57868 Pupin, provisional designation 2001 YD, is a dark Erigonian asteroid and slow rotator from the inner regions of the asteroid belt, approximately 3.5 kilometers in diameter.
 It was discovered on 17 December 2001, by astronomers of Near-Earth Asteroid Tracking (NEAT) at the Palomar Observatory in California, United States.
 The asteroid was name after Serbian–American physicist Mihajlo Pupin.
51826 Kalpanachawla (2001 OB) is an asteroid named for Indian-born astronaut Kalpana Chawla, who died in the STS-107 (Columbia) space shuttle reentry disaster on February 1, 2003.
 51826 Kalpanachawla was discovered on July 19, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
51829 Williemccool (2001 OD ) is an asteroid named for astronaut Willie McCool, who was killed in the STS-107 ("Columbia") space shuttle reentry disaster on February 1, 2003.
 51829 Williemccool was discovered on July 21, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
51828 Ilanramon (2001 OU ) is an asteroid named for astronaut Ilan Ramon, who was killed in the STS-107 (Columbia) space shuttle reentry disaster on February 1, 2003.
 51828 Ilanramon was discovered on July 20, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
51824 Mikeanderson (2001 OE ) is an asteroid named for astronaut Mike Anderson, who was killed in the STS-107 ("Columbia") space shuttle reentry disaster on February 1, 2003.
 51824 Mikeanderson was discovered on July 19, 2001, at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
32532 Thereus, provisional designation 2001 PT, is a centaur from the outer Solar System, approximately 80 kilometers in diameter.
 It was discovered on 9 August 2001, by astronomers of the Near-Earth Asteroid Tracking program at the Palomar Observatory in California, United States.
 This minor planet was named after Thereus, a centaur from Greek mythology.
51827 Laurelclark (2001 OH ) is an asteroid named for astronaut Laurel Clark, who was killed in the STS-107 (Columbia) space shuttle reentry disaster on February 1, 2003.
 51827 Laurelclark was discovered on July 20, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
(84922) 2003 VS is a trans-Neptunian object discovered by the Near Earth Asteroid Tracking program on November 14, 2003.
 Like Pluto, it is in a 2:3 orbital resonance with Neptune, giving it the orbital properties of a plutino.
 Mike Brown's website lists it as highly likely a dwarf planet.
 However, Brown assumed that VS2 was much bigger than it really is, and the light-curve analysis has questioned whether it would truly be in the hydrostatic equilibrium.
51825 Davidbrown (2001 OQ ) is an asteroid named for astronaut David Brown, who was killed in the STS-107 (Columbia) space shuttle reentry disaster on February 1, 2003.
 51825 Davidbrown was discovered on July 19, 2001 at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program.
Michael Phillip Anderson (December 25, 1959 – February 1, 2003) was a United States Air Force officer and NASA astronaut.
 Anderson and his six fellow crew members were killed in the Space Shuttle "Columbia" disaster when the craft disintegrated during its re-entry into the Earth's atmosphere.
 Anderson served as the payload commander and lieutenant colonel in charge of science experiments on the Columbia.
 Anderson is a recipient of the Congressional Space Medal of Honor.

Question: When was the asteroid, discovered at Palomar Observatory by the JPL Near Earth Asteroid Tracking Program and named after an astronaut who was killed in the Space Shuttle "Columbia" disaster, discovered?
Answer: July 19, 2001