(6178) 1986 DA

Encyclopedia : 6 : 61 : 617 : (6178) 1986 DA

**(6178) 1986 DA**
Orbital elements
Eccentricity (orbit)>e
Inclination>i	°
Perihelion>q	~ on } Astronomical Unit>AU
Argument of perihelion>ω	°
Semi-major axis>a	AU
Longitude of the ascending node>ω	°
Aphelion>Q	~ on } Astronomical Unit>AU
Mean anomaly>M	°
Orbital period>P	years
Mean motion>n	°/day
Time of perihelion passage>TP

(6178) 1986 DA is a 2.3-kilometre-diameter M-type Mars-crosser and near-Earth asteroid, notable for being significantly more radar-reflective than other asteroids. It is an Amor asteroid, which means it approaches the orbit of Earth from the outside but does cross it.

Radar measurements suggest it is composed of nickel and iron and that it was derived from the center of a much larger object that experienced melting and differentiation. The observed radar albedo was 0.58 and the optical albedo was 0.14.[6178 (1986 DA)] (NASA abstract)

This asteroid was most likely formed from a larger body through a catastrophic collision with another object. Radar measurements of this body indicate that the surface is relatively smooth on scales of less than a meter, but it is highly irregular on scales of 10–100 meters.

The computed delta-v for a spacecraft rendezvous with this asteroid from low earth orbit is 7.1 km/s..

Asteroid 6178 reached perihelion in its orbit on March 6, 2005.

References

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