Caldwell Catalog
109 objects in the Caldwell catalog
Caldwell Catalog
Author
Sir Patrick Moore (1923-2012)
Year
1995
天体
109
The Caldwell catalog is an astronomical catalog of 109 star clusters, nebulae, and galaxies for observation by amateur astronomers. It was compiled by Sir Patrick Alfred Caldwell-Moore (Patrick Moore) and published in 1995. The catalog complements the Messier catalog by including bright deep-sky objects visible from both hemispheres that were not included in Messier's original list.
Data Sources
- AstroPixels Caldwell Catalog - Complete reference with detailed information
- OpenNGC Database - Cross-referenced with NGC/IC designations
Objects are numbered C1 through C109. Unlike the Messier catalog, the Caldwell catalog includes objects visible from both northern and southern hemispheres.
筛选天体
| 名称 | NGC/IC | 类型 | 赤经 | 赤纬 | 星等 | 星座 | 操作 |
|---|
关于深空数据
数据来源
Deep sky object data comes from the OpenNGC database by Mattia Verga. Coordinates, magnitudes, and object classifications are sourced from authoritative astronomical catalogs including NGC, IC, Messier, and Caldwell. Source repository: OpenNGC database
测光系统
V-band (Visual): 约翰逊V滤光片，中心波长约550nm（黄绿色），与人眼峰值灵敏度匹配。这是标准天文星等系统。
B-band (Blue): 约翰逊B滤光片，中心波长约440nm（蓝光）。在V星等不可用时使用。
星等标度
天文星等尺度是对数的。每个星等步长代表约2.512倍的亮度比。星等差与亮度比的关系公式为：
\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]
其中m为星等，F为流量。星等越低=天体越亮。
色指数（B-V）
B-V色指数表示天体的颜色和温度：
\[B - V = m_B - m_V\]
Typical values: blue objects have negative B-V, white objects are near 0, yellow objects are near 0.6, and red objects are above 1.0. Reference: 颜色转换
星等表示法
每个星等值标记(V)表示V波段，或(B)表示B波段，以指示所用测光系统。
可见度指南：
• 肉眼极限：约6.0等
• 双筒望远镜：约10.0等
• 小型望远镜（10厘米）：约12.0等
• 中型望远镜（20厘米）：约14.0等
坐标系
Right Ascension (RA): Celestial longitude in hours:minutes:seconds (0h to 24h).
Declination (Dec): Celestial latitude in degrees:arcminutes:arcseconds (-90 to +90 degrees).
所有坐标均采用J2000.0历元（2000年标准参考框架）。