ICQ
Below are the descriptive information (regarding comparison stars, which were formally published in the printed pages of the ICQ) that supplement tabulated data for the April 2010 issue of the ICQ.
Comet C/2006 OF2 (Broughton) 2010 Mar. 19.61: Guide 8.0 software used for comp.-star mags; comp. stars have B-V = +0.60 and +0.77 [YOS02]. Comet C/2007 Q3 (Siding Spring) 2009 Dec. 22.85, 2010 Jan. 26.86, Mar. 13.82, and 19.77: Guide 8.0 software used for comp.-star mags [NAG04]. 2010 Jan. 17.84: Guide 8.0 software used for comp.-star mags [MIY01]. Jan. 18.81 and Feb. 13.79: Guide 8.0 software used for comp.-star mags [YOS02]. Feb. 20.80-20.82: LONEOS AR_HER sequence used for comp.-star mags [YOS02]. Mar. 10.71, 11.72, 13.72, and 21.70: Guide 8.0 software used for comp.-star mags [HAR10]. Mar. 10.71 and 11.72: comp. stars have B-V = +0.44 [HAR10]. Mar. 13.72: comp. star has B-V = +0.56 [HAR10]. Mar. 21.70: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.65 [TSU02]. Mar. 21.70: comp. star has B-V = +0.54 [HAR10]. Apr. 25.72: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.68 [TSU02]. Comet C/2009 K5 (McNaught) 2010 Feb. 13.85, Mar. 19.79, 25.83, 26.81, Apr. 13.78, and 16.70: Guide 8.0 software used for comp.-star mags [YOS02]. Mar. 11.81, 19.81, and Apr. 24.76: Guide 8.0 software used for comp.-star mags [NAG04]. Mar. 21.76: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.52 [HAR10]. Apr. 12.33: comp. stars have V = 8.70 (B-V = +0.03) and 9.06 (B-V = +0.31) [AMO01]. Apr. 16.67: Guide 8.0 software used for comp.-star mags [HAS08]. Apr. 25.79: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.38 [TSU02]. Comet C/2009 O2 (Catalina) 2010 Feb. 20.85-20.86: LONEOS LT_DEL sequence used for comp.-star mags [YOS02]. Apr. 11.91: comp. star have V = 10.41 (B-V = +0.51) [AMO01]. Comet P/2009 Q5 (McNaught) 2009 Dec. 8.50: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.58 [TSU02]. 2010 Jan. 18.41: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.52 [TSU02]. Comet C/2009 R1 (McNaught) 2010 Apr. 12.35: comp. stars have V = 10.02 (B-V = +0.56) and 10.90 (B-V = +0.64) [AMO01]. Apr. 18.40: comp. stars have V = 9.96 (B-V = +0.52) and 10.64 (B-V = +0.43) [AMO01]. Apr. 24.79: Guide 8.0 software used for comp.-star mags [NAG04]. Comet P/2009 T2 (La Sagra) 2009 Dec. 8.53: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.52 [TSU02]. 2010 Jan. 18.47: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.59 [TSU02]. Comet P/2010 A3 (Hill) 2010 Apr. 25.49: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.62 [TSU02]. Comet P/2010 A5 (LINEAR) 2010 Mar. 19.77: Guide 8.0 software used for comp.-star mags; comp. stars have B-V = +0.48, +0.63, and +0.91 [YOS02]. Apr. 25.75: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.86 [TSU02]. Comet C/2010 F1 (Boattini) 2010 Mar. 19.68: Guide 8.0 software used for comp.-star mags; comp. stars have B-V = +0.63, +0.74, and +0.87 [YOS02]. Comet C/2010 G1 (Boattini) 2010 Apr. 25.47: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.63 [TSU02]. Comet P/2010 H2 (Vales) 2010 Apr. 25.67: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.58 [TSU02]. Comet 22P/Kopff 2009 Dec. 8.41: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.55 [TSU02]. 2010 Jan. 6.41: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.64 [TSU02]. Comet Comet 29P/Schwassmann-Wachmann 2010 Feb. 13.73: Guide 8.0 software used for comp.-star mags [YOS02]. Mar. 21.56 and Apr. 25.59: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.42 [TSU02]. Comet 30P/Reinmuth 2009 Dec. 8.56, Jan. 18.53, Feb. 21.44, Mar. 21.47, and Apr. 25.50: Guide 8.0 software used for comp.-star mags [TSU02]. Dec. 8.56: comp. star has B-V = +0.60 [TSU02]. 2010 Jan. 18.53: comp. star has B-V = +0.66 [TSU02]. Feb. 21.44: comp. star has B-V = +0.38 [TSU02]. Mar. 21.47: comp. star has B-V = +0.47 [TSU02]. Apr. 25.50: comp. star has B-V = +0.39 [TSU02]. Comet 74P/Smirnova-Chernykh 2010 Mar. 21.61: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.45 [TSU02]. Comet 81P/Wild 2009 Dec. 22.82, 2010 Jan. 26.83, Mar. 11.79, and 19.72: Guide 8.0 software used for comp.-star mags [NAG04]. 2010 Jan. 17.82: Guide 8.0 software used for comp.-star mags [MIY01]. Jan. 18.78, 26.85, Feb. 13.8, Mar. 19.68, 26.79, Apr. 13.75, and 16.67: Guide 8.0 software used for comp.-star mags [YOS02]. Feb. 20.77-20.79: LONEOS UKST 867 sequence used for comp.-star mags [YOS02]. Mar. 8.12: comp. stars have V = 8.93 (B-V = +0.47) and V = 9.34 (B-V = +0.37) [AMO01]. Mar. 11.07: comp. stars have V = 8.93 (B-V = +0.47) and V = 9.34 (B-V = +0.37) [AMO01]. Mar. 11.71, 13.73, 19.73, and 21.72: Guide 8.0 software used for comp.-star mags [HAR10]. Mar. 11.71 and 13.73: comp. stars have B-V = +0.65 and +0.64 [HAR10]. Mar. 12.17: comp. stars have V = 8.93 (B-V = +0.47) and V = 9.34 (B-V = +0.37) [AMO01]. Mar. 18.05: comp. stars have V = 8.93 (B-V = +0.47) and V = 9.34 (B-V = +0.37) [AMO01]. Mar. 19.64, Apr. 5.63, and Mar. 19.73 and 21.72: comp. star has B-V = +0.60 [HAR10]. Mar. 21.63: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.66 [TSU02]. Apr. 3.01: comp. stars have V = 8.87 (B-V = +0.46) and V = 9.35 (B-V = +0.56) [AMO01]. Apr. 13.06: comp. stars have V = 8.87 (B-V = +0.46) and V = 9.35 (B-V = +0.56) [AMO01]. Apr. 14.00: comp. stars have V = 8.87 (B-V = +0.46) and V = 9.35 (B-V = +0.56) [AMO01]. Apr. 16.17, 17.17, and 18.38: comp. stars have V = 7.66 (B-V = +0.23) and V = 8.87 (B-V = +0.46) [AMO01]. Apr. 16.66: Guide 8.0 software used for comp.-star mags [HAS08]. Apr. 25.69: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.97 [TSU02]. Apr. 29.47: StellaNavigator ver. 8.1 software used for comp.-star mags; comp. stars have B-V = +0.71, +0.73, and +0.85 [NAG08]. Comet 88P/Howell 2009 Dec. 8.39, 2010 Jan. 6.38, and Jan. 18.40: Guide 8.0 software used for comp.-star mags [TSU02]. 2009 Dec. 8.39: comp. star has B-V = +0.55 [TSU02]. 2010 Jan. 6.38: comp. star has B-V = +0.66 [TSU02]. Jan. 18.40: comp. star has B-V = +0.62 [TSU02]. Comet 94P/Russell 2010 Mar. 21.58: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.59 [TSU02]. Apr. 25.60: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.93 [TSU02]. Comet 107P/Wilson-Harrington 2009 Dec. 8.47: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.65 [TSU02]. 2010 Jan. 18.44: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.90 [TSU02]. Comet 118P/Shoemaker-Levy 2009 Dec. 8.59: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.68 [TSU02]. 2010 Jan. 18.57: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.48 [TSU02]. Feb. 21.48: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.65 [TSU02]. Mar. 21.48: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.56 [TSU02]. Apr. 25.53: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +1.13 [TSU02]. Comet 137P/Shoemaker-Levy 2009 Dec. 8.65: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.73 [TSU02]. Comet 149P/Mueller 2010 Mar. 21.66: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.56 [TSU02]. Comet 157P/Tritton 2009 Dec. 8.44: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.51 [TSU02]. 2010 Jan. 6.44: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.45 [TSU02]. Feb. 21.41: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.54 [TSU02]. Comet 169P/NEAT 2010 Mar. 21.53: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.37 [TSU02]. Comet 203P/Korlevic 2010 Mar. 21.44: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.50 [TSU02]. Comet 217P/LINEAR 2009 Dec. 8.64: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.50 [TSU02]. 2010 Jan. 18.54: Guide 8.0 software used for comp.-star mags; comp. star has B-V = +0.81 [TSU02].