Messier Catalog
110 objects in the Messier catalog
Messier Catalog
Author
Charles Messier (1730-1817)
Year
1774-1781
天體
110
The Messier catalog is a set of 110 astronomical objects catalogued by French astronomer Charles Messier in his 'Catalog of Nebulae and Star Clusters' first published in 1774. The catalog was motivated by Messier's interest in finding comets, and includes some of the most spectacular deep-sky objects visible from the northern hemisphere, including galaxies, nebulae, and star clusters.
Data Sources
- OpenNGC Database - Modern comprehensive astronomical database
- AstroPixels Messier Catalog - Complete reference with observations and images
Objects are numbered M1 through M110, with some numbers (like M102) being controversial. This catalog remains one of the most popular targets for amateur astronomers.
篩選天體
| 名稱 | 類型 | 赤經 | 赤緯 | 星等 | 星座 | 操作 |
|---|
關於深空數據
資料來源
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
測光系統
V-band (Visual): Johnson V 濾鏡的中心波長約為 550nm（黃綠光），對應人眼靈敏度的峰值。這是標準的天文星等系統。
B-band (Blue): Johnson B 濾鏡的中心波長約為 440nm（藍光）。在沒有 V 星等時使用。
星等尺度
天文星等尺度是對數式的。每一級星等代表約 2.512 倍的亮度比。將星等差與亮度比關聯起來的公式為：
\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]
其中 m 為星等，F 為通量。星等越低 = 天體越亮。
色指數（B-V）
B-V 色指數表示天體的顏色與溫度：
\[B - V = m_B - m_V\]
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: 色彩轉換
星等表示法
每個星等值都以 (V) 表示 V 波段或以 (B) 表示 B 波段，以指示所使用的測光系統。
可見度指南：
• 肉眼極限：約 6.0 星等
• 雙筒望遠鏡：~10.0 星等
• 小型望遠鏡（4"）：~12.0 星等
• 中型望遠鏡（8"）：~14.0 星等
坐標系
Right Ascension (RA): Celestial longitude in hours:minutes:seconds (0h to 24h).
Declination (Dec): Celestial latitude in degrees:arcminutes:arcseconds (-90 to +90 degrees).
所有座標均採用 J2000.0 曆元（2000 年的標準參考框架）。