NGC6882 & NGC6885 Double Open Cluster (Tyco)

Celestial hemisphere: Northern · Constellation: Vulpecula (Vul) · Contains: NGC 6882 · NGC 6885 · The star 18Vul · The star 19Vul · The star 20Vul

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NGC6882 & NGC6885 Double Open Cluster

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NGC6882 & NGC6885 Double Open Cluster

NGC6885 & NGC6882 are very tight clusters, a misknown Double cluster in the sky. It's a bit confusing to clearly identified them, they are, regarding catalogs, superposed or juxtaposed. NGC 6882 should be a 18 arcmin cluster centered on 19 Velpucula, the yellow star on the bottom left.

NGC6885 is smaller (8') and centered on 20 Velpucula, the blue star at the center of the image.

Refering to Doug Scobel blog, catalogs are not coherent about their precise location on the sky :

"NGCs 6882 and 6885 are both listed in The Deep Sky Field Guide to Uranometria 2000 as being at magnitude 8.1, with diameters of 18 and 7 arc minutes, respectively. Given their coordinates, and their listed diameters, they ought to overlap. But what we see on star charts is another story. Sky Atlas 2000 plots only NGC 6885, as a small cluster centered exactly on 20 Vul. Uranometria 2000 (first edition) plots both clusters, also with NGC 6885 centered on 20 Vul, and with the larger NGC 6882 completely enclosing it, and with its center to the northwest of 20 Vul. Millennium Sky Atlas also plots both, and also with NGC 6882 enclosing NGC 6885 (also centered on 20 Vul), but shows NGC 6882’s center to the southwest of NGC 6882. And, the totally revamped Uranometria 2000 second edition shows NGC 6882 only, and doesn’t even plot its smaller companion! Obviously, there’s confusion regarding these two objects even among the sky cartographers!"

My opinion is that NGC6882 is a wider cluster constitued of medium stars centered on 20 Vel, overlapping NGC6885 that is the small group of blue faint stars just beside.

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NGC6882 & NGC6885 Double Open Cluster

NGC6882 & NGC6885 Double Open Cluster

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NGC6882 & NGC6885 Double Open Cluster

NGC6882 & NGC6885 Double Open Cluster

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