The Sky This Month: July—August 2003



The Summer Triangle: Lyra, Cygnus, and Aquila

Double stars:
 
Star Colour Magnitude Separation Position Angle
e Epsilon Lyrae Double Double white white white white 5.0 6.1 5.2 5.5 208" 2.6" 2.3" 357° 173° 94°
z Zeta Lyrae yellow yellow 4.3 5.9 44" 150°
d Delta Lyrae   4.5 5.6 630" 295°
b Beta Lyrae white white 3.4 8.6 46" 149°
o Omicron Cygni   3.8 4.8 6.7 107" 338" 173° 323°
b Beta Cygni Albireo yellow blue 3.1 5.1 34" 54°
16 Cygni   6.0 6.2 40" 133°
61 Cygni orange orange 5.2 6.0 28" 146°
g Gamma Delphinus yellow green 4.5 5.5 10" 268°

Variables:
 
Name Type Range Per Charts
R Sct RV Tau 4.8—8.5 146d http://www.aavso.org/charts/SCT/R_SCT/RSCT-A.GIF
http://www.aavso.org/charts/SCT/R_SCT/RSCT-B.GIF
cChi Cyg Mira 5.2-13.4 408d http://www.aavso.org/charts/CYG/CHI_CYG/CHICYG-A.GIF
http://www.aavso.org/charts/CYG/CHI_CYG/CHICYG-B.GIF
http://www.aavso.org/charts/CYG/CHI_CYG/CHICYG-D.GIF
http://www.aavso.org/charts/CYG/CHI_CYG/CHICYG-E.GIF
U Cyg Mira 7.2-10.7 463d http://www.aavso.org/charts/CYG/U_CYG/UCYG-A.GIF
http://www.aavso.org/charts/CYG/U_CYG/UCYG-B.GIF
http://www.aavso.org/charts/CYG/U_CYG/UCYG-C.GIF
http://www.aavso.org/charts/CYG/U_CYG/UCYG-D.GIF
SS Cyg U Gem 8.2—12.3 49.5d http://www.aavso.org/charts/CYG/SS_CYG/SSCYG-B.GIF
http://www.aavso.org/charts/CYG/SS_CYG/SSCYG-C.GIF
http://www.aavso.org/charts/CYG/SS_CYG/SSCYG-D.GIF
http://www.aavso.org/charts/CYG/SS_CYG/SSCYG-E.GIF

Deep sky objects:
 
Object NSOG Type Magnitude Surface brightness
Lyr: M 57 Ring nebula ***** PlanNeb 9.4 9.3
Cyg: NGC 6826 Blinking neb ***** PlanNeb 8.8 6.9
Cyg: Messier 29 ***** OpenClust 6.6 --
Cyg: NGC 6960/72 Veil neb **** SNrem -- --
Cyg: Messier 39 ***** OpenClust 4.6 --
Vul: M 27 Dumbbell nebula ***(**) PlanNeb 7.3 11.2
Vul: Cr399 Coathanger **** Asterism 3.6 --
Sct: M 11 Wild Duck cluster ***** OpenClust 5.8 --

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