(247821) Coignet Main-belt Asteroid
Discovered on 22 September 2003 by T. Pauwels at Uccle.
Michiel Coignet (1549–1623) was mathematician and astronomer to the Archdukes Albert and Isabella. He wrote an influential book on navigation. He was the inventor of the nautical hemisphere and one of the developers of the sector. His workshop produced exquisite mathematical instruments and astrolabes.Naming citation (WGSBN Bull. 1, #8, 8), IAU / Minor Planet Center, via NASA/JPL
Where Coignet is today
Seen from above the solar system on 2026-10-14: Coignet is 3.40 au from the Sun and 2.65 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 247821 |
| Provisional designation | 2003 SN170 |
| Orbit class | Main-belt Asteroid |
| Diameter | 5.72 km (#9,357 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0540 |
| Absolute magnitude (H) | 15.43 |
| Orbital period | 5.60 years |
| Semi-major axis | 3.15 au |
| Perihelion – aphelion | 2.76 – 3.54 au |
| Eccentricity | 0.124 |
| Inclination | 11.5° |
| Closest distance between its orbit and Earth's (MOID) | 1.78 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Michiel
All asteroids named after someone called Michiel
Also discovered on 22 September 2003
- (115254) Fenyi
- (128242) Smahel
- (133432) Sarahnoble
- (172505) Kimberlyespy
- (189930) Jeanneherbert
- (253536) Tymchenko