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Binoc Obsrv List - Doubles in Pairs and Within OC

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#1 EdZ


    Professor EdZ

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Posted 11 July 2005 - 12:48 PM

I've already posted elsewhere a list of about 75 Binocular Doubles that I have observed. This first group of targets is a list of doubles that I observe in pairs, like the Double-Double for scopes, only these are all wider. The second group of targets is all doubles that can be found in Open Clusters, so when you go for those doubles you also get to see a cluster at the same time.

See also my list of DSOs in groups
Binocular Observing List - DSO's in Groups

Pairs of doubles

Struve 2470 and 2474 in Lyra,
The Double Double's double. Their separations of 13.4 and 16.2 respectively belie their difficulty. These are pretty faint pairs. 6.6-8.6/13.4" and 6.7-8.8/16.2" They were both seen as separated in 16x70 Fujinon's with difficulty.

Struve 2391 and HVI50 in Scutum,
Easy, both wide, both in the same low power view with M11 and the variable R Scutum.

Struve 232 and 6 Aries,
Easy, a mag8 double at 6.6" and a 3.9" double with color.
Stf 232, about one degree north east of 6 Tri, is 7.9-7.8/6.6". At 24x, all I could see was elongation, but with 20Tvplossls in the BT100 at 31x, this double was clearly split. 6 Tri is much closer at 5.3-6.9/3.9”, but is visible at 44x.

Struve 953 and Struve 954 in Monoceros
Struve 953 7.2-7.7/7.1" was an easy split with 25x100. It's about 1/2° south of the tip of the Christmas Tree cluster. In a 20x80 binocular I can only elongated this fairly even mag7 double. Struve 954 7.1-9.6/12.8" Although this one is much wider, it eludes the 25x100 binocs. I've tried many times but have not captured it at 25x. I had the BT100 set up with a 14mm radian giving 44x. The secondary of Struve 954 was even a little difficult for the BT100 at 44x.

Io (21) and Kappa (17) Bootes
Near the end of the handle of the Big Dipper. Io is 4.9-7.5/38” and kappa is 4.6-6.6/13.4”, not easy because of the 2 mag difference, but you can see it with a 15x70.

83 and 84 Leo
about 10° south of M65/M66. 83 is 6.2-7.9/28” and 83 is 5.1-8.0/91”

Gamma (12) Delphinus and Struve 2725
Gamma, 4.5-5.5/9.6” is an easy double for a 20x80, but will be difficult for a 15x70. Gamma Delphinus 9.6" has been cleanly split with 16x70 Fujinon. 2725 is a high-power pair at 7.6-8.4/5.8” that needs about 30x.

Double Stars within Open Clusters

Here’s the doubles culled out of my binocular list that all fall within open clusters. Many closer double’s are not included here since this list only went down to about 6” for binoculars to 25x.

34 Cas, phi, AC 5.1-7.8/134”, the eyes of the Owl Cluster, in NGC 457

Stf 264 in Markarain 6 in Cassiopeia. 8.5-9.5/16.6". Mrk6 is about 3° NE of Stock 2 the very large loose cluster that some call the running man cluster.

Stf 485, Cam 7.0-7.1/18”, 4h05m +61n, easy, in o.c. NGC 1502

A variable power binocular such as the BT100 at 30x should also be able to identify Stf 484, Cam 10.0-10.5/5.4", on the very western edge of NGC 1502

17 Com, 5.3-6.6/145”, in Mel 111, Berenices Hair

11 Lyr, Delta 1, 5.6-9.3/175”, in Steph 1

B440, Cyg, probably seeing AF, 6.8-7.8/36”, 20h07m +36n, in o.c. 6871

Stf 2624, Cyg, AB is 7.2-7.8/1.7”, AB-C is 9.1/43”, 20h04m +36.5n, seen as 6.7-9.1/43”, in o.c. B146

56 And, 5.7-6.0/190”, on the edge of o.c. NGC 752

S 445, Per, 7.3-8.2/74”, 4h20m +50.5n, in NGC 1545

B536, Tau, AB-C, 8.1-8.0/39”, in the center of M45, The Pleiades

10 Mon, 5.1-9.3/77”, C=9.3/81”, BC= 9.3-9.3/21”, outstanding triple in o.c. 2232

Stf 1121, Pup, 7.0-7.5/7.4”, or 7.9-7.9/ 7.4" (SkyCatalogue2000), 7h38m –24s, easily separated at 25x, in o.c. M47,

There is a close pair at the center of M36, but I could not find my notes that gave a listing to identify it. It's not listed in some books. When I find it I will add it here.
Found it. It is ADS 4194 9.1-9.4/11"

39 Cnc, 6.5-6.5/150”, Aa=8.9/134”, Ab=9.2/135”, brightest stars in north core of M44

Sigma Mon (15 Mon) in o.c. 2264 the Christmas Tree cluster in Monoceros. Sigma Mon the base or trunk of the Christmas Tree, has eight components, widely spaced.

Struve 848 Ori in o.c. 2169 the Butterfly Cluster in Orion’s upraised arm

Stf 2816 is in o.c. IC 1396 in Cepheus. Both the great bright nebula and the open cluster within have the same designation.

Worthy of note;
The Trapezium, the famous multiple at the core of M42, is in the Orion nebula.
41 Ori, theta 1, Trapezium ABCD, A-B= 8.7”, A-C=12.9”, C-D=13.3”, B-D=19.2”


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