2014 JO25

小惑星2014 JO25

2014 JO25

小惑星2014JO 25

発見日 2014年5月5日[2] 発見者マウントレモン・サーベイ

2014 JO25はアポロ群に属される小惑星である。直径は650m程度とみられている[3][4]。
2017年4月19日に地球から約180万kmの位置にまで接近する[3][4]。最接近時は、明るさが11等級になり、小型望遠鏡でも観測する事が出来る[3]。このサイズの小惑星が、次に地球に接近するのは、直径800mの1999 AN10で、2027年8月頃に最接近するとされている[2]。

分類地球近傍小惑星(NEO)[1] 潜在的に危険な小惑星(PHA)[1]
軌道の種類小惑星帯
発見
発見日 2014年5月5日
発見者マウントレモン・サーベイ
軌道要素と性質
元期:2017年2月16日 (JD2457800.5)
軌道長半径 (a) 2.067 AU
近日点距離 (q) 0.237 AU
遠日点距離 (Q) 3.897 AU
離心率 (e) 0.885
公転周期 (P) 2.97 年
軌道傾斜角 (i) 25.238 度
近日点引数 (ω) 49.542 度
昇交点黄経 (Ω) 352.251 度
平均近点角 (M) 30.656 度
物理的性質 650m 反射能0.25
自転周期時間
絶対等級 (H) 18.1

－－出典　ウィキペディア－－
https://ja.wikipedia.org/wiki/

2017年04月19日　11.0等

2017/04/19T22:36:51～22:48:06 8sec*28枚を比較明加算合成
露光時間：8秒*28=03分44秒　t-T=+0秒
Epsilon160/530mm + LPS-P2 + 60D/ISO3200 / EM200Temma
StellaImage6.5で加算合成、レベル補正とリサイズ

2017年04月28日　16.5等

2017/04/28T20:33:59～20:56:09までの30秒間露光20枚を加算合成
露光時間：30秒*20=10分　t-T=+0秒
Epsilon160/530mm + LPS-P2 + 60D/ISO3200 / EM200Temma
StellaImage6.5で加算合成、レベル補正とリサイズ

https://www.jpl.nasa.gov/news/news.php?feature=6807
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News | April 6, 2017
Asteroid to Fly Safely Past Earth on April 19
Asteroid 2014 JO25
This computer-generated image depicts the flyby of asteroid 2014 JO25. The asteroid will safely fly past Earth on April 19 at a distance of about 1.1 million miles (1.8 million kilometers), or about 4.6 times the distance between Earth and the moon. Image credit: NASA/JPL-Caltech
? Larger view

A relatively large near-Earth asteroid discovered nearly three years ago will fly safely past Earth on April 19 at a distance of about 1.1 million miles (1.8 million kilometers), or about 4.6 times the distance from Earth to the moon. Although there is no possibility for the asteroid to collide with our planet, this will be a very close approach for an asteroid of this size.

The asteroid, known as 2014 JO25, was discovered in May 2014 by astronomers at the Catalina Sky Survey near Tucson, Arizona -- a project of NASA's NEO Observations Program in collaboration with the University of Arizona. (An NEO is a near-Earth object). Contemporary measurements by NASA's NEOWISE mission indicate that the asteroid is roughly 2,000 feet (650 meters) in size, and that its surface is about twice as reflective as that of the moon. At this time very little else is known about the object's physical properties, even though its trajectory is well known.

The asteroid will approach Earth from the direction of the sun and will become visible in the night sky after April 19. It is predicted to brighten to about magnitude 11, when it could be visible in small optical telescopes for one or two nights before it fades as the distance from Earth rapidly increases.

Small asteroids pass within this distance of Earth several times each week, but this upcoming close approach is the closest by any known asteroid of this size, or larger, since asteroid Toutatis , a 3.1-mile (five-kilometer) asteroid, which approached within about four lunar distances in September 2004. The next known encounter of an asteroid of comparable size will occur in 2027 when the half-mile-wide (800-meter-wide) asteroid 1999 AN10 will fly by at one lunar distance, about 236,000 miles (380,000 kilometers).

The April 19 encounter provides an outstanding opportunity to study this asteroid, and astronomers plan to observe it with telescopes around the world to learn as much about it as possible. Radar observations are planned at NASA's Goldstone Solar System Radar in California and the National Science Foundation's Arecibo Observatory in Puerto Rico, and the resulting radar images could reveal surface details as small as a few meters.

The encounter on April 19 is the closest this asteroid has come to Earth for at least the last 400 years and will be its closest approach for at least the next 500 years.

Also on April 19, the comet PanSTARRS (C/2015 ER61) will make its closest approach to Earth, at a very safe distance of 109 million miles (175 million kilometers). A faint fuzzball in the sky when it was discovered in 2015 by the Pan-STARRS NEO survey team using a telescope on the summit of Haleakala, Hawaii, the comet has brightened considerably due to a recent outburst and is now visible in the dawn sky with binoculars or a small telescope.

JPL manages and operates NASA's Deep Space Network, including the Goldstone Solar System Radar, and hosts the Center for Near-Earth Object Studies for NASA's Near-Earth Object Observations Program, an element of the Planetary Defense Coordination Office within the agency's Science Mission Directorate.

More information about asteroids and near-Earth objects can be found at:

http://cneos.jpl.nasa.gov

http://www.jpl.nasa.gov/asteroidwatch

For more information about NASA's Planetary Defense Coordination Office, visit:

http://www.nasa.gov/planetarydefense

For asteroid and comet news and updates, follow AsteroidWatch on Twitter:

twitter.com/AsteroidWatch

News Media Contact DC Agle Jet Propulsion Laboratory, Pasadena, Calif. 818-393-9011 agle@jpl.nasa.gov

2017-100 Related Links How NASA Studies and Tracks Asteroids - NASA/JPL Education Teachable Moment

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