4904 Makio
Main-belt asteroid
From Wikipedia, the free encyclopedia
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]
(Japanese astronomer)[2]
| Discovery[1] | |
|---|---|
| Discovered by | Y. Mizuno T. Furuta |
| Discovery site | Kani Obs. (403) |
| Discovery date | 21 November 1989 |
| Designations | |
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 arc | 42.65 yr (15,578 days) |
| Aphelion | 2.6986 AU |
| Perihelion | 2.0785 AU |
| 2.3886 AU | |
| Eccentricity | 0.1298 |
| 3.69 yr (1,348 days) | |
| 129.31° | |
| 0° 16m 1.2s / day | |
| Inclination | 10.122° |
| 228.94° | |
| 266.59° | |
| Physical characteristics | |
| Dimensions | 6.992±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]
