Caldwell Catalog
109 objects in the Caldwell catalog
Caldwell Catalog
Author
Sir Patrick Moore (1923-2012)
Year
1995
Objekter
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.
Filtrér objekter
| Navn | NGC/IC | Type | RA | Dek | Mag | Stjernebillede | Handlinger |
|---|
Om deep sky-data
Datakilde
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
Fotometriske systemer
V-band (Visual): Johnson V-filter centreret omkring ~550 nm (gulgrønt), svarende til det menneskelige øjes højeste følsomhed. Dette er det standardiserede astronomiske magnitudesystem.
B-band (Blue): Johnson B-filter centreret omkring ~440 nm (blåt lys). Bruges når V-magnitud ikke er tilgængelig.
Magnitudeskala
Den astronomiske magnitudskala er logaritmisk. Hvert magnitudetrin svarer til et lysstyrkeforhold på ca. 2,512x. Formlen, der relaterer magnitudeforskel til lysstyrkeforhold, er:
\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]
hvor m er magnitude og F er flux. Lavere magnitude = lysere objekt.
Farveindeks (B-V)
B-V-farveindekset angiver objektets farve og temperatur:
\[B - V = m_B - m_V\]
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: Farvekonvertering
Magnitudenotation
Hver magnitudværdi er markeret med (V) for V-bånd eller (B) for B-bånd for at angive det anvendte fotometriske system.
Synlighedsguide:
• Grænse for det blotte øje: ~6.0 mag
• Kikkert: ~10.0 mag
• Lille teleskop (4"): ~12.0 mag
• Mellemstort teleskop (8"): ~14.0 mag
Koordinatsystem
Right Ascension (RA): Celestial longitude in hours:minutes:seconds (0h to 24h).
Declination (Dec): Celestial latitude in degrees:arcminutes:arcseconds (-90 to +90 degrees).
Alle koordinater er i J2000.0-epoken (standardreferenceramme for år 2000).