(23591) Yanagisawa Main-belt Asteroid
Discovered on 26 October 1995 by Hirasawa, M., Suzuki, S. at Nyukasa.
Yasufumi Yanagisawa (b. 1955) is a retired Japanese physics teacher at a high school who used his own astrophotographs in his physics classes to spark his students' interest in the universe. He continues to promote the enjoyment of astronomy to local residents through stargazing events held at schools and at his private observatory.Naming citation (WGSBN Bull. 6, #3, 8), IAU / Minor Planet Center, via NASA/JPL
Where Yanagisawa is today
Seen from above the solar system on 2026-10-14: Yanagisawa is 2.19 au from the Sun and 3.04 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 23591 |
| Provisional designation | 1995 UP44 |
| Orbit class | Main-belt Asteroid |
| Rotation period | 4.32 hours |
| Absolute magnitude (H) | 14.32 |
| Orbital period | 3.58 years |
| Semi-major axis | 2.34 au |
| Perihelion – aphelion | 2.04 – 2.64 au |
| Eccentricity | 0.127 |
| Inclination | 5.79° |
| Closest distance between its orbit and Earth's (MOID) | 1.03 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.