| 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 | 2.9166AU |
| Perihelion | 1.9659 AU |
| 2.4412 AU | |
| Eccentricity | 0.1947 |
| 3.81yr (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±0.007h[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 designation1907 AD, is a stonyasteroid from the inner regions of theasteroid belt, approximately 13 kilometers in diameter. It was discovered on 11 September 1907, by German astronomerAugust Kopff atHeidelberg Observatory in southern Germany.[10] The origin of the asteroid's name is unknown,[2] it may be derived from the name ofPrincess Adelgunde of Bavaria.
Adelgunde orbits the Sun in theinner main-belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,393 days). Its orbit has aneccentricity of 0.19 and aninclination of 7° with respect to theecliptic.[1] As noprecoveries were taken,Adelgunde'sobservation arc begins with its official discovery observation.[10]
According to the space-based observations by NASA'sWide-field Infrared Survey Explorer and its subsequentNEOWISE 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 JapaneseAkari satellite, it measures 13.7 kilometers with an albedo of 0.26.[7] TheCollaborative 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 anabsolute 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.
Adelgunde is anX-type asteroid on theTholen taxonomic scheme,[1] while CALL assumes it to be a stonyS-type asteroid.[3]
In August 2006, a rotationallightcurve ofAdelgunde was obtained from photometric observations by astronomersPierre Antonini andAntonio Vagnozzi. Lightcurve analysis gave a well-definedrotation period of32.202 hours with a brightness variation of 0.28 inmagnitude (U=3).[8]
The origin of thisminor planet's name is unknown.[2] It is speculated that the name comes from a list created in 1913 by theAstronomisches Rechen-Institut (ARI) containing suggestions of female names from history and mythology for the naming of minor planets. At the time, the naming process was not well developed and the ARI feared inconsistencies and potential confusion. The list was sent to several German astronomers, including Kopff, with the invitation to name all of their made discoveries up to number 700.[11]
Among the many thousands ofnamed minor planets,Adelgunde is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between164 Eva and1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomersAuguste Charlois,Johann Palisa,Max Wolf andKarl Reinmuth.[12]
