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Mon, 27 Feb 2017 - Eclipsing Binary predictions : 2017 March-May

Here are predictions for eclipses that are reasonably favourable from the UK during March, April and May:

Times are in UT (same as GMT, 1 hour behind BST - so, for example, 22.8h UT is 23.8h BST)

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 primary eclipses. Eclipses are not quite total, so there is no spell of constant brightnss at mid eclipse.

Date Mid-Eclipse (UT)
March 6 23.3h
March 8 4.0h
March 12 22.8h
March 14 3.5h
March 18 22.2h
March 20 2.9h
March 24 21.7h
March 26 2.3h
March 30 21.1h
April 1 1.7h
April 5 20.5h
April 7 1.2h
April 11 19.9h
April 13 0.6h
April 19 0.0h
April 24 23.5h
April 30 22.9h
May 6 22.3h
May 12 21.8h
May 14 2.5h
May 18 21.2h
May 20 1.9h
May 26 1.3h

U Cephei

Eclipses last for approx 12 hours. The times shown below are for the primary eclipse mid-point. Eclipses are total, so there is a period of constant brightness around the middle of the eclipse.

Date Mid-Eclipse (UT)
March 4 19.3h
March 9 18.8h
March 14 18.3h
   
April 21 4.1h
April 26 3.8h
May 1 3.4h
May 6 3.1h
May 11 2.8h
May 16 2.4h
May 21 2.1h
May 26 1.8h
May 31 1.4h

 

U Coronae Borealis

Corona Borealis is now becoming better placed in the evening sky ... but ...  the nights are now becoming too short for the whole eclipse to be observable in one session!

Eclipses last for approx 12 hours. The times shown below are for the primary eclipse mid-point.  Eclipses are not total, so there is no spell of constant brightness around the middle of the eclipse.

Date Mid-Eclipse (UT)
March 2 23.3h
March 9 21.1h
March 16 18.9h
March 27 3.3h
April 3 1.1h
April 9 22.7h
April 16 20.5h
May 4 2.7h
May 11 0.4h
May 17 22.2h
May 24 19.9h
   

Beta Lyrae

Beta Lyrae starts this spell as a morning sky object but becomes better placed by mid-spring.

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

Date Mid-Eclipse (UT)
March 3-4 primary
March 9 secondary
March 16-17 primary
March 27 secondary
March 29-30 primary
April 4-5 secondary
April 10-11 primary
April 17-18 secondary
April 23-24 primary
April 30-May 1 secondary
May 6-7 primary
May 13-14 secondary
May 19-20 primary
May 26-27 secondary

Beta Persei (Algol)

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

Although Algol is (just) circumpolar from the UK, it will be too low in the sky during late spring nights for accurate brightness estimates to be made.

Date Mid-Eclipse (UT)
March 18 1.4h
March 20 22.2h
March 23 19.0h
   
April 9 23.9h
April 12 19.8h
   
May 2 22.5h
   
May 23 0.2h
May 25 21.0h
 

Added by: Tracie Heywood