|(9969) Braille captured by the Deep Space 1 spacecraft|
|Properties of the orbit ( animation )|
|Orbit type||Main belt asteroid|
|Major semi-axis||2.3410 AU|
|Perihelion - aphelion||1.3263 AU - 3.3557 AU|
|Inclination of the orbit plane||28.9986 °|
|Length of the ascending node||242.0 °|
|Argument of the periapsis||356.1 °|
|Sidereal period||3.58 a|
|Medium diameter||2.1 × 1.0 × 1.0 km|
|Albedo||0.34 ± 0.03|
|Absolute brightness||15.9 mag|
|Spectral class||SMASSII: Q|
|Explorer||E. Helin , K. J. Lawrence|
|Date of discovery||May 27, 1992|
|Another name||1992 KD|
|Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.|
(9969) Braille is an asteroid of the main asteroid belt discovered on May 27, 1992 by Eleanor Helin and Kenneth J. Lawrence at the Palomar Observatory . It is about two kilometers long and one kilometer wide.
Braille moves between around 1.3 astronomical units ( perihelion ) to 3.4 astronomical units ( aphelion ) in an elliptical orbit around the sun. The orbit is strongly inclined towards the ecliptic at 29 ° , the orbit eccentricity is 0.43.
On July 29, 1999, the Deep Space 1 spacecraft passed the very dark asteroid just 28 km away. Due to a technical error, however, the probe's automatic camera turned away from the asteroid so that no close-up pictures were taken. Only 15 minutes after the flyby - by this time the probe had already moved 13,500 km away - could recordings be made. They show an elongated, very irregular celestial body.
The composition of the spectrographic data from Deep Space 1 largely corresponds to that of Vesta . The asteroid is thus assigned to the V-type . Presumably it is a fragment of the large asteroid Vesta, which was cut off in the past as a result of a collision with another celestial body.
- Oberst et al. (2001): A model for rotation and shape of Asteroid 9969 Braille from ground-based observations and images obtained during the Deep Space 1 (DS1) flyby ; Icarus 153, pp. 16-23
- Buratti et al. (2004): 9969 Braille: Deep Space 1 infrared spectroscopy, geometric albedo, and classification ; Icarus 167, pp. 129-135