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]
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]
^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.
