NGC 23

NGC 23
NGC 23
	NGC 23 by HST
Observation data (J 2000.0 epoch)
Constellation	Pegasus
Right ascension	00h 09m 53.411s
Declination	+25° 55′ 25.46″
Redshift	0.015231
Heliocentric radial velocity	4,568 km/s
Distance	173.5 Mly (53.21 Mpc)
Apparent magnitude (V)	11.9 mag
Absolute magnitude (V)	-21.85
Characteristics
Type	SBb
Apparent size (V)	1.9′ × 1.4′
Other designations
	LEDA 698, UGC 89, Mrk 545, PGC 698, GC 9.

NGC 23 is a spiral galaxy located in the northern constellation of Pegasus, around 173.5 megalight-years distant from the Milky Way.^[3] It was discovered by William Herschel on 10 September 1784. In the Webb Society Deep-Sky Observer's Handbook,^[6] the visual appearance of NGC 23 is described as follows:

Bright, extended ellipse; a bright nuclear structure is noticeably elongated; two weak spiral enhancements emerge from opposite sides of the nucleus, one curving towards a bright star attached on the south end. The galaxy is likely interacting with NGC 9.

The shape of this galaxy is described by its morphological classification of SBb, which indicates it is a barred spiral (SB) with spiral arms that are moderately tightly wound (b).^[4] It is a luminous infrared galaxy with star-forming clumps.^[7]

^ ^a ^b Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference ned was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference tully2016 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference GarcíaLorenzo2015 was invoked but never defined (see the help page).
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^ Cite error: The named reference Webb was invoked but never defined (see the help page).
^ Cite error: The named reference Larson2020 was invoked but never defined (see the help page).

[Skrutskie2006-1] Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).

[ned-2] Cite error: The named reference ned was invoked but never defined (see the help page).

[tully2016-3] Cite error: The named reference tully2016 was invoked but never defined (see the help page).

[GarcíaLorenzo2015-4] Cite error: The named reference GarcíaLorenzo2015 was invoked but never defined (see the help page).

[SIMBAD-5] Cite error: The named reference SIMBAD was invoked but never defined (see the help page).

[Webb-6] Cite error: The named reference Webb was invoked but never defined (see the help page).

[Larson2020-7] Cite error: The named reference Larson2020 was invoked but never defined (see the help page).

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NGC 23

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