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4904 Makio, provisional designation 1989 WZ, is a stony asteroid from the inner regions of the asteroid belt, approximately 8 kilometers in diameter. It was discovered by Japanese astronomers Yoshikane Mizuno and Toshimasa Furuta at Kani Observatory (403) on 21 November 1989. It was named after Japanese astronomer Makio Akiyama.

Orbit and classification

Makio orbits the Sun in the inner main-belt at a distance of 2.1–2.7 AU once every 3 years and 8 months (1,348 days). Its orbit has an eccentricity of 0.13 and an inclination of 10° with respect to the ecliptic.

It was first identified as 1974 TB at the Chilean Cerro El Roble Station in 1974, extending the body's observation arc by 15 years prior to its discovery.

Physical characteristics

Makio has been characterized as a common S-type asteroid.

Rotation period

A rotational lightcurve of Makio was obtained from photometric observations made by Julian Oey at the Australian Kingsgrove Observatory (E19) in March 2009. Lightcurve analysis gave a rotation period of 7.830 hours with a small brightness variation of 0.08 magnitude, indicative of a spheroidal shape (U=2).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Makio measures 7.0 kilometers in diameter and its surface has an albedo of 0.33, while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.4 kilometers with an absolute magnitude of 12.5.

Naming

This minor planet was named after Japanese astronomer Makio Akiyama (born 1950), an observer and discoverer of minor planets himself at the Susono Observatory (886). The official naming citation was published by the Minor Planet Center on 5 March 1996 (M.P.C. 26763).

References

1. ^ "JPL Small-Body Database Browser: 4904 Makio (1989 WZ)" (2017-06-05 last obs.). Jet Propulsion Laboratory. Retrieved 20 June 2017.
2. ^ Schmadel, Lutz D. (2007). "(4904) Makio". Dictionary of Minor Planet Names – (4904) Makio. Springer Berlin Heidelberg. p. 423. doi:10.1007/978-3-540-29925-7_4794. ISBN 978-3-540-00238-3.
3. ^ "4904 Makio (1989 WZ)". Minor Planet Center. Retrieved 18 November 2016.
4. ^ "LCDB Data for (4904) Makio". Asteroid Lightcurve Database (LCDB). Retrieved 18 November 2016.
5. ^ 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.
6. ^ 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 5 December 2016.
7. ^ Oey, Julian (October 2010). "Light Curve Analysis of Asteroids from Leura and Kingsgrove Observatory in the First Half of 2009". The Minor Planet Bulletin. 37 (4): 135–136. Bibcode:2010MPBu...37..135O. ISSN 1052-8091. Retrieved 18 November 2016.
8. 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:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 18 November 2016.
9. "MPC/MPO/MPS Archive". Minor Planet Center. Retrieved 18 November 2016.

External links

• Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
• Dictionary of Minor Planet Names, Google books
• Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
• Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
• 4904 Makio at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 4904 Makio at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

• Minor planet object articles (numbered)
• Background asteroids
• Discoveries by Yoshikane Mizuno
• Discoveries by Toshimasa Furuta
• Named minor planets
• Astronomical objects discovered in 1989