6189 Völk

6189 Völk (prov. designation: 1989 EY2) is a stony Vesta asteroid, approximately 4 kilometers (2.5 miles) in diameter, located in the inner regions of the asteroid belt. It was discovered on 2 March 1989, by Belgian astronomer Eric Elst at the La Silla Observatory in northern Chile.[1] The S-type asteroid has a short rotation period of 2.9 hours. It was named for Elisabeth Völk, a staff member at ESO headquarters in Germany.[2]

6189 Völk
Discovery [1]
Discovered byE. W. Elst
Discovery siteLa Silla Obs.
Discovery date2 March 1989
Designations
(6189) Völk
Named after
Elisabeth Völk
(ESO staff member)[2]
1989 EY2 · 1980 TY4
5489 T-2
main-belt [1][3] · (inner)
Vesta [4][5][6]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc46.34 yr (16,926 d)
Aphelion2.6157 AU
Perihelion1.9938 AU
2.3048 AU
Eccentricity0.1349
3.50 yr (1,278 d)
164.96°
0° 16m 54.12s / day
Inclination5.9423°
245.32°
68.736°
Physical characteristics
Mean diameter
3.982±0.156 km[7]
2.896±0.001 h[8][lower-alpha 1]
0.443±0.079[7]
S (SDSS-MOC)[9]

    Classification and orbit

    When applying the synthetic hierarchical clustering method to its proper orbital elements, Völk is a core member of the stony Vesta family,[4][5][6] one of the largest families in the inner asteroid belt. It orbits the Sun in the inner main-belt at a distance of 2.0–2.6 AU once every 3 years and 6 months (1,278 days; semi-major axis of 2.3 AU). Its orbit has an eccentricity of 0.13 and an inclination of 6° with respect to the ecliptic.[3] It was first observed as 5489 T-2 at Palomar Observatory during the second Palomar–Leiden Trojan survey in September 1973, extending the asteroid's observation arc by almost 16 years prior to its official discovery at La Silla.[1]

    Naming

    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 naming citation was published by the Minor Planet Center on 15 February 1995 (M.P.C. 24766).[10]

    Physical characteristics

    In the SDSS-based taxonomy, Völk is a common, stony S-type asteroid.[9]

    Lightcurve

    In September 2015, a rotational lightcurve was constructed from photometric observations by Robert D. Stephens at the Center for Solar System Studies in California (U81). Lightcurve analysis gave a well-defined rotation period of 2.896±0.001 hours with a brightness amplitude of 0.18±0.02 in magnitude (U=3).[8][lower-alpha 1]

    Diameter

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures (3.982±0.156) kilometers in diameter and its surface has an outstandingly high albedo of (0.443±0.079),[7] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – in accordance with the LCDB's divergent classification into the Flora family – and calculates a larger diameter of 5.2 kilometers.[11]

    Notes
    1. Lightcurve plot of (6189) Völk by Robert Stephens at the Center for Solar System Studies (2015). Rotation period of (2.896±0.001) hours with a brightness amplitude of 0.18±0.02 mag. Quality code of 3. Summary figures at the LCDB and CS3 web pages.
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    References
    1. "6189 Volk (1989 EY2)". Minor Planet Center. Retrieved 30 June 2020.
    2. Schmadel, Lutz D. (2007). "(6189) Völk". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 516. doi:10.1007/978-3-540-29925-7_5706. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 6189 Volk (1989 EY2)" (2020-02-02 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2020.
    4. "Asteroid (6189) Volk". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 July 2018.
    5. "Asteroid 6189 Volk – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 30 June 2020.
    6. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 15 March 2020. (PDS main page)
    7. Mainzer, A. K.; Bauer, J. M.; Cutri, R. M.; Grav, T.; Kramer, E. A.; Masiero, J. R.; et al. (June 2016). "NEOWISE Diameters and Albedos V1.0". NASA Planetary Data System. Bibcode:2016PDSS..247.....M. Retrieved 30 June 2020.
    8. 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.
    9. Carvano, J. M.; Hasselmann, P. H.; Lazzaro, D.; Mothé-Diniz, T. (February 2010). "SDSS-based taxonomic classification and orbital distribution of main belt asteroids". Astronomy and Astrophysics. 510: 12. Bibcode:2010A&A...510A..43C. doi:10.1051/0004-6361/200913322. Retrieved 30 October 2019. (PDS data set)
    10. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 30 June 2020.
    11. "LCDB Data for (6189) Volk". Asteroid Lightcurve Database (LCDB). Retrieved 14 April 2016.
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