(6178) 1986 DA
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| Discovery A | |
|---|---|
| Discoverer | Minoru Kizawa |
| Discovery date | February 16, 1986 |
| Alternate designations B |
none |
| Category | Amor asteroid |
| Orbital elements C | |
|
|
|
| Eccentricity (e) | 0.587 |
| Semi-major axis (a) | 420.199 Gm (2.809 AU) |
| Perihelion (q) | 173.713 Gm (1.161 AU) |
| Aphelion (Q) | 666.686 Gm (4.457 AU) |
| Orbital period (P) | 1719.466 d (4.71 a) |
| Mean orbital speed | 17.77 km/s |
| Inclination (i) | 4.310° |
| Longitude of the ascending node (Ω) |
64.795° |
| Argument of perihelion (ω) |
127.171° |
| Mean anomaly (M) | 311.696° |
| Physical characteristics D | |
| Dimensions | 2.3 km 1 |
| Mass | ~2×1013 kg |
| Density | 5 g/cm³ |
| Surface gravity | ? m/s² |
| Escape velocity | ? km/s |
| Rotation period | 0.149 d 2 |
| Spectral class | M-type asteroid |
| Absolute magnitude | 15.1 |
| Albedo (geometric) | ~0.14 |
| Mean surface temperature |
~164 K |
(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 2006-06-08.
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| 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. |
