(46649) Tsudahiroyuki Main-belt Asteroid
Discovered on 20 September 1995 by Endate, K., Watanabe, K. at Kitami.
Hiroyuki Tsuda (b. 1960) is the director of the Ginganomori Observatory, a public observatory in Rikubetsu, Hokkaido, Japan. He shares the wonders of the universe with visitors using facilities, including a 1.15-m telescope and a planetarium. Hiroyuki also successfully photographed a low-latitude aurora in Rikubetsu in 1989.Naming citation (WGSBN Bull. 6, #15, 8), IAU / Minor Planet Center, via NASA/JPL
Where Tsudahiroyuki is today
Seen from above the solar system on 2026-10-14: Tsudahiroyuki is 2.20 au from the Sun and 1.95 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 46649 |
| Provisional designation | 1995 SN4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.63 km (#13,643 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.233 |
| Absolute magnitude (H) | 14.82 |
| Orbital period | 3.38 years |
| Semi-major axis | 2.25 au |
| Perihelion – aphelion | 1.93 – 2.57 au |
| Eccentricity | 0.143 |
| Inclination | 5.26° |
| Closest distance between its orbit and Earth's (MOID) | 0.927 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Hiroyuki
- (7186) Tomioka
- (9642) Takatahiro
- (11072) Hiraoka
- (11928) Akimotohiro
- (19392) Oyamada
- (27816) Naitohiroyuki
- (30925) Todahiroyuki
- (31402) Negishi
All asteroids named after someone called Hiroyuki
Also discovered on 20 September 1995
- (7442) Inouehideo
- (8560) Tsubaki
- (9088) Maki
- (11978) Makotomasako
- (12408) Fujioka
- (12411) Tannokayo
- (12412) Muchisachie
- (12787) Abetadashi
- (13156) Mannoucyo
- (15843) Comcom
- (16713) Airashi
- (17603) Qoyllurwasi