647 Adelgunde

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647 Adelgunde
Discovery [1]
Discovered by A. Kopff
Discovery site Heidelberg Obs.
Discovery date 11 September 1907
Designations
MPC designation 647 Adelgunde
Named after
 unknown[2]
1907 AD · 1930 SA
1949 YJ · 1960 PA
main-belt · (inner) [3]
Orbital characteristics [1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 108.23 yr (39,530 days)
Aphelion 2.9151 AU
Perihelion 1.9691 AU
2.4421 AU
Eccentricity 0.1936
3.82 yr (1,394 days)
31.028°
Inclination 7.3272°
254.76°
175.84°
Physical characteristics
Dimensions 13.69±0.76 km[4]
9.769±0.108 km[5]
9.93±0.59 km[6]
15.52 km (calculated)[3]
32.202±0.007 h[7]
0.257±0.031[4]
0.5143±0.0862[5]
0.488±0.105[6]
0.20 (assumed)[3]
B–V = 0.719
U–B = 0.297
Tholen = X[1]
S [3]
11.41[1]

647 Adelgunde, provisional designation 1907 AD, is a stony asteroid from the inner regions of the asteroid belt, roughly 13 kilometers in diameter. It was discovered on 11 September 1907, by German astronomer August Kopff at Heidelberg Observatory in southern Germany.[8]

The asteroid orbits the Sun at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,394 days). Its orbit shows an eccentricity of 0.19 and is tilted by 7 degrees to the plane of the ecliptic. Photometric light-curve analysis by French astronomer Pierre Antonini and Italian astronomer Antonio Vagnozzi in 2006, rendered a rotation period of 32.202±0.007 hours with a brightness amplitude of 0.28 in magnitude.[7]

Based on the survey carried out by the U.S. Wide-field Infrared Survey Explorer with its NEOWISE mission, the asteroid's surface has an exceptionally high albedo of 0.51 and 0.49, respectively, while the Japanese Akari satellite found an albedo of 0.26, and the Collaborative Asteroid Lightcurve Link (CALL) assumes an even lower figure of 0.20, which is typical for stony S-type asteroids. The difference of the determined albedos also translates into divergent estimates for the asteroid's diameter. While WISE/NEOWISE give a diameter of 9.8 and 9.9 kilometers, Akari's observations render 13.7 kilometers, and CALL calculates 15.5 kilometer, as the lower the albedo (reflectivety), the higher the body's diameter, for a given absolute magnitude (brightness).[4][5][6][3]

The origin of the asteroid's name is unknown.[2] It is speculated that the name comes from a list created in 1913 by the Astronomisches 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 their discovered minor planets up to number 700.[9]

References

  1. ↑ 1.0 1.1 1.2 1.3 Lua error in package.lua at line 80: module 'strict' not found.
  2. ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
  4. ↑ 4.0 4.1 4.2 Lua error in package.lua at line 80: module 'strict' not found.
  5. ↑ 5.0 5.1 5.2 Lua error in package.lua at line 80: module 'strict' not found.
  6. ↑ 6.0 6.1 6.2 Lua error in package.lua at line 80: module 'strict' not found.
  7. ↑ 7.0 7.1 Lua error in package.lua at line 80: module 'strict' not found.
  8. ↑ Lua error in package.lua at line 80: module 'strict' not found.
  9. ↑ Lua error in package.lua at line 80: module 'strict' not found.

External links


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