W Comae
(ON 231, B2 1219+28, 1ES 1218+285)

Coordinates (J2000)
R.A.:12 21 31.7    Dec.: +28 13 59

z = 0.102
E(B-V) = 0.023 mag

w1219+285.gif (22834 byte)

Field of view is 10'x 10'

Comparison stars

star B V Rc Ic   B-V V-R V-I
A 12.67 (0.06) 12.08 (0.02) 11.72 (0.04) 11.40 (0.04)   0.59 0.36 0.68
B 13.68 (0.02) 13.08 (0.02)       0.60    
D 16.37 (0.04) 14.82 (0.04) 13.86 (0.04) 12.68 (0.04)   1.55 0.96 2.14
E 16.45 (0.02) 15.60 (0.02)       0.85    
C1   16.60 (0.12) 16.03 (0.10) 15.50 (0.11)     0.57 1.10

Comparison stars from:
Wing 1973, AJ 78, 684-686 (B and V filters)
and Fiorucci & Tosti 1996, A&AS 403-407 (Rc, Ic filters and star C1)

Historical light curve

Photometrical data

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