(21602) Ialmenus Jupiter Trojan
Discovered on 17 December 1998 by Tichy, M., Moravec, Z. at Klet.
Ialmenus was one of the Achaean leaders and one of those who entered Troy in the Wooden Horse. He was the son of Ares and Astyoche. He is counted among the Argonauts and the suitors of Helen. The citation was prepared by J. Ticha.Naming citation (20010509/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Ialmenus is today
Seen from above the solar system on 2026-10-14: Ialmenus is 5.07 au from the Sun and 6.05 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21602 |
| Provisional designation | 1998 YW1 |
| Orbit class | Jupiter Trojan |
| Diameter | 16.4 km (#2,817 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.151 |
| Absolute magnitude (H) | 12.23 |
| Orbital period | 11.9 years |
| Semi-major axis | 5.22 au |
| Perihelion – aphelion | 4.90 – 5.55 au |
| Eccentricity | 0.0622 |
| Inclination | 7.93° |
| Closest distance between its orbit and Earth's (MOID) | 3.91 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 17 December 1998
- (15052) Emileschweitzer
- (15053) Bochnicek
- (27147) Mercedessosa
- (31389) Alexkaplan
- (47078) Llebaria
- (49439) Jeanlouispala
- (56067) Argerich
More named asteroids discovered by Tichy, M., Moravec, Z.
- (7495) Feynman
- (7669) Malse
- (8048) Andrle
- (8222) Gellner
- (8740) Vaclav
- (9102) Foglar
- (9224) Zelezny
- (9884) Pribram
- (10170) Petrjakes
- (10205) Pokorny
- (10213) Koukolik
- (11124) Mikulasek
← (21601) Aias · (21605) Reynoso →