19741 Callahan
| Discovery [1] | |
|---|---|
| Discovered by | LINEAR |
| Discovery site | Magdalena Ridge Obs. |
| Discovery date | 5 January 2000 |
| Designations | |
| MPC designation | 19741 Callahan |
Named after |
Diane Callahan (Discovery Channel Youth Science Challenge)[2] |
| 2000 AN141 · 1978 RQ8 | |
| main-belt [3] · (inner) [4] | |
| Orbital characteristics [1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 37.33 yr (13,634 days) |
| Aphelion | 2.5406 AU |
| Perihelion | 1.9543 AU |
| 2.2474 AU | |
| Eccentricity | 0.1304 |
| 3.37 yr (1,231 days) | |
| 348.48° | |
| 0° 17m 33s / day | |
| Inclination | 8.0526° |
| 167.39° | |
| 227.06° | |
| Physical characteristics | |
| Dimensions |
3.876±0.166 km[5] 3.12 km (calculated)[4] |
| 7.2684±0.0015 h[6] | |
|
0.2240±0.0439[5] 0.20 (assumed)[4] | |
| S [4] | |
|
14.4[1] 14.3[5] 14.89[4] 14.444±0.004[6] | |
|
| |
19741 Callahan, provisional designation 2000 AN141, is a stony asteroid from the inner regions of the asteroid belt, about 3 to 4 kilometers in diameter. It was discovered on 5 January 2000, by the Lincoln Near-Earth Asteroid Research, LINEAR, at the U.S. Magdalena Ridge Observatory in New Mexico.[3]
The S-type asteroid orbits the Sun 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]
In 2009, a photometric light-curve analysis at the U.S. Palomar Transient Factory, California, rendered a rotation period of 7.2684±0.0015 hours with a relatively high brightness amplitude of 0.81 in magnitude (U=2), indicative of a non-spheroidal shape.[6] According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 3.9 kilometers in diameter and its surface has an albedo of 0.22.[5] The Collaborative Asteroid Lightcurve Link (CALL) assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 3.1 kilometers, based on an absolute magnitude of 14.89.[4]
The 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]
References
- 1 2 3 4 "JPL Small-Body Database Browser: 19741 Callahan (2000 AN141)" (2015-12-31 last obs.). Jet Propulsion Laboratory. Retrieved March 2016.
- 1 2 Schmadel, Lutz D. (2006). Dictionary of Minor Planet Names – (19741) Callahan, Addendum to Fifth Edition: 2003–2005. Springer Berlin Heidelberg. p. 142. ISBN 978-3-540-34360-8. Retrieved March 2016.
- 1 2 "19741 Callahan (2000 AN141)". Minor Planet Center. Retrieved March 2016.
- 1 2 3 4 5 6 "LCDB Data for (19741) Callahan". Asteroid Lightcurve Database (LCDB). Retrieved March 2016.
- 1 2 3 4 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. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved March 2016.
- 1 2 3 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. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved March 2016.
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 the JPL Small-Body Database
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