NGC 129 open star cluster (Richard H)

Celestial hemisphere: Northern · Constellation: Cassiopeia (Cas) · Contains: HD1917 · HD1950 · HD2291 · HD236416 · HD236417 · HD236419 · HD236427 · HD236429 · HD236433 · HD236436 · HD236439 · HD236469 · HD236479 · HD236480 · HD2506 · HD2626 · HD3191 · HD3283 · HD3409 · HD3489 · LDN 1286 · NGC 103 · NGC 129 · NGC 136

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NGC 129 open star cluster

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NGC 129 open star cluster

NGC 129 is an open cluster in the constellation Cassiopeia. It was discovered by William Herschel in 1788. It is located almost exactly halfway between the bright stars Caph (β Cassiopeia) and γ Cassiopeia. It is large but not dense and can be observed by binoculars, through which the most obvious component is a small triangle of stars of magnitude 8 and 9, located in the center of the cluster.

NGC 129 contains several giant stars. The brightest member of the cluster is DL Cassiopeia, a binary system which contains a Cepheid variable with a 8,00 day period. Using the fluctuations of the brightness of DL Cassiopeia from 8,7 to 9,28, Gieren et al. in 1994 determined the distance of NGC 129 to be 2034 ±110 pc (6.630 ±360 ly), much larger than the distance obtained by Turner et al. (1992), who obtained a distance of 1,670 ±13 pc from ZAMS fitting of the cluster. A possible cause of this difference is the different level of obstruction of light and star reddening of the stars of the cluster. One more cepheid variable, V379 Cas, is also a possible member of NGC 129. Source: Wikipedia

Lum 17 x 120s
Red 54 x 180s
Grn 51 x 180s
Blu 54 x 180s

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Status	Advanced success
Started	...
Astrometry.net job	8517672
PixInsight job	WQ6N2BIX7M3UWBVMWQCC3BS69ZEOA17Q
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h30m06s.56
RA (top/left)	00h20m42s.86
RA (top/right)	00h22m24s.16
RA (bottom/right)	00h38m46s.20
RA (bottom/left)	00h38m33s.73

Dec (center)	+60°12′46″.6
Dec (top/left)	+61°33′38″.5
Dec (top/right)	+58°44′24″.3
Dec (bottom/right)	+58°49′32″.10
Dec (bottom/left)	+61°39′12″.1

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NGC 129 open star cluster

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