Discovered by F. Börngen MPC designation 7655 Adamries Discovered 28 December 1991 | Discovery date 28 December 1991 Alternative names 1991 YM1 · 1977 BW Orbital period 1,373 days Orbits Sun | |
Similar 588 Achilles, Sun, 135 Hertha | ||
7655 Adamries, provisional designation 1991 YM1, is a Nysa asteroid from the inner regions of the asteroid belt, approximately 4 kilometers in diameter. It was discovered on 28 December 1991, by German astronomer Freimut Börngen at Karl Schwarzschild Observatory in Tautenburg, eastern Germany.
The asteroid is a member of the Nysa family, one of the smaller families in the main-belt, named after its namesake, 44 Nysa. It orbits the Sun at a distance of 2.1–2.7 AU once every 3 years and 9 months (1,372 days). Its orbit has an eccentricity of 0.14 and an inclination of 4° with respect to the ecliptic. Adamries was first identified as "1977 BW" at CrAO/Nauchnyj in 1977, extending the asteroid's observation arc by 15 years prior to its official discovery observation.
A rotational light-curve was obtained from photometric observation made at the U.S. Palomar Transient Factory, California, in September 2013. It showed an above average rotation period of 7001228758000000000♠22.8758±0.1133 hours with a brightness variation of 0.33 magnitude (U=2). The body's spectral type is unclear, as the Collaborative Asteroid Lightcurve Link (CALL) and Pan-STARRS' large-scale survey classify it as a S-type and C-type asteroid, respectively. According to the survey carried out by NASA's space-based Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures 4.2 kilometers in diameter and its surface has an albedo of 0.25, while CALL assumes a standard albedo for stony asteroids of 0.21 and calculates a diameter of 3.6 kilometers.
The minor planet was named in honor of famous German mathematician Adam Ries (1492–1559), who wrote the first German arithmetic book in the 16th century, explaining in simple terms to the common people how to do arithmetic. At the time, this was considered to be difficult. This minor planet was the 100th numbered discovery of astronomer Freimut Börngen. Naming citation was published on 18 August 1997 (M.P.C. 30478). This minor planet should not be confused with 236305 Adamriess, named after American astronomer and 2011 Nobel Prize winner Adam Riess.