(21004) Theresemarjou Main-belt Asteroid
Discovered on 22 January 1988 by H. Debehogne at La Silla.
Barbe-Thérèse Marjou, born 1755, was the wife of Pierre Méchain (1744–1804), a French astronomer who undertook a geodetic survey of France with the aim to determine the length of a one-degree arc of the meridian through Paris. When he died in 1804, she continued his calculations at the Observatoire de Paris.Naming citation (WGSBN Bull. 4, #2, 6), IAU / Minor Planet Center, via NASA/JPL
Where Theresemarjou is today
Seen from above the solar system on 2026-10-14: Theresemarjou is 2.65 au from the Sun and 3.59 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 21004 |
| Provisional designation | 1988 BM4 |
| Orbit class | Main-belt Asteroid |
| Diameter | 3.56 km (#13,802 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.266 |
| Rotation period | 3.18 hours |
| Absolute magnitude (H) | 14.2 |
| Orbital period | 4.24 years |
| Semi-major axis | 2.62 au |
| Perihelion – aphelion | 2.08 – 3.15 au |
| Eccentricity | 0.205 |
| Inclination | 4.11° |
| Closest distance between its orbit and Earth's (MOID) | 1.10 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
Also named after someone called Therese
All asteroids named after someone called Therese