Apparent multiple star BD +00 2087 in Canis Minor
Tuesday evening I continued my observing in Canis Minor. A constellation with no showpiece deep sky targets. Using a 10” f/4 NMT dob with Paracorr 2 and 17mm Ethos that gives 70x and fov 1.5 degrees. The transparency was below average with the crescent moon behind a sheet of cirrus in the west, with mostly clear to the east. Seeing was average to below average, so a night for low power observing only.
Uranometria shows tiny open cluster ADS 6366, which is curious as ADS is usually a double star label. Sky Safari and Interstellarum list this as Herschel 1. Its aka STF 1141 or HD 63035.
Based on visual appearance, it’s either a very multiple star or open cluster. If CMi has a showpiece, this is certainly a contender.
In the same low power field is the bright wide triple DD CMi or STTA 88.
In between these two obvious groups I saw what appeared to be a conspicuously “ large” star BD 00 +2087. I use Sky Safari on my iPad next to the scope as a quick reference. This is the only identifier it provides for this star.
At first glance this star was different from others in the field. It was like seeing a tiny planetary as “non stellar” It appeared to have some size.
On closer inspection companion star was faint but clearly seen. I kept seeing a second fainter glow appear and fade with the seeing. Not clearly seen as a star.
I increased magnification to 150x and was able to see this glow as a faint star, making a close triangle with the other two.
Neither Sky Safari or SkyTools 3 list this star as a multiple. The latest version of Sky Safari gives a Gaia catalog for these two companion stars.
The pic from Aladin clearly shows the triangle.
Finding this made for an interesting session and pleasant reward for viewing in the overlooked constellation.