Three views of a computer model of asteroid 1998 KY26
|Discovery site||Kitt Peak Obs.|
28 May 1998|
(discovery: first observed only)
|MPC designation||1998 KY26|
|NEO · Apollo |
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 3|
|Observation arc||11 days|
|1.37 yr (500 days)|
|0° 43m 12s / day|
|Earth MOID||0.0024 AU · 0.93 LD|
|25.0 · 25.5|
1998 KY26 is a nearly spherical sub-kilometer asteroid and fast rotator, classified as near-Earth object of the Apollo group, approximately 30 meters in diameter. It was first observed on 2 June 1998, by the Spacewatch survey at Kitt Peak National Observatory during 6 days, while it passed 800,000 kilometers (half a million miles) away from Earth (a little more than twice the Earth–Moon distance).
Orbit and classification
The asteroid orbits the Sun at a distance of 1.0–1.5 AU once every 16 months (500 days). Its orbit has an eccentricity of 0.20 and an inclination of 1° with respect to the ecliptic. It has an Earth minimum orbital intersection distance of 0.0024 AU (359,000 km), which translates into 0.93 lunar distances.
It is one of the most easily accessible objects in the Solar System, and its orbit frequently brings it on a path very similar to the optimum Earth–Mars transfer orbit. This, coupled with the fact that it is water rich, makes it an attractive target for further study and a potential source of water for future missions to Mars.
1998 KY26 is the smallest Solar System object ever studied in detail and, with a rotational period of 10.7 minutes, was the fastest-spinning object observed at the time of its discovery: most asteroids with established rotational rates have periods measured in hours. It was the first recognized minor object that spins so fast that it must be a monolithic object rather than a rubble pile, as many asteroids are thought to be. Since it was found to be a fast rotator, several other small asteroids have been found to also have short rotation periods, some even faster than 1998 KY26.
Optical and radar observations indicate that 1998 KY26 is a water-rich object.
These physical properties were measured by an international team of astronomers led by Dr. Steven J. Ostro of the Jet Propulsion Laboratory. The team used a radar telescope in California and optical telescopes in the Czech Republic, Hawaii, Arizona and California.
Unusually for a body so small, it's shape is fairly regular.
- Tholen, D. J. (September 2003). "Recovery of 1998 KY26: Implications for Detecting the Yarkovsky Effect (abstract only)". Bulletin of the American Astronomical Society. 35 (4). Retrieved 25 April 2009.
- "Spacewatch discovery of 1998 KY26". SPACEWATCH Project. 7 April 2004. Archived from the original on 1 July 2010. Retrieved 1 August 2017.
- "JPL Small-Body Database Browser: (1998 KY26)" (1998-06-08 last obs.). Jet Propulsion Laboratory. Retrieved 1 August 2017.
- "1998 KY26". Minor Planet Center. Retrieved 1 August 2017.
- "LCDB Data for (1998 KY26)". Asteroid Lightcurve Database (LCDB). Retrieved 1 August 2017.
- Ostro, Steven J.; Pravec, Petr; Benner, Lance A. M.; Hudson, R. Scott; Sarounová, Lenka; Hicks, Michael D.; et al. (June 1999). "Radar and Optical Observations of Asteroid 1998 KY26". Science. 285: 557–559(SciHomepage). Bibcode:1999Sci...285..557O. doi:10.1126/science.285.5427.557. Retrieved 1 August 2017.
- Hicks, M. D.; Weissman, P. R.; Rabinowitz, D. L.; Chamberlin, A. B.; Buratti, B. J.; Lee, C. O. (September 1998). "Close Encounters: Observations of the Earth-crossing Asteroids 1998 KY26 and 1998 ML14". American Astronomical Society. 30: 1029. Bibcode:1998DPS....30.1006H. Retrieved 1 August 2017.
- Pravec, P.; Sarounova, L. (June 1998). "1998 KY26". IAU Circ. (6941). Bibcode:1998IAUC.6941....2P. Retrieved 1 August 2017.
- "1998 KY26". Retrieved 25 April 2009.
- "Astronomy Picture of the Day: Asteroid 1998 KY26". Nasa. 2002-09-19. Retrieved 1 August 2017.
- MPEC 1998-L02
- Scott Hudson's Homepage: The Earth-Crossing Asteroid 1998 KY26
- Steven Ostro's Homepage: 1998 KY26
- Lipanović, Željko. "1998 KY26 Images". Archived from the original on 2009-10-23.
- Media Relations Office. Sun never sets, for long, on fast-spinning, water-rich asteroid (press release). Pasadena, California: Jet Propulsion Laboratory. July 22, 1999.
- 1998 KY26 at the JPL Small-Body Database