(21474) Pamelatsai Main-belt Asteroid
Discovered on 21 April 1998 by LINEAR at Socorro.
Pamela Tsai mentored a finalist in the 2005 Intel Science Talent Search, a science competition for high school seniors. She teaches at the Monta Vista High School, Cupertino, California.Naming citation (20050224/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Pamelatsai is today
Seen from above the solar system on 2026-10-14: Pamelatsai is 2.49 au from the Sun and 3.02 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21474 |
| Provisional designation | 1998 HO99 |
| Orbit class | Main-belt Asteroid |
| Absolute magnitude (H) | 15.86 |
| Orbital period | 3.67 years |
| Semi-major axis | 2.38 au |
| Perihelion – aphelion | 2.17 – 2.58 au |
| Eccentricity | 0.0853 |
| Inclination | 6.39° |
| Closest distance between its orbit and Earth's (MOID) | 1.17 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Pamela
- (14157) Pamelasobey
- (19678) Belczyk
- (22432) Pamgriffin
- (33249) Pamelasvenson
- (174515) Pamelaivezic
- (632484) Pamelagay
All asteroids named after someone called Pamela
Also discovered on 21 April 1998
- (9244) Visnjan
- (11715) Harperclark
- (11716) Amahartman
- (11718) Hayward
- (11719) Hicklen
- (11720) Horodyskyj
- (11721) Shawnlowe
- (11724) Ronaldhsu
- (11725) Victoriahsu
- (12091) Jesmalmquist
- (12092) Erinorourke
- (12093) Chrimatthews