NGC 1808 information

NGC 1808
NGC 1808
	A Hubble Space Telescope (HST) image of NGC 1808 taken using WFPC2.
Observation data (J2000 epoch)
Constellation	Columba
Right ascension	05h 07m 42.343s
Declination	−37° 30′ 46.98″
Redshift	995
Distance	41.7 ± 3.9 Mly (12.8 ± 1.2 Mpc)
Group or cluster	Dorado Group
Apparent magnitude (V)	9.94
Apparent magnitude (B)	10.83
Absolute magnitude (B)	−20.17
Characteristics
Type	(R)SAB(s)a
Apparent size (V)	7′.41 × 3′.39
Other designations
	PGC 16779

Preview warning: Page using Template:Infobox galaxy with unknown parameter "image_size"

Preview warning: Page using Template:Infobox galaxy with unknown parameter "credit"

Preview warning: Page using Template:Infobox galaxy with unknown parameter "absmag_b"

NGC 1808 is a barred spiral galaxy^[5] located in the southern constellation of Columba, about two degrees to the south and east of Gamma Caeli.^[2] It was discovered by Scottish astronomer James Dunlop, who described it as a "faint nebula".^[10] The galaxy is a member of the NGC 1808 group, which is part of the larger Dorado Group.^[10]

The morphological classification of this galaxy is (R)SAB(s)a,^[7] which indicates a spiral galaxy with a weak-bar around the nucleus (SAB), no ring around the bar (s), an outer ring (R), and tightly-wound spiral arms (a). It is inclined by an angle of 57° to the line of sight from the Earth, with the long axis oriented at a position angle of 324°.^[5] The disk of gas and stars shows a noticeable warp, and there is a pronounced asymmetry in the distribution of neutral hydrogen and H II regions.^[11]

The core region contains a suspected weak active galactic nucleus plus a circumnuclear ring containing star clusters and supernova remnants at a distance of ~280 pc from the center. These form a ring of peculiar "hot spots".^[12] It was formerly identified as a possible Seyfert galaxy,^[5] but evidence now points to starburst activity in a ~500 pc radius around the center.^[13] A probable outflow of gas is directed to the north-east from the nucleus, forming prominent dust lanes.^[5] The high level of star formation in this galaxy and the nearby NGC 1792 may indicate a recent, distant tidal interaction between the two.^[11]

The type Ia supernova SN 1993af was discovered in November 1993 at 220″ east and 94″ north of the galactic nucleus.^[14]^[15]

^ Cite error: The named reference hubb was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Sinnott1997 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Tully2016 was invoked but never defined (see the help page).
^ ^a ^b ^c ^d ^e Cite error: The named reference Busch2017 was invoked but never defined (see the help page).
^ Cite error: The named reference Armando2007 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Erwin2013 was invoked but never defined (see the help page).
^ Cite error: The named reference Paturel2003 was invoked but never defined (see the help page).
^ Cite error: The named reference ned was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference OMeara2013 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Dahlem2001 was invoked but never defined (see the help page).
^ Cite error: The named reference Salak2016 was invoked but never defined (see the help page).
^ Cite error: The named reference Salak2017 was invoked but never defined (see the help page).
^ Cite error: The named reference Hamuy1993 was invoked but never defined (see the help page).
^ Cite error: The named reference Haumy1996 was invoked but never defined (see the help page).

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

[Sinnott1997-2] Cite error: The named reference Sinnott1997 was invoked but never defined (see the help page).

[Skrutskie2006-3] Cite error: The named reference Skrutskie2006 was invoked but never defined (see the help page).

[Tully2016-4] Cite error: The named reference Tully2016 was invoked but never defined (see the help page).

[Busch2017-5] Cite error: The named reference Busch2017 was invoked but never defined (see the help page).

[Armando2007-6] Cite error: The named reference Armando2007 was invoked but never defined (see the help page).

[Erwin2013-7] Cite error: The named reference Erwin2013 was invoked but never defined (see the help page).

[Paturel2003-8] Cite error: The named reference Paturel2003 was invoked but never defined (see the help page).

[ned-9] Cite error: The named reference ned was invoked but never defined (see the help page).

[OMeara2013-10] Cite error: The named reference OMeara2013 was invoked but never defined (see the help page).

[Dahlem2001-11] Cite error: The named reference Dahlem2001 was invoked but never defined (see the help page).

[Salak2016-12] Cite error: The named reference Salak2016 was invoked but never defined (see the help page).

[Salak2017-13] Cite error: The named reference Salak2017 was invoked but never defined (see the help page).

[Hamuy1993-14] Cite error: The named reference Hamuy1993 was invoked but never defined (see the help page).

[Haumy1996-15] Cite error: The named reference Haumy1996 was invoked but never defined (see the help page).

NGC 1808 information

and 27 Related for: NGC 1808 information

NGC 1808

NGC 1792

Seyfert galaxy

NGC 7552

List of NGC objects

NGC 2298

New General Catalogue

NGC 1333

NGC 1512

Messier 85

Orion molecular cloud complex

NGC 2950

Messier 38

Orion Nebula

Beehive Cluster

NGC 2547

NGC 3201

Messier 87

NGC 1537

NGC 1947

NGC 1569

Hubble sequence

Messier 43

Messier 79

NGC 3175

Messier 36

Crab Nebula