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 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]
| 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) |
| Aphelion | 3.1099 AU (465.23 Gm) |
| Perihelion | 2.0273 AU (303.28 Gm) |
| 2.5686 AU (384.26 Gm) | |
| Eccentricity | 0.21073 |
| 4.12 yr (1503.6 d) | |
| 268.20° | |
| 0° 14m 21.912s / day | |
| Inclination | 12.769° |
| 71.882° | |
| 131.607° | |
| Physical characteristics | |
| 24.27±0.9 km | |
| 8.919 h[2] 8.8882 h (0.37034 d)[1] | |
| 0.1245±0.010 | |
| 9.45 | |
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
edit- ^ a b c Yeomans, Donald K., "785 Zwetana", JPL Small-Body Database Browser, NASA Jet Propulsion Laboratory, retrieved 5 May 2016.
- ^ a b Dotto, E.; et al. (June 1992), "M-type asteroids - Rotational properties of 16 objects", Astronomy and Astrophysics Supplement Series, vol. 95, no. 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.
- ^ Shepard, Michael K.; et al. (May 2008), "A radar survey of M- and X-class asteroids", Icarus, 195 (1): 184–205, Bibcode:2008Icar..195..184S, doi:10.1016/j.icarus.2007.11.032.
- ^ 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, Bibcode:2010Icar..210..674O, doi:10.1016/j.icarus.2010.08.002.
- ^ Warner, Brian D. (July 2013), "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2013 January - March", The Minor Planet Bulletin, 40 (3): 137–145, Bibcode:2013MPBu...40..137W, ISSN 1052-8091, PMC 7268919, PMID 32494785.
External links
edit- 785 Zwetana at AstDyS-2, Asteroids—Dynamic Site
- 785 Zwetana at the JPL Small-Body Database
