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Cave Nebula

NGC 3626

C9 EmissionNebula Cepheus 관측 가능 난이도 6 Professional/Research - Benefits from UHC/H-alpha filter
Credit: Hewholooks. License: CC BY-SA 3.0. (Wikimedia Commons)
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특성

등급 7.7
각크기 2.9′ × 1.9′
위치각 157°
거리 2800 ly
은하 유형 Lenticular (S0-a)
Emission Nebula [Distance: 2800 ly]

위치 & 식별자

RA 22h 57m 42.0s
Dec +62° 37' 01.2"
별자리 Cepheus
카탈로그 C9

가시성

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서베이 이미지

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Cave Nebula 소개

설명

The Cave Nebula (Sh2-155) is an emission nebula and dim HII region in Cepheus, about 2,400 light-years away. It lies at the edge of the Cepheus B molecular cloud and contains active star formation.

관측 팁

A challenging visual target requiring dark skies and at least an 8-inch telescope. An OIII or UHC nebula filter is essential. The nebula appears as a faint, irregular glow with a dark intrusion. Best observed in autumn evenings when Cepheus is near the zenith.

역사

Cataloged by Stewart Sharpless in his 1959 catalog of HII regions as Sh2-155. The name "Cave Nebula" comes from the dark lane that appears to cut into the bright emission region.

재미있는 사실

The Cave Nebula sits at the boundary between a hot ionized bubble blown by massive stars and a dense molecular cloud. This interface triggers new star formation.

커뮤니티 사진 (1)

Credit: Hewholooks. License: CC BY-SA 3.0. (Wikimedia Commons)

Credit: Hewholooks. License: CC BY-SA 3.0. (Wikimedia Commons)

Skybred Mar 2, 2026