APOD250918 彗星 C/2025 R2 (SWAN)
彗星 C/2025 R2 (SWAN)
图像提供 & 版权[1]: Team Ciel Austral[2]
英文原文:Explanation: A new visitor from the outer Solar System , comet C/2025 R2 (SWAN) also known as SWAN25B was only discovered late last week, on September 11. That's just day before the comet reached perihelion, its closest approach to the Sun. First spotted by Vladimir Bezugly in images from the SWAN instrument on the sun-staring SOHO spacecraft, the comet was surprisingly bright but understandably difficult to see against the Sun's glare. Still close to the Sun on the sky, the greenish coma and tail of C/2025 R2 (SWAN) are captured in this telescopic snapshot from September 17. Spica, alpha star of the constellation Virgo, shines just beyond the upper left edge of the frame while the comet is about 6.5 light-minutes from planet Earth. Near the western horizon after sunset and slightly easier to see in binoculars from the southern hemisphere, this comet SWAN will pass near Zubenelgenubi , alpha star of Libra, on October 2. C/2025 R2 (SWAN) is scheduled to make its closest approach to our fair planet around October 20. 说明: 来自[3]太阳系外围的一颗新彗星—C/2025 R2 (SWAN)[4],又称 SWAN25B,于 2025 年 9 月 11 日才被发现,正好是在其通过近日点(距离太阳最近的位置)前一天。这颗彗星最早由弗拉基米尔贝祖格利(Vladimir Bezugly)[5]在太阳观测卫星SOHO[6]搭载的 SWAN 仪器图像中辨识出。虽然亮度出乎意料地高,但由于位置接近太阳,受到强烈日晕干扰,因此肉眼观测并不容易。 在 9 月 17 日的望远镜观测图像中,C/2025 R2 (SWAN)[7]呈现出带有绿色的彗发与彗尾[8]。图像[9]左上角边缘可见处女座的主星角宿一(Spica),而当时彗星距离地球仅约 6.5 光分。这颗彗星位于日落后西方低空位置,从南半球利用双筒望远镜较容易观察[10]。根据预测,它将在 10 月 2 日掠过天秤座的主星氐宿一(Zubenelgenubi)[11],并于 10 月 20 日前后抵达距离地球最近的位置。
明日的图片: it's complicated[12]
Authors & editors: Robert Nemiroff[13] (MTU[14]) & Jerry Bonnell[15] (UMCP[16])
NASA Official: Amber Straughn Specific rights apply[17].
NASA Web Privacy[18], Accessibility[19], Notices[20];
A service of: ASD[21] at NASA[22] / GSFC[23],
NASA Science Activation[24]
& Michigan Tech. U.[25]
太空天文实验室(成功大学物理系)
编辑:林昱丞[26]
[1]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[2]https://www.cielaustral.com/
[3]http://apod.nasa.gov/apod/ap250916.html
[4]https://earthsky.org/space/new-comet-swan25b-2025/
[5]https://en.wikipedia.org/wiki/C/2025_R2_(SWAN)#Observational_history
[6]https://science.nasa.gov/mission/soho/
[7]https://theskylive.com/c2025r2-info
[8]https://spaceplace.nasa.gov/comets/en/
[9]https://app.astrobin.com/i/i5qsgj
[10]https://cobs.si/obs_list?id=2659
[11]http://apod.nasa.gov/apod/ap040514.html
[12]http://apod.nasa.gov/apod/ap250919.html
[13]http://www.phy.mtu.edu/faculty/Nemiroff.html
[15]https://antwrp.gsfc.nasa.gov/htmltest/jbonnell/www/bonnell.html
[17]http://apod.nasa.gov/apod/lib/about_apod.html#srapply
[18]https://www.nasa.gov/about/highlights/HP_Privacy.html
[19]https://www.nasa.gov/general/accessibility/
[20]https://www.nasa.gov/privacy/
[21]https://astrophysics.gsfc.nasa.gov/
[23]https://www.nasa.gov/centers/goddard/
[24]https://science.nasa.gov/learners
[26]http://apod.nasa.gov/apod/l28091033@gs.ncku.edu.tw
http://apod.nasa.gov/apod/ap250918.html
http://sprite.phys.ncku.edu.tw/astrolab/mirrors/apod/ap250918.html