(cba:news) QR And, and 1457+51

Joe Patterson jop at astro.columbia.edu
Thu Oct 1 09:21:51 EDT 2015


Hi CBAers,

See Enrique's note on QR And.  In addition, we're *roughly* done with 
this star for the year (a few more nights would be good).

SDSS1457+51 is quite a stretch in the morning sky... BUT its first-ever 
dwarf nova outburst, now ongoing, is a really attractive target for us. 
  We know the pulsation and orbital periods of this star, so we have 
PLENTY to compare the measures superhump period(s?) with.  Bright star 
too.  Perfect way to start the day.

Of course, ASASSN-15po is another great dwarf nova, probably the best of 
the year.  Follow till it sinks into the muck!

Back from computer woes over the last few weeks.  I'll be catching up!

joe



On 10/1/2015 8:33 AM, Enrique de Miguel wrote:
> Hi all,
>
>   Unless Joe thinks otherwise, we don't really want at a dense coverage of QR And,
> but just occasional coverage around the expected primary minimum.
> Just running ~4-5 hours around the minimum is typically enough for timing it
> with sufficient precision (which is what we really want).  And we just need to
> capture several minima during  the whole season - much better is they are well
> spaced in time during the season. The whole idea is to  track changes on Porb.
>
>   So in order to plan and optimize your observing night on this QR And,
> it's a good strategy to have an idea of when the eclipse is expected
> to take place. I'm listing below times for the occurrence
> of the main eclipse as determined from an approximate ephemeris (which
> can be improved, but that should be good enough for our purpose).
>
>
> Enrique
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