Discovered by H. Thiele MPC designation 1847 Stobbe Discovered 1 February 1916 Orbits Sun Discovery site Hamburg Observatory | Discovery date 1 February 1916 Minor planet category main-belt · (middle) Absolute magnitude 11 Asteroid group Asteroid belt | |
Named after Joachim Stobbe (astronomer) Alternative names A916 CA · 1930 ML1930 QT · 1937 AH1951 MG · 1951 NF1952 UC · 1959 LA1968 OM1 · A902 YBA906 YN People also search for Sun, 843 Nicolaia, 797 Montana, 3229 Solnhofen | ||
1847 Stobbe, provisional designation A916 CA, is an asteroid from the middle region of the asteroid belt, approximately 23 kilometers in diameter. It was discovered on 1 February 1916, by Danish astronomer Holger Thiele at Bergedorf Observatory in Hamburg, Germany.
It orbits the Sun at a distance of 2.6–2.7 AU once every 4 years and 3 months (1,540 days). Its orbit has an eccentricity of 0.02 and an inclination of 11° with respect to the ecliptic. The first (unused) precovery was taken at Heidelberg Observatory in 1902.
The X-type asteroid is classified on the SMASS taxonomic scheme as a Xc-subtype, a group of bodies with intermediary spectra between those typically seen for metallic and carbonaceous bodies. In March 2009, a rotational light-curve obtained from photometric observations made by French amateur astronomer Pierre Antonini at his Observatoire de Bédoin rendered a well-defined period of 7000561700000000000♠5.617±0.002 hours with a brightness variation of 0.35 in magnitude (U=3), superseding a previous observation at the Roach Motel Observatory (856) in Riverside, California, that gave a period of 7000637000000000000♠6.37±0.02 hours and an amplitude of 0.27 in magnitude (U=2).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid has an albedo of 0.11–0.14 with a corresponding diameter between 22.7 and 23.9 kilometers. The Collaborative Asteroid Lightcurve Link agrees with these results and derives an albedo of 0.113 and a diameter of 23.85 kilometers, while a study using preliminary results from NEOWISE diverges significantly from all other observations, giving a diameter of 17.4 kilometers and an albedo of 0.232.
The minor planet was named in honor of German astronomer and observer of comets and minor planets, Joachim Stobbe (1900–1943). During 1925–1927 he worked at the discovering Hamburg–Bergedorf Observatory and later at the Berlin Observatory, where he observed the rotational light-curve of the large near-Earth object 433 Eros in detail. During the last few years of his life, he was director of the Poznan Observatory in Poland. Naming citation was published before November 1977 (M.P.C. 4236).