177 Irma

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177 Irma
Discovery
Discovered by P. P. Henry, 1877
Discovery date 5 November 1877
Designations
Main belt
Orbital characteristics[1]
Epoch 31 July 2016 (JD 2457600.5)
Uncertainty parameter 0
Observation arc 115.30 yr (42113 d)
Aphelion 3.4260 AU (512.52 Gm)
Perihelion 2.1110 AU (315.80 Gm)
2.7685 AU (414.16 Gm)
Eccentricity 0.23749
4.61 yr (1682.5 d)
42.096°
0° 12m 50.256s / day
Inclination 1.3893°
347.55°
38.184°
Earth MOID 1.11401 AU (166.654 Gm)
Jupiter MOID 2.03001 AU (303.685 Gm)
Jupiter Tisserand parameter 3.296
Physical characteristics
Mean radius
36.61±0.8 km
13.856 h (0.5773 d)[1][2]
0.0527±0.002
C
9.49

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.[3]

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.[2]

References[edit]

  1. ^ a b Yeomans, Donald K., "177 Irma", JPL Small-Body Database Browser (NASA Jet Propulsion Laboratory), retrieved 6 May 2016. 
  2. ^ a b Pilcher, Frederick (April 2012), "Rotation Period Determinations for 31 Euphrosyne, 65 Cybele, 154 Bertha 177 Irma, 200 Dynamene, 724 Hapag, 880 Herba, and 1470 Carla", The Minor Planet Bulletin 39 (2), pp. 57–60, Bibcode:2012MPBu...39...57P. 
  3. ^ Schmadel, Lutz D. (2012), Dictionary of Minor Planet Names (6th ed.), Springer, p. 29, ISBN 3642297188. 

External links[edit]