Galaxy NGC 4395

Object Description

NGC 4395
NGC 4395: Galaxy in Canes Venatici; 500 mm Cassegrain f/7.2; SBIG STL11K; 530-80-80-80 min LRGB; Bernese Highlands; © 2015 Radek Chromik

The galaxy NGC 4395 was discovered on January 2, 1786 by the German-British astronomer William Herschel with his 18.7" reflecting telescope. His son John recorded another nebula with a bright center on July 29, 1827, southwest of NGC 4395, which was named as NGC 4401. On April 13, 1850, Irish astronomer George Johnstone Stoney, using the 72" reflecting telescope owned by William Parsons, 3rd Earl of Rosse, discovered two more small nebulae, NGC 4399 and NGC 4400, which formed a trapezium with the previously discovered ones. [196, 277]

In 1920, the American astronomer Francis Gladheim Pease recognized from photographs taken by him in the years 1917 to 1919 with the 60 inch reflecting telescope on Mount Palomar that these four nebulae together with a large number of smaller nebulae formed a large, round spiral nebula. [443] At that time it was still believed that these nebulae were in our Milky Way, which represented the known universe. Some suspected that planetary systems were forming behind them. This was to change in the late 1920s with the discoveries of Edwin Hubble, which revealed the true nature of such spiral nebulae as world islands in their own right at a distance of several million light years.

NGC 4395 is a galaxy of the morphological type SAB, an intermediate form from a spiral to a barred spiral. It is a Seyfert 2 galaxy with a bright core but low surface brightness. The brightest of the active star-forming regions have their own NGC numbers. Distances range from 3.9 Mpc to 4.7 Mpc (about 12 to 15 million light years). [145]

«Revised New General Catalogue and Index Catalogue», «Historically Corrected New General Catalogue», Dr. Wolfgang Steinicke, 2021 [277]
NameRADecTypeBmagVmagDimDreyer DescriptionIdentification
NGC 4395 12 25 48.8+33 32 48Gx (SBm)10.610.213.20 × 11.0eF, vL, np of D nebUGC 7524, MCG 6-27-53, CGCG 187-42, KUG 1223+338, IRAS 12233+3348
NGC 4399 12 25 42.9+33 31 00GxyP14.01.00vF, form trapezium with 2958 and 62MCG 6-27-53, CGCG 187-42, HII in N 4395
NGC 4400 12 25 55.9+33 30 57GxyP14.50.30vF, form trapezium with 2958 and 62MCG 6-27-53, CGCG 187-42, HII in N 4395
NGC 4401 12 25 57.9+33 31 38GxyP14.00.60vF, vL, pslbM, sf of D nebMCG 6-27-53, CGCG 187-42, HII in N 4395

Finder Chart

The galaxy NGC 4395 is located in the constellation Canes Venatici. The best observation time is February to July, when it is highest at night.

Chart NGC 4395
Chart created using SkySafari 6 Pro and STScI Digitized Sky Survey. [149, 160]

References

145SIMBAD astronomical database; simbad.u-strasbg.fr/simbad
149SkySafari 6 Pro, Simulation Curriculum; skysafariastronomy.com
160The STScI Digitized Sky Survey; archive.stsci.edu/cgi-bin/dss_form
196Celestial Atlas by Curtney Seligman; cseligman.com/text/atlas.htm (2020-12-28)
277«Historische Deep-Sky Kataloge» von Dr. Wolfgang Steinicke; klima-luft.de/steinicke (2021-02-17)
443«Photographs of nebulae with the 60-inch reflector, 1917-1919» Pease, F. G; Astrophysical Journal, 51, 276-308 (1920); DOI:10.1086/142552