4904 Makio

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.[3] It was named after Japanese astronomer Makio Akiyama.[2]

4904 Makio
Discovery [1]
Discovered byY. Mizuno
T. Furuta
Discovery siteKani Obs. (403)
Discovery date21 November 1989
Designations
(4904) Makio
Named after
Makio Akiyama
(Japanese astronomer)[2]
1989 WZ · 1974 TB
1974 WC · 1980 KF2
main-belt · (inner) [3][4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc42.65 yr (15,578 days)
Aphelion2.6986 AU
Perihelion2.0785 AU
2.3886 AU
Eccentricity0.1298
3.69 yr (1,348 days)
129.31°
0° 16m 1.2s / day
Inclination10.122°
228.94°
266.59°
Physical characteristics
Dimensions6.992±0.044 km[5][6]
9.40 km (calculated)[4]
7.830±0.003 h[7]
0.20 (assumed)[4]
0.329±0.033[6]
0.3295±0.0326[5]
S [4]
12.5[1][4] · 12.6[5] · 12.70±0.57[8]

    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.[1]

    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.[3]

    Physical characteristics

    Makio has been characterized as a common S-type asteroid.[4]

    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).[7]

    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,[5][6] 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.[4]

    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).[2] The official naming citation was published by the Minor Planet Center on 5 March 1996 (M.P.C. 26763).[9]

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    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.

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