6805 Abstracta

6805 Abstracta
Discovery [1]
Discovered by C. J. van Houten
I. van Houten
T. Gehrels
Discovery site Palomar Obs.
Discovery date 24 September 1960
Designations
MPC designation 6805 Abstracta
Named after
 Astronomy and Astrophysics Abstracts (AAA)[2]
4600 P-L · 1988 RG11
main-belt · Themis [3]
Orbital characteristics [1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 65.55 yr (23,941 days)
Aphelion 3.6853 AU
Perihelion 2.6902 AU
3.1877 AU
Eccentricity 0.1560
5.69 yr (2,079 days)
212.56°
0° 10m 23.16s / day
Inclination 1.8951°
136.68°
338.27°
Physical characteristics
Dimensions 11.870±0.246 km[4]
8.41 km (calculated)[3]
152.1834±0.8953 h[5]
0.0867±0.0264[4]
0.08 (assumed)[3]
C [3]
13.0[1]
12.9[4]
13.74[3]
13.286±0.009 (R)[5]

    6805 Abstracta, provisional designation 4600 P-L, is a carbonaceous Themistian asteroid and slow rotator from the outer region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 24 September 1960, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the U.S. Palomar Observatory in California.[6]

    The dark C-type asteroid is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun at a distance of 2.7–3.7 AU once every 5 years and 8 months (2,078 days). Its orbit has an eccentricity of 0.16 and an inclination of 2° with respect to the ecliptic.[1] The first precovery was taken at Palomar Observatory in 1949, extending the asteroid's observation arc by 11 years prior to its discovery.[6]

    A rotational light-curve was obtained at the U.S. Palomar Transient Factory from photometric observation made in September 2011. It showed an exceptionally long rotation period of 152.1834±0.8953 hours with a brightness amplitude of 0.78 in magnitude (U=2).[5]

    According to the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, the asteroid measures 11.9 kilometers in diameter and its surface has a low albedo of 0.09.[4] The Collaborative Asteroid Lightcurve Link assumes a typical albedo for carbonaceous asteroids of 0.08 and calculates a somewhat smaller diameter of 8.4 kilometers.[3]

    The designation "P-L" stands for Palomar–Leiden, named after Palomar Observatory and Leiden Observatory, which collaborated on the fruitful Palomar–Leiden survey in the 1960s. Gehrels used Palomar's Samuel Oschin telescope (also known as the 48-inch Schmidt Telescope), and shipped the photographic plates to Ingrid and Cornelis van Houten at Leiden Observatory. The trio are credited with the discovery of 4,620 minor planets.[7]

    The minor planet was named for the astronomical bibliography Astronomy and Astrophysics Abstracts (AAA). Since it was founded under the auspices of the International Astronomical Union in 1969, it has systematically described, documented and indexed more than half a millions astronomical and astrophysical documents and produced more than 60 volumes. Head of AAA was German astronomer Lutz Schmadel, also known for his Dictionary of Minor Planet Names, and after whom the minor planet 2234 Schmadel is named.[2] Naming citation was published on 1 June 1996 (M.P.C. 27331).[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 6805 Abstracta (4600 P-L)" (2015-06-11 last obs.). Jet Propulsion Laboratory. Retrieved 27 April 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (6805) Abstracta. Springer Berlin Heidelberg. p. 558. ISBN 978-3-540-00238-3. Retrieved 27 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (6805) Abstracta". Asteroid Lightcurve Database (LCDB). Retrieved 27 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 27 April 2016.
    5. 1 2 3 Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 27 April 2016.
    6. 1 2 "6805 Abstracta (4600 P-L)". Minor Planet Center. Retrieved 27 April 2016.
    7. ↑ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 13 January 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2016.

    External links

    This article is issued from Wikipedia - version of the 9/23/2016. The text is available under the Creative Commons Attribution/Share Alike but additional terms may apply for the media files.