Q1109232

galaxy

Key facts

Constellation: Canes Venatici
Right ascension: 12 09 29.788
Declination: +43 ° 41 ′ 07.14 ″
Distance: 52 Mly (16.0 Mpc )
Type: SA0 (r)
Apparent size v: 2.087′ × 1.252′

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Wikidata facts

Distance from Earth: 13.8
Image: NGC 4138 hst 06837 G547.png

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redshift: 0.002955
catalog code: PBC J1209.5+4342
Commons category: NGC 4138
time of discovery or invention: 1788-00-00
apparent magnitude: 10.684
right ascension: 182.3741167
declination: 43.6853167
radial velocity: 885
galaxy morphological type: S0gas

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Article

NGC 4138 is the New General Catalogue identifier for a lenticular galaxy in the northern constellation of Canes Venatici. Located around 52 million light years from Earth, it spans some 2.1 × 1.3 arc minutes and has an apparent visual magnitude of 11.3. The morphological classification of NGC 4138 is SA0(r), indicating it lacks a bar formation and has tightly wound spiral arms with a ring-like structure around the nucleus. It has no nearby companion galaxies.

This is a Seyfert 1.9 galaxy with an active galactic nucleus, having radio emissions detected in its nuclear region. Two radio sources have been detected, with the eastern component being the brighter at 1.0 mJy while the fainter source is emitting 0.75 mJy. This radiation is most likely coming from jets of energetic material being ejected by a central black hole.