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 | Mag | Ozvezdje | Dejanja |
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O podatkih globokega neba
Vir podatkov
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
Fotometrični sistemi
V-band (Visual): Johnson V filter s središčem pri ~550nm (rumeno-zelena), ki ustreza vrhunski občutljivosti očesa. To je standardni astronomski sistem magnitud.
B-band (Blue): Johnson B filter s središčem pri ~440nm (modra svetloba). Uporablja se, ko magnitude V ni na voljo.
Lestvica magnitud
Astronomska lestvica magnitud je logaritmična. Vsak korak magnitude predstavlja razmerje svetlosti ~2,512. Formula:
\[m_1 - m_2 = -2.5 \times \log_{10}\left(\frac{F_1}{F_2}\right)\]
kjer je m magnituda in F tok. Nižja magnituda = svetlejši objekt.
Barvni indeks (B-V)
Barvni indeks B-V označuje barvo in temperaturo 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 barv
Oznaka magnitude
Vsaka vrednost magnitude je označena z (V) za V-pas ali (B) za B-pas za označevanje uporabljenega fotometričnega sistema.
Vodnik vidljivosti:
• Meja prostega očesa: ~6,0 mag
• Daljnogled: ~10,0 mag
• Mali teleskop (4"): ~12,0 mag
• Srednji teleskop (8"): ~14,0 mag
Koordinatni sistem
Right Ascension (RA): Celestial longitude in hours:minutes:seconds (0h to 24h).
Declination (Dec): Celestial latitude in degrees:arcminutes:arcseconds (-90 to +90 degrees).
Vse koordinate so v epohi J2000.0 (standardni referenčni okvir za leto 2000).