
A rotational lightcurve was obtained for this asteroid by astronomer Kevin Hills at the Australian Riverland Dingo Observatory in February 2013. It gave a rotation period of 3.179±0.001 hours with a brightness variation of 0.11 magnitude ({{{1}}}).[7]
Diameter and albedo
According to the surveys carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Anadiego measures 6.8 and 7.3 kilometers in diameter and its surface has an albedo of 0.287 and 0.254, respectively.[3][5] The Collaborative Asteroid Lightcurve Link assumes a lower standard albedo for stony asteroids of 0.20, and, correspondingly calculates a larger diameter of 8.2 kilometers with an absolute magnitude of 12.8.[6]
Naming
This minor planet was named in memory of Ana Teresa Diego (1954–1976), an astronomy student at La Plata Astronomical Observatory and political activist, who was kidnapped and disappeared in September 1976, by unidentified persons believed working for the military junta then ruling Argentina.[2] The approved naming citation was published by the Minor Planet Center 10 December 2011 (M.P.C. 77501).[9]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 11441 Anadiego (1975 YD)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2011441.
- ↑ 2.0 2.1 2.2 2.3 2.4 "11441 Anadiego (1975 YD)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=11441.
- ↑ 3.0 3.1 3.2 3.3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D. et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M.
- ↑ 4.0 4.1 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M.
- ↑ 5.0 5.1 5.2 5.3 Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C. et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters 759 (1): 5. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M.
- ↑ 6.0 6.1 6.2 6.3 6.4 "LCDB Data for (11441) Anadiego". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=11441%7CAnadiego.
- ↑ 7.0 7.1 Hills, Kevin (January 2014). "Asteroid Lightcurve Analysis at Riverland Dingo Observatory (RDO): 2013 Results". The Minor Planet Bulletin 41 (1): 2–3. ISSN 1052-8091. Bibcode: 2014MPBu...41....2H.
- ↑ 8.0 8.1 8.2 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.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
External links
- Asteroid Discovery: 1980–2012 — UHDTV: by Scott Manley on YouTube (time 3:13 min.)
- 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
- 11441 Anadiego at AstDyS-2, Asteroids—Dynamic Site
- 11441 Anadiego at the JPL Small-Body Database
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