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Coordinates: Sky map 00h 48m 26s, +85° 15′ 18″
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Altered title. Add: authors 1-1. Removed parameters. Some additions/deletions were parameter name changes. | Use this bot. Report bugs. | Suggested by Abductive | Category:Caldwell objects | #UCB_Category 22/108
 
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{{Short description|Open cluster in the constellation Cepheus}}
{{Infobox cluster
{{Infobox cluster
| name = [[New General Catalogue|NGC]] 188
| name = [[New General Catalogue|NGC]] 188
| image = [[Image:NGC 188.jpg|300px]]
| image = File:C1 = NGC 188.jpg
| image_size = 280px
| caption = NGC 188
| caption = NGC 188
| credit =
| credit =
| class = Open Cluster
| class = Open Cluster
| epoch = [[J2000]]
| epoch = [[J2000]]
| ra = {{RA|00|48|26}}<ref name="simbad">{{cite simbad |title=NGC 188 |accessdate=2006-12-08}}</ref>
| ra = {{RA|00|48|26}}<ref name="simbad">{{cite simbad |title=NGC 188 |access-date=2006-12-08}}</ref>
| dec = {{DEC|+85|15.3}}<ref name="simbad" />
| dec = {{DEC|+85|15.3}}<ref name="simbad" />
| dist_ly = 5,400 ly<ref>
| dist_ly = 5,400 ly<ref>
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|last1=Bonatto |first1=C.
|last1=Bonatto |first1=C.
|last2=Bica |first2=E.
|last2=Bica |first2=E.
|last3=Santos |first3=J. F. C., Jr.
|last3=Santos |first3=J. F. C. Jr.
|year=2005
|year=2005
|title=Spatial dependence of 2MASS luminosity and mass functions in the old open cluster NGC 188
|title=Spatial dependence of 2MASS luminosity and mass functions in the old open cluster NGC 188
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|doi-access=free
|doi-access=free
}}</ref>
}}</ref>
| dist_pc = 1.66 kpc
| dist_pc = {{val|1.66|ul=kpc}}
| appmag_v = 10.0<ref>
| appmag_v = 10.0<ref>
{{cite book
{{cite book
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|publisher=[[Cambridge University Press]]
|publisher=[[Cambridge University Press]]
|bibcode=1990vads.book.....C
|bibcode=1990vads.book.....C
|isbn=0521361559
|isbn=978-0-521-36155-2
}}</ref>
}}</ref>
| size_v = 15&prime;
| size_v = {{val|15|ul='}}
| radius_ly = unknown
| radius_ly = {{val|11.8|ul=ly}}
| absmag_v = Unknown
| absmag_v = Unknown
| constellation = [[Cepheus (constellation)|Cepheus]]
| constellation = [[Cepheus (constellation)|Cepheus]]
| notes = One of the oldest known [[open cluster]]s
| notes =
| names = Cl Melotte 2,<ref name="simbad" /> [[Caldwell catalogue|Caldwell]]&nbsp;1
| names = [[Caldwell catalogue|Caldwell]] 1, [[Collinder catalogue|Cr]] 6, [[Philibert Jacques Melotte|Mel]] 2<ref name="simbad" />
|age=6.8 billion years<ref name="VandenBerg" />
}}
}}


[[File:Open cluster HR diagram ages.PNG|thumb|left|[[HR diagram]] showing the [[main sequence turnoff]] of NGC 188 and [[Messier 67|M&nbsp;67]], indicating their relatively high ages]]
''' NGC 188''' is an [[open cluster]] in the constellation [[Cepheus (constellation)|Cepheus]]. It was discovered by [[John Herschel]] in 1825.
''' NGC 188''' (also known as '''Caldwell 1''' or the '''Polarissima Cluster'''<ref name="interstellarum">{{cite book|last1=Stoyan|first1=Ronald|last2=Schurig|first2=Stephan|title=interstellarum Deep Sky Atlas|publisher=Cambridge University Press; Oculum-Verlag GmbH|publication-place=Erlangen|date=2014|isbn=978-1-107-50338-0|oclc=920437579|url=http://www.deep-sky-atlas.com/}}</ref>) is an [[open cluster]] in the constellation [[Cepheus (constellation)|Cepheus]]. It was discovered by [[John Herschel]] in 1825.
Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our [[Milky Way]] galaxy, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.<ref>
Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our [[Milky Way]] galaxy, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.<ref name="VandenBerg">
{{cite journal
{{cite journal
|last=VandenBerg |first=D. A.
|last1=VandenBerg |first1=D. A.
|last2=Stetson |first2=P. B.
|last2=Stetson |first2=P. B.
|year=2004
|year=2004
|title=On the Old Open Clusters M67 and NGC 188: Convective Core Overshooting, Color‐Temperature Relations, Distances, and Ages
|title=On the Old Open Clusters M67 and NGC 188: Convective Core Overshooting, Color-Temperature Relations, Distances, and Ages
|url=http://iopscience.iop.org/article/10.1086/426340/pdf
|journal=[[Publications of the Astronomical Society of the Pacific]]
|journal=[[Publications of the Astronomical Society of the Pacific]]
|volume=116 |issue=825 |pages=997–1011
|volume=116 |issue=825 |pages=997–1011
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|doi=10.1086/426340
|doi=10.1086/426340
|doi-access=free
|doi-access=free
}}</ref>
⚫
}}</ref> NGC 188 is very close to the [[Celestial pole|North Celestial Pole]], under five degrees away, and in the constellation of Cepheus at an estimated 5,000 [[light-year]]s' distance, this puts it slightly above the Milky Way's disc and further from the center of the galaxy than the [[Sun]].


⚫
NGC 188 is very close to the [[Celestial pole|North Celestial Pole]], under five degrees away, and in the constellation of Cepheus at an estimated 5,000 [[light-year]]s' distance, this puts it slightly above the Milky Way's disc and further from the center of the galaxy than the [[Sun]].
{{clear left}}
==References==
==References==
{{Reflist}}
{{Reflist}}


==External links==
==External links==
* {{commonscat-inline}}
* [http://messier.seds.org/xtra/ngc/n0188.html NGC 188] at SEDS NGC objects pages
* [http://messier.seds.org/xtra/ngc/n0188.html NGC 188] at SEDS NGC objects pages
* [http://www.nightskyinfo.com/archive/ngc188/ NGC 188] at NightSkyInfo.com
* [http://www.nightskyinfo.com/archive/ngc188/ NGC 188] at NightSkyInfo.com
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* {{CelestialRefEx}}
* {{CelestialRefEx}}


⚫
{{Sky|00|48|26|+|85|15|18|6677}}


⚫
{{Sky|00|48|26|+|85|15|18|6677}}
{{Catalogs|NGC=188|C=1}}
{{Catalogs|NGC=188|C=1}}
{{Caldwell catalogue}}
{{Caldwell catalogue}}
{{Ngc5}}
{{Ngc5}}
{{Cepheus (constellation)}}


{{DEFAULTSORT:NGC 0188}}
{{DEFAULTSORT:NGC 0188}}

Latest revision as of 00:03, 23 August 2024

NGC 188
NGC 188
Observation data (J2000 epoch)
Right ascension00h 48m 26s[1]
Declination+85° 15.3′[1]
Distance5,400 ly[2] (1.66 kpc)
Apparent magnitude (V)10.0[3]
Apparent dimensions (V)15′
Physical characteristics
Radius11.8 ly
Estimated age6.8 billion years[4]
One of the oldest known open clusters
Other designationsCaldwell 1, Cr 6, Mel 2[1]
Associations
ConstellationCepheus
See also: Open cluster, List of open clusters
HR diagram showing the main sequence turnoff of NGC 188 and M 67, indicating their relatively high ages

NGC 188 (also known as Caldwell 1 or the Polarissima Cluster[5]) is an open cluster in the constellation Cepheus. It was discovered by John Herschel in 1825. Unlike most open clusters that drift apart after a few million years because of the gravitational interaction of our Milky Way galaxy, NGC 188 lies far above the plane of the galaxy and is one of the most ancient of open clusters known, at approximately 6.8 billion years old.[4]

NGC 188 is very close to the North Celestial Pole, under five degrees away, and in the constellation of Cepheus at an estimated 5,000 light-years' distance, this puts it slightly above the Milky Way's disc and further from the center of the galaxy than the Sun.

References

[edit]
  1. ^ a b c "NGC 188". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2006-12-08.
  2. ^ Bonatto, C.; Bica, E.; Santos, J. F. C. Jr. (2005). "Spatial dependence of 2MASS luminosity and mass functions in the old open cluster NGC 188". Astronomy and Astrophysics. 433 (3): 917–929. arXiv:astro-ph/0502453. Bibcode:2005A&A...433..917B. doi:10.1051/0004-6361:20041113.
  3. ^ Clark, R. N. (1990). Visual Astronomy of the Deep Sky. Cambridge University Press. p. 287. Bibcode:1990vads.book.....C. ISBN 978-0-521-36155-2.
  4. ^ a b VandenBerg, D. A.; Stetson, P. B. (2004). "On the Old Open Clusters M67 and NGC 188: Convective Core Overshooting, Color-Temperature Relations, Distances, and Ages". Publications of the Astronomical Society of the Pacific. 116 (825): 997–1011. Bibcode:2004PASP..116..997V. doi:10.1086/426340.
  5. ^ Stoyan, Ronald; Schurig, Stephan (2014). interstellarum Deep Sky Atlas. Erlangen: Cambridge University Press; Oculum-Verlag GmbH. ISBN 978-1-107-50338-0. OCLC 920437579.
[edit]


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