1793 Zoya

1793 Zoya

Shape model of Zoya from its lightcurve
Discovery[1]
Discovered by	T. Smirnova
Discovery site	Crimean Astrophysical Obs.
Discovery date	28 February 1968
Designations
MPC designation	(1793) Zoya
Named after	Zoya Kosmodemyanskaya (Hero of the Soviet Union)[2]
Alternative designations	1968 DW · 1932 MC 1933 UV · 1946 TC 1949 QX · 1951 AE 1953 VP2 · 1953 VW1 1953 XF · 1969 RP1
Minor planet category	main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	83.44 yr (30,475 days)
Aphelion	2.4405 AU
Perihelion	2.0067 AU
Semi-major axis	2.2236 AU
Eccentricity	0.0975
Orbital period (sidereal)	3.32 yr (1,211 days)
Mean anomaly	321.35°
Inclination	1.5088°
Longitude of ascending node	225.99°
Argument of perihelion	323.37°
Physical characteristics
Dimensions	8.348±0.301 km[4] 9.41 km (calculated)[3]
Synodic rotation period	5.75187±0.00001 h[5] 5.751872±0.000005 h[6] 5.753±0.001 h[7] 7.0 h[8]
Geometric albedo	0.24 (assumed)[3] 0.334±0.047[4]
Spectral type	S[3]
Absolute magnitude (H)	12.20[4] · 12.3[1][3] · 12.31±0.23[9]

1793 Zoya, provisional designation 1968 DW, is a stony Florian asteroid from the inner regions of the asteroid belt, approximately 9 kilometers in diameter. It was discovered on 28 February 1968, by Russian astronomer Tamara Smirnova at the Crimean Astrophysical Observatory in Nauchnyj, on the Crimean peninsula, and named after World War II partisan Zoya Kosmodemyanskaya.[2][10]

Orbit and classification

Zoya is a member of the Flora family, a large group of stony S-type asteroids in the inner main-belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.4 AU once every 3 years and 4 months (1,211 days). Its orbit has an eccentricity of 0.10 and an inclination of 2° with respect to the ecliptic.[1]

First identified as 1932 MC at Johannesburg, Zoya's first used observation was taken at Uccle Observatory in 1933, when it was identified as 1933 UV, extending the asteroid's observation arc by 35 years prior to its official discovery observation.[10]

Physical characteristics

Rotation period

In May 2008, a rotational lightcurve of Zoya was obtained from photometric observations taken by astronomer James W. Brinsfield (G69), giving a rotation period of 5.753 hours with a brightness variation of 0.40 magnitude (U=2+),[7] superseding a previous period of 7.0 hours obtained by Claes-Ingvar Lagerkvist in 1978 (U=2).[8] Modeled lightcurves published in 2016, gave a period of 5.751872 and 5.75187, respectively (U=n.a.).[5][6]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Zoya measures 8.35 kilometers in diameter, and its surface has an albedo of 0.334,[4] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from 8 Flora, the largest member and namesake of this asteroid family – and calculates a diameter of 9.41 kilometers with an absolute magnitude of 12.3.[3]

Naming

This minor planet was named in memory of Zoya Kosmodemyanskaya (1923–1941), Hero of the Soviet Union, partisan who died at the age of 18 during World War II in the Great Patriotic War. The minor planets 2072 Kosmodemyanskaya and 1977 Shura were named in honour of her mother and brother.[2] The official naming citation was published by the Minor Planet Center on 1 July 1972 (M.P.C. 3297).[11]

References

1. "JPL Small-Body Database Browser: 1793 Zoya (1968 DW)" (2017-03-29 last obs.). Jet Propulsion Laboratory. Retrieved 8 June 2017.
2. Schmadel, Lutz D. (2007). "(1793) Zoya". Dictionary of Minor Planet Names – (1793) Zoya. Springer Berlin Heidelberg. p. 143. doi:10.1007/978-3-540-29925-7_1794. ISBN 978-3-540-00238-3.
3. "LCDB Data for (1793) Zoya". Asteroid Lightcurve Database (LCDB). Retrieved 19 December 2016.
4. 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 19 December 2016.
5. Durech, J.; Hanus, J.; Oszkiewicz, D.; Vanco, R. (March 2016). "Asteroid models from the Lowell photometric database". Astronomy and Astrophysics. 587: 6. arXiv:1601.02909. Bibcode:2016A&A...587A..48D. doi:10.1051/0004-6361/201527573. Retrieved 19 December 2016.
6. Hanus, J.; Durech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: 24. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. Retrieved 19 December 2016.
7. Brinsfield, James W. (October 2008). "Asteroid Lightcurve Analysis at the Via Capote Observatory: 2nd Quarter 2008". The Minor Planet Bulletin. 35 (4): 179–181. Bibcode:2008MPBu...35..179B. ISSN 1052-8091. Retrieved 19 December 2016.
8. Lagerkvist, C.-I. (March 1978). "Photographic photometry of 110 main-belt asteroids". Astronomy and Astrophysics Supplement Series. 31: 361–381. Bibcode:1978A&AS...31..361L. Retrieved 19 December 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 19 December 2016.
10. "1793 Zoya (1968 DW)". Minor Planet Center. Retrieved 19 December 2016.
11. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 1793 Zoya at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1793 Zoya at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters