|Discovered by||Mount Lemmon Srvy.|
|Discovery site||Mount Lemmon Obs.|
(first observation only)
|Discovery date||5 May 2014|
|NEO · Apollo · PHA |
|Orbital characteristics |
|Epoch 23 March 2018 (JD 2458200.5)|
|Uncertainty parameter 0|
|Observation arc||6.02 yr (2,200 days)|
|2.97 yr (1,086 days)|
|0° 19m 53.04s / day|
|Earth MOID||0.0110 AU (4.3 LD)|
|Mercury MOID||0.0210 AU|
|Venus MOID||0.0412 AU|
|0.72 km (est. at 0.20)|
0.818 km (calculated)
|17.8 · 18.1|
2014 JO25 is a near-Earth asteroid. It was discovered in May 2014 by astronomers at the Catalina Sky Survey near Tucson, Arizona - a project of NASA's NEO (Near Earth Object) Observations Program in collaboration with the University of Arizona.
2014 JO25 belongs to the Apollo asteroids, which cross the orbit of Earth. Apollos are the largest group of near-Earth objects with nearly 10 thousand known members. It is also a potentially hazardous asteroid due to its sufficiently large size (an absolute magnitude brighter than 22), and its Earth-MOID (see below) of less than 0.05 AU.
It orbits the Sun at a distance of 0.25–3.90 AU once every 3 years (1,086 days; semi-major axis of 2.07 AU). Its orbit has an eccentricity of 0.89 and an inclination of 25° with respect to the ecliptic. This makes it also a Venus- and Mercury-crossing asteroid.
2014 JO25 made a close flyby of Earth on 19 April 2017, and at its closest approach on that date came within 1.8 million kilometers (1.1 million miles) of the planet. It reached an apparent magnitude of 10.76.
The 2017-flyby within a distance of 1.8 million kilometers was the closest approach to Earth by 2014 JO25 for at least the next 400 years.
Early estimation based on observed absolute magnitude and estimated albedo indicates object 600–1400 meters (m) in diameter. In 2014, further research based on NEOWISE data indicated an object of 650 m in diameter and albedo 0.25.
Based on a generic magnitude-to-mean-diameter conversion, 2014 JO25 measures approximately 720 m in diameter, using an absolute magnitude of 18.1 and assuming an albedo of 0.20, which is typical for stony asteroids. The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.20 and calculates a diameter of 818 meters based on an absolute magnitude of 17.8.
Observation of the asteroid with the Goldstone Solar System Radar were performed between April 15 and 21, 2017 by Arecibo Observatory and Goldstone Solar System Radar. Results show that the largest dimension of this contact binary is at least 870 meters.
The 2017 radiometric observations at Arecibo and Goldstone also gave a rotation period of approximately 4.5 hours. Also in April 2017, a rotational lightcurve of this asteroid was obtained from photometric observations by Brian Warner at the Palmer Divide Station (U82) in California. Lightcurve analysis gave a refined period of 4.531 hours with a brightness amplitude between 0.14 and 0.64 magnitude (U=n.a.).
Radar images of the asteroid were taken on 18 April 2017 by the Goldstone Solar System Radar:
Radar images of 2014 JO25
Telescopic view 2017-4-19 22:07:35 - 22:31:07 UTC
2014 JO25 on a graph plotting the closest flyby distance to Earth and size of NEOs in 2017.
|Wikimedia Commons has media related to 2014 JO25.|