6805 Abstracta
{{Short description|Carbonaceous Themistian asteroid and slow rotator from the outer region of the asteroid belt}}
{{Use dmy dates|date=April 2018}}
{{Infobox planet
| minorplanet = yes
| name = 6805 Abstracta
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 24 September 1960
| discoverer = C. J. van Houten
I. van Houten
T. Gehrels
| discovery_site = Palomar Obs.
| mpc_name = (6805) Abstracta
| pronounced = {{IPAc-en|æ|b|ˈ|s|t|r|æ|k|t|ə}}per {{OED|abstractable}}
| alt_names = 4600 P-L{{·}}{{mp|1988 RG|11}}
| named_after = Astronomy and Astrophysics Abstracts
| mp_category = main-belt{{·}}Themis
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 67.00 yr (24,472 days)
| aphelion = 3.6852 AU
| perihelion = 2.6917 AU
| semimajor = 3.1885 AU
| eccentricity = 0.1558
| period = 5.69 yr (2,080 days)
| mean_anomaly = 281.84°
| mean_motion = {{Deg2DMS|0.1731|sup=ms}} / day
| inclination = 1.8950°
| asc_node = 136.68°
| arg_peri = 338.24°
| dimensions = 8.41 km {{small|(calculated)}}
{{val|11.870|0.246}} km
| rotation = {{val|152.1834|0.8953}} h
| albedo = 0.08 {{small|(assumed)}}
{{val|0.087|0.026}}
| spectral_type = C
| abs_magnitude = 13.0{{·}}12.9{{·}}13.74{{·}}{{val|13.286|0.009}} {{small|(R)}}
}}
6805 Abstracta, provisional designation {{mp|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 Palomar Observatory in California, United States. The asteroid was named for the astronomical bibliography Astronomy and Astrophysics Abstracts.
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. The first precovery was taken at Palomar Observatory in 1949, extending the asteroid's observation arc by 11 years prior to its discovery.
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.
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 {{val|152.1834|0.8953}} hours with a brightness amplitude of 0.78 in magnitude ({{small|U=2}}).
= 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. 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.
Naming
This 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. The official naming citation was published by the Minor Planet Center on 1 June 1996 {{small|(M.P.C. 27331)}}.
References
{{reflist|30em|refs=
|type = 2016-11-23 last obs.
|title = JPL Small-Body Database Browser: 6805 Abstracta (4600 P-L)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006805
|archive-url = https://web.archive.org/web/20200918055614/https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2006805
|archive-date = 18 September 2020
|publisher = Jet Propulsion Laboratory
|access-date = 21 June 2017}}
|title = Dictionary of Minor Planet Names – (6805) Abstracta
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 558
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_6115 |chapter = (6805) Abstracta }}
|title = 6805 Abstracta (4600 P-L)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=6805
|access-date = 27 April 2016}}
|title = LCDB Data for (6805) Abstracta
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=6805%7CAbstracta
|access-date = 27 April 2016}}
|title = Minor Planet Discoverers
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/lists/MPDiscsNum.html
|date = 24 April 2016
|access-date = 13 January 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 27 April 2016}}
|display-authors = 6
|first1 = A. |last1 = Mainzer
|first2 = T. |last2 = Grav
|first3 = J. |last3 = Masiero
|first4 = E. |last4 = Hand
|first5 = J. |last5 = Bauer
|first6 = D. |last6 = Tholen
|first7 = R. S. |last7 = McMillan
|first8 = T. |last8 = Spahr
|first9 = R. M. |last9 = Cutri
|first10 = E. |last10 = Wright
|first11 = J. |last11 = Watkins
|first12 = W. |last12 = Mo
|first13 = C. |last13 = Maleszewski
|date = November 2011
|title = NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 25
|bibcode = 2011ApJ...741...90M
|doi = 10.1088/0004-637X/741/2/90
|arxiv = 1109.6407
|access-date= 27 April 2016}}
|display-authors = 6
|first1 = Adam |last1 = Waszczak
|first2 = Chan-Kao |last2 = Chang
|first3 = Eran O. |last3 = Ofek
|first4 = Russ |last4 = Laher
|first5 = Frank |last5 = Masci
|first6 = David |last6 = Levitan
|first7 = Jason |last7 = Surace
|first8 = Yu-Chi |last8 = Cheng
|first9 = Wing-Huen |last9 = Ip
|first10 = Daisuke |last10 = Kinoshita
|first11 = George |last11 = Helou
|first12 = Thomas A. |last12 = Prince
|first13 = Shrinivas |last13 = Kulkarni
|date = September 2015
|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W
|journal = The Astronomical Journal
|volume = 150
|issue = 3
|page = 35
|bibcode = 2015AJ....150...75W
|doi = 10.1088/0004-6256/150/3/75
|arxiv = 1504.04041
|access-date= 27 April 2016}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = J. |last6 = Dailey
|first7 = P. R. M. |last7 = Eisenhardt
|first8 = R. S. |last8 = McMillan
|first9 = T. B. |last9 = Spahr
|first10 = M. F. |last10 = Skrutskie
|first11 = D. |last11 = Tholen
|first12 = R. G. |last12 = Walker
|first13 = E. L. |last13 = Wright
|first14 = E. |last14 = DeBaun
|first15 = D. |last15 = Elsbury
|first16 = T. IV |last16 = Gautier
|first17 = S. |last17 = Gomillion
|first18 = A. |last18 = Wilkins
|date = November 2011
|title = Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M
|journal = The Astrophysical Journal
|volume = 741
|issue = 2
|page = 20
|bibcode = 2011ApJ...741...68M
|doi = 10.1088/0004-637X/741/2/68
|arxiv = 1109.4096
|access-date= 5 December 2016}}
}}
External links
- [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
- {{AstDys|6805}}
- {{JPL small body}}
{{Minor planets navigator |6804 Maruseppu |number=6805 |6806 Kaufmann}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Abstracta}}
Category:Discoveries by Cornelis Johannes van Houten
Category:Discoveries by Ingrid van Houten-Groeneveld