6805 Abstracta

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6805 Abstracta
Discovery  [1]
Discovered by C. J. van Houten
I. van Houten
T. Gehrels
Discovery site Palomar Obs.
Discovery date24 September 1960
Designations
(6805) Abstracta
Pronunciation /æbˈstræktə/ [2]
Named after
Astronomy and Astrophysics Abstracts  [3]
4600 P-L ·1988 RG11
main-belt  · Themis   [4]
Orbital characteristics   [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 67.00 yr (24,472 days)
Aphelion 3.6852 AU
Perihelion 2.6917 AU
3.1885 AU
Eccentricity 0.1558
5.69 yr (2,080 days)
281.84°
0° 10m 23.16s / day
Inclination 1.8950°
136.68°
338.24°
Physical characteristics
Dimensions8.41 km (calculated) [4]
11.870±0.246 km [5] [6]
152.1834±0.8953 h [7]
0.08 (assumed) [4]
0.087±0.026 [5] [6]
C   [4]
13.0 [1]  ·12.9 [5]  ·13.74 [4]  ·13.286±0.009(R) [7]

    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.

    Contents

    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 Palomar Observatory in California, United States. [8] The asteroid was named for the astronomical bibliography Astronomy and Astrophysics Abstracts. [3]

    Orbit and classification

    Abstracta is a member of the Themis family, a dynamical family of outer-belt asteroids with nearly coplanar ecliptical orbits. It orbits the Sun in the outer main-belt at a distance of 2.7–3.7  AU once every 5 years and 8 months (2,080 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. [8]

    The survey 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 several thousand minor planets. [9]

    Physical characteristics

    Lightcurve

    A rotational lightcurve of Abstracta 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 ). [7]

    Diameter and albedo

    According to the NEOWISE mission of NASA's space-based Wide-field Infrared Survey Explorer, Abstracta measures 11.9 kilometers in diameter and its surface has a low albedo of 0.09. [5] [6] 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 with an absolute magnitude of 13.74. [4]

    Naming

    This minor planet was named for the astronomical bibliography Astronomy and Astrophysics Abstracts (AAA). [3]

    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. [3] The official naming citation was published by the Minor Planet Center on 1 June 1996 (M.P.C. 27331). [10]

    Related Research Articles

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    <span class="mw-page-title-main">1743 Schmidt</span> Asteroid

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    <span class="mw-page-title-main">9994 Grotius</span> Rafita asteroid

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    8776 Campestris, provisional designation 2287 T-3, is a stony background asteroid from the central region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 16 October 1977, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden Observatory, and Dutch–American astronomer Tom Gehrels at the Palomar Observatory in California, United States. The asteroid was named for the tawny pipit, a shorebird.

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    <span class="mw-page-title-main">9910 Vogelweide</span>

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    <span class="mw-page-title-main">9909 Eschenbach</span>

    9909 Eschenbach, provisional designation 4355 T-1, is a Florian asteroid from the inner regions of the asteroid belt, roughly 10 kilometers in diameter.

    <span class="mw-page-title-main">10656 Albrecht</span>

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    8121 Altdorfer, provisional designation 2572 P-L, is a stony Flora asteroid from the inner regions of the asteroid belt, approximately 2 kilometers in diameter. Discovered during the Palomar–Leiden survey in 1960, the asteroid was later named for Renaissance painter Albrecht Altdorfer.

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    10660 Felixhormuth, provisional designation 4348 T-1, is a background asteroid from the outer regions of the asteroid belt, approximately 7 kilometers in diameter. It was discovered on 26 March 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at Palomar Observatory in California, United States. The asteroid was named after German astronomer Felix Hormuth.

    2054 Gawain, provisional designation 4097 P-L, is a dark and elongated asteroid from the outer regions of the asteroid belt, approximately 19 kilometers in diameter. Discovered during the Palomar–Leiden survey at Palomar Observatory in 1960, the asteroid was later named after Gawain, a knight of King Arthur's Round Table in the Arthurian legend.

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    1924 Horus, provisional designation 4023 P-L, is a dark asteroid from the inner regions of the asteroid belt, approximately 12 kilometers in diameter. Discovered during the Palomar–Leiden survey in 1960, it was later named after Horus from Egyptian mythology.

    1979 Sakharov, provisionally designated 2006 P-L, is a stony Vestian asteroid from the inner regions of the asteroid belt, approximately 4.5 kilometers in diameter. It was discovered during the Palomar–Leiden survey in 1960, and named after Russian physicist Andrei Sakharov.

    1778 Alfvén, also designated 4506 P-L, is a carbonaceous Themistian asteroid from the outer region of the asteroid belt, approximately 20 kilometers in diameter.

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 6805 Abstracta (4600 P-L)" (2016-11-23 last obs.). Jet Propulsion Laboratory. Archived from the original on 18 September 2020. Retrieved 21 June 2017.
    2. ↑ per "abstractable" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    3. 1 2 3 4 Schmadel, Lutz D. (2007). "(6805) Abstracta". Dictionary of Minor Planet Names – (6805) Abstracta. Springer Berlin Heidelberg. p. 558. doi:10.1007/978-3-540-29925-7_6115. ISBN   978-3-540-00238-3.
    4. 1 2 3 4 5 6 "LCDB Data for (6805) Abstracta". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2016.
    5. 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: 1109.6407 . Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90 . Retrieved 27 April 2016.
    6. 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: 1109.4096 . Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68 . Retrieved 5 December 2016.
    7. 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: 1504.04041 . Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75 . Retrieved 27 April 2016.
    8. 1 2 "6805 Abstracta (4600 P-L)". Minor Planet Center. Retrieved 27 April 2016.
    9. ↑ "Minor Planet Discoverers". Minor Planet Center. 24 April 2016. Retrieved 13 January 2016.
    10. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2016.
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