(20502) Madeira Main-belt Asteroid
Discovered on 7 September 1999 by LINEAR at Socorro.
Gustavo Madeira (b. 1994) is a Brazilian planetary scientist at the National Observatory of Brazil. His research focuses on planetary rings, satellite formation, and the dynamic evolution of Solar System bodies. He has contributed to the NASA/DART and ESA’s Hera missions through studies of binary-asteroid system formation.Naming citation (WGSBN Bull. 6, #11, 24), IAU / Minor Planet Center, via NASA/JPL
Where Madeira is today
Seen from above the solar system on 2026-10-14: Madeira is 2.95 au from the Sun and 3.45 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 20502 |
| Provisional designation | 1999 RG11 |
| Orbit class | Main-belt Asteroid |
| Diameter | 14.4 km (#3,279 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0280 |
| Rotation period | 37.3 hours |
| Absolute magnitude (H) | 13.13 |
| Orbital period | 4.67 years |
| Semi-major axis | 2.79 au |
| Perihelion – aphelion | 2.63 – 2.95 au |
| Eccentricity | 0.0571 |
| Inclination | 15.5° |
| Closest distance between its orbit and Earth's (MOID) | 1.68 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Gustavo
All asteroids named after someone called Gustavo
Also discovered on 7 September 1999
- (12126) Chersidamas
- (12577) Samra
- (12578) Bensaur
- (12585) Katschwarz
- (12586) Juliaspeyer
- (12588) Arseneau
- (12604) Lisatate
- (12924) Madisonicole
- (13818) Ullery
- (14214) Hirsch
- (15503) Estradioto
- (16067) Brandonfan