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Table:  Observing Working Table for Double Stars
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Summer & Fall Double Stars
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Double Star                     θ       V     Observed  Resolved  Comment
                               ('')            (y/n)     (y/n)    (Ours/Yours)
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Mizar/Alcor (ζ/80 UMA) (Col)   709    2.2,4.0                      OE, θ ≅ 12' 
ζ-1 Lyrae (SAO 67321) (Col)     44    4.3,5.9                      South-east of Vega (α LYR) 
                                                                     and in the same 
                                                                     finderscope FOV 
Albireo AB (β CYG AB) (RASC)    34.3  3.1,5.1 
Polaris AB (α UMi) (RASC)       18.2  2.0,8.7 
Mizar AB (ζ UMA) (RASC)         14.5  2.3,4.0                      OE 
Achird (η CAS AB, SAO 021732) (Col) 12   3.6,7.5   
Almach (γ AND)   (RASC)          9.5  2.3,5.1 
Rasalgethi (α HER AB) (RASC)     4.6  3.5,5.4                      OE 
δ CYG (Rukh, SAO 48796) (RASC)   2.7  2.9,6.3 
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Winter & Spring Double Stars
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Double Star                     θ       V     Observed  Resolved  Comment
                               ('')            (y/n)     (y/n)    (Ours/Yours)
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Mizar/Alcor (ζ/80 UMA) (Col)   709    2.2,4.0                      θ ≅ 12' 
Cor Caroli (α CVN) (Col)        19.4  2.9,5.6 
Polaris AB (α UMi) (RASC)       18.2  2.0,8.7 
Mizar AB (ζ UMA) (RASC)         14.5  2.3,4.0 
Achird (η CAS AB, SAO 021732) (Col) 12   3.6,7.5                   OE 
Sirius AB (α CMA) (RASC)         9.5 -1.4,8.5                      Hard to see B 
Rigel AB (β ORI) (RASC)          9.2  0.1,7.0                      OE 
Castor AB (α GEM) (RASC)         4.9  1.9,2.9                      North of Pollux 
Algieba (γ LEO) (RASC)           4.6  2.6,3.8 
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Notes:
1. θ is angular separation.
2. V is apparent V magnitudes for the two stars in a double star.
3. OE is abbreviates "Observe early" in the table.
4. Data for the double stars obtained from Coldfield Observatory: Top 200 most beautiful double stars (Col), Observer's Handbook, Royal Astronomical Society of Canada (RASC) (2012, 2013) R. C. Tanguay, 2006 Sky & Telescope (Tan), Wikipedia (Wik). The abbreviations appear by the star names. The "?" means no good source, but the value came from somewhere.
5. Some of the angular separations may be out of date because of the orbital motions of binary double stars. The variation of Sirius A and B is particularly rapid and its angular separation probably needs to be updated every 5 years or so (see star_sirius.html). Yours truly has tried to use the most current data yours truly can find. Also, yours truly has NOT been able to find the current separation of Achird and has just used a mean value.
6. The apparent V magnitude data came from some good sources. In any case, the best values are NOT needed for this lab.

Credit/Permission: © David Jeffery, 2015 / Own work.
Local file: local link: star_double_star_table.html.
File: Star file: star_double_star_table.html.

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