2093 Genichesk

2093 Genichesk, provisional designation 1971 HX, is a Baptistina asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. It was discovered on 28 April 1971, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula.^[10] It was named for the Ukrainian town Henichesk.^[2]

2093 Genichesk

Discovery [1]
Discovered by	T. Smirnova
Discovery site	Crimean Astrophysical Obs.
Discovery date	28 April 1971
Designations
MPC designation	(2093) Genichesk
Named after	Henichesk (Ukrainian town)[2]
Alternative designations	1971 HX · 1974 CN1 1975 VG2
Minor planet category	main-belt · Baptistina [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	66.78 yr (24,392 days)
Aphelion	2.6507 AU
Perihelion	1.8877 AU
Semi-major axis	2.2692 AU
Eccentricity	0.1681
Orbital period (sidereal)	3.42 yr (1,249 days)
Mean anomaly	175.62°
Mean motion	0° 17m 17.88s / day
Inclination	6.0914°
Longitude of ascending node	154.86°
Argument of perihelion	118.21°
Physical characteristics
Dimensions	8.804±1.922 km[4] 12.29 km (derived)[3]
Synodic rotation period	11.022±0.002 h[5] 11.0231±0.0159 h[6] 11.028±0.006 h[7][a]
Geometric albedo	0.057 (assumed)[3] 0.158±0.108[4]
Spectral type	C [3]
Absolute magnitude (H)	12.880±0.004 (R)[6] · 12.9[1] · 13.28±0.04[8] · 13.28±0.19[9] · 13.28[3]

Orbit and classification

Genichesk is a member of the Baptistina family. It orbits the Sun in the inner main-belt at a distance of 1.9–2.7 AU once every 3 years and 5 months (1,249 days). Its orbit has an eccentricity of 0.17 and an inclination of 6° with respect to the ecliptic.^[1] A first precovery was taken at Palomar Observatory in 1950, extending the body's observation arc by 21 years prior to its official discovery.^[10]

Physical characteristics

Diameter and albedo

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous C-type asteroids of 0.57 and calculates a diameter of 12.29 kilometers, based on an absolute magnitude of 13.28,^[3] while according to preliminary data from the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid's surface has a much higher albedo of 0.158 and only measures 8.8 kilometers in diameter.^[4]

Rotation period

Photometric observations by astronomer Brian D. Warner at the Palmer Divide Observatory in Colorado (716) during winter 2007–2008 were used to build a lightcurve, which gave a rotation period of 11.028±0.006 hours and a brightness variation of 0.24±0.02 in magnitude (U=3).^[7][a] The results concur with observations made by French amateur astronomers Stéphane Charbonnel and Laurent Bernasconi, and with analysed data from the Palomar Transient Factory Survey in 2004 and 2015, respectively (U=2/2).^[5][6]

Naming

This minor planet was named after the Ukrainian town Genichesk (Henichesk), the discoverer's birthplace in the former Ukrainian Soviet Socialist Republic.^[2] The official naming citation was published by the Minor Planet Center on 1 April 1980 (M.P.C. 5282).^[11]

Notes

1. Lightcurve plot of 2093 Genichesk, with a rotation period of 11.028±0.006 and an amplitude of 0.24 ± 0.02 magnitude. Palmer Divide Observatory, B. D. Warner (2008).

References

1. "JPL Small-Body Database Browser: 2093 Genichesk (1971 HX)" (2017-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 11 June 2017.
2. Schmadel, Lutz D. (2007). "(2093) Genichesk". Dictionary of Minor Planet Names – (2093) Genichesk. Springer Berlin Heidelberg. p. 170. doi:10.1007/978-3-540-29925-7_2094. ISBN 978-3-540-00238-3.
3. "LCDB Data for (2093) Genichesk". Asteroid Lightcurve Database (LCDB). Retrieved 26 October 2016.
4. Nugent, C. R.; Mainzer, A.; Masiero, J.; Bauer, J.; Cutri, R. M.; Grav, T.; et al. (December 2015). "NEOWISE Reactivation Mission Year One: Preliminary Asteroid Diameters and Albedos". The Astrophysical Journal. 814 (2): 13. arXiv:1509.02522. Bibcode:2015ApJ...814..117N. doi:10.1088/0004-637X/814/2/117. Retrieved 26 October 2016.
5. Behrend, Raoul. "Asteroids and comets rotation curves – (2093) Genichesk". Geneva Observatory. Retrieved 26 October 2016.
6. 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 26 October 2016.
7. Warner, Brian D. (September 2008). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: December 2007 - March 2008" (PDF). The Minor Planet Bulletin. 35 (3): 95–98. Bibcode:2008MPBu...35...95W. ISSN 1052-8091. Archived from the original (PDF) on 2 June 2013. Retrieved 26 October 2016.
8. Dymock, Roger (April 2010). "Absolute Magnitudes of Asteroids 1176 Lucidor and 2093 Genichesk". The Minor Planet Bulletin. 37 (2): 56. Bibcode:2010MPBu...37...56D. ISSN 1052-8091. Retrieved 26 October 2016.
9. 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 26 October 2016.
10. "2093 Genichesk (1971 HX)". Minor Planet Center. Retrieved 26 October 2016.
11. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 26 October 2016.