6189 Völk

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6189 Völk
Discovery [1]
Discovered by E. W. Elst
Discovery site La Silla Obs.
Discovery date 2 March 1989
MPC designation (6189) Völk
Named after
Elisabeth Völk
(ESO staff member)[2]
1989 EY2 · 1980 TY4
5489 T-2
main-belt · Flora[3]
Orbital characteristics[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 43.58 yr (15,919 days)
Aphelion 2.6167 AU
Perihelion 1.9929 AU
2.3048 AU
Eccentricity 0.1353
3.50 yr (1,278 days)
0° 16m 54.12s / day
Inclination 5.9403°
Physical characteristics
Dimensions 3.982±0.156 km[4][5]
5.17 km (calculated)[3]
2.896±0.001 h[6]
0.24 (assumed)[3]
13.6[1][3] · 13.5[4] · 14.43±0.59[7]

6189 Völk, provisional designation 1989 EY2, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 5 kilometers in diameter. It was discovered on 2 March 1989, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile.[8] It was named for ESO staff member Elisabeth Völk.[2]

Classification and orbit[edit]

Völk is a stony S-type asteroid and member of the Flora family, one of the largest groups of stony asteroids in the inner main-belt. It orbits the Sun at a distance of 2.0–2.6 AU once every 3 years and 6 months (1,278 days). Its orbit has an eccentricity of 0.14 and an inclination of 6° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1973, extending the asteroid's observation arc by 16 years prior to its discovery.[8]


In September 2015, a rotational lightcurve was constructed from photometric observations by American astronomer Robert D. Stephens at the Center for Solar System Studies in California. It showed a well-defined rotation period of 2.896±0.001 hours with a brightness amplitude of 0.18 in magnitude (U=3).[6]


According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 4.0 kilometers in diameter and its surface has an outstandingly high albedo of 0.44,[4][5] while the Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.24 – in accordance with the family's largest member and namesake, 8 Flora – and calculates a diameter of 5.2 kilometers.[3] The body's S-type spectrum has also been determined in the large-scale survey performed by Pan-STARRS.[7]


This minor planet was named after Elisabeth Völk (born 1946), administrative staff member at ESO's headquarters in Germany, in charge of the ESO Schmidt plates archive, who became a good friend of the discoverer. The naming was independently suggested by astronomer and author of the Dictionary of Minor Planets, Lutz Schmadel.[2] The approved naming citation was published by the Minor Planet Center on 15 February 1995 (M.P.C. 24766).[9]


  1. ^ a b c d "JPL Small-Body Database Browser: 6189 Volk (1989 EY2)" (2017-05-01 last obs.). Jet Propulsion Laboratory. Retrieved 4 July 2017. 
  2. ^ a b c Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (6189) Völk. Springer Berlin Heidelberg. p. 516. ISBN 978-3-540-00238-3. Retrieved 14 April 2016. 
  3. ^ a b c d e f "LCDB Data for (6189) Volk". Asteroid Lightcurve Database (LCDB). Retrieved 14 April 2016. 
  4. ^ a b c d Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 14 April 2016. 
  5. ^ a b c Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 5 December 2016. 
  6. ^ a b Stephens, Robert D. (January 2016). "Asteroids Observed from CS3: 2015 July - September". The Minor Planet Bulletin. 43 (1): 52–56. Bibcode:2016MPBu...43...52S. ISSN 1052-8091. Retrieved 14 April 2016. 
  7. ^ a b c 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 14 April 2016. 
  8. ^ a b "6189 Volk (1989 EY2)". Minor Planet Center. Retrieved 14 April 2016. 
  9. ^ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016. 

External links[edit]