(23405) Nisyros Outer Main-belt Asteroid
Discovered on 19 September 1973 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
Nisyros is the easternmost volcano of the Aegean arc of Greece. Active since antiquity, large eruptions occurred in 1422 and 1888.Naming citation (20040713/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where Nisyros is today
Seen from above the solar system on 2026-10-14: Nisyros is 3.66 au from the Sun and 4.33 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 23405 |
| Provisional designation | 1973 SB1 |
| Orbit class | Outer Main-belt Asteroid |
| Diameter | 15.0 km (#3,135 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0650 |
| Rotation period | 11.0 hours |
| Absolute magnitude (H) | 13.07 |
| Orbital period | 7.94 years |
| Semi-major axis | 3.98 au |
| Perihelion – aphelion | 3.53 – 4.43 au |
| Eccentricity | 0.112 |
| Inclination | 5.21° |
| Closest distance between its orbit and Earth's (MOID) | 2.52 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 19 September 1973
- (2643) Bernhard
- (3290) Azabu
- (3548) Eurybates
- (4007) Euryalos
- (4068) Menestheus
- (4138) Kalchas
- (4230) van den Bergh
- (4387) Tanaka
- (4757) Liselotte
- (5041) Theotes
- (5928) Pindarus
- (7152) Euneus
More named asteroids discovered by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T.
- (1743) Schmidt
- (1744) Harriet
- (1776) Kuiper
- (1777) Gehrels
- (1778) Alfven
- (1795) Woltjer
- (1808) Bellerophon
- (1809) Prometheus
- (1810) Epimetheus
- (1811) Bruwer
- (1812) Gilgamesh
- (1813) Imhotep
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