9969 Braille

9969 Braille
	Braille imaged by Deep Space 1 in 1999
Discovery
Discovered by	E. F. Helin; K. J. Lawrence
Discovery site	Palomar Obs.
Discovery date	27 May 1992
Designations
MPC designation	(9969) Braille
Pronunciation	/ˈbreɪl/
Named after	Louis Braille; (inventor of braille)
Alternative designations	1992 KD
Minor planet category	Mars-crosser
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	24.93 yr (9,107 days)
Aphelion	3.3557 AU
Perihelion	1.3263 AU
Semi-major axis	2.3410 AU
Eccentricity	0.4334
Orbital period (sidereal)	3.58 yr (1,308 days)
Mean anomaly	16.880°
Inclination	28.999°
Longitude of ascending node	241.95°
Argument of perihelion	356.11°
Earth MOID	0.3154 AU · 122.9 LD
Physical characteristics
Dimensions	1.600±0.511 km; 1.64 km (derived); 2.1 km × 1 km × 1 km
Mass	7.8×1012kg
Mean density	3.9 g cm−3
Synodic rotation period	226 h; 226.4 h
Geometric albedo	0.1289±0.2441; 0.18 (assumed)
Spectral type	SMASS = Q
Absolute magnitude (H)	15.8

9969 Braille, provisional designation 1992 KD, is an eccentric, rare-type and elongated asteroid from the innermost regions of the asteroid belt, classified as Mars-crosser and slow rotator, approximately 1–2 kilometers in diameter. It was discovered in 1992, by astronomers at Palomar Observatory and later named after Louis Braille, the inventor of the writing system for the blind. It was photographed in closeup by the spacecraft Deep Space 1 in 1999, but a malfunction resulted in indistinct images.

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[2] "Braille". Oxford English Dictionary (Online ed.). Oxford University Press. (Subscription or participating institution membership required.)

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Discovery ^[1]
Braille imaged by Deep Space 1 in 1999
Discovered by	E. F. Helin K. J. Lawrence
Discovery site	Palomar Obs.
Discovery date	27 May 1992
Designations
MPC designation	(9969) Braille
Pronunciation	/ˈbreɪl/^[2]
Named after	Louis Braille (inventor of braille)^[3]
Alternative designations	1992 KD
Minor planet category	Mars-crosser ^[1]^[4]
Orbital characteristics ^[1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc	24.93 yr (9,107 days)
Aphelion	3.3557 AU
Perihelion	1.3263 AU
Semi-major axis	2.3410 AU
Eccentricity	0.4334
Orbital period (sidereal)	3.58 yr (1,308 days)
Mean anomaly	16.880°
Inclination	28.999°
Longitude of ascending node	241.95°
Argument of perihelion	356.11°
Earth MOID	0.3154 AU · 122.9 LD
Physical characteristics
Dimensions	1.600±0.511 km^[5] 1.64 km (derived)^[6] 2.1 km × 1 km × 1 km^[1]
Mass	7.8×10¹²kg
Mean density	3.9 g cm⁻³^[7]
Synodic rotation period	226 h^[8] 226.4 h^[9]
Geometric albedo	0.1289±0.2441^[5] 0.18 (assumed)^[6]
Spectral type	SMASS = Q^[1]
Absolute magnitude (H)	15.8^[1]