19741 Callahan
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 19741 Callahan
| background = #D6D6D6
| image =
| image_size =
| caption =
| discovered = 5 January 2000
| discoverer = LINEAR
| discovery_site = Lincoln Lab ETS
| mpc_name = (19741) Callahan
| alt_names = {{nowrap|{{mp|2000 AN|141}}{{·}}{{mp|1978 RQ|8}}}}
| named_after = Diane Callahan
{{small|(mentor at DCYSC)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
background
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 38.66 yr (14,121 days)
| aphelion = 2.5407 AU
| perihelion = 1.9559 AU
| semimajor = 2.2483 AU
| eccentricity = 0.1301
| period = 3.37 yr (1,231 days)
| mean_anomaly = 163.76°
| mean_motion = {{Deg2DMS|0.2924|sup=ms}} / day
| inclination = 8.0506°
| asc_node = 167.39°
| arg_peri = 227.28°
| dimensions = 3.12 km {{small|(calculated)}}
{{val|3.876|0.166}} km
| rotation = {{val|7.2684|0.0015}} h
| albedo = 0.20 {{small|(assumed)}}
{{val|0.224|0.044}}
| spectral_type = S
| abs_magnitude = 14.3{{·}}14.4{{·}}{{val|14.444|0.004}}{{·}}14.89
}}
19741 Callahan (provisional designation {{mp|2000 AN|141}}) is a stony background asteroid from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter.
It was discovered on 5 January 2000, by the Lincoln Near-Earth Asteroid Research, LINEAR, at the Lincoln Laboratory's Experimental Test Site, Socorro, New Mexico, and named after a mentor of the 2003 Discovery Channel Young Scientist Challenge.
Orbit and classification
The S-type asteroid orbits the Sun in the inner main-belt at a distance of 2.0–2.5 AU once every 3 years and 4 months (1,231 days). Its orbit has an eccentricity of 0.13 and an inclination of 8° with respect to the ecliptic. Callahan was first identified as {{mp|1978 RQ8}} at ESO's La Silla Observatory in 1978, which extends the asteroid's observation arc by 22 years prior to its official discovery observation.
Physical characteristics
In December 2009, a rotational lightcurve for this asteroid was obtained from photometric observations at the U.S. Palomar Transient Factory, California. It gave a rotation period of {{val|7.2684|0.0015}} hours with a relatively high brightness variation of 0.81 in magnitude ({{small|U=2}}), indicative of a non-spherical shape.
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Callahan measures 3.9 kilometers in diameter and its surface has an albedo of 0.22. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.1 kilometers, with an absolute magnitude of 14.89.
Naming
This minor planet was named after Diane Callahan, teacher at U.S. Fairfield Middle School, Ohio, who mentored a finalist in the 2003 Discovery Channel Youth Science Challenge (DCYSC), a middle school science competition. The approved naming citation was published by the Minor Planet Center on 10 October 2003 ({{small|M.P.C. 49772}}).
References
{{reflist|refs=
|type = 2017-05-01 last obs.
|title = JPL Small-Body Database Browser: 19741 Callahan (2000 AN141)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2019741
|publisher = Jet Propulsion Laboratory
|access-date = 5 July 2017}}
|title = Dictionary of Minor Planet Names – (19741) Callahan, Addendum to Fifth Edition: 2003–2005
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 142
|date = 2006
|isbn = 978-3-540-34360-8
|doi = 10.1007/978-3-540-34361-5_1597 |chapter = (19741) Callahan [2.25, 0.13, 8.0] }}
|title = 19741 Callahan (2000 AN141)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=19741
|access-date = 22 March 2016}}
|title = MPC/MPO/MPS Archive
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html
|access-date = 17 May 2016}}
|title = LCDB Data for (19741) Callahan
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=19741%7CCallahan
|access-date = 17 May 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= 17 May 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= 17 May 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= 3 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/NumberedMPs015001.html Discovery Circumstances: Numbered Minor Planets (15001)-(20000)] – Minor Planet Center
- {{AstDys|19741}}
- {{JPL small body}}
{{Minor planets navigator | |number=19741 | }}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Callahan}}