1205 Ebella
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1205 Ebella
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 6 October 1931
| discoverer = K. Reinmuth
| discovery_site = Heidelberg Obs.
| mpc_name = (1205) Ebella
| alt_names = {{mp|1931 TB|1}}{{·}}1970 JT
| pronounced =
| named_after = Martin Ebell
{{small|(German astronomer)}}
| mp_category = main-belt{{·}}{{small|(middle)}}
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 85.48 yr (31,221 days)
| aphelion = 3.2287 AU
| perihelion = 1.8411 AU
| semimajor = 2.5349 AU
| eccentricity = 0.2737
| period = 4.04 yr (1,474 days)
| mean_anomaly = 103.87°
| mean_motion = {{Deg2DMS|0.2442|sup=ms}} / day
| inclination = 8.8616°
| asc_node = 23.083°
| arg_peri = 349.24°
| dimensions = {{val|5.474|0.283}} km
6.0 km {{small|(est. at 0.20)}}
| rotation =
| albedo = {{val|0.214|0.026}}
| spectral_type =
}}
1205 Ebella (provisional designation {{mp|1931 TB|1}}) is a relatively eccentric asteroid from the central regions of the asteroid belt, approximately 5.5 kilometers in diameter. It was discovered by astronomer Karl Reinmuth at Heidelberg Observatory on 6 October 1931. The asteroid was named after German astronomer Martin Ebell.
Orbit and classification
Ebella orbits the Sun in the central main-belt at a distance of 1.8–3.2 AU once every 4.04 years (1,474 days). Its orbit has an eccentricity of 0.27 and an inclination of 9° with respect to the ecliptic. As no precoveries were taken and no prior identifications were made, the asteroid's observation arc begins at Heidelberg with its official discovery observation.
Physical characteristics
= Diameter and albedo =
According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ebella measures 5.474 kilometers in diameter and its surface has an albedo of 0.214, which is typical for stony S-type asteroids.
Based on a generic magnitude-to-diameter conversion, it measures 6.0 kilometers in diameter using an absolute magnitude of 13.50 with an assumed albedo of 0.20.
= Lightcurve =
As of 2017, no rotational lightcurve of Ebella has been obtained from photometric observations. The asteroid's rotation period, poles and shape still remain unknown.
Naming
This minor planet was named after Carl Wilhelm Ludwig Martin Ebell (1871–1944) an astronomer from Neuruppin, Germany, who was on the editorial team of the renowned astronomical journal Astronomische Nachrichten. The official naming citation was published by Paul Herget in The Names of the Minor Planets in 1955 ({{small|H 112}}).
References
{{reflist|30em|refs=
|type = 2017-03-29 last obs.
|title = JPL Small-Body Database Browser: 1205 Ebella (1931 TB1)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001205
|publisher = Jet Propulsion Laboratory
|access-date = 5 August 2017}}
|title = Dictionary of Minor Planet Names – (1205) Ebella
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 101
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1206 |chapter = (1205) Ebella }}
|title = 1205 Ebella (1931 TB1)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1205
|access-date = 5 August 2017}}
|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 August 2017}}
|title = Asteroid Size Estimator
|publisher = CNEOS/JPL
|url = https://cneos.jpl.nasa.gov/tools/ast_size_est.html
|access-date= 5 August 2017}}
|title = LCDB Data for (1205) Ebella
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1205%7CEbella
|access-date = 5 August 2017}}
}}
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/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1205}}
- {{JPL small body}}
{{Minor planets navigator |1204 Renzia |number=1205 |1206 Numerowia}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Ebella}}