Formalhaut (Alpha PsA)

 
Eddy O'Connor
Star: Formalhaut 
Date & Time: Dec, 1st 2000. 10.30-11.30 p.m local; UT +11 
Seeing: 8 <1-10 Seeing Scale (10 best)> 
Transparency: 10 
Temperature: 12ºC 
Other Conditions: Gentle breeze; low humidity 
Location of Site: Terara, New South Wales 
Australia,  S34.52, W150.38 degrees. 
Site Classification: Suburban 
Sky darkness: 5.5 (North), 6.5 (South) <Limiting magnitude> 
Binoculars: 7X35 Tento. 25X100 Somet 
HS: --
HS= Harshaw Scale1-5 (1 best) 
 
This mag. 1.2 blue/white star dominates an empty field. The ultra wide 5.5 mag companion lies about 27' away at PA 69 making them a naked eye pair in clear conditions and therefore visible with or without optical assistance.

Comments: I always see a Greenish hue to this star in binoculars and I often mistake it for Achernar. HS5. To me the companion star is too wide to offer interest as a double. The most striking double star in this area is Beta PsA, a fine object in small telescopes.