Apophis
99942 Apophis, 2004 MN4
Apophis
Asteroid
Aries
可視
レベル 6
Professional/Research - Timing dependent
物性
等級
19.1
Type: Asteroid
Distance: 0.922 AU
Orbital Period: 323.6 days
Diameter: 0 km
On April 13, 2029, Apophis will pass within 31,600 km of Earth — closer than geostationary satellites — becoming visible to the naked eye at magnitude ~3. This is a once-in-a-millennium close approach for an asteroid of this size. Named after the Egyptian god of chaos.
位置と識別子
RA
02h 49m 56.8s
Dec
+14° 23' 09.6"
星座
Aries
カタログ
Apophis
物理的性質
直径
0 km
質量
4.0e10 kg
アルベド
0.35
(35% reflected)
自転
30.4 hours
視直径
0.0″ (current)
軌道要素
軌道長半径
0.9224 AU
(138.0 million km)
離心率
0.1912
軌道傾斜角
3.34°
公転周期
323.6 days
距離
1.521 AU
(12.7 light-min)
離角
38.3°
Moderate
観測のコツ
観測適期
April
可視性
Large telescope; naked eye during April 2029 flyby
探し方
Near-Earth asteroid (Aten group)
備考
On April 13, 2029, Apophis will pass within 31,600 km of Earth — closer than geostationary satellites — becoming visible to the naked eye at magnitude ~3. This is a once-in-a-millennium close approach for an asteroid of this size. Named after the Egyptian god of chaos.
発見
発見者
Roy Tucker, David Tholen, Fabrizio Bernardi
発見日
2004-06-19
現在の暦
1.521
AU from Earth
227.5M
km
0.0″
視直径
38°
離角
可視性
設定で観測地を設定 すると可視性データが表示されます。