647 Adelgunde

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647 Adelgunde
Discovery [1]
Discovered by A. Kopff
Discovery site Heidelberg Obs.
Discovery date 11 September 1907
MPC designation 647 Adelgunde
Named after
1907 AD · 1930 SA
1949 YJ · 1960 PA
main-belt · (inner)[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 108.76 yr (39,726 days)
Aphelion 2.9166 AU
Perihelion 1.9673 AU
2.4419 AU
Eccentricity 0.1944
3.82 yr (1,394 days)
0° 15m 29.88s / day
Inclination 7.3289°
Physical characteristics
Dimensions 9.769±0.108 km[4]
9.93±0.59 km[5]
13.69±0.76 km[6]
15.52 km (calculated)[3]
32.202±0.007 h[7]
0.20 (assumed)[3]
B–V = 0.719[1]
U–B = 0.297[1]
Tholen = X[1] · S[3]

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.[9]

The S-type asteroid is also classified as a X-type on the Tholen taxonomic scheme. It orbits the Sun at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,394 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, the asteroid's observation arc begins with its discovery observation in 1907.[9]

According to the space-based observations by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the asteroid measures 9.8 and 9.9 kilometers in diameter and its surface has an exceptionally high albedo of 0.49 and 0.51, respectively.[4][5] Based on the survey carried out by the Japanese Akari satellite, it measures 13.7 kilometers with an albedo of 0.26.[6] The Collaborative Asteroid Lightcurve Link 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, based on 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.

In August 2006, a rotational light-curve for this asteroid was obtained from photometric observations by astronomers Pierre Antonini and Antonio Vagnozzi. The light-curve gave a well-defined rotation period of 32.202±0.007 hours with a brightness variation of 0.28 in magnitude (U=3).[7]

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.[10]


  1. ^ a b c d e f g "JPL Small-Body Database Browser: 647 Adelgunde (1907 AD)" (2016-06-16 last obs.). Jet Propulsion Laboratory. Retrieved 11 August 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (647) Adelgunde. Springer Berlin Heidelberg. p. 64. ISBN 978-3-540-00238-3. Retrieved 11 August 2016. 
  3. ^ a b c d e f "LCDB Data for (647) Adelgunde". Asteroid Lightcurve Database (LCDB). Retrieved 11 August 2016. 
  4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 11 August 2016. 
  5. ^ a b c d Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794free to read. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 11 August 2016. 
  6. ^ a b c d Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey" (PDF). Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 11 August 2016. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (647) Adelgunde". Geneva Observatory. Retrieved 11 August 2016. 
  8. ^ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762free to read. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 11 August 2016. 
  9. ^ a b "647 Adelgunde (1907 AD)". Minor Planet Center. Retrieved 11 August 2016. 
  10. ^ Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (579) Sidonia; Naming ARI guidelines. Springer Berlin Heidelberg. pp. 59–60. ISBN 978-3-540-00238-3. Retrieved 11 August 2016. 

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