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| names = ] 4, ] 04-01-21, ] 930 | names = ] 4, ] 04-01-21, ] 930
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'''NGC 45''' is a ] ]<ref>http://simbak.cfa.harvard.edu/simbad/sim-id?Ident=ngc+45</ref> in the constellation of ]. It was discovered on 11 November 1835 by the English astronomer ]. In the sky, it is located near the magnitude 6.8 star HD 941. '''NGC 45''' is a ] ]<ref>http://simbak.cfa.harvard.edu/simbad/sim-id?Ident=ngc+45</ref> in the constellation of ]. In the Catalogue of Named Galaxies, it is called '''Tenebrosus Ceti''', or the ''dark'' galaxy.<ref>{{cite web|last1=Bodifee|first1=Gerard|title=Catalogue of One Thousand Named Galaxies|url=http://www.bodifee.be/wp-content/uploads/2015/08/2_CMG.pdf|accessdate=21 May 2017}}</ref> It was discovered on 11 November 1835 by the English astronomer ]. In the sky, it is located near the magnitude 6.8 star HD 941.


NGC 45 has no clear defined spiral arms like the ] galaxy. Unlike the Milky Way, the ] is also very small and distorted. NGC 45 thus does not have a ] like the Milky Way.<ref></ref><ref name=gowanlock-2011>{{Cite journal | last1 = Gowanlock | first1 = M. G. | last2 = Patton | first2 = D. R. | last3 = McConnell | first3 = S. M. | doi = 10.1089/ast.2010.0555 | title = A Model of Habitability Within the Milky Way Galaxy | journal = Astrobiology | volume = 11 | issue = 9 | pages = 855–873 | year = 2011 | pmid = 22059554| pmc = |arxiv = 1107.1286 |bibcode = 2011AsBio..11..855G }}</ref> <ref name="SP-20150821">{{cite web |last=Choi |first=Charles Q. |title=Giant Galaxies May Be Better Cradles for Habitable Planets |url=http://www.space.com/30335-giant-galaxies-habitable-planets.html |date=21 August 2015 |work=] |accessdate=24 August 2015 }}</ref> For the Milky Way, the galactic habitable zone is commonly believed to be an ] with an outer radius of about 10 ]s and an inner radius close to the ], both of which lack hard boundaries.<ref name=gowanlock-2011 /> NGC 45 has no clear defined spiral arms like the ] galaxy. Unlike the Milky Way, the ] is also very small and distorted. NGC 45 thus does not have a ] like the Milky Way.<ref></ref><ref name=gowanlock-2011>{{Cite journal | last1 = Gowanlock | first1 = M. G. | last2 = Patton | first2 = D. R. | last3 = McConnell | first3 = S. M. | doi = 10.1089/ast.2010.0555 | title = A Model of Habitability Within the Milky Way Galaxy | journal = Astrobiology | volume = 11 | issue = 9 | pages = 855–873 | year = 2011 | pmid = 22059554| pmc = |arxiv = 1107.1286 |bibcode = 2011AsBio..11..855G }}</ref> <ref name="SP-20150821">{{cite web |last=Choi |first=Charles Q. |title=Giant Galaxies May Be Better Cradles for Habitable Planets |url=http://www.space.com/30335-giant-galaxies-habitable-planets.html |date=21 August 2015 |work=] |accessdate=24 August 2015 }}</ref> For the Milky Way, the galactic habitable zone is commonly believed to be an ] with an outer radius of about 10 ]s and an inner radius close to the ], both of which lack hard boundaries.<ref name=gowanlock-2011 />

==Gallery==
<gallery>
File:NGC45--hst-606-r814g555b435.jpg|Combined ] images
File:NGC 0045 2MASS.jpg|] (near-])
</gallery>


==References== ==References==

Revision as of 00:10, 29 July 2017

NGC 45
NGC 45NGC 45 by GALEX (ultraviolet)
Observation data (2000.0 epoch)
ConstellationCetus
Right ascension00 14 3.99
Declination−23° 10′ 55.5″
Redshift0.001558
Heliocentric radial velocity467 km/s
Distance32.6 ± 10 Mly
(10 ± 3.1 Mpc)
Apparent magnitude (V)10.4
Characteristics
TypeSA(s)dm
Apparent size (V)7.41′ × 5.13'
Other designations
UGC 4, MCG 04-01-21, PGC 930

NGC 45 is a low surface brightness spiral galaxy in the constellation of Cetus. In the Catalogue of Named Galaxies, it is called Tenebrosus Ceti, or the dark galaxy. It was discovered on 11 November 1835 by the English astronomer John Herschel. In the sky, it is located near the magnitude 6.8 star HD 941.

NGC 45 has no clear defined spiral arms like the Milky Way galaxy. Unlike the Milky Way, the center bar nucleus is also very small and distorted. NGC 45 thus does not have a galactic habitable zone like the Milky Way. For the Milky Way, the galactic habitable zone is commonly believed to be an annulus with an outer radius of about 10 kiloparsecs and an inner radius close to the Galactic Center, both of which lack hard boundaries.

Gallery

References

  1. ^ NASA NED, "NGC 0045" (accessed 20 April 2010)
  2. "Distance Results for NGC 0045". NASA/IPAC Extragalactic Database. Retrieved 4 May 2010.
  3. http://simbak.cfa.harvard.edu/simbad/sim-id?Ident=ngc+45
  4. Bodifee, Gerard. "Catalogue of One Thousand Named Galaxies" (PDF). Retrieved 21 May 2017.
  5. Caltech, II. MORPHOLOGY, #34
  6. ^ Gowanlock, M. G.; Patton, D. R.; McConnell, S. M. (2011). "A Model of Habitability Within the Milky Way Galaxy". Astrobiology. 11 (9): 855–873. arXiv:1107.1286. Bibcode:2011AsBio..11..855G. doi:10.1089/ast.2010.0555. PMID 22059554.
  7. Choi, Charles Q. (21 August 2015). "Giant Galaxies May Be Better Cradles for Habitable Planets". Space.com. Retrieved 24 August 2015.

External links

Astronomical catalogs
NGC
PGC
UGC


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