Tuesday, April 26, 2016

reviewed mu Dra

The robot at SMU made the image of region around μ (mu) Draconis available (ID 1174).

Had a bit of a scare. Upon Mr Chapman's suggestion, I had not aimed directly at Arrakis, for fear that the automated routines would override the exposure settings, on detecting a bright target. So I had used the nearby star SAO 30242 (aka HD 234387). The queue notice had returned a good response. But the subject line and body in the image "ready" notice  showed SAO3024! Yikes. Might it have gone to a different star? Downloaded the JPEG.

luminance photo of region near double star mu Dra

15 seconds. North is down; east is right. No problem. μ Dra is at the bottom-left.

w00t! I can see the C star! And the primary looks elongated to the north-south. All right!

Holy mackerel. On deep diving, I can easily see GSC 03890-0238, down and left of mu, at magnitude 16.85 (poor quality data according to SkyTools), along with its companion J170510.7+542949 at mag 18.13. To the right of that pair, I can see J170516.8+543008 at mag 19.01 and its partner J170516.5+543019 at 18.76)! Wow. Mag 19 stars in a 15 second shot!

Curiously, I see 3 stars near mu, up and left, which are not shown in the software. Regardless...

I'm very happy to tag the C star. And if I drop the exposure, it should improve the view of A and B.

This is very neat. Using BGO to verify or check impressions from visual observing sessions... Gathering more data, to add to the pile, on Arrakis. I like it!


Shot later for 10 seconds.

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