Discovery [1] | |
---|---|
Discovered by |
C. S. Shoemaker E. M. Shoemaker |
Discovery site | Palomar Obs. |
Discovery date | 1 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 arc | 7645 days (20.93 yr) |
Aphelion | 2.5901 AU (387.47 Gm) |
Perihelion | 0.36604 AU (54.759 Gm) |
1.4780 AU (221.11 Gm) | |
Eccentricity | 0.75235 |
1.80 yr (656.34 d) | |
299.48 ° | |
0° 32m 54.564s / day | |
Inclination | 18.002° |
139.70° | |
303.72° | |
Earth MOID | 0.0235523 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] | |
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]
On 16 August 2003, Illapa made a close approach to Earth of 0.025037 AU (3,750,000 km; 2,330,000 mi). [4]
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]
This minor planet was named after Illapa (Apu Illapu), the thunder or weather god from Inca mythology. [1]