641 Agnes

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641 Agnes
Discovery [1]
Discovered by M. Wolf
Discovery site Heidelberg Obs.
Discovery date 8 September 1907
MPC designation 641 Agnes
Named after
1907 ZX · 1952 FD1
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 27 June 2015 (JD 2457200.5)
Uncertainty parameter 0
Observation arc 107.90 yr (39,411 days)
Aphelion 2.5053 AU
Perihelion 1.9338 AU
2.2195 AU
Eccentricity 0.1287
3.31 yr (1,208 days)
Inclination 1.7120°
Physical characteristics
Dimensions 9.24±0.64 km[4]
9.45±0.17 km[5]
9±2 km[6]
8.81 km (calculated)[3]
178.0±0.1 h[6]
8.9 h[7]

641 Agnes, provisional designation 1907 ZX, is a stony asteroid and slow rotator from the inner regions of the asteroid belt, about 9 kilometers in diameter. It was discovered on 8 September 1907, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[8]

The S-type asteroid is a member of the Flora family, one of the largest groups of stony asteroids in the main-belt. It orbits the Sun at a distance of 1.9–2.5 AU once every 3 years and 4 months (1,208 days). Its orbit is tilted by 2 degrees to the plane of the ecliptic and shows an eccentricity of 0.13.[1] The asteroid has a notably long rotation period of 178 hours[6] and an albedo in the range of 0.20 to 0.30, according to the surveys carried out by the Japanese Akari satellite and the U.S Wide-field Infrared Survey Explorer with its NEOWISE mission, as well as further ground-based observations.[4][5][6]

Any reference of this name to a person or occurrence is unknown.[2]


  1. ^ a b c d "JPL Small-Body Database Browser: 641 Agnes (1907 ZX)" (2015-08-06 last obs.). Jet Propulsion Laboratory. Retrieved January 2016. 
  2. ^ a b Schmadel, Lutz D. (2003). Dictionary of Minor Planet Names – (641) Agnes. Springer Berlin Heidelberg. p. 64. ISBN 978-3-540-29925-7. Retrieved January 2016. 
  3. ^ a b c "LCDB Data for (641) Agnes". Asteroid Lightcurve Database (LCDB). Retrieved January 2016. 
  4. ^ a b c 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. ^ a b c 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. 
  6. ^ a b c d e Pilcher, Frederick; Franco, Lorenzo; Martinez, Luis (April 2014). "Rotation Period and H-G Parameters of 641 Agnes". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 41 (2): 71–72. Bibcode:2014MPBu...41...71P. ISSN 1052-8091. Retrieved January 2016. 
  7. ^ Lagerkvist, C.-I. (March 1978). "Photographic photometry of 110 main-belt asteroids". Astronomy and Astrophysics Supplement Series: 361–381. Bibcode:1978A&AS...31..361L. Retrieved January 2016. 
  8. ^ "641 Agnes (1907 ZX)". Minor Planet Center. Retrieved January 2016. 

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