3915 Fukushima
| Discovery | |
|---|---|
| Discovered by |
M. Yanai K. Watanabe |
| Discovery site | Kitami Obs. |
| Discovery date | 15 August 1988 |
| Designations | |
| MPC designation | 3915 Fukushima |
|
Named after
|
Hisao Fukushima (amateur astronomer) |
|
1988 PA1 · 1926 GQ 1935 UL · 1935 UX 1950 QT · 1975 EX5 1977 TV7 · 1977 TW3 1979 FH1 · 1983 EM |
|
| main-belt · (inner) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 65.55 yr (23,942 days) |
| Aphelion | 2.5392 AU |
| Perihelion | 2.3377 AU |
| 2.4384 AU | |
| Eccentricity | 0.0413 |
| 3.81 yr (1,391 days) | |
| 186.61° | |
| 0° 15m 31.68s / day | |
| Inclination | 14.433° |
| 173.51° | |
| 143.75° | |
| Physical characteristics | |
| Dimensions |
20.38±1.6 km (IRAS:9) 21.993±0.052 22.354±0.031 km 22.82±0.38 km |
|
8.40±0.01 h 9.41±0.01 h 9.4177±0.0004 h 9.418±0.001 h |
|
|
0.0441±0.0015 0.046±0.002 0.051±0.002 0.0561±0.010 (IRAS:9) |
|
| P · C | |
| 12.2 · 12.3 | |
3915 Fukushima, provisional designation 1988 PA1, is a carbonaceous asteroid from the inner regions of the asteroid belt, approximately 21 kilometers in diameter. It was discovered on 15 August 1988, by Japanese astronomers Masayuki Yanai and Kazuro Watanabe at the Kitami Observatory in eastern Hokkaido, Japan.
The C-type asteroid is also classified as a reddish P-type by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer. It orbits the Sun at a distance of 2.3–2.5 AU once every 3 years and 10 months (1,391 days). Its orbit has an eccentricity of 0.04 and an inclination of 14° with respect to the ecliptic.Fukushima was first identified as "1926 GQ" at Heidelberg Observatory in 1926, extending its observation arc by 62 years prior to its discovery.
Several high-quality rotational light-curves were obtained from photometric observations since 2003. An observation by Brian Warner at the U.S. Palmer Divide Observatory in Colorado rendered a rotation period of 9.418±0.001 hours with a high brightness variation of 0.67 in magnitude (U=3), indicating that the body has a non-spherical shape. This observation concurs with another measurement taken at the Oakley Observatory that rendered a period of 9.41±0.01 and an amplitude of 0.50 mag (U=3), superseding a less accurate light-curve produced by the PDS of 8.40 hours (U=2). In 2011, an observation by René Roy gave another concurring period of 9.4177±0.0004 hours and an amplitude of 0.79 mag (U=3). On 16 December 2012, the asteroid occulted the star HIP 4315 over parts of Europe and North America. At the time the body's brightness was 16.3 in magnitude (mag) and that of the star was 8.5 mag.
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