| Minorplanet: | yes |
| Mpc Name: | (177) Irma |
| Background: |
|
| 177 Irma | |
| Alt Names: | A877 VA; 1900 UB; 1900 VA;1912 HE; 1937 UA, 1962 DB |
| Discoverer: | P. P. Henry, 1877 |
| Discovered: | 5 November 1877 |
| Semimajor: | 2.7685AU |
| Perihelion: | 2.111AU |
| Aphelion: | 3.426abbr=onNaNabbr=on |
| Period: | 4.61 yr (1682.5 d) |
| Inclination: | 1.3893° |
| Eccentricity: | 0.23749 |
| Rotation: | 13.856abbr=onNaNabbr=on |
| Abs Magnitude: | 9.49 |
| Epoch: | 31 July 2016 (JD 2457600.5) |
| Asc Node: | 347.55° |
| Arg Peri: | 38.184° |
| Mean Motion: | / day |
| Observation Arc: | 115.30 yr (42113 d) |
| Uncertainty: | 0 |
| Moid: | 1.11401AU |
| Jupiter Moid: | 2.03001AU |
| Tisserand: | 3.296 |
177 Irma is a fairly large and dark main belt asteroid. It was discovered by the French brothers Paul Henry and Prosper Henry on November 5, 1877. Paul was credited for this discovery. The meaning of the name Irma is unknown.
Photometric observations of this asteroid at the Organ Mesa Observatory in Las Cruces, New Mexico in 2011 gave a light curve with a period of 13.856 ± 0.001 hours and a brightness variation of 0.30 ± 0.03 in magnitude.