Astronomy:19741 Callahan
| Discovery[1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Lincoln Lab ETS |
| Discovery date | 5 January 2000 |
| Designations | |
| (19741) Callahan | |
| Named after | Diane Callahan (mentor at DCYSC)[2] |
| 2000 AN141 · 1978 RQ8 | |
| Minor planet category | main-belt[3] · (inner)[4] background |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 38.66 yr (14,121 days) |
| |{{{apsis}}}|helion}} | 2.5407 AU |
| |{{{apsis}}}|helion}} | 1.9559 AU |
| 2.2483 AU | |
| Eccentricity | 0.1301 |
| Orbital period | 3.37 yr (1,231 days) |
| Mean anomaly | 163.76° |
| Mean motion | 0° 17m 32.64s / day |
| Inclination | 8.0506° |
| Longitude of ascending node | 167.39° |
| 227.28° | |
| Physical characteristics | |
| Dimensions | 3.12 km (calculated)[4] 3.876±0.166 km[5][6] |
| Rotation period | 7.2684±0.0015 h[7] |
| Geometric albedo | 0.20 (assumed)[4] 0.224±0.044[5][6] |
| S[4] | |
| Absolute magnitude (H) | 14.3[5] · 14.4[1] · 14.444±0.004[7] · 14.89[4] |
19741 Callahan (provisional designation 2000 AN141) 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.[2][3]
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.[1] Callahan was first identified as 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.[3]
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 7.2684±0.0015 hours with a relatively high brightness variation of 0.81 in magnitude ({{{1}}}), indicative of a non-spherical shape.[7]
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.[5] 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.[4]
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.[2] The approved naming citation was published by the Minor Planet Center on 10 October 2003 (M.P.C. 49772).[8]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 19741 Callahan (2000 AN141)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2019741.
- ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2006). "(19741) Callahan [2.25, 0.13, 8.0]". Dictionary of Minor Planet Names – (19741) Callahan, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 142. doi:10.1007/978-3-540-34361-5_1597. ISBN 978-3-540-34360-8.
- ↑ 3.0 3.1 3.2 "19741 Callahan (2000 AN141)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=19741.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 "LCDB Data for (19741) Callahan". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=19741%7CCallahan.
- ↑ 5.0 5.1 5.2 5.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...90M. Retrieved 17 May 2016.
- ↑ 6.0 6.1 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 3 December 2016.
- ↑ 7.0 7.1 7.2 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. doi:10.1088/0004-6256/150/3/75. Bibcode: 2015AJ....150...75W. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015AJ....150...75W. Retrieved 17 May 2016.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
External links
- Asteroid Lightcurve Database (LCDB), query form (info )
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (15001)-(20000) – Minor Planet Center
- 19741 Callahan at AstDyS-2, Asteroids—Dynamic Site
- 19741 Callahan at the JPL Small-Body Database
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