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.
Filtriraj objekte
| Ime | 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).