Astronomy:844 Leontina
_Leontina.png) Modelled shape of Leontina from its lightcurve | |
| Discovery [1] | |
|---|---|
| Discovered by | J. Rheden |
| Discovery site | Vienna Obs. |
| Discovery date | 1 October 1916 |
| Designations | |
| (844) Leontina | |
| Pronunciation | /liːɒnˈtaɪnə/ |
| Named after | Lienz (discoverer's home town)[2] |
| 1916 AP · 1935 BN 1953 FL1 · A902 EC | |
| Minor planet category | main-belt · (outer) [1] |
| Orbital characteristics [1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 114.11 yr (41680 d) |
| |{{{apsis}}}|helion}} | 3.4273 astronomical unit|AU (512.72 Gm) |
| |{{{apsis}}}|helion}} | 2.9894 AU (447.21 Gm) |
| 3.2084 AU (479.97 Gm) | |
| Eccentricity | 0.068232 |
| Orbital period | 5.75 yr (2099.0 d) |
| Mean anomaly | 213.70° |
| Mean motion | 0° 10m 17.436s / day |
| Inclination | 8.7853° |
| Longitude of ascending node | 348.76° |
| 351.03° | |
| Physical characteristics | |
| Dimensions | 39.90±0.79 km[3] 49.558±0.785 km[4] 28.85±1.47 km[5] 35.73 km (calculated)[6] |
| Rotation period | 6.7859±0.0002 h[7] 6.784±0.001 h[7] 6.7965±0.0028 h[8] 6.7859 h (0.28275 d)[1] |
| Geometric albedo | 0.200±0.010[3] 0.1255±0.0132[4] 0.307±0.036[5] |
| SMASS = X [1] · S [6] | |
| Absolute magnitude (H) | 9.6[1] |
844 Leontina, provisional designation 1916 AP, is a stony asteroid from the outer region of the asteroid belt, about 36 kilometers in diameter. It was discovered on 1 October 1916, by Austrian astronomer Joseph Rheden at Vienna Observatory, Austria.[9]
Description
Leontina is an X-type asteroid in the SMASS classification. It orbits the Sun at a distance of 3.0–3.4 AU once every 5 years and 9 months (2,097 days). Its orbit is tilted by 9 degrees to the plane of the ecliptic and shows an eccentricity of 0.07.[1]
Multiple lightcurve analysis rendered a well-defined, concurring rotation period of 6.79 hours.[7][8] According to the surveys carried out by the Japanese Akari satellite and the U.S. Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, measurements of the body's brightness gave a divergent albedo of 0.13, 0.20 and 0.31, respectively.[3][4][5] As a result, the asteroid's estimated diameter strongly varies between 28 and 40 kilometers. The Collaborative Asteroid Lightcurve Link (CALL) considers Akari's albedo-figure of 0.20 the most accurate one and consequently assumes the otherwise classified X-type body to be of a stony surface composition with a calculated diameter of 36 kilometers.[6]
This minor planet was named by the discoverer for his home town Lienz in East Tyrol, Austria.[2]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: 844 Leontina (1916 AP)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000844.
- ↑ 2.0 2.1 Schmadel, Lutz D. (2003). "(844) Leontina". Dictionary of Minor Planet Names – (844) Leontina. Springer Berlin Heidelberg. p. 77. doi:10.1007/978-3-540-29925-7_845. ISBN 978-3-540-29925-7.
- ↑ 3.0 3.1 3.2 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
- ↑ 4.0 4.1 4.2 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. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 4 January 2016.
- ↑ 5.0 5.1 5.2 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. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 4 January 2016.
- ↑ 6.0 6.1 6.2 "LCDB Data for (844) Leontina". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=844%7CLeontina.
- ↑ 7.0 7.1 7.2 Behrend, Raoul. "Asteroids and comets rotation curves – (844) Leontina". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#000844.
- ↑ 8.0 8.1 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 4 January 2016.
- ↑ "844 Leontina (1916 AP)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=844.
External links
- The Asteroid Veritas: An intruder in a family named after it?
- 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 (1)-(5000) – Minor Planet Center
- 844 Leontina at AstDyS-2, Asteroids—Dynamic Site
- 844 Leontina at the JPL Small-Body Database
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