| Discovery [1] | |
|---|---|
| Discovered by | F. Börngen |
| Discovery site | Karl Schwarzschild Obs. |
| Discovery date | 28 December 1991 |
| Designations | |
| (7655) Adamries | |
Named after | Adam Ries (mathematician)[2] |
| 1991 YM1 · 1977 BW | |
| main-belt · Nysa [3] | |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 39.60 yr (14,464 days) |
| Aphelion | 2.7494AU |
| Perihelion | 2.0848 AU |
| 2.4171 AU | |
| Eccentricity | 0.1375 |
| 3.76yr (1,373 days) | |
| 289.57° | |
| 0° 15m 44.28s / day | |
| Inclination | 4.0156° |
| 103.41° | |
| 8.9941° | |
| Physical characteristics | |
| Dimensions | 3.60 km(calculated)[3] 4.21±0.96 km[4] |
| 22.8758±0.1133h[5] | |
| 0.21(assumed)[3] 0.250±0.124[4] | |
| C [6] · S [3] | |
| 14.00[4] · 14.081±0.004(R)[5] · 14.1[1] · 14.53[3] · 14.56±0.26[6] | |
7655 Adamries, provisional designation1991 YM1, is a Nysaasteroid from the inner regions of theasteroid belt, approximately 4 kilometers in diameter. It was discovered on 28 December 1991, by German astronomerFreimut Börngen atKarl Schwarzschild Observatory in Tautenburg, eastern Germany.[7] It was named after mathematicianAdam Ries.[2]
Adamries is a member of theNysa family, one of the prominent families of theinner main-belt, named after its namesake44 Nysa. It orbits the Sun at a distance of 2.1–2.7 AU once every 3 years and 9 months (1,373 days). Its orbit has aneccentricity of 0.14 and aninclination of 4° with respect to theecliptic.[1]Adamries was first identified as1977 BW atCrAO/Nauchnyj in 1977, extending the asteroid'sobservation arc by 15 years prior to its official discovery observation.[7]
Adamries has been characterized as a carbonaceousC-type asteroid byPan-STARRS' photometric survey.[6] It is also an assumed stonyS-type asteroid.[3]
In September 2013, rotationallightcurve ofAdamries was obtained from photometric observation by astronomers at thePalomar Transient Factory in California. It showed a longer-than-averagerotation period of22.8758 hours with a brightness variation of 0.33magnitude (U=2).[5]
According to the survey carried out by NASA's space-basedWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Adamries measures 4.2 kilometers in diameter and its surface has analbedo of 0.25, which is typical for stony asteroids.[4] CALL assumes a standard albedo for stony asteroids of 0.21 and calculates a diameter of 3.6 kilometers with anabsolute magnitude of 14.53.[3]
Thisminor planet was named in honor of famous German mathematicianAdam Ries (1492–1559), who wrote the first Germanarithmetic book in the 16th century, explaining in simple terms to the common people how to do arithmetic.[2]
At the time, this was considered to be difficult. This minor planet was the100th numbered discovery of astronomer Freimut Börngen.[2] The approved naming citation was published by theMinor Planet Center on 18 August 1997(M.P.C. 30478).[8] This minor planet should not be confused with236305 Adamriess, named after American astronomer and 2011 Nobel Prize winnerAdam Riess.
