19741 Callahan

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19741 Callahan
Discovery [1]
Discovered by LINEAR
Discovery site Lincoln Lab ETS
Discovery date5 January 2000
Designations
(19741) Callahan
Named after
Diane Callahan
(mentor at DCYSC) [2]
2000 AN141 ·1978 RQ8
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)
Aphelion 2.5407 AU
Perihelion 1.9559 AU
2.2483 AU
Eccentricity 0.1301
3.37 yr (1,231 days)
163.76°
0° 17m 32.64s / day
Inclination 8.0506°
167.39°
227.28°
Physical characteristics
Dimensions3.12 km (calculated) [4]
3.876±0.166 km [5] [6]
7.2684±0.0015 h [7]
0.20 (assumed) [4]
0.224±0.044 [5] [6]
S [4]
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.

    Contents

    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 ( U=2 ), 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]

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    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 19741 Callahan (2000 AN141)" (2017-05-01 last obs.). Jet Propulsion Laboratory . Retrieved 5 July 2017.
    2. 1 2 3 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. 1 2 3 "19741 Callahan (2000 AN141)". Minor Planet Center. Retrieved 22 March 2016.
    4. 1 2 3 4 5 6 "LCDB Data for (19741) Callahan". Asteroid Lightcurve Database (LCDB). Retrieved 17 May 2016.
    5. 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 17 May 2016.
    6. 1 2 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. arXiv: 1109.4096 . Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68 . Retrieved 3 December 2016.
    7. 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 17 May 2016.
    8. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 17 May 2016.
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