6250 Saekohayashi

6250 Saekohayashi
Discovery [1]
Discovered by E. F. Helin
Discovery site Palomar Obs.
Discovery date 2 November 1991
Designations
MPC designation 6250 Saekohayashi
Named after
 Saeko Hayashi
(astronomer)[1]
1991 VX1 · 1983 VP5
main-belt (inner) · Hungaria [2]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 32.25 yr (11,781 days)
Aphelion 2.0698 AU
Perihelion 1.7952 AU
1.9325 AU
Eccentricity 0.0710
2.69 yr (981 days)
310.03°
0° 22m 0.48s / day
Inclination 19.785°
226.56°
299.28°
Physical characteristics
Dimensions 3.67 km (calculated)[2]
82.6±0.5 h[3]
0.30 (assumed)[2]
E [2]
14.1[1][2]
14.17±0.26[4]

    6250 Saekohayashi, provisional designation 1991 VX1, is a bright Hungaria asteroid and relatively slow rotator from the inner regions of the asteroid belt, about 3.7 kilometers in diameter. It was discovered by American female astronomer Eleanor Helin at the U.S. Palomar Observatory, California, on 2 November 1991.[5]

    The stony E-type asteroid is a member of the Hungaria family, which form the innermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.8–2.1 AU once every 2 years and 8 months (981 days). Its orbit has an eccentricity of 0.07 and an inclination of 20° with respect to the plane of the ecliptic.[1] The first precovery was taken at Karl Schwarzschild Observatory in 1983, extending the asteroid's observation arc by 8 years prior to its discovery.[5]

    In 2009, a photometric light-curve analysis by Brian Warner at the U.S. Palmer Divide Observatory, Colorado, rendered a long rotation period of 82.6±0.5 hours with an brightness amplitude of 0.78 in magnitude (U=2+).[3] The Collaborative Asteroid Lightcurve Link assumes a high albedo of 0.30, typical for E-type members this asteroid family, and calculates a diameter of 3.7 kilometers.[2]

    The minor planet was named after Japanese female astronomer Saeko S. Hayashi (b. 1958), associate professor at the National Astronomical Observatory of Japan, who works with the Subaru Telescope. Her research includes the formation processes of planetary systems. She is also dedicated to the popularization of astronomy in Hawaii and Japan and is an active member of the International Astronomical Union.[1][6] Naming citation was published 15 February 1995 (M.P.C. 24730).[7]

    References

    1. 1 2 3 4 5 6 "JPL Small-Body Database Browser: 6250 Saekohayashi (1991 VX1)" (2016-02-10 last obs.). Jet Propulsion Laboratory. Retrieved May 2016.
    2. 1 2 3 4 5 6 "LCDB Data for (6250) Saekohayashi". Asteroid Lightcurve Database (LCDB). Retrieved May 2016.
    3. 1 2 Warner, Brian D. (October 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2009 March-June". The Minor Planet Bulletin 36 (4): 172–176. Bibcode:2009MPBu...36..172W. ISSN 1052-8091. Retrieved January 2016.
    4. ↑ 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 May 2016.
    5. 1 2 "6250 Saekohayashi (1991 VX1)". Minor Planet Center. Retrieved May 2016.
    6. ↑ "Saeko S. Hayashi". IAU – International Astronomical Union. 29 September 2015. Retrieved January 2016.
    7. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved April 2016.

    External links


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