504 Cora

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504 Cora
Discovery [1]
Discovered by S. I. Bailey
Discovery site Boyden Station Arequipa
Discovery date 30 June 1902
Designations
MPC designation 504 Cora
Named after
Cora (Inca mythology)[2]
1902 LK · 1947 OH
main-belt · (outer)[3]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 109.86 yr (40,126 days)    
Aphelion 3.3127 AU
Perihelion 2.1284 AU
2.7206 AU
Eccentricity 0.2177
4.49 yr (1,639 days)
103.10°
0° 13m 10.56s / day
Inclination 12.890°
104.64°
247.88°
Physical characteristics
Dimensions 27.19±1.00 km[4]
29.06 km (derived)[3]
30.02±2.3 km (IRAS:40)[5]
30.39±0.35 km[6]
34.994±0.490 km[7]
7.588±0.003 h[8]
7.5882±0.0043 h[9]
7.591±0.001 h[10]
7.5915±0.0043[9]
24.06 h (dated)[11]
0.3407±0.058 (IRAS:40)[5]
0.336±0.010[6]
0.2509±0.0553[7]
0.239±0.032[4]
0.1908 (derived)[3]
SMASS = X[1]
M[7][12] · X[3]
9.4[5][6][7]
9.776±0.001 (R)[9]
9.858±0.001 (R)[9]
10.00[4]
10.07±0.35[13]
10.1[1][3]

504 Cora, provisional designation 1902 LK, is an asteroid from the outer region of the asteroid belt, approximately 30 kilometers in diameter. It was discovered by American astronomer Solon Bailey at Harvard's Boyden Station in Arequipa, Peru, on 30 June 1902.[14]

The asteroid orbits the Sun at a distance of 2.1–3.3 AU once every 4 years and 6 months (1,639 days). Its orbit has a relatively high eccentricity of 0.22 and an inclination of 13° with respect to the ecliptic.[1] The body's observation arc begins 4 years after its discovery with the first used observation made at Heidelberg in 1906.[14]

Mineralogic observations in the near-infrared with the NASA IRTF telescope using its SpeX spectrograph, showed that the surface of the X-type asteroid has absorption features which indicate the presence of pyroxene minerals.[12] In 2004, the body's spectrum was also obtained in the SMASSII survey at the U.S. MDM Observatory, Kitt Peak, Arizona.[15] It is also classified as a M-type on the Tholen taxonomic scheme[12] and by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE).[7]

Several rotational light-curves were obtained for this asteroid, rendering a rotation period of 7.59 hours.[10][9] The most reliable result was achieved from photometric observation made in September 2010, at the Hunters Hill Observatory (E14) in Ngunnawal, Australia. The light-curve gave a period of 7.588±0.003 hours with a brightness amplitude of 0.20 in magnitude (U=3-).[8]

According to the space-based surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and NASA's WISE telescope with its subsequent NEOWISE mission, the asteroid's surface has a high albedo between 0.239 and 0.341. Combined with their respective absolute magnitudes, this results in a diameter estimate of 27.2 to 35.0 kilometers.[5][6][7][4] In contrast, the Collaborative Asteroid Lightcurve Link derives a much lower albedo of 0.19 and a diameter of 29.1 kilometers, based on an absolute magnitude of 10.1.[3]

The minor planet was named after Cora, a figure in Inca mythology (AN 169).[2][16]

References[edit]

  1. ^ a b c d e "JPL Small-Body Database Browser: 504 Cora (1902 LK)" (2016-04-09 last obs.). Jet Propulsion Laboratory. Retrieved 25 May 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (504) Cora. Springer Berlin Heidelberg. p. 55. ISBN 978-3-540-00238-3. Retrieved 25 May 2016. 
  3. ^ a b c d e f "LCDB Data for (504) Cora". Asteroid Lightcurve Database (LCDB). Retrieved 25 May 2016. 
  4. ^ 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 25 May 2016. 
  5. ^ a b c d Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System. Bibcode:2004PDSS...12.....T. Retrieved 1 March 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". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 1 March 2016. 
  7. ^ a b c d e f 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:1109.6407free to read. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 25 May 2016. 
  8. ^ a b Higgins, David (January 2011). "Period Determination of Asteroid Targets Observed at Hunters Hill Observatory: May 2009 - September 2010". The Minor Planet Bulletin. 38 (1): 41–46. Bibcode:2011MPBu...38...41H. ISSN 1052-8091. Retrieved 25 May 2016. 
  9. ^ a b c d e Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041free to read. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 25 May 2016. 
  10. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (504) Cora". Geneva Observatory. Retrieved 25 May 2016. 
  11. ^ Barucci, M. A.; di Martino, M.; Fulchignoni, M. (May 1992). "Rotational properties of small asteroids - Photoelectric observations". Astronomical Journal: 1679–1686. Bibcode:1992AJ....103.1679B. doi:10.1086/116185. ISSN 0004-6256. Retrieved 25 May 2016. 
  12. ^ a b c Reynolds, Chalbeth; Hardersen, P. S.; Gaffey, M. J. (October 2007). "The Near-IR Spectrocopy of Two M-Class Main Belt Asteroids, 418 Alemannia and 504 Cora". American Astronomical Society. 39: 477. Bibcode:2007DPS....39.3306R. Retrieved 1 March 2016. 
  13. ^ 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 25 May 2016. 
  14. ^ a b "504 Cora (1902 LK)". Minor Planet Center. Retrieved 25 May 2016. 
  15. ^ Bus, S.; Binzel, R. P. (October 2004). "504 Cora CCD Spectrum". NASA Planetary Data System. Bibcode:2004PDSS....1..991B. Retrieved 1 March 2016. 
  16. ^ Osten, H. (October 1903). "Aufsuchungsephemeride des Planeten (504) [1902 LK]". Astronomische Nachrichten: 315. Bibcode:1903AN....163..315O. doi:10.1002/asna.19031632009. Retrieved 1 March 2016. 

External links[edit]