1768 Appenzella
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1768 Appenzella
| background = #D6D6D6
| image = 001768-asteroid shape model (1768) Appenzella.png
| image_scale =
| caption = Shape model of Appenzella from its lightcurve
| discovered = 23 September 1965
| discoverer = P. Wild
| discovery_site = Zimmerwald Obs.
| mpc_name = (1768) Appenzella
| alt_names = 1965 SA{{·}}1934 PM
1942 TH
| named_after = Appenzell {{small|(canton)}}
| mp_category = main-belt{{·}}Nysa
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 74.56 yr (27,232 days)
| aphelion = 2.8899 AU
| perihelion = 2.0141 AU
| semimajor = 2.4520 AU
| eccentricity = 0.1786
| period = 3.84 yr (1,402 days)
| mean_anomaly = 175.69°
| mean_motion = {{Deg2DMS|0.2567|sup=ms}} / day
| inclination = 3.2582°
| asc_node = 12.423°
| arg_peri = 19.718°
| dimensions = {{val|19.0|1.9}} km
{{val|19.30|0.17}} km
{{val|20.221|0.129}} km
{{val|20.86|2.3}} km {{small|(IRAS:2)}}
{{val|21|2}} km
| rotation = {{val|5.18335|0.00001}} h
{{val|5.1839|0.0001}} h
| albedo = {{val|0.03|0.01}}
{{val|0.032|0.007}}
{{nowrap|{{val|0.0338|0.009}} {{small|(IRAS:2)}}}}
{{val|0.039|0.008}}
{{val|0.04|0.01}}
| spectral_type = F {{small|(Tholen)}}
C {{small|(SMASS)}}
B–V = 0.615
U–B = 0.230
}}
1768 Appenzella (prov. designation: {{mp|1965 SA}}) is a rare-type Nysian asteroid from the inner regions of the asteroid belt, approximately 20 kilometers in diameter. It was discovered on 23 September 1965, by Swiss astronomer Paul Wild at Zimmerwald Observatory near Bern, Switzerland. It was later named after the Swiss canton of Appenzell.
Classification and orbit
Appenzella is a dark carbonaceous asteroid and a member of the Polanian subgroup of the Nysa family. On the Tholen taxonomic scheme, it belongs to the small group of 28 bodies known to have a F-type spectrum.
It orbits the Sun in the inner main-belt at a distance of 2.0–2.9 AU once every 3 years and 10 months (1,402 days). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic. The first used{{clarify|date=December 2023}} observation was made at the Finnish Turku Observatory in 1942, extending the asteroid's observation arc by 23 years prior to its discovery.
Lightcurve
In November 2011, a rotational lightcurve of Appenzella was obtained by French astronomer René Roy at his Blauvac Observatory (627) in southeastern France. Lightcurve analysis gave a well-defined rotation period of {{val|5.1839}} hours with a brightness variation of 0.53 magnitude ({{small|U=3}}). In 2016, remodeled photometric data from the Lowell database gave in a very similar period of 5.18335 hours.
Diameter and albedo
Based on the surveys carried out by NASA's Wide-field Infrared Survey Explorer and its subsequent NEOWISE mission, the asteroid measures between 19.0 and 21 kilometers in diameter and its surface has a low albedo between 0.03 and 0.04. The Collaborative Asteroid Lightcurve Link agrees with the results obtained by the Infrared Astronomical Satellite, IRAS, which found an albedo of 0.034 and a mean diameter of 20.9 kilometers, with an absolute magnitude of 12.7.
Naming
In 1971, Appenzella was named by the discoverer in honor of the rural Swiss canton of Appenzell, during the celebration of the 150th anniversary of the public middle school "Kantonsschule Trogen", Appenzell Ausserrhoden, founded in 1821. The official {{MoMP|1768|naming citation}} was published by the Minor Planet Center on 1 July 1972 ({{small|M.P.C. 3297}}).
References
{{reflist|refs=
|type = 2017-03-30 last obs.
|title = JPL Small-Body Database Browser: 1768 Appenzella (1965 SA)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001768
|publisher = Jet Propulsion Laboratory
|access-date = 1 July 2017}}
|title = Dictionary of Minor Planet Names – (1768) Appenzella
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 141
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1769 |chapter = (1768) Appenzella }}
|title = 1768 Appenzella (1965 SA)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1768
|access-date = 10 August 2016}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008)
|chapter = Appendix – Publication Dates of the MPCs
|last = Schmadel |first=Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 221
|isbn = 978-3-642-01964-7
|doi = 10.1007/978-3-642-01965-4}}
|title = Asteroids and comets rotation curves – (1768) Appenzella
|last = Behrend |first = Raoul
|publisher = Geneva Observatory
|url = http://obswww.unige.ch/~behrend/page4cou.html#001768
|access-date = 10 August 2016}}
|title = Kanstonsschule Trogen
|url = http://www.kst.ch/startseite.html
|work = Kantonsschule Trogen
|language = German
|date = 2014
|access-date = 14 January 2016
|archive-url = https://archive.today/20150525035311/http://www.kst.ch/startseite.html
|archive-date = 25 May 2015
}}
|title = JPL Small-Body Database Search Engine: [ spec. type
|publisher = JPL Solar System Dynamics
|url = http://ssd.jpl.nasa.gov/sbdb_query.cgi?obj_group=all;obj_kind=all;obj_numbered=all;OBJ_field=0;ORB_field=0;combine_mode=OR;c1_group=OBJ;c1_item=Ay;c1_op=%3D;c1_value=F;c2_group=OBJ;c2_item=Ax;c2_op=%3D;c2_value=F;table_format=HTML;max_rows=100;format_option=comp;c_fields=AcBhBgBjBiBnBsAiArApAxAy;.cgifields=format_option;.cgifields=obj_kind;.cgifields=obj_group;.cgifields=obj_numbered;.cgifields=combine_mode;.cgifields=ast_orbit_class;.cgifields=table_format;.cgifields=com_orbit_class&query=1&c_sort=AcA |access-date = 10 August 2016}}
|first1 = E. F. |last1 = Tedesco
|first2 = P. V. |last2 = Noah
|first3 = M. |last3 = Noah
|first4 = S. D. |last4 = Price
|date = October 2004
|title = IRAS Minor Planet Survey V6.0
|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab
|journal = NASA Planetary Data System
|volume = 12
|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0
|bibcode = 2004PDSS...12.....T
|access-date = 22 October 2019}}
|title = LCDB Data for (1768) Appenzella
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1768%7CAppenzella
|access-date = 10 August 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 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
|access-date= 10 August 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
|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}}
|display-authors = 6
|first1 = V. |last1 = Alí-Lagoa
|first2 = J. |last2 = de León
|first3 = J. |last3 = Licandro
|first4 = M. |last4 = Delbó
|first5 = H. |last5 = Campins
|first6 = N. |last6 = Pinilla-Alonso
|first7 = M. S. |last7 = Kelley
|date = June 2013
|title = Physical properties of B-type asteroids from WISE data
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2013A&A...554A..71A
|journal = Astronomy and Astrophysics
|volume = 554
|page = 16
|bibcode = 2013A&A...554A..71A
|doi = 10.1051/0004-6361/201220680
|arxiv = 1303.5487
|access-date= 10 August 2016}}
|display-authors = 6
|first1 = V. |last1 = Alí-Lagoa
|first2 = J. |last2 = Licandro
|first3 = R. |last3 = Gil-Hutton
|last4 = Cañ
|first5 = M. |last5 = ada-Assandri
|first6 = M. |last6 = Delbo'
|first7 = J. |last7 = de León
|first8 = H. |last8 = Campins
|first9 = N. |last9 = Pinilla-Alonso
|first10 = M. S. P. |last10 = Kelley
|first11 = J. |last11 = Hanus
|date = June 2016
|title = Differences between the Pallas collisional family and similarly sized B-type asteroids
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...591A..14A
|journal = Astronomy and Astrophysics
|volume = 591
|page = 11
|bibcode = 2016A&A...591A..14A
|doi = 10.1051/0004-6361/201527660
|access-date= 10 August 2016|doi-access= free
|hdl= 11336/63614
|hdl-access= free
}}
|first1 = J. |last1 = Durech
|first2 = J. |last2 = Hanus
|first3 = D. |last3 = Oszkiewicz
|first4 = R. |last4 = Vanco
|date = March 2016
|title = Asteroid models from the Lowell photometric database
|url = http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2016A&A...587A..48D
|journal = Astronomy and Astrophysics
|volume = 587
|page = 6
|bibcode = 2016A&A...587A..48D
|doi = 10.1051/0004-6361/201527573
|arxiv = 1601.02909
|access-date= 10 August 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= 8 December 2016}}
}}
External links
- [http://casjobs.sdss.org/ImgCutoutDR6/getjpeg.aspx?ra=137.09276&dec=21.43212&scale=0.09903175&width=800&height=200&opt=L&query=&Label=on Image from SDSS survey, 1.55au from Earth on 15DEC2004 Fermats Brother]
- [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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1768}}
- {{JPL small body}}
{{Minor planets navigator |1767 Lampland |number=1768 |1769 Carlostorres}}
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{{Authority control}}
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Category:C-type asteroids (SMASS)