To test Hipparcos/Tycho sequences against the existing ones, I have checked the field of SS Cyg (B. Skiff's compilation, vsnet 651). literature Tycho ------------------------------------------------------------ Name V B-V s sp remarks V B-V SS Cygni BD+42 4190 8.37 1.33 1 K2 = c 8.49 +1.31 8.51 1.33 2 8.47 1.20 3 HD 207020 9.10 0.40 5 B8 = e 9.43 +0.12 BD+43 4012 9.27 0.14 7 A2 9.20 +0.14 BD+43 4020 9.47 1.01 1 = f 9.55 +1.04 w 9.62 1.00 2 9.57 0.95 3 BD+42 4186 9.70 0.40 1 F0 = g 9.81 +0.39 9.86 0.36 2 9.72 0.54 3 9.80 0.38 4 GSC 3196-1019 10.29 0.41 1 = h 10.37 +0.38 GSC 3196-1824 10.73 0.23 1 = k 10.39 +0.72 10.86 0.18 2 GSC 3196-0857 10.80 0.55 1 = l 10.91 +0.39 10.92 0.51 2 10.73 0.47 3 10.88 0.52 4 GSC 3196-0815 11.01 1.15 2 = m 10.84 +1.34 GSC 3196-1015 11.32 1.10 5 = H&B 49 GSC 3196-0763 11.44 0.60 2 = n 11.30 +0.59 11.44 0.67 5 GSC 3196-0829 11.91 0.59 2 = o GSC 3196-1143 12.05 1.86 6 = Misselt 1 V-R=1.06 GSC 3196-0831 12.31 0.62 2 = p GSC 3196-0941 13.36 0.46 6 = Misselt 6 V-R=0.27