806 Gyldénia

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806 Gyldénia
Discovery [1]
Discovered by M. F. Wolf
Discovery site Heidelberg Obs.
Discovery date 18 April 1915
MPC designation 806 Gyldénia
Named after
Hugo Gyldén
1915 WX · 1950 LT
main-belt (outer)[1]
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 100.76 yr (36,803 days)    
Aphelion 3.4512 AU
Perihelion 2.9684 AU
3.2098 AU
Eccentricity 0.0752
5.75 yr (2,100 days)
0° 10m 17.04s / day
Inclination 14.240°
Physical characteristics
Dimensions 62.63±1.3 km (IRAS:14)[3]
62.78 km (derived)[4]
67.79±0.89 km[5]
83.10±0.74 km[6]
14.45±0.05 h[7]
14.452±0.001 h[7]
16.846±0.007 h[8]
16.852±0.006 h[9]
16.8537±0.0094 h[10]
0.0259±0.001 (IRAS:14)[3]
0.0373 (derived)[4]
9.953±0.002 (R)[10]

806 Gyldénia, provisional designation 1915 WX, is a carbonaceous asteroid from the outer region of the asteroid belt, approximately 63 kilometers in diameter. It was discovered on 18 April 1915, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[12] The discovery observation was ignored for orbital determination, with the first used observation made at Vienna Observatory on 1 May 2015, reducing the asteroid's observation arc by 2 weeks.[12]

The dark C-type asteroid orbits the Sun at a distance of 3.0–3.5 AU once every 5 years and 9 months (2,100 days). Its orbit has an eccentricity of 0.08 and an inclination of 14° with respect to the plane of the ecliptic.[1] Several photometric light-curve analysis rendered a rotation period of 16.852±0.006 hours (best result) with a brightness variation of 0.18 in magnitude (U=3).[9]

According to the surveys carried out by the Infrared Astronomical Satellite, IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid's surface has a notably low albedo of less than 0.03, while the Collaborative Asteroid Lightcurve Link derived a somewhat higher value of 0.04.[3][5][6][4]

The minor planet was named in honor of the Fenno-Swedish astronomer Hugo Gyldén (1841–1896), who was a director of the Stockholm Observatory. He developed a new technique to calculate the perturbations of planets and comets. The lunar crater Gyldén is also named after the astronomer (H 80)[2]


  1. ^ a b c d e "JPL Small-Body Database Browser: 806 Gyldenia (1915 WX)" (2016-01-21 last obs.). Jet Propulsion Laboratory. Retrieved July 2016. 
  2. ^ a b Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (806) Gyldénia. Springer Berlin Heidelberg. p. 75. ISBN 978-3-540-00238-3. Retrieved July 2016. 
  3. ^ 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 July 2016. 
  4. ^ a b c d e "LCDB Data for (806) Gyldenia". Asteroid Lightcurve Database (LCDB). Retrieved July 2016. 
  5. ^ 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 July 2016. 
  6. ^ 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:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved July 2016. 
  7. ^ a b Behrend, Raoul. "Asteroids and comets rotation curves – (806) Gyldenia". Geneva Observatory. Retrieved July 2016. 
  8. ^ Alkema, Michael S. (October 2013). "Asteroid Lightcurve Analysis at Elephant Head Observatory: 2013 April-July". The Minor Planet Bulletin 40 (4): 215–216. Bibcode:2013MPBu...40..215A. ISSN 1052-8091. Retrieved February 2016. 
  9. ^ a b Marciniak, A.; Pilcher, F.; Oszkiewicz, D.; Santana-Ros, T.; Urakawa, S.; Fauvaud, S.; et al. (December 2015). "Against the biases in spins and shapes of asteroids". Planetary and Space Science 118: 256–266. Bibcode:2015P&SS..118..256M. doi:10.1016/j.pss.2015.06.002. Retrieved July 2016. 
  10. ^ a b 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:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved July 2016. 
  11. ^ 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved July 2016. 
  12. ^ a b "806 Gyldenia (1915 WX)". Minor Planet Center. Retrieved July 2016. 

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