2005 Hencke

2005 Hencke
Discovery [1]
Discovered by P. Wild
Discovery site Zimmerwald Obs.
Discovery date 2 September 1973
Designations
MPC designation 2005 Hencke
Named after
 Karl Ludwig Hencke
(astronomer)[2]
1973 RA
main-belt · Eunomia [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 41.95 yr (15,324 days)
Aphelion 3.0600 AU
Perihelion 2.1824 AU
2.6212 AU
Eccentricity 0.1674
4.24 yr (1,550 days)
358.15°
0° 13m 55.92s / day
Inclination 12.219°
291.10°
110.88°
Physical characteristics
Dimensions 9.369±0.174 km[4]
10.53 km (calculated)[3]
10.186±0.006 h[5]
0.21 (assumed)[3]
0.2653±0.0230[4]
S [3]
12.2[1][3][4]
12.40±0.32[6]

    2005 Hencke, provisional designation 1973 RA, is a stony Eunomia asteroid from the middle region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland, on 2 September 1973.[7]

    The asteroid is a member of the Eunomia family, a large group of S-type asteroids and the most prominent family in the intermediate main-belt. It orbits the Sun at a distance of 2.2–3.1 AU once every 4 years and 3 months (1,550 days). Its orbit has an eccentricity of 0.17 and an inclination of 12° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc begins with its discovery in 1973.[7]

    In October 2007, a rotational light-curve was obtained for this asteroid from photometric observations taken by U.S. astronomer James W. Brinsfield at the Via Capote Observatory in Thousand Oaks, California (G69). The light-curve gave a rotation period of 10.186±0.006 hours with a brightness amplitude of 0.08 in magnitude (U=2).[3]

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 9.4 kilometers in diameter and its surface has an albedo of 0.27,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.21, derived from the family's largest member and namesake, 15 Eunomia, and calculates a diameter of 10.5 kilometers.[3]

    The minor planet was named in honor of German amateur astronomer Karl Ludwig Hencke (1793–1866), a postmaster by profession, who discovered the main-belt asteroids 5 Astraea and 6 Hebe in 1845 and 1847, respectively.[2] Naming citation was published before November 1977 (M.P.C. 4238).[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 2005 Hencke (1973 RA)" (2015-12-07 last obs.). Jet Propulsion Laboratory. Retrieved 19 July 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (2005) Hencke. Springer Berlin Heidelberg. p. 162. ISBN 978-3-540-00238-3. Retrieved 19 July 2016.
    3. 1 2 3 4 5 6 7 "LCDB Data for (2005) Hencke". Asteroid Lightcurve Database (LCDB). Retrieved 19 July 2016.
    4. 1 2 3 4 Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results" (PDF). The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 19 July 2016.
    5. ↑ Brinsfield, James W. (June 2008). "The Rotation Periods of 531 Zerlina, 1194 Aleta 1352 Wawel, 2005 Hencke, 2648 Owa, and 3509 Sanshui". The Minor Planet Bulletin. 35 (2): 86–87. Bibcode:2008MPBu...35...86B. ISSN 1052-8091. Retrieved 19 July 2016.
    6. ↑ 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:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 19 July 2016.
    7. 1 2 "2005 Hencke (1973 RA)". Minor Planet Center. Retrieved 19 July 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 19 July 2016.

    External links

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