Galaxy NGC 2403


The galaxy NGC 2403 was discovered on 1 November 1788 by William Herschel with his 18.7 inch reflecting telescope. He cataloged it as V 44 (class V = very large nebulae) and described it: «Considerably bright, round, very gradually brighter in the middle, bright nucleus 6 or 7' diameter with a faint branch extending a great way to the northern preceeding side not less than 1/2 degree, and to the north or north following the nebulosity diffused over a space not less than a whole degree.» [464] On 2 February 1886 the french astronomer Guillaume Bigourdan pointed the 12.4 inch refractor of the Paris Observatory to this nebula and found within a «very faint, very small» knot, which later became NGC 2404. [277]

NGC 2403
NGC 2403: Galaxy in Camelopardalis; 500 mm Cassegrain f/7.2; SBIG STL11K; 150-50-50-50 min LRGB; Bernese Highlands; © 2011 Radek Chromik
NGC 2403
NGC 2403: First light image; Takahashi FS 152 on a Centaurus V24 mount, ZWO ASI 183; -30°C chip temperature, R/G/B 2×2 binning: R 10×5 min, G 11×5 min, B 10×5 min; Mirasteilas Observatory, Falera; © 21. 11. 2020 Beat Kohler, Hansjörg Wälchli

Physical Properties

Distance determinations range from 3.1 Mpc to 4.2 Mpc. [145] The galaxy belongs to the M 81 galaxy group. It is home to several H-II star-forming regions, the brightest of which has its own NGC designation: NGC 2404.

Revised+Historic NGC/IC, Version 22/9, © Dr. Wolfgang Steinicke [277]
NameRADecTypebMagvMagDimDreyer DescriptionIdentification, Remarks
NGC 240307 36 50.6+65 36 06Gx (SBc)8.98.523.4 × 11.8!! cB, eL, vmE, vgmbMNUGC 3918, MCG 11-10-7, CGCG 309-40, IRAS 07321+6543, KARA 197, CGCG 310-3
NGC 240407 37 07.0+65 36 40GxyP14.50.4vF, vSHII/Association in N 2403

Finder Chart

Die Galaxie NGC 2403 befindet sich im Sternbild Camelopardalis (Giraffe). Die beste Beobachtungszeit ist September bis März, wenn es nachts am höchsten steht.

Chart Galaxy NGC 2403
Galaxy NGC 2403 in constellation Camelopardalis. Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

More Objects Nearby (±15°)


145SIMBAD astronomical database;
149SkySafari 6 Pro, Simulation Curriculum;
160The STScI Digitized Sky Survey;
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; (2021-02-17)
464«Catalogue of a second thousand of new nebulae and clusters of stars; with a few introductory remarks on the construction of the heavens» William Herschel, Philosophical Transactions of the Royal Society of London, 1 January 1789; DOI:10.1098/rstl.1789.0021