806 Gyldénia

806 Gyldénia
Discovery [1]
Discovered by M. Wolf
Discovery site Heidelberg Obs.
Discovery date 18 April 1915
Designations
MPC designation 806 Gyldénia
Named after
 Hugo Gyldén
(astronomer)[2]
1915 WX · 1950 LT
main-belt (outer)
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc 100.65 yr (36,762 days)    
Aphelion 3.4515 AU
Perihelion 2.9689 AU
3.2102 AU
Eccentricity 0.0751
5.75 yr (2,101 days)
212.26°
Inclination 14.238°
43.988°
119.22°
Physical characteristics
Dimensions 62.63±1.3 km (IRAS:14)[3]
67.79±0.89 km[4]
83.10±0.74 km[5]
62.82 km (derived)[6]
16.852±0.006 h[lower-alpha 1]
14.452±0.001 h[7]
14.45±0.05 h[7]
16.846±0.007 h[8]
16.8537±0.0094 h[9]
0.0259±0.001 (IRAS:14)[3]
0.022±0.001[4]
0.023±0.004[5]
0.0408 (derived)[6]
C [6]
10.2[1]

    806 Gyldénia, provisional designation 1915 WX, is a dark, carbonaceous asteroid from the outer region of the asteroid belt, about 63 kilometers in diameter. It was discovered on 18 April 1915, by German astronomer Max Wolf at Heidelberg Observatory in southern Germany.[10]

    The dark C-type asteroid orbits the Sun at a distance of 3.0–3.5 AU once every 5 years and 9 months (2,101 days). Its orbit shows an eccentricity of 0.08 and an inclination of 14 degrees from 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 amplitude of 0.18 in magnitude (U=3).[lower-alpha 1]

    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][4][5][6]

    The minor planet was named in honor of the Fenno-Swedish astronomer Hugo Gyldén (1841–1896), who was a director of the Stockholm Observatory and author of a new method for computing perturbations of planets and comets. The lunar crater Gyldén is also named after the astronomer.[2]

    References

    1. 1 2 Marciniak (2015): rotation period 16.852±0.006 hours with a brightness amplitude of 0.18 mag. Observation date 10 April 2013. Summary figures at Collaborative Asteroid Lightcurve Link (CALL) for (806) Gyldenia. Call assigns an Quality Code of 3 to this measurement, which denotes a secure result within the precision given and no ambiguity.
    1. 1 2 3 4 "JPL Small-Body Database Browser: 806 Gyldenia (1915 WX)" (2015-12-11 last obs.). Jet Propulsion Laboratory. Retrieved February 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (806) Gyldénia. Springer Berlin Heidelberg. p. 75. ISBN 978-3-540-00238-3. Retrieved February 2016.
    3. 1 2 3 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 February 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 February 2016.
    5. 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. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved February 2016.
    6. 1 2 3 4 "LCDB Data for (806) Gyldenia". Asteroid Lightcurve Database (LCDB). Retrieved February 2016.
    7. 1 2 Behrend, Raoul. "Asteroids and comets rotation curves – (806) Gyldenia". Geneva Observatory. Retrieved February 2016.
    8. ↑ Alkema, Michael S. (October 2013). "Asteroid Lightcurve Analysis at Elephant Head Observatory: 2013 April-July". Bulletin of the Minor Planets (Section of the Association of Lunar and Planetary Observers) 40 (4): 215–216. Bibcode:2013MPBu...40..215A. ISSN 1052-8091. Retrieved February 2016.
    9. ↑ 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. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved February 2016.
    10. ↑ "806 Gyldenia (1915 WX)". Minor Planet Center. Retrieved February 2016.

    External links


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