(23495) Nagaotoshiko Main-belt Asteroid
Discovered on 29 October 1991 by Takahashi, A., Watanabe, K. at Kitami.
Toshiko Nagao (1939–2021), an amateur astronomer, strived to promote astronomy in Japan with her own observatory on the roof on her house. She supported the second discoverer in his asteroid observations.Naming citation (WGSBN Bull. 1, #11, 6), IAU / Minor Planet Center, via NASA/JPL
Where Nagaotoshiko is today
Seen from above the solar system on 2026-10-14: Nagaotoshiko is 1.90 au from the Sun and 1.75 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 23495 |
| Provisional designation | 1991 UQ1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 7.95 km (#6,634 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0590 |
| Rotation period | 10.5 hours |
| Absolute magnitude (H) | 14.7 |
| Orbital period | 3.46 years |
| Semi-major axis | 2.29 au |
| Perihelion – aphelion | 1.88 – 2.70 au |
| Eccentricity | 0.181 |
| Inclination | 8.52° |
| Closest distance between its orbit and Earth's (MOID) | 0.890 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Toshiko
All asteroids named after someone called Toshiko
Also discovered on 29 October 1991
- (6097) Koishikawa
- (6607) Matsushima
- (9599) Onotomoko
- (12734) Haruna
- (13540) Kazukitakahashi
- (14426) Katotsuyoshi
- (20018) Paulgray