Caldwell Catalog
109 objects in the Caldwell catalog
Caldwell Catalog
Author
Sir Patrick Moore (1923-2012)
Year
1995
Objekti
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.
Filtriraj objekte
| Ime | NGC/IC | Vrsta | RA | Dek | Sjaj | Zviježđe | Akcije |
|---|
O podacima dubokog neba
Izvor podataka
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
Fotometrijski sustavi
V-band (Visual): Johnson V filtar centriran na ~550nm (žuto-zeleno), odgovara vršnoj osjetljivosti oka. Ovo je standardni astronomski sustav magnitudа.
B-band (Blue): Johnson B filtar centriran na ~440nm (plavo svjetlo). Koristi se kada V magnituda nije dostupna.
Ljestvica sjaja
Astronomska ljestvica magnitudа je logaritamska. Svaki korak magnitude predstavlja omjer sjaja od ~2,512. Formula:
\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]
gdje je m sjaj, a F tok. Niži sjaj = svjetliji objekt.
Indeks boje (B-V)
Indeks boje B-V označava boju i temperaturu objekta:
\[B - V = m_B - m_V\]
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: Pretvorba boje
Oznaka sjaja
Svaka vrijednost magnitude označena je s (V) za V-pojas ili (B) za B-pojas kako bi se naznačio korišteni fotometrijski sustav.
Vodič vidljivosti:
• Granica golim okom: ~6,0 mag
• Dvogledi: ~10,0 mag
• Mali teleskop (4"): ~12,0 mag
• Srednji teleskop (8"): ~14,0 mag
Koordinatni sustav
Right Ascension (RA): Celestial longitude in hours:minutes:seconds (0h to 24h).
Declination (Dec): Celestial latitude in degrees:arcminutes:arcseconds (-90 to +90 degrees).
Sve koordinate su u epohi J2000.0 (standardni referentni okvir za godinu 2000).