Thursday, August 02, 2018

tried for 7 Per (Halifax)

Asked BGO to aim at GSC 03694 02703 so to capture multi-star 7 Persei, aka Burnham 1170. Also in the field is STI 1830. They are in an interesting field. These systems are not far from the Double Cluster.

The robot in Halifax reported that the observation "was not fully completed!" I only received the luminance and red channels. Clouds, it seems. Regardless, I can see the elements I was interested in.

multi-star system 7 Per in luminance

Luminance only, 0.5 second subexposures, 20 stacked shots. FITS Liberator, GIMP. North is up; east is left.

7 Persei is a 5-star system. The brightest star is 7 Per A proper.

Nearly due north of A is the B star. Rather dim.

SkyTools 3 Pro reports that C is here too but 0.3 seconds of arc from B! So, not possible for this imaging system. Probably not possible for my eyes either...

The D companion is the brighter star to the south-east. About double the AB split.

Finally, the E element is to the north again, slightly east, further still than B, and a touch dimmer than B. About 3 or 4 times the AB separation.

STI 1830 is an attractive pair well away from 7 Per, to the south-south-west. Relatively tight. ST3P says 10.2". Unequal. Nice.


Wikipedia link: 7 Persei.

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