(9671) Hemera Mars-crossing Asteroid
Discovered on 5 October 1997 by L. Sarounova at Ondrejov.
The Greek goddess of bright day, daughter of goddess of night Nykta and god of darkness Erebus, Hemera, meaning ‘day’ in Greek, gives rise to the word “ephemeris”.Naming citation (20010109/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Hemera is today
Seen from above the solar system on 2026-10-14: Hemera is 2.51 au from the Sun and 2.55 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9671 |
| Provisional designation | 1997 TU9 |
| Orbit class | Mars-crossing Asteroid |
| Rotation period | 2.53 hours |
| Absolute magnitude (H) | 14.05 |
| Orbital period | 4.44 years |
| Semi-major axis | 2.70 au |
| Perihelion – aphelion | 1.54 – 3.86 au |
| Eccentricity | 0.429 |
| Inclination | 4.83° |
| Closest distance between its orbit and Earth's (MOID) | 0.543 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 5 October 1997
- (9672) Rosenbergerezek
- (9991) Anezka
- (14980) Gustavbrom
- (29464) Leonmis
- (48794) Stolzova
- (52604) Thomayer
- (58595) Joepollock
- (58600) Iwamuroonsen