(6178) 1986 DA
From Wikipedia, the free encyclopedia
| Discovery | |
|---|---|
| Discovered by: | Minoru Kizawa |
| Discovery date: | February 16, 1986 |
| Alternative names: | none |
| Minor planet category: | Amor asteroid |
| Orbital characteristics | |
| Epoch July 14, 2004 (JD 2453200.5) | |
| Aphelion distance: | 666.686 Gm (4.457 AU) |
| Perihelion distance: | 173.713 Gm (1.161 AU) |
| Semi-major axis: | 420.199 Gm (2.809 AU) |
| Eccentricity: | 0.587 |
| Orbital period: | 1719.466 d (4.71 a) |
| Avg. orbital speed: | 17.77 km/s |
| Mean anomaly: | 311.696° |
| Inclination: | 4.310° |
| Longitude of ascending node: | 64.795° |
| Argument of perihelion: | 127.171° |
| Physical characteristics | |
| Dimensions: | 2.3 km 1 |
| Mass: | ~2×1013 kg |
| Mean density: | 5 g/cm³ |
| Equatorial surface gravity: | ? m/s² |
| Escape velocity: | ? km/s |
| Rotation period: | 0.149 d 2 |
| Albedo: | ~0.14 |
| Temperature: | ~164 K |
| Spectral type: | M-type asteroid |
| Absolute magnitude: | 15.1 |
(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 not 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.[1]
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.[2].
Asteroid 6178 reached perihelion in its orbit on March 6, 2005.
[edit] References
- ^ 6178 (1986 DA) (NASA abstract)
- ^ Delta-v for spacecraft rendezvous with all known near-Earth asteroids. NASA (2006-06-01). Retrieved on June 8, 2006.
| Minor planets | ||
|---|---|---|
| Previous minor planet | (6178) 1986 DA | Next minor planet |
| List of asteroids | ||
Vulcanoids · Near-Earth asteroids · Main belt · Jupiter Trojans · Centaurs · Damocloids · Comets · Trans-Neptunians (Kuiper belt • Scattered disc • Oort cloud)
For other objects and regions, see Asteroid groups and families, Binary asteroids, Asteroid moons and the Solar System.
For a complete listing, see List of asteroids. See also Pronunciation of asteroid names and Meanings of asteroid names.
