IC Catalog
5596 objects in the IC catalog
Indeksni katalog (IC)
Author
John Louis Emil Dreyer (1852-1926)
Year
1895, 1908
Objekti
5386
The Index Catalogue (IC) is an astronomical catalogue compiled by John Louis Emil Dreyer and published in two parts in 1895 and 1908 as supplements to the New General Catalogue. The IC contains 5,386 objects that were discovered after the NGC was published, continuing the systematic cataloging of deep-sky objects.
Data Sources
- OpenNGC Database - Modern digitized version with corrections and updates
- Wikipedia - Index Catalogue - Historical background and detailed information
Objects are numbered IC 1 through IC 5386. The IC was created to supplement the NGC with newly discovered objects and corrections.
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| Ime | 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).