2017 CS

Discovery Five hundred-metre-wide asteroid 2017 CS passes just 1.9 million miles (3 million kilometres) or 7.9 lunar distances away from Earth on the afternoon of Monday 29 May 2017. For a few nights around this date the 13th-magnitude body is well placed for Northern Hemisphere observers as it gallops through the constellations of Canes Venatici, Bootes and Hercules at a rate of up to 14 degrees/day. Click image to be taken to an interactive Java applet. Image credit: Orbit Viewer applet originally written and kindly provided by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL) / Ade Ashford (AN). Before the waxing crescent Moon of the next lunation gets too bright, Northern Hemisphere observers get the chance to track a relatively bright and recently discovered Amor-type asteroid that passes just 0.02037 astronomical units (1.893 million miles, or 7.93 lunar distances) from Earth at 15:43 UT (4:43pm BST) on Monday 29 May 2017. Believed to be between 350 metres and 780 metres in diameter and orbiting the Sun every 4.21 years, near-Earth asteroid 2017 CS was discovered by Pan-STARRS 1 on 2 February 2017. Photometric results indicate a rotation period of about 40? hours with a lightcurve amplitude of 0.18.

天体名	2017 CS(2017)
確定符号	2017 CS
仮符号	2017 CS
軌道の種類	Apollo [NEO, PHA]
発見日	2 February 2017
発見者	Pan-STARRS 1
軌道要素と性質
元期	2017年9月4日 (JD 2458000.5)
軌道長半径 (a)	2.607657001122186 AU
近日点距離 (q)	1.0167057810438 AU
遠日点距離 (Q)	4.198608221200572 AU
離心率 (e)	0.6101075484213344
公転周期 (P)	4.21 年
軌道傾斜角 (i)	6.886812581331166 度
近日点引数 (ω)	358.8423438696792 度
昇交点黄経 (Ω)	240.3148266705509 度
平均近点角 (M)	24.41934795684354 度
衛星の数	0
物理的性質
直径	468m,between 350 metres and 780 metres
自転周期	40?.--- 時間
スペクトル分類
絶対等級 (H)	19.4