647 Adelgunde

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).[3][4][5][6]

    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 2 3 4 "JPL Small-Body Database Browser: 647 Adelgunde (1907 AD)" (2015-12-03 last obs.). Jet Propulsion Laboratory. Retrieved January 2016.
    2. 1 2 Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (647) Adelgunde. Springer Berlin Heidelberg. p. 64. ISBN 978-3-540-29925-7. Retrieved October 2015.
    3. 1 2 3 4 5 "LCDB Data for (647) Adelgunde". Asteroid Lightcurve Database (LCDB). Retrieved January 2016.
    4. 1 2 3 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". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved January 2016.
    5. 1 2 3 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved January 2016.
    6. 1 2 3 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved January 2016.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (647) Adelgunde". Geneva Observatory. Retrieved January 2016.
    8. ↑ "647 Adelgunde (1907 AD)". Minor Planet Center. Retrieved January 2016.
    9. ↑ Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (579) Sidonia, About Naming. Springer Berlin Heidelberg. pp. 59–60. ISBN 978-3-540-29925-7. Retrieved October 2015.

    External links


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