|Discovery date||December 10, 2004|
|Minor planet category||Apollo|
|397 d 3 h|
|Dimensions||~260 meters (850 ft)
Due to the proximity of its orbit to Earth and its estimated size, this object has been classified as a "Potentially Hazardous Asteroid" (PHA) by the Minor Planet Center in Cambridge, Massachusetts. Although initially there were concerns that it might possibly impact Earth later in the 21st century and thus merit special monitoring, further analysis of its orbit has since ruled out any such collision, at least in the foreseeable future.
The size of 2004 XP14 is not precisely known. Based on optical measurements, the object is between 300 and 800 meters in diameter. Radar observations place a lower bound of about 260 meters (850 ft).
The asteroid's distance from Earth's center of mass at that moment was 0.0028906 AU (432,430 km; 268,700 mi), or just 1.1 times the Moon's average distance from Earth. It was observed immediately after this close approach by radar from three locations, from Goldstone in the Mojave Desert in the USA, from Sicily, and from Yevpatoria RT-70 radio telescope, Ukraine, as well as optically from other observatories and amateurs.
- Benner, Lance A.; Ostro; Giorgini; Busch; Rose; Jao; Jurgens (2006). "Radar Observations Of Asteroid 2004 XP14: An Outlier In The Near-earth Population". American Astronomical Society 38 (2): 621. Bibcode:2006DPS....38.6807B.
- "Absolute Magnitude (H)". NASA/JPL. Retrieved 2011-09-27.
- "JPL Close-Approach Data: (2004 XP14)". 2007-09-13 last obs (arc=2.76 years). Retrieved 2011-11-12.
- "Access : Asteroid fly-by eludes study". Nature. Retrieved 2011-09-27.
- "Date/Time Removed". NASA/JPL Near-Earth Object Program Office. Retrieved 2012-03-19.
- NASA's Asteroid Radar Group
- Orbital elements for 2004 XP14 from JPL
- Asteroid may pose danger to Earth
- Close pass by space rock
- Sormano Astronomical Observatory: Minor Body Priority List
- Minimum Orbital Intersection Distance
- Closest Approaches to the Earth by Minor Planets