Astronomy:9423 Abt
| Discovery [1] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 12 January 1996 |
| Designations | |
| (9423) Abt | |
| Named after | Helmut Abt (American astrophysicist)[2] |
| 1996 AT7 · 1974 DU 1981 US15 · 1983 CK8 1990 VH15 · 1992 DP2 | |
| Minor planet category | main-belt · (middle) [3] background |
| Orbital characteristics [1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 42.95 yr (15,686 days) |
| |{{{apsis}}}|helion}} | 2.9681 AU |
| |{{{apsis}}}|helion}} | 2.4182 AU |
| 2.6932 AU | |
| Eccentricity | 0.1021 |
| Orbital period | 4.42 yr (1,614 days) |
| Mean anomaly | 114.30° |
| Mean motion | 0° 13m 22.8s / day |
| Inclination | 8.8476° |
| Longitude of ascending node | 106.16° |
| 219.27° | |
| Physical characteristics | |
| Dimensions | 12.690±0.145 km[4][5] 12.84±0.86 km[6] 13.29 km (calculated)[3] |
| Rotation period | 3.2766±0.0003 h[7] 3.281±0.005 h[8] |
| Geometric albedo | 0.10 (assumed)[3] 0.132±0.012[4][5] 0.141±0.020[6] |
| S [3] | |
| Absolute magnitude (H) | 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 background asteroid from the central region of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 12 January 1996, by the Spacewatch project of the University of Arizona at Kitt Peak National Observatory, United States.[10] The asteroid was named after American astronomer Helmut Abt.
Orbit and classification
Abt is a non-family asteroid from the main belt's background population. It orbits the Sun in the central main-belt at a distance of 2.4–3.0 AU once every 4 years and 5 months (1,614 days). Its orbit has an eccentricity of 0.10 and an inclination of 9° with respect to the ecliptic.[1] It was first identified as 1974 DU at Crimea-Nauchnij in February 1974, extending the body's observation arc by 22 years prior to its official discovery observation at Kitt Peak.[10]
Naming
This minor planet was named after American astrophysicist Helmut Abt (born 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] The official naming citation was published by the Minor Planet Center on 11 November 2000 (M.P.C. 41568).[11]
Physical characteristics
Rotation period
In 2006, a rotational lightcurve of Abt was obtained from photometric observation at Hunters Hill Observatory, Australia. Lightcurve analysis gave a well-defined rotation period of 3.281 hours with a brightness variation of 0.30 magnitude ({{{1}}}).[8]
In 2012, a second lightcurve from the Palomar Transient Factory, California, gave a concurring period of 3.2766 hours with an amplitude of 0.33 magnitude ({{{1}}}).[7]
Diameter and albedo
According to the surveys carried out by the NEOWISE mission of the NASA's Wide-field Infrared Survey Explorer and the Japanese Akari satellite, Abt measures 12.690 and 12.84 kilometers in diameter, and its surface has an albedo of 0.132 and 0.141, respectively.[4][5][6]
The Collaborative Asteroid Lightcurve Link calculates a diameter of 13.29 kilometers, assuming an albedo of 0.10, a compromise figure between the brighter stony and darker carbonaceous bodies from the inner and outer asteroid-belt, respectively.[3]
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 9423 Abt (1996 AT7)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2009423.
- ↑ 2.0 2.1 Schmadel, Lutz D. (2007). "(9423) Abt". Dictionary of Minor Planet Names – (9423) Abt. Springer Berlin Heidelberg. p. 692. doi:10.1007/978-3-540-29925-7_7509. ISBN 978-3-540-00238-3.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "LCDB Data for (9423) Abt". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=9423%7CAbt.
- ↑ 4.0 4.1 4.2 4.3 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 27 April 2016.
- ↑ 5.0 5.1 5.2 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. 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 4 December 2016.
- ↑ 6.0 6.1 6.2 6.3 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. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U. (online, AcuA catalog p. 153)
- ↑ 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 27 April 2016.
- ↑ 8.0 8.1 Higgins, David; Pravec, Petr; Kusnirak, Peter; Galad, Adrian; Kornos, Leos; Pray, Donald et al. (December 2006). "Asteroid lightcurve analysis at Hunters Hill Observatory and collaborating stations – autumn 2006". The Minor Planet Bulletin 33 (4): 89–91. ISSN 1052-8091. Bibcode: 2006MPBu...33...89H. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2006MPBu...33...89H. Retrieved 12 January 2016.
- ↑ 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 27 April 2016.
- ↑ 10.0 10.1 "9423 Abt (1996 AT7)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=9423.
- ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html.
External links
- Helmut Abt, photographic archive, University of Chicago
- Helmut Abt , National Optical Astronomy Observatory
- 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 (5001)-(10000) – Minor Planet Center
- 9423 Abt at AstDyS-2, Asteroids—Dynamic Site
- 9423 Abt at the JPL Small-Body Database
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