(29075) 1950 DA

(29075) 1950 DA
	Radar image of 1950 DA taken at Arecibo in March 2001, from a distance of 22 LD or 0.052 AU
Discovery
Discovered by	Carl A. Wirtanen
Discovery site	Lick Obs.
Discovery date	23 February 1950
Designations
MPC designation	(29075) 1950 DA
Alternative designations	1950 DA · 2000 YK66
Minor planet category	NEO · Apollo · PHA · risk listed
Orbital characteristics
	Epoch 13 September 2023 (JD 2460200.5)
	Uncertainty parameter 0
Observation arc	73.61 yr (26,885 d)
Aphelion	2.5612 AU
Perihelion	0.8351 AU
Semi-major axis	1.6982 AU
Eccentricity	0.5082
Orbital period (sidereal)	2.213 yr (809 d)
Mean anomaly	45.28°
Mean motion	0° 26m 43.44s / day
Inclination	12.17°
Longitude of ascending node	356.65°
Argument of perihelion	224.67°
Earth MOID	0.04138 AU (16.109 LD)
Proper orbital elements
Precession of perihelion	13.655 arcsec / yr
Precession of the ascending node	−35.824 arcsec / yr
Physical characteristics
Dimensions	1.39 km × 1.46 km × 1.07 km
Mean diameter	1.3 km; 1.1 km; 1.25±0.12 km; 2.00±0.20 km;
Mass	>4×1012 kg
Mean density	>3.5 g/cm3
Synodic rotation period	2.12160±0.00004 h
Geometric albedo	0.070; 0.25;
Spectral type	S; B–V = 0.862±0.077; V–R = 0.494±0.069; V–I = 0.816±0.067;
Absolute magnitude (H)	16.83; 17.00; 17.28; 17.2; 17.1;

(29075) 1950 DA (provisional designation 1950 DA) is a risk-listed asteroid, classified as a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.3 kilometers (0.81 miles) in diameter. It once had the highest known probability of impacting Earth. In 2002, it had the highest Palermo rating with a value of 0.17 for a possible collision in 2880. Since that time, the estimated risk has been updated several times. In December 2015, the odds of an Earth impact were revised to 1 in 8,300 (0.012%) with a Palermo rating of −1.42. As of February 2024, It is listed on the Sentry Risk Table with the second highest cumulative Palermo rating of −2.05 (impact risk of 1-in-34,000). 1950 DA is not assigned a Torino scale rating, because the 2880 date is over 100 years in the future.

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