澳大利亚日出天空中的A3彗星

澳大利亚日出天空中的A3彗星

BySamuel Chan

A sunrise sky is shown over water and trees. The horizon is orange and the top of the image is deep blue. On the far right vertical bands are shown becoming progressively darker. In each band a comet appears, with the comet appearing increasingly near the top of the image on lighter bands. The main part of the image on the left is the lightest. Please see the explanation for more detailed information.
日出的天空呈现在水面和树木之上。地平线为橙色，图像顶部为深蓝色。最右边的垂直色带逐渐变暗。在每个波段中都有一颗彗星出现，在较浅的波段中，彗星越来越靠近图像顶部。左侧图像的主体部分最亮。有关更多详细信息，请参阅说明。

恩克彗星与蝌蚪云

恩克彗星与蝌蚪云

ByNASA中文

2023年10月27日 Encke and the Tadpoles Image Credit & Copyright: Dan Bartlett Explanation: History’s second known periodic comet is Comet Encke (2P/Encke). As it swings through the inner Solar System, Encke’s orbit takes it from an aphelion, its greatest distance from the Sun, inside the orbit of Jupiter to a perihelion just inside the orbit of Mercury. Returning to its perihelion every 3.3 years, Encke has the shortest period of the Solar System’s major comets. Comet Encke is also associated with (at least) two annual meteor showers on planet Earth, the North and South Taurids. Both showers are active in late October and early November. Their two separate radiants lie near bright star Aldebaran in the head-strong constellation Taurus. A faint comet, Encke was captured in…

掠过金牛座的猎户流星

掠过金牛座的猎户流星

ByNASA中文

2023年10月26日 Orionids in Taurus Image Credit & Copyright: David Cortner Explanation: History’s first known periodic comet, Comet Halley (1P/Halley), returns to the inner Solar System every 76 years or so. The famous comet made its last appearance to the naked-eye in 1986. But dusty debris from Comet Halley can be seen raining through planet Earth’s skies twice a year during two annual meteor showers, the Eta Aquarids in May and the Orionids in October. In fact, an unhurried series of exposures captured these two bright meteors, vaporizing bits of Halley dust, during the early morning hours of October 23 against a starry background along the Taurus molecular cloud. Impacting the atmosphere at about 66 kilometers per second their greenish streaks point back to the shower’s…

靓丽的西村彗星

靓丽的西村彗星

ByNASA中文

2023年9月11日 Beautiful Comet Nishimura Credit & Copyright: Petr Horálek / Institute of Physics in Opava Explanation: This scene would be beautiful even without the comet. By itself, the sunrise sky is an elegant deep blue on high, with faint white stars peeking through, while near the horizon is a pleasing tan. By itself, the foreground hills of eastern Slovakia are appealingly green, with the Zadňa hura and Veľká hora hills in the distance, and with the lights of small towns along the way. Venus, by itself on the right, appears unusually exquisite, surrounded by a colorful atmospheric corona. But what attracts the eye most is the comet. On the left, in this composite image taken just before dawn yesterday morning, is Comet Nishimura. On recent…

远去的ZTF彗星

远去的ZTF彗星

ByNASA中文

2023年3月24日 Outbound Comet ZTF Image Credit & Copyright: Rolando Ligustri Explanation: Former darling of the northern sky Comet C/2022E3 (ZTF) has faded. During its closest approach to our fair planet in early February Comet ZTF was a mere 2.3 light-minutes distant. Then known as the green comet, this visitor from the remote Oort Cloud is now nearly 13.3 light-minutes away. In this deep image, composed of exposures captured on March 21, the comet still sports a broad, whitish dust tail and greenish tinted coma though. Not far on the sky from Orion’s bright star Rigel, Comet ZTF shares the field of view with faint, dusty nebulae and distant background galaxies. The telephoto frame is crowded with Milky Way stars toward the constellation Eridanus. The influence…

ZTF遇到ATLAS彗星

ZTF遇到ATLAS彗星

ByNASA中文

2023年2月10日 ZTF meets ATLAS Image Credit & Copyright: Stefan Bemmerl Explanation: Fading as it races across planet Earth’s northern skies comet C/2022 E3 (ZTF) shares this telescopic frame with comet C/2022 U2 (ATLAS). Captured on the night of February 6 from a garden observatory in Germany’s Bavarian Forest, the starry field of view toward the constellation Auriga spans about 2.5 degrees. Discovered by sky survey projects in 2022 (the Zwicky Transient Facility and the Asteroid Terrestrial-impact Last Alert System) these long-period comets are outbound, reaching perihelion just last month. The much fainter comet ATLAS made its closest approach to our fair planet on January 29 at a distance of about 4.6 light-minutes, compared to a mere 2.4 light-minutes for comet ZTF on February 2. This…