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Wed, 28 Dec 2016 - Eclipsing Binary predictions : 2017 Jan & Feb

Here are predictions for the most favourably timed eclipses from the UK during January and February:

Times are in UT (same as GMT).

Remember that these times are only approximate. Observed mid eclipse times can sometimes differ from predictions by half an hour or more.

RZ Cassiopeiae

Eclipses last 4.8h, with most of the brightness changes taking place during the middle 3 hours. The times shown below are for the mid-point of the eclipses

Jan:   3d   19:40 ,  5d  00:20 ,  9d  19:05 , 10d   23:45 , 15d  18:30,  16d   23:15 ,  21d  18:00 , 

        22d  22:40 ,  27d  17:25 ,  28d  22:05.

Feb:  3d   21:30 ,   5d  02:10 ,  9d  20:55 ,  11d  01:40 , 15d  20:20 ,  17d  01:05 ,  21d  19:50 ,  

        23d  00:40 ,  27d  19:15.

U Cephei

Eclipses last for approx 9 hours. Hence these eclipses will be underway by mid evening and will end in the early hours of the morning.

The times shown below are for the eclipse mid-point. Eclipses are total, so there is a period of constant brightness around the middle of the eclipse.

Jan:    3d  23:15 ,   8d  23:55 ,  13d  22:35 ,  18d  22:15 ,  23d  21:55 ,  28d  21:35.

Feb:   2d  01:15 ,   7d  00:55 ,  12d  00:35 ,  17d  00:15 ,  22d  23:55 ,  27d  23:35.

U Coronae Borealis

Eclipses last for approx 12 hours. The times shown below are for the eclipse mid-point.

With Corona Borealis not rising until after midnight, opportunities for seeing U CrB in eclipse will be rather limited.

Jan      3d   06:50 ,  10d  04:35 ,  17d  02:15 ,  24d  00:00  , 30d  21:40.

Feb    10d   06:15 ,  17d  03:55 ,  24d  01:40.

beta Lyrae

Both the deeper primary eclipse and less deep secondary eclipse can be followed visually. There is no period of constant brightness between eclipses.

Primary:        Jan   9-10  ,   22-23  ,              Feb   5-6  ,  18-19.

Secondary:  Jan   3-4  ,  16-17  ,  29-30  ,   Feb  12-13  ,  25-26.

beta Persei (Algol)

Eclipses last for approx 10 hours. The times shown below are for the eclipse mid-point. Eclipses are partial, so there is no spell of constant brightness around the middle of the eclipse.

Jan   11d   02:35 ,  13d  23:25 ,  16d  20:15 ,  19d  17:05

Feb    3d    01:10 ,   5d   22:00  ,   8d  18:45 ,   25d  23:40  , 28d  20:30

 

Added by: Tracie Heywood