(29075) 1950 DA

Most hazardous risk–listed near-Earth asteroid / From Wikipedia, the free encyclopedia

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(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 1.1 kilometers (0.68 miles) in diameter.[4] It once had the highest known probability of impacting Earth.[11] In 2002, it had the highest Palermo rating with a value of 0.17 for a possible collision in 2880.[12] 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.[11] As of 2022, 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).[13][14] 1950 DA is not assigned a Torino scale rating, because the 2880 date is over 100 years in the future.

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(29075) 1950 DA
Radar image of 1950 DA taken at Arecibo in March 2001, from a distance of 22 LD or 0.052 AU
Discovered byCarl A. Wirtanen
Discovery siteLick Obs.
Discovery date23 February 1950
(29075) 1950 DA
1950 DA · 2000 YK66
NEO · Apollo · PHA[1][2] · risk listed
Orbital characteristics[2]
Epoch 31 January 2012 (JD 2455957.5)
Uncertainty parameter 0
Observation arc67.96 yr (24,823 d)
Aphelion2.5619 AU
Perihelion0.8350 AU
1.6985 AU
2.21 yr (809 d)
0° 26m 43.08s / day
Earth MOID0.0406 AU (15.8169 LD)
Proper orbital elements[3]
Precession of perihelion
13.655 arcsec / yr
Precession of the ascending node
−35.824 arcsec / yr
Physical characteristics
Dimensions1.39 km × 1.46 km × 1.07 km[4]
Mean diameter
Mass>4×1012 kg[lower-alpha 1]
Mean density
>3.5 g/cm3[4]
2.12160±0.00004 h[4]