The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. [2]

The Crescent Nebula (NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula, about 5000 light years away from Earth.

眉月星云是一个 发射星云，又称Sh2-105等。 眉月星云（Crescent Nebula）也称为NGC 6888或Caldwell 27，距离大约5,000光年，是位在 天鹅座 的 发射星云。 它由来自 沃尔夫-拉叶星 HD192163（WR 136）快速的 恒星风，与它在40万年前仍是 红巨星 时吹出的慢速恒星风气体碰撞与挤压造成的。 碰撞的结果形成壳状并产生二股 震波，一股向内移动，另一股向外移动。 向内移动的震波使恒星风被加热而辐射出 X射线。 眉月星云是一个发射星云，又称Sh2-105等。

2024年9月10日 · The Crescent Nebula (also known as NGC 6888, Caldwell 27 and Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792.

2022年7月28日 · The Crescent Nebula (also known as NGC 6888, Caldwell 27, Sharpless 105) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792. [2] .

Sh 2-105は、= NGC6888で中心に見える7等星のウォルフ-ライエ星WR 136からの強烈な恒星風によってできた泡状の電離星雲です。 今回はQBPフィルターを使用したのでOIIIとHα輝線で撮影した画像となっています（正確には、フィルターの特性でHβ、SII輝線も透過しているはず）。 下段の画像はOIIIとHαが分離して見やすいように色調を変えています。 Hαの強い部分では、フィラメント状の塊状構造 (Stock & Barlow2010) が見えますが、これは恒星風の相互作用に …

SH2-105 (also known as NGC 6888 or Crescent Nebula) is an emission nebula in constellation Cygnus which ionized by the Wolf-Rayet star WR 136 which lies in a distance of about 5600 ly from earth (according to GAIA DR3).

2018年10月13日 · The Crescent nebula is an emission nebula in the constellation Cygnus. It is also known as NGC6888, Caldwell 27 and Sharpless 105. In the center is a star that turned into a red giant about 250,000 to 400,000 years ago and started to eject its outer gas shells.

NGC 6888 (also known as Caldwell 27, Sharpless 105 or The Crescent Nebula) is an emission nebula in the constellation Cygnus, about 5000 light-years away from Earth. It was discovered by William Herschel in 1792.

See this catalog overview for more information on the catalogs and the general sources used to create these descriptions and this introduction to HII regions on the general history of this area of astronomy. This image was created using the POSS-II/UKSTU data of the Digitized Sky Survey and SuperCOSMOS using the process described here.