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]

    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]

    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. 1 2 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.

    References

    1. 1 2 3 4 5 "6189 Volk (1989 EY2)". Minor Planet Center. Retrieved 30 June 2020.
    2. 1 2 3 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. 1 2 3 4 "JPL Small-Body Database Browser: 6189 Volk (1989 EY2)" (2020-02-02 last obs.). Jet Propulsion Laboratory. Retrieved 30 June 2020.
    4. 1 2 "Asteroid (6189) Volk". AstDyS-2, Asteroids – Dynamic Site. Retrieved 23 July 2018.
    5. 1 2 "Asteroid 6189 Volk – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 30 June 2020.
    6. 1 2 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. 1 2 3 4 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. 1 2 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. 1 2 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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