647 Adelgunde
From Wikipedia, the free encyclopedia
| Discovery[1] | |
|---|---|
| Discovered by | A. Kopff |
| Discovery site | Heidelberg Obs. |
| Discovery date | 11 September 1907 |
| Designations | |
| (647) Adelgunde | |
Named after | unknown[2] |
| 1907 AD · 1930 SA 1949 YJ · 1960 PA | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 109.79 yr (40,102 days) |
| Aphelion | 2.9166 AU |
| Perihelion | 1.9659 AU |
| 2.4412 AU | |
| Eccentricity | 0.1947 |
| 3.81 yr (1,393 days) | |
| 237.76° | |
| 0° 15m 30.24s / day | |
| Inclination | 7.3311° |
| 254.68° | |
| 175.79° | |
| Physical characteristics | |
| Dimensions | 9.725±0.092[4] 9.769±0.108 km[5] 9.93±0.59 km[6] 13.69±0.76 km[7] 15.52 km (calculated)[3] |
| 32.202±0.007 h[8] | |
| 0.20 (assumed)[3] 0.257±0.031[7] 0.488±0.105[6] 0.508±0.040[4] 0.5143±0.0862[5] | |
| Tholen = X[1] · S[3] B–V = 0.719[1] U–B = 0.297[1] | |
| 10.89±0.57[9] · 11.41[1][3][5][6][7] | |
647 Adelgunde, provisional designation 1907 AD, is a stony asteroid from the inner regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 11 September 1907, by German astronomer August Kopff at Heidelberg Observatory in southern Germany.[10] The origin of the asteroid's name is unknown,[2] it may be derived from the name of Princess Adelgunde of Bavaria.
Adelgunde orbits the Sun in the inner main-belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,393 days). Its orbit has an eccentricity of 0.19 and an inclination of 7° with respect to the ecliptic.[1] As no precoveries were taken, Adelgunde's observation arc begins with its official discovery observation.[10]
Physical characteristics
Diameter and albedo
According to the space-based observations by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, Adelgunde measures between 9.72 and 9.93 kilometers in diameter, and its surface has a high albedo of 0.488–0.514.[4][5][6]
Based on the survey carried out by the Japanese Akari satellite, it measures 13.7 kilometers with an albedo of 0.26.[7] The Collaborative Asteroid Lightcurve Link (CALL) agrees with the results obtained by AKARI, assumes a standard albedo for stony asteroids of 0.20, and calculates a diameter of 15.5 kilometers with an absolute magnitude of 11.41.[3] As the diameters are typically inferred from the body's absolute brightness and its reflectively, a higher albedo results in a smaller diameter.
Spectral type
Adelgunde is an X-type asteroid on the Tholen taxonomic scheme,[1] while CALL assumes it to be a stony S-type asteroid.[3]
Rotation period
In August 2006, a rotational lightcurve of Adelgunde was obtained from photometric observations by astronomers Pierre Antonini and Antonio Vagnozzi. Lightcurve analysis gave a well-defined rotation period of 32.202 hours with a brightness variation of 0.28 in magnitude (U=3).[8]
