(17429) Ianhowarth Main-belt Asteroid
Discovered on 3 April 1989 by E. W. Elst at La Silla.
Ian Howarth (b. 1954) is a British astronomer who has devoted his professional life to astronomy in research, teaching, administration and outreach. He has contributed to research council committees and has played a major part in the scientific direction of the Royal Astronomical Society as Senior Secretary, and as Vice-President.Naming citation (WGSBN Bull. 3, #1, 12), IAU / Minor Planet Center, via NASA/JPL
Where Ianhowarth is today
Seen from above the solar system on 2026-10-14: Ianhowarth is 2.16 au from the Sun and 3.07 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 17429 |
| Provisional designation | 1989 GD1 |
| Orbit class | Main-belt Asteroid |
| Diameter | 1.90 km (#17,147 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.234 |
| Absolute magnitude (H) | 15.86 |
| Orbital period | 3.44 years |
| Semi-major axis | 2.28 au |
| Perihelion – aphelion | 2.04 – 2.52 au |
| Eccentricity | 0.106 |
| Inclination | 3.40° |
| Closest distance between its orbit and Earth's (MOID) | 1.03 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Ian
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- (7728) Giblin
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- (15727) Ianmorison
- (19573) Cummings
- (20386) Ianfranchi
- (21403) Haken
- (23158) Bouligny
- (26277) Ianrees
- (26468) Ianchan
- (28533) Iansohl
All asteroids named after someone called Ian
Also discovered on 3 April 1989
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- (6006) Anaximandros
- (6152) Empedocles
- (6710) Apostel
- (7014) Nietzsche
- (7933) Magritte
- (8010) Bohnhardt
- (8353) Megryan
- (9325) Stonehenge
- (9578) Klyazma
- (9579) Passchendaele
- (9749) Van den Eijnde