9423 Abt

9423 Abt
Discovery [1]
Discovered by Spacewatch
Discovery site Kitt Peak Obs.
Discovery date 12 January 1996
Designations
MPC designation 9423 Abt
Named after
 Helmut Abt (astronomer)[2]
1996 AT7 · 1974 DU
1981 US15 · 1983 CK8
1990 VH15 · 1992 DP2
main-belt · (middle) [3]
Orbital characteristics [1]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 0
Observation arc 42.73 yr (15,606 days)
Aphelion 2.9683 AU
Perihelion 2.4188 AU
2.6935 AU
Eccentricity 0.1020
4.42 yr (1,615 days)
69.638°
0° 13m 22.8s / day
Inclination 8.8469°
106.16°
219.34°
Physical characteristics
Dimensions 12.690±0.145 km[4][5]
12.84±0.86 km[6]
13.29 km (calculated)[3]
3.2766±0.0003 h[7]
3.281±0.005 h[8]
0.10 (assumed)[3]
0.132±0.012[4][5]
0.141±0.020[6]
S [3]
12.5[1][3] · 12.20[6] · 12.3[4] · 12.516±0.003 (R)[7] · 12.15±0.31[9]

    9423 Abt, provisional designation 1996 AT7, is a stony asteroid from the middle region of the asteroid belt, about 13 kilometers in diameter. It was discovered by the U.S. Spacewatch project of the University of Arizona at Kitt Peak National Observatory, on 12 January 1996.[10]

    The S-type asteroid orbits the Sun at a distance of 2.4–3.0 AU once every 4 years and 5 months (1,615 days). Its orbit has an eccentricity of 0.10 and an inclination of 9° with respect to the ecliptic.[1] The first precovery was taken at Crimea-Nauchnij in 1974, extending the asteroid's observation arc by 22 years prior to its discovery.[10]

    A photometric light-curve observation at Hunters Hill Observatory, Australia, in 2006, gave it a rotation period of 3.281±0.005 hours with a brightness variation of 0.30 in magnitude (U=3).[8] A second light-curve analysis at the Palomar Transient Factory in 2012, rendered a concurring period of 3.2766±0.0003 hours with an amplitude of 0.33 in magnitude (U=2).[7]

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of the NASA's Wide-field Infrared Survey Explorer, the asteroid's surface has an albedo of 0.14 and 0.13, respectively. The Collaborative Asteroid Lightcurve Link (CALL) assumes an albedo of 0.10, which is untypically low for stony bodies. Both, the space-based surveys and CALL agree closely on a diameter estimate in the range of 12.69 to 13.29 kilometers.[3][6][4][5]

    The minor planet was named after American astronomer Helmut Abt (b. 1925), one of the founders of the discovering Kitt Peak National Observatory, after which the minor planet 2322 Kitt Peak is named. His research included stellar properties and systems. As senior editor of The Astrophysical Journal he was responsible for converting it into its digital format.[2] Naming citation was published on 11 November 2000 (M.P.C. 41568).[11]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 9423 Abt (1996 AT7)" (2016-11-08 last obs.). Jet Propulsion Laboratory. Retrieved 4 December 2016.
    2. 1 2 Schmadel, Lutz D. (2007). Dictionary of Minor Planet Names – (9423) Abt. Springer Berlin Heidelberg. p. 692. ISBN 978-3-540-00238-3. Retrieved 27 April 2016.
    3. 1 2 3 4 5 6 "LCDB Data for (9423) Abt". Asteroid Lightcurve Database (LCDB). Retrieved 27 April 2016.
    4. 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:1109.6407Freely accessible. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90. Retrieved 27 April 2016.
    5. 1 2 3 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:1109.4096Freely accessible. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 4 December 2016.
    6. 1 2 3 4 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi; et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan. 63 (5): 1117–1138. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 12 January 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:1504.04041Freely accessible. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 27 April 2016.
    8. 1 2 Higgins, David; Pravec, Petr; Kusnirak, Peter; Galad, Adrian; Kornos, Leos; Pray, Donald; et al. (December 2006). "Asteriod [sic] lightcurve analysis at Hunters Hill Observatory and collaborating stations - autumn 2006". The Minor Planet Bulletin. 33 (4): 89–91. Bibcode:2006MPBu...33...89H. ISSN 1052-8091. Retrieved 12 January 2016.
    9. ↑ Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762Freely accessible. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 27 April 2016.
    10. 1 2 "9423 Abt (1996 AT7)". Minor Planet Center. Retrieved 27 April 2016.
    11. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 27 April 2016.

    External links

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