(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.
 | |
| Discovery[1] | |
|---|---|
| Discovered by | Carl A. Wirtanen |
| Discovery site | Lick Obs. |
| Discovery date | 23 February 1950 |
| Designations | |
| (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 arc | 67.96 yr (24,823 d) |
| Aphelion | 2.5619 AU |
| Perihelion | 0.8350 AU |
| 1.6985 AU | |
| Eccentricity | 0.5083 |
| 2.21 yr (809 d) | |
| 315.94° | |
| 0° 26m 43.08s / day | |
| Inclination | 12.175° |
| 356.74° | |
| 224.61° | |
| Earth MOID | 0.0406 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 | |
| Dimensions | 1.39 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] | |