The northernmost open cluster - NGC 188 (Massimo Di Fusco)

The northernmost open cluster - NGC 188

NGC 188 (also known as Caldwell 1) is an open cluster in the constellation Cepheus about 5000 light-years away. It was discovered by John Herschel in 1831, who cataloged it with the number 34 (h 34). It is the northernmost open cluster there is: it is located less than 5 degrees from Polaris and is therefore circumpolar in almost the entire northern hemisphere.
It is a very concentrated cluster, although its age has been estimated at 5 billion years, i.e., one billion less than the M67 cluster in Cancer and two less than NGC 6791 in Lyra, the oldest known cluster in the Milky Way. This contrasts with the characteristics of almost all known open clusters, generally made up of young, hot stars, which are still gravitationally bound to each other; in fact the main sequence stars of NGC 188 are old and relatively cold stars, of spectral class F2, i.e., yellow stars. The age of its components is therefore comparable to that of our Sun.
The cluster is located, unlike most open clusters, about 1800 light years from the galactic plane, therefore in a rather high position; this is in fact a common characteristic among older open clusters.

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Status	Advanced success
Started	...
Astrometry.net job	9947806
PixInsight job	STZ6KQHHZ10CNKPZBZLEC2H6EFYEL2PC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h47m12s.645
RA (top/left)	01h04m05s.570
RA (top/right)	00h22m23s.618
RA (bottom/right)	00h33m02s.543
RA (bottom/left)	01h10m15s.882

Dec (center)	+85°14′47″.30
Dec (top/left)	+85°39′12″.34
Dec (top/right)	+85°23′39″.53
Dec (bottom/right)	+84°49′05″.16
Dec (bottom/left)	+85°02′48″.95

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