Astronomy:785 Zwetana
| Discovery | |
|---|---|
| Discovered by | Adam Massinger |
| Discovery site | Heidelberg |
| Discovery date | 30 March 1914 |
| Designations | |
| (785) Zwetana | |
| 1914 UN | |
| Orbital characteristics[1] | |
| Epoch 31 July 2016 (JD 2457600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 95.43 yr (34854 d) |
| |{{{apsis}}}|helion}} | 3.1099 astronomical unit|AU (465.23 Gm) |
| |{{{apsis}}}|helion}} | 2.0273 AU (303.28 Gm) |
| 2.5686 AU (384.26 Gm) | |
| Eccentricity | 0.21073 |
| Orbital period | 4.12 yr (1503.6 d) |
| Mean anomaly | 268.20° |
| Mean motion | 0° 14m 21.912s / day |
| Inclination | 12.769° |
| Longitude of ascending node | 71.882° |
| 131.607° | |
| Physical characteristics | |
| Mean radius | 24.27±0.9 km |
| Rotation period | 8.919 h[2] 8.8882 h (0.37034 d)[1] |
| Geometric albedo | 0.1245±0.010 |
| Absolute magnitude (H) | 9.45 |
785 Zwetana is a minor planet orbiting the Sun that was discovered by Adam Massinger, an assistant at the Heidelberg Observatory, on March 30, 1914. It was named for the daughter of Kiril Popoff, a Bulgarian astronomer.[3] This asteroid is orbiting 2.57 astronomical unit|AU from the Sun with an eccentricity (ovalness) of 0.21 and a period of 4.12 yr. The orbital plane is inclined by an angle of 12.8° to the plane of the ecliptic.[1]
This asteroid spans a girth of ~48.5 km and it has a Tholen taxonomic class of M. Radar observations indicate that it is almost certainly metallic.[4] The near infrared spectra suggests the presence of spinel on the surface, which is indicative of calcium–aluminium-rich inclusions.[5] The best meteorite analog to the near infrared spectrum of this object is the enstatite chondrite, Abee.[6]
In 1990, the asteroid was observed from the European Southern Observatory, allowing a composite light curve to be produced that showed a rotation period of 8.919±0.004 h and a brightness variation of 0.13±0.01 in magnitude.[2] 2013 observations from the Palmer Divide Observatory found a rotation period of 8.885 hours with a magnitude amplitude of 0.18. This is consistent with other published results.[7]
References
- ↑ 1.0 1.1 1.2 Yeomans, Donald K., "785 Zwetana", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=785, retrieved 5 May 2016.
- ↑ 2.0 2.1 Dotto, E. et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series 95 (2): pp. 195–211, Bibcode: 1992A&AS...95..195D.
- ↑ Schmadel, Lutz D. (2013), Dictionary of Minor Planet Names, Springer Berlin Heidelberg, p. 117, ISBN 9783662066157, https://books.google.com/books?id=eHv1CAAAQBAJ&pg=PA117.
- ↑ Shepard, Michael K. et al. (May 2008), "A radar survey of M- and X-class asteroids", Icarus 195 (1): 184–205, doi:10.1016/j.icarus.2007.11.032, Bibcode: 2008Icar..195..184S.
- ↑ Hardersen, Paul S. et al. (October 2007), "Nir Spectra And Interpretations For M-asteroids 369 Aeria And 785 Zwetana", Bulletin of the American Astronomical Society 39: 478, Bibcode: 2007DPS....39.3310H.
- ↑ Ockert-Bell, M. E. et al. (December 2010), "The composition of M-type asteroids: Synthesis of spectroscopic and radar observations", Icarus 210 (2): 674–692, doi:10.1016/j.icarus.2010.08.002, Bibcode: 2010Icar..210..674O.
- ↑ Warner, Brian D. (July 2013), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2013 January - March", The Minor Planet Bulletin 40 (3): 137–145, ISSN 1052-8091, PMID 32494785, Bibcode: 2013MPBu...40..137W.
External links
- 785 Zwetana at AstDyS-2, Asteroids—Dynamic Site
- 785 Zwetana at the JPL Small-Body Database
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