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NGC 281 / IC 1590
#1
Greg
In ST, object NGC 281 also has an alternate name of IC 1590.

Those are actually 2 different objects.
NGC 281 is an HII region, whereas IC 1590 is an open cluster inside of 281.

Is there a way to separate these out? I presume in the next database release.

Thanks,
Steve
ver 4.0j R19 Visual Pro
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#2
Hi Steve,

Do you have a reference for these being two different objects rather than a duplication mistake in the NGC/IC? Something better than somebody's website, like maybe one of the NGC/IC project guys?
Clear skies,
Greg
Head Dude at Skyhound
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#3
Steve I get a lot of alternate names at that position:
Ambartsumian 5
Trapezium 13
Salukvadze 8

All indicate an asterism.
Sent you a PM
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#4
Greg,
Looking at Simbad...

For NGC 281, shows as a HII Region
https://simbad.u-strasbg.fr/simbad/sim-i...=submit+id

For IC 1590, as Open Cluster
https://simbad.u-strasbg.fr/simbad/sim-i...=submit+id

IC 1590 is a cluster within the HII region of NGC 281.

Steve
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#5
Greg this is what Harold Corwin and Brian Skiff had

IC 1590 is a star cluster involved in NGC 281 = IC 11. Bigourdan says of it,
"In the region of NGC 281, there is in addition to the nebulosity suspected
near BD +55 191, a large number of stars forming a very large cluster, without
concentration." He gives no position in his big tables, but does have one in
his tables of new objects, and in the CR article from which Dreyer took the IC
position. That position is about 3 arcmin southeast of the center of a group
of stars that Brian Skiff and I independently chose as IC 1590. I make the
diameters 6 arcmin by 4 arcmin, so am not convinced that this is Bigourdan's
object.
Without better evidence from Bigourdan's published material, though, there is
not much point in trying too hard to find this object. It sits in the middle
of a large region of star formation, and any position we take in the area will
get us some hot, young stars.

So I am guessing this maybe a questionable IC object
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#6
Thanks for all the info! I am updating my notes for the next time I am updating the open clusters.
Clear skies,
Greg
Head Dude at Skyhound
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#7
If you guys can find this thread, you will note that I have created a new discussion forum for the discussion of catalogs and designations. More posts are encouraged!
Clear skies,
Greg
Head Dude at Skyhound
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#8
(2022-11-09, 05:55 PM)theskyhound Wrote: If you guys can find this thread, you will note that I have created a new discussion forum for the discussion of catalogs and designations. More posts are encouraged!

GREAT!
Thanks for creating this.
Steve G
Cool
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