37655 Illapa

37655 Illapa, provisional designation 1994 PM, is a carbonaceous asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.5 kilometers in diameter. It was discovered, on 1 August 1994, by American astronomer couple Carolyn and Eugene Shoemaker at the Palomar Observatory in California, United States.[1]

Illapa
Discovery [1]
Discovered byC. S. Shoemaker
E. M. Shoemaker
Discovery sitePalomar Obs.
Discovery date1 August 1994
Designations
(37655) Illapa
Named after
Illapa (Inca mythology)[1]
1994 PM
NEO · Apollo · PHA [1]
Orbital characteristics [1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc7645 days (20.93 yr)
Aphelion2.5901 AU (387.47 Gm)
Perihelion0.36604 AU (54.759 Gm)
1.4780 AU (221.11 Gm)
Eccentricity0.75235
1.80 yr (656.34 d)
299.48°
0° 32m 54.564s / day
Inclination18.002°
139.70°
303.72°
Earth MOID0.0235523 AU (3.52337 Gm)
Physical characteristics
Mean diameter
0.792–1.772 km (est.)[2]
1.5 km (generic at 0.057)
2.6556 h[1]
C [3]
17.9[1]

    Orbit and classification

    On 16 August 2003, Illapa made a close approach to Earth of 0.025037 AU (3,750,000 km; 2,330,000 mi).[4]

    Physical characteristics

    Illapa has an estimated diameter of 0.8 to 1.8 kilometers for an assumed geometric albedo between 0.20 and 0.04.[2] For an assumed albedo of 0.057, which is typical for carbonaceous C-type asteroids, and an absolute magnitude of 17.9,[1] the asteroid has a calculated mean-diameter of 1.5 kilometers. The body has a short rotation period of 2.6556 hours.[1]

    Naming

    This minor planet was named after Illapa (Apu Illapu), the thunder or weather god from Inca mythology.[1]

    References
    1. "JPL Small-Body Database Browser: 37655 Illapa (1994 PM)". Jet Propulsion Laboratory. Retrieved 12 April 2016.
    2. "( 37655) Illapa". The Near-Earth Asteroids Data Base at E.A.R.N. Archived from the original on 31 May 2012. Retrieved 21 June 2012.
    3. "Near-Earth Asteroid Surface Roughness Depends on Compositional Class". NASA/JPL Asteroid Radar Research. 17 July 2012. Archived from the original on 16 October 2011. Retrieved 23 July 2012.
    4. "JPL Close-Approach Data: 37655 Illapa (1994 PM)". Retrieved 21 June 2012.
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