NGC 1807 & NGC 1817 (Gary Imm)

Celestial hemisphere: Northern · Constellation: Taurus (Tau) · Contains: NGC 1807 · NGC 1817

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NGC 1807 & NGC 1817

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NGC 1807 & NGC 1817

This object is a small pair of open clusters located 6000 light years away in the constellation of Taurus. NGC 1817 is the larger, more dense cluster of 300 stars on the left. NGC 1807 is the smaller but brighter grouping of 40 stars on the right which actually is not a cluster but simply a loose group of bright stars.

Interestingly, the cluster NGC 1817 has the highest number of Delta Scuti stars of any cluster in the sky. According to O'Meara, these are pulsating stars in a post-main-sequence stage of stellar evolution, with periods from 0.25 to 5 hours and light variations of less than 1 magnitude.

The most fascinating aspect of this object to me is the number of orange giant stars in NGC 1807. I count 10 bright orange stars in a vertical grouping with no bright blue stars between them. I don't recall seeing any other grouping of stars like this.

I think that the object's colloquial nickname is a bit derogatory, but not many clusters are graced with a nickname at all, so it is probably better than nothing.

Open Star Clusters
The refractors!
Cloudy Nights
ZWO ASI1600MM/QHY163M

Open Clusters
Secret Deep Catalog (Complete)

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Status	Advanced success
Started	...
Astrometry.net job	1915744
PixInsight job	8B610IU3SSPECEFNJ8LEE2VP3WXLG94E
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h11m25s.577
RA (top/left)	05h12m51s.115
RA (top/right)	05h08m44s.956
RA (bottom/right)	05h10m00s.481
RA (bottom/left)	05h14m05s.909

Dec (center)	+16°34′02″.90
Dec (top/left)	+17°07′50″.54
Dec (top/right)	+16°43′03″.70
Dec (bottom/right)	+16°00′12″.77
Dec (bottom/left)	+16°24′54″.25

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NGC 1807 & NGC 1817

NGC 1807 & NGC 1817

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NGC 1807 & NGC 1817

NGC 1807 & NGC 1817

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