(6919) Tomonaga Main-belt Asteroid
Discovered on 16 April 1993 by Endate, K., Watanabe, K. at Kitami.
Named in memory of Shinichiro Tomonaga (1906-1979), Japanese theoretical physicist who was awarded the 1965 Nobel Prize in physics. He made great contributions to the field of quantum electrodynamics, especially in the renormalization theory to remove singularities.Naming citation (19980808/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Tomonaga is today
Seen from above the solar system on 2026-10-14: Tomonaga is 2.03 au from the Sun and 2.66 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 6919 |
| Provisional designation | 1993 HP |
| Orbit class | Main-belt Asteroid |
| Diameter | 4.09 km (#12,507 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.254 |
| Rotation period | 5.54 hours |
| Absolute magnitude (H) | 14.1 |
| Orbital period | 3.40 years |
| Semi-major axis | 2.26 au |
| Perihelion – aphelion | 2.03 – 2.50 au |
| Eccentricity | 0.104 |
| Inclination | 5.16° |
| Closest distance between its orbit and Earth's (MOID) | 1.04 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 16 April 1993
- (6104) Takao
- (6200) Hachinohe
- (6201) Ichiroshimizu
- (9067) Katsuno
- (9375) Omodaka
- (9971) Ishihara
- (10555) Tagaharue
- (13576) Gotoyoshi
- (13577) Ukawa
- (16624) Hoshizawa
- (21148) Billramsey
More named asteroids discovered by Endate, K., Watanabe, K.
- (4042) Okhotsk
- (4126) Mashu
- (4460) Bihoro
- (4491) Otaru
- (4497) Taguchi
- (4508) Takatsuki
- (4547) Massachusetts
- (4585) Ainonai
- (4607) Seilandfarm
- (4641) Ayako
- (4712) Iwaizumi
- (4773) Hayakawa
← (6918) Manaslu · (6920) Esaki →