9084 Achristou

9084 Achristou
Discovery [1]
Discovered by D. J. Asher
Discovery site Siding Spring Obs.
Discovery date 3 February 1995
Designations
MPC designation 9084 Achristou
Named after
 Apostolos Christou
(astronomer)[2]
1995 CS1 · 1980 GV1
main-belt · Hungaria [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 36.57 yr (13,359 days)
Aphelion 2.0048 AU
Perihelion 1.7149 AU
1.8598 AU
Eccentricity 0.0779
2.54 yr (926 days)
128.38°
0° 23m 18.96s / day
Inclination 23.098°
197.54°
72.125°
Earth MOID 0.7787 AU
Physical characteristics
Dimensions 1.76 km (calculated)[3]
1.916±0.367 km[4][5]
8.84±0.02 h[6]
0.30 (assumed)[3]
0.333±0.078[4][5]
E [3]
15.7[1][3] · 15.4[4] · 16.08±0.28[7]

    9084 Achristou, provisional designation 1995 CS1, is a stony Hungaria asteroid from the innermost regions of the asteroid belt, about 1.9 kilometers in diameter. It was discovered by British astronomer David J. Asher at Siding Spring Observatory in New South Wales, Australia, on 3 February 1995.[8]

    The bright 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 1.7–2.0 AU once every 2 years and 6 months (926 days). Its orbit has an eccentricity of 0.08 and an inclination of 23° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1980, extending the asteroid's observation arc by 15 years prior to its discovery.[8]

    In 2013, a photometric light-curve analysis at the U.S. Center for Solar System Studies in California has given a rotation period of 8.84±0.02 hours with a brightness amplitude of 0.09 in magnitude (U=2+).[6] Based on the survey carried out by the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 1.9 kilometers in diameter and its surface has an albedo of 0.33,[4][5] while the Collaborative Asteroid Lightcurve Link assumes an albedo of 0.30 and calculates a diameter of 1.8 kilometers.[3]

    The minor planet was named after Apostolos Christou (b. 1968), planetary astronomer and programmer at the North Irish Armagh Observatory, after which the minor planet 10502 Armaghobs was named. His field or research include minor planets in co-orbit with Venus, designing near-Earth asteroids missions, the dwarf planet 1 Ceres, meteor impacts on Venus, as well as the irregular satellite families of the outer planets.[2] Naming citation was published on 23 May 2005 (M.P.C. 54173).[9]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 9084 Achristou (1995 CS1)" (2016-11-04 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016.
    2. 1 2 Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (9084) Achristou, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 42. ISBN 978-3-540-34360-8. Retrieved 28 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (9084) Achristou". Asteroid Lightcurve Database (LCDB). Retrieved 28 April 2016.
    4. 1 2 3 4 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 28 April 2016.
    5. 1 2 3 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 4 December 2016.
    6. 1 2 Stephens, Robert D.; Coley, Daniel; Warner, Brian D. (January 2014). "Collaborative Asteroid Lightcurve Analysis at the Center for Solar System Studies: 2013 April-June". The Minor Planet Bulletin. 41 (1): 8–13. Bibcode:2014MPBu...41....8S. ISSN 1052-8091. Retrieved 28 April 2016.
    7. ↑ 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 28 April 2016.
    8. 1 2 "9084 Achristou (1995 CS1)". Minor Planet Center. Retrieved 28 April 2016.
    9. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 28 April 2016.

    External links

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