Tanina was discovered by Russian astronomer Grigory Neujmin at the Simeiz Observatory on Crimean peninsula on 27 March 1916. One week later, on 3 April 1916, it was independently discovered by Max Wolf at the Heidelberg Observatory in Germany. The Minor Planet Center only recognizes the first discoverer. The asteroid was first observed as A904 UB at Heidelberg on 17 October 1904, while the body's observation arc begins with Wolf's independent discovery observation.[1]
Naming
This minor planet was named "Tanina". Any reference of its name to a person or occurrence is unknown.[2]
In February 2002, a rotational lightcurve of Tanina was obtained from photometric observations by Italian astronomer Andrea Ferrero at the Bigmuskie Observatory (B88). Lightcurve analysis gave a well-defined rotation period of 6.940±0.001 hours with a high brightness variation of 0.54±0.03magnitude, indicative of an elongated, non-spherical shape (U=3). The result supersedes previous period determinations of 6.746±0.001 hours with an amplitude of 0.48±0.02 magnitude (U=2) by Wiesław Z. Wiśniewski from February 1992,[14] and 6.9398±0.0005 hours with an amplitude of 0.47±0.05 magnitude (U=2) by Agnieszka Kryszczyńska in May 1999.[15] In 2011, a modeled lightcurve using data from the Uppsala Asteroid Photometric Catalogue (UAPC) and other sources gave a sidereal period 6.93981±0.00005 hours, as well as two spin axes at (46.0°, 48.0°) and (231.0°, 60.0°) in ecliptic coordinates (λ, β).[16]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, and the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Tanina measures (11.02±0.7), (13.06±0.38) and (13.423±0.150) kilometers in diameter and its surface has an albedo of (0.2624±0.038), (0.278±0.018) and (0.181±0.042), respectively.[7][8][9] The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.1508 from Petr Pravec's revised WISE data, and takes a diameter of 14.67 kilometers based on an absolute magnitude of 11.84.[13] Alternative mean-diameter measurements published by the WISE team include (12.690±0.350 km) and (14.611±0.068 km) with corresponding albedos of (0.275±0.042) and (0.1537±0.0333).[5][13]
^Schmadel, Lutz D. (2007). "Appendix 11 – Minor Planet Names with Unknown Meaning". Dictionary of Minor Planet Names – Fifth Revised and Enlarged revision. Springer Berlin Heidelberg. pp. 927–929. ISBN978-3-540-00238-3.
^Hanus, J.; Durech, J.; Broz, M.; Warner, B. D.; Pilcher, F.; Stephens, R.; et al. (June 2011). "A study of asteroid pole-latitude distribution based on an extended set of shape models derived by the lightcurve inversion method". Astronomy & Astrophysics. 530: 16. arXiv:1104.4114. Bibcode:2011A&A...530A.134H. doi:10.1051/0004-6361/201116738.