177 Irma

177 Irma
Orbital characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Orbit type Main belt
Semimajor axis 2.770 AU
Perihelion distance 2.115 AU
Aphelion distance 3.426 AU
Orbital period 4.61 years
Inclination 1.39°
Eccentricity 0.237
Physical characteristics 1 (ftp://ftp.lowell.edu/pub/elgb/astorb.html)
Diameter 73.2 km
Rotation period 14.208 hours
Abs. magnitude 9.49
Albedo 4 (http://dorothy.as.arizona.edu/DSN/IRAS/index_iras.html) 0.053
History 2 (http://cfa-www.harvard.edu/iau/lists/NumberedMPs.html)
Discoverer P. P. Henry, 1877

177 Irma is a fairly large and dark Main belt asteroid.

It was discovered by brothers Paul Henry and Prosper Henry on November 5, 1877. Paul was credited for this discovery.


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The minor planets
Vulcanoids | Main belt | Groups and families | Near-Earth objects | Jupiter Trojans
Centaurs | Trans-Neptunians | Damocloids | Comets | Kuiper belt | Oort cloud
(For other objects and regions, see: Binary asteroids, Asteroid moons and the Solar system)
(For a complete listing, see: List of asteroids. For pronunciation, see: Pronunciation of asteroid names.)
de:Irma (Asteroid)

es:(177) Irma

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