γ and R Coronae Borealis

Gamma CrB is alpha's closest neighbour, about two degrees to the east. Move your glasses almost a complete field, putting gamma on the southwestern edge: binoculars.

Gamma (Struve 1967) is a very close binary, too close but for larger telescopes.

R CrB, nearly centred in the same field, is an intriguing variable. Usually a 5.9 magnitude, the star has been known to suddenly drop to near invisibility (around 14 visual magnitude) then take several months to regain its normal magnitude.


Now reverse directions, circling the 'crown' in a counter-clockwise motion. Leaving alpha, beta, and theta behind, move two binocular fields north to zeta CrB.

This small grouping has several attractive binaries; zeta is a telescopic binary (Struve 1965) of two bright stars: 4.9, 5.9; 306, 6.4".

Just below zeta about half a degree to the southwest is Struve 1964, a telescopic multiple system:
      AC: 8.1, 8.1; 85, 15"
      AD: 8.1, 9.0; 84, 14.8"

From zeta, move one and a half binocular fields southeast: binoculars. Click on sigma CrB for more details.

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1999-2014 by Richard Dibon-Smith.