|Discovery site||Lincoln Lab's ETS|
|Discovery date||19 February 2001|
|2001 DA42 · 1999 VX149|
|main-belt · (inner)|
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 0|
|Observation arc||20.30 yr (7,415 days)|
|3.75 yr (1,371 days)|
|0° 15m 45.36s / day|
25924 Douglasadams, provisional designation 2001 DA42, is a Nysian asteroid from the inner regions of the asteroid belt, approximately 2.4 kilometers in diameter. It was discovered on 19 February 2001, by astronomers of the Lincoln Near-Earth Asteroid Research at the Lincoln Laboratory's Experimental Test Site in New Mexico, United States. The asteroid was named for novelist Douglas Adams.
Douglasadams is a member of the Nysa family (405), better described as the Nysa–Polana complex, as it contains at least three asteroid families with distinct spectral types (SFC).:23 It orbits the Sun in the inner main-belt at a distance of 2.0–2.8 AU once every 3 years and 9 months (1,371 days). Its orbit has an eccentricity of 0.17 and an inclination of 2° with respect to the ecliptic.
The body's observation arc begins with a precovery taken by Spacewatch at Kitt Peak Observatory in January 1997, more than four years prior to its official discovery observation at Lincoln Lab's ETS.
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Douglasadams measures 2.410 kilometers in diameter and its surface has an albedo of 0.210. It has an absolute magnitude of 15.6.
This minor planet was named in memory of English novelist Douglas Adams (1952–2001), because its provisional designation 2001 DA42 happened to contain the year of his death, his initials, and the Answer to the Ultimate Question of Life, the Universe, and Everything (42), as given in his novel serial The Hitchhiker's Guide to the Galaxy. The official naming citation was published by the Minor Planet Center on 25 January 2005 (M.P.C. 53471).