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(cba:news) V1674 Her, again (Joe Patterson) [2021-08-06T12:37:57Z]


Hi CBAers,

A couple of extra remarks on the (reasonably) new nova.

1. Try for long runs. As usual, we try to splice runs from distant longitudes to establish a consistent magnitude scale. (The fact that it's not a *standard* magnitude scale is not important or relevant.) Lately, that magnitude scale is Tonny Vanmunster's, since his runs from Spain have been the most abundant. So efforts to observe when Hercules is still reasonably available in the sky of western Europe would be nice. Probably we'll also have a well-established scale in the USA before long, once the western observers jump in.

2. I notice from data submissions that these magnitude offsets are changing significantly. That is very likely because people are changing comparison stars or filters, probably in response to the nova's rapid fading. Some indication of this in the submission (the data file, or the accompanying letter) would be helpful. My guess is you'll probably want to stick to unfiltered from here on, unless the nova unexpectedly brightens (a lot).

3. The pattern of variability is still not clear, but is something I've never seen before in a nova. And I've been looking a LONG time!

joe
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