(177) Irma Main-belt Asteroid
Discovered on 5 November 1877 by P. P. Henry at Paris.
👶 Irma as a baby name🐶 Irma as a dog name
Where Irma is today
Seen from above the solar system on 2026-10-14: Irma is 3.17 au from the Sun and 4.02 au from Earth. Computed from JPL's orbital elements.
Facts
| Number | 177 |
| Provisional designation | A877 VA |
| Orbit class | Main-belt Asteroid |
| Diameter | 69.0 km (#479 largest of 17,440 named asteroids with a measured size) |
| Albedo | 0.0220 |
| Rotation period | 13.9 hours |
| Spectral type | C: |
| Absolute magnitude (H) | 9.62 |
| Orbital period | 4.61 years |
| Semi-major axis | 2.77 au |
| Perihelion – aphelion | 2.12 – 3.42 au |
| Eccentricity | 0.235 |
| Inclination | 1.38° |
| Closest distance between its orbit and Earth's (MOID) | 1.12 au |
Data: NASA/JPL Small-Body Database and the IAU Minor Planet Center.
More named asteroids discovered by P. P. Henry
← (176) Iduna · (178) Belisana →