Double in Puppis
Hi Ed
The only double that I can find with those similar magnitude estimates is ;-
k Puppis, mag. 4.4 / 4.6 sep. 9.8" p.a. 318 , both B6 ( bright white stars ) R.A. 07.38.8 / Dec -26.48 , which places the binary approx. 3 deg. N.E. of Aludra ( Eta Canis Majoris ).
According to all the observing manuals that I've checked it's classed as an showpiece binary. References were :- Hartungs, Cambridge Double Star Atlas, Double Stars for Small Telescopes ( Sissy Haas ) & Burnhams Celestial Handbooks.
Hope this helps with your identification.
Regards
Jeff
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