(9998) ISO Main-belt Asteroid
Discovered on 25 March 1971 by van Houten, C. J., van Houten-Groeneveld, I., Gehrels, T. at Palomar.
ISO, the Infrared Space Observatory, was launched on 1995 Nov. 17 to study the universe over a broad range of wavelengths. Among its many discoveries are water vapor on Saturn's moon Titan, infrared galaxies at immense distances, young stars in the Orion Association and the nature of the surface of major and minor planets.Naming citation (20001111/MPCPages.arc), IAU / Minor Planet Center, via NASA/JPL
Where ISO is today
Seen from above the solar system on 2026-10-14: ISO is 1.97 au from the Sun and 1.17 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 9998 |
| Provisional designation | 1293 T-1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 2.23 km (#16,716 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.388 |
| Absolute magnitude (H) | 15.24 |
| Orbital period | 3.18 years |
| Semi-major axis | 2.16 au |
| Perihelion – aphelion | 1.96 – 2.37 au |
| Eccentricity | 0.0943 |
| Inclination | 3.91° |
| Closest distance between its orbit and Earth's (MOID) | 0.959 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also discovered on 25 March 1971
- (1873) Agenor
- (5408) The
- (6072) Hooghoudt
- (6616) Plotinos
- (6617) Boethius
- (6673) Degas
- (6751) van Genderen
- (7148) Reinholdbien
- (7211) Xerxes
- (7314) Pevsner
- (7624) Gluck
- (7690) Sackler
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
← (9997) COBE · (9999) Wiles →