Astronomy:(5407) 1992 AX

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(5407) 1992 AX
Orbit of 1992 AX.gif
Orbital diagram of 1992 AX
Discovery[1]
Discovered byS. Ueda
H. Kaneda
Discovery siteKushiro Obs.
Discovery date4 January 1992
Designations
(5407) 1992 AX
1992 AX · 1987 BH2
Minor planet categoryMars crosser[1][2][3]
binary[4][5]
Orbital characteristics[2]
Epoch 27 April 2019 (JD 2458600.5)
Uncertainty parameter 0
Observation arc66.90 yr (24,434 d)
|{{{apsis}}}|helion}}2.3486 AU
|{{{apsis}}}|helion}}1.3279 AU
1.8383 AU
Eccentricity0.2776
Orbital period2.49 yr (910 d)
Mean anomaly263.87°
Mean motion0° 23m 43.8s / day
Inclination11.390°
Longitude of ascending node117.74°
108.78°
Known satellites1 (D: 780 m; P: 13.52 h)[4][5]
Earth MOID0.377 AU (147 LD)
Physical characteristics
Mean diameter2.78±0.55 km[6]
3.60±0.36 km[7]
3.8±0.4 km[8]
4.18±0.12 km[9]
Rotation period2.5488 h[10][11]
Geometric albedo0.199[8]
0.294[9]
0.376[7]
0.40[6]
SMASS = Sk[2] · S[12]
B–V = 0.690[10]
V–R = 0.500[10]
V–I = 0.840[10]
Absolute magnitude (H)13.90[7][9]
14.0[1][2]
14.47[8][10]


(5407) 1992 AX, provisional designation 1992 AX, is a stony asteroid and a synchronous binary Mars-crosser from the innermost region of the asteroid belt, approximately 3.6 kilometers (2.2 miles) in diameter. It was discovered on 4 January 1992, by Japanese astronomers Seiji Ueda and Hiroshi Kaneda at the Kushiro Observatory on Hokkaidō, Japan.[1] The S-type asteroid has a short rotation period of 2.5 hours.[4] Its sub-kilometer satellite was discovered in 1997.[5] As of 2018, the binary system has not been named.[1]

Orbit and classification

1992 AX a member of the Mars-crossing asteroids, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.66 AU.[1][3] It orbits the Sun at a distance of 1.3–2.3 AU once every 2 years and 6 months (910 days; semi-major axis of 1.84 AU). Its orbit has an eccentricity of 0.28 and an inclination of 11° with respect to the ecliptic.[2]

The asteroid makes occasional close approaches to Mars. Its next close approach, on 22 January 2027, will bring it 11,260,000 km (0.0753 AU) from Mars.[2] The body's observation arc begins with a precovery taken at Palomar Observatory in November 1951, or more than 40 years prior to its official discovery observation at Kushiro.[1]

Naming

This minor planet was numbered by the Minor Planet Center on 9 December 1992 (M.P.C. 21249).[13] As of 2018, it has not been named.[1]

Physical characteristics

1992 AX has been characterized as a common, stony S-type asteroid.[12] In the SMASS taxonomy, it is an Sk-subtype, that transitions between the S and K-type asteroids.[2] The body's color indices of 0.690 (B–V), 0.500 (V–R) and 0.840 (V–I) were also determined.[10]

Lightcurves

Rotation period

Since 1997, several rotational lightcurves of 1992 AX have been obtained from photometric observations by Petr Pravec and collaborating astronomers. Best-rated lightcurve analysis gave a rotation period of 2.5488 hours with a consolidated brightness amplitude between 0.10 and 0.12 magnitude ({{{1}}}).[4][10][11] The results supersedes a tentative period determination of 3.6 hours by Marc Buie ({{{1}}}).[4]

Satellite

During the observations in January 1997, it was also revealed that 1992 AX is a synchronous binary asteroid with a minor-planet moon in its orbit.[10] The satellite measures approximately 780 meters in diameter, or about 20% of its primary, and has an orbital period of 13.52 hours with an estimated semi-major axis of 5.8 kilometers for its very circular orbit.[5] Observations by Pravec in January and February 2012 confirmed the binary nature of this asteroid, as well as its rotational and orbital periods.[4] The satellite's provisional designation is S/1997 (5407) 1.

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite, the Spitzer Space Telescope and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), 1992 AX measures between 2.78 and 4.18 kilometers in diameter and its surface has an albedo between 0.199 and 0.40.[6][8][9]

In 2017, a study by WISE dedicated to Mars-crossing asteroids determined a diameter of 3.60 kilometers with a high albedo of 0.376.[7] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and derives a diameter of 3.79 kilometers based on an absolute magnitude of 14.47.[4] The Johnston's archive gives an effective (combined) diameter of 3.98 kilometers with 3.9 and 0.78 kilometers for is primary and secondary body, respectively.[3][5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 "5407 (1992 AX)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=5407. Retrieved 19 November 2018. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 "JPL Small-Body Database Browser: 5407 (1992 AX)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005407;cad=1. Retrieved 19 November 2018. 
  3. ↑ 3.0 3.1 3.2 "Asteroid (5407) 1992 AX". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=5407. Retrieved 19 November 2018. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 4.5 4.6 "LCDB Data for (5407)". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=5407%7C. Retrieved 19 November 2018. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 Johnston, Wm. Robert (18 February 2017). "Asteroids with Satellites Database – (450894) 2008 BT18". Johnston's Archive. http://www.johnstonsarchive.net/astro/astmoons/am-05407.html. Retrieved 19 November 2018. 
  6. ↑ 6.0 6.1 6.2 Nugent, C. R.; Mainzer, A.; Bauer, J.; Cutri, R. M.; Kramer, E. A.; Grav, T. et al. (September 2016). "NEOWISE Reactivation Mission Year Two: Asteroid Diameters and Albedos". The Astronomical Journal 152 (3): 12. doi:10.3847/0004-6256/152/3/63. Bibcode: 2016AJ....152...63N. 
  7. ↑ 7.0 7.1 7.2 7.3 Alí-Lagoa, V.; Delbo', M. (July 2017). "Sizes and albedos of Mars-crossing asteroids from WISE/NEOWISE data". Astronomy and Astrophysics 603: 8. doi:10.1051/0004-6361/201629917. Bibcode: 2017A&A...603A..55A. 
  8. ↑ 8.0 8.1 8.2 8.3 Marchis, F.; Enriquez, J. E.; Emery, J. P.; Mueller, M.; Baek, M.; Pollock, J. et al. (November 2012). "Multiple asteroid systems: Dimensions and thermal properties from Spitzer Space Telescope and ground-based observations". Icarus 221 (2): 1130–1161. doi:10.1016/j.icarus.2012.09.013. Bibcode: 2012Icar..221.1130M. 
  9. ↑ 9.0 9.1 9.2 9.3 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)
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 10.7 Pravec, Petr; Sarounová, Lenka; Rabinowitz, David L.; Hicks, Michael D.; Wolf, Marek; Krugly, Yurij N. et al. (July 2000). "Two-Period Lightcurves of 1996 FG 3, 1998 PG, and (5407) 1992 AX: One Probable and Two Possible Binary Asteroids". Icarus 146 (1): 190–203. doi:10.1006/icar.2000.6375. Bibcode: 2000Icar..146..190P. 
  11. ↑ 11.0 11.1 Pravec, P.; Scheirich, P.; Kusnirák, P.; Sarounová, L.; Mottola, S.; Hahn, G. et al. (March 2006). "Photometric survey of binary near-Earth asteroids". Icarus 181 (1): 63–93. doi:10.1016/j.icarus.2005.10.014. Bibcode: 2006Icar..181...63P. 
  12. ↑ 12.0 12.1 Sanchez, Juan A.; Michelsen, René; Reddy, Vishnu; Nathues, Andreas (July 2013). "Surface composition and taxonomic classification of a group of near-Earth and Mars-crossing asteroids". Icarus 225 (1): 131–140. doi:10.1016/j.icarus.2013.02.036. Bibcode: 2013Icar..225..131S. 
  13. ↑ "MPC/MPO/MPS Archive". Minor Planet Center. https://www.minorplanetcenter.net/iau/ECS/MPCArchive/MPCArchive_TBL.html. Retrieved 19 November 2018. 

External links



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