Observed Energy Distribution: Q1226+023 log nu0 log nu1 log nu2 log nuFnu Date Aper Filter Instrument Ref (Hz) (Hz) (Hz) (Jy Hz) (") or or Detector Telescope 9.14 9.14 9.14 10.76( + 0.02 - 0.02 ) 1977 Jan 27 - - VLA AJ083,0685 9.66 9.66 9.66 11.28( + 0.02 - 0.02 ) 1977 Jan 27 - - VLA AJ083,0685 9.70 9.70 9.70 11.32( + 0.02 - 0.02 ) 1974 6.0 - WSRT AApS34,129 9.70 9.70 9.70 11.12( + 0.00 - 0.00 ) 1983 Nov 18.0 - VLA AJ098,1195 9.70 9.70 9.70 11.18( + 0.00 - 0.00 ) - 0.4 - VLA AJ087,0859 10.18 10.18 10.18 11.72( + 0.02 - 0.02 ) 1977 Jan 27 - - VLA AJ083,0685 10.35 10.35 10.35 11.86( + 0.06 - 0.07 ) 1977 Jan 27 - - VLA AJ083,0685 10.52 10.53 10.52 12.00( + 0.01 - 0.01 ) 1982 Mar 28 - - Chilbolton ApJ273,058 10.95 10.95 10.95 12.12( + 0.03 - 0.03 ) 1979 Jul - - NRAO11 AJ085,0363 10.95 10.95 10.95 12.06( + 0.03 - 0.04 ) 1978 Dec - - NRAO11 AJ085,0363 10.95 10.95 10.95 12.17( + 0.04 - 0.05 ) 1980 Mar 30 - - NRAO AJ087,0595 10.95 10.95 10.95 12.26( + 0.04 - 0.04 ) 1977 Jan 14 75.0 - VLA AJ083,0685 10.96 10.96 10.96 12.45( + 0.01 - 0.01 ) 1982 Jan 31 - - NRAO ApJ273,058 11.20 11.26 11.13 12.48( + 0.04 - 0.05 ) 1982 Jan 17 70.0 - NRAO ApJ273,058 11.44 11.50 11.36 12.48( + 0.04 - 0.04 ) 1982 Apr 22 65.0 - UKIRT ApJ273,058 11.48 11.30 11.70 12.49( + 0.08 - 0.10 ) 1977 Nov 25 55.0 - Hale ApJ262,460 11.58 11.64 11.50 12.52( + 0.07 - 0.08 ) 1982 Apr 22 58.0 - UKIRT ApJ273,058 11.89 11.96 11.80 12.58( + 0.07 - 0.09 ) 1982 Apr 22 55.0 - UKIRT ApJ273,058 12.10 12.10 12.10 12.57( + 0.05 - 0.06 ) 1982 May 1 85.0 - KAO ApJ273,058 12.45 12.45 12.45 12.75( + 0.11 - 0.15 ) 1982 May 1 33.0 - KAO ApJ273,058 12.48 12.40 12.56 13.01( + 0.01 - 0.01 ) 1983 300.0 IRAS4 IRAS(AO) Table11 12.48 12.40 12.56 12.92( + 0.04 - 0.05 ) 1983 15.0 IRAS4 IRAS ApJ315,074 12.70 12.57 12.87 12.98( + 0.00 - 0.00 ) 1983 300.0 IRAS3 IRAS(AO) Table11 12.70 12.57 12.87 13.04( + 0.02 - 0.02 ) 1983 15.0 IRAS3 IRAS ApJ315,074 12.71 12.71 12.71 < 13.11 1982 May 1 33.0 - KAO ApJ273,058 13.08 13.00 13.20 13.06( + 0.01 - 0.01 ) 1983 300.0 IRAS2 IRAS(AO) Table11 13.08 13.00 13.20 13.05( + 0.03 - 0.03 ) 1983 15.0 IRAS2 IRAS ApJ315,074 13.40 13.30 13.55 13.00( + 0.01 - 0.01 ) 1983 300.0 IRAS1 IRAS(AO) Table11 13.40 13.30 13.55 13.13( + 0.05 - 0.06 ) 1983 15.0 IRAS1 IRAS ApJ315,074 13.47 13.36 13.56 12.99( + 0.02 - 0.02 ) 1977 May 10.0 N Hale ApJ230,079 13.47 13.36 13.56 13.00( + 0.07 - 0.07 ) 1976 May 13 5.0 N Hale ApJS63,615 13.47 13.36 13.56 13.03( + 0.06 - 0.06 ) 1977 May 29 5.0 N Hale ApJS63,615 13.47 13.36 13.56 13.00( + 0.05 - 0.05 ) 1979 Jul 3 5.0 N Hale ApJS63,615 13.47 13.36 13.56 12.98( + 0.06 - 0.06 ) 1981 May 11 5.0 N Hale ApJS63,615 13.47 13.36 13.56 12.96( + 0.06 - 0.06 ) 1981 Jul 22 5.0 N Hale ApJS63,615 13.47 13.36 13.56 12.96( + 0.05 - 0.05 ) 1985 Jun 5 5.0 N Hale ApJS63,615 13.47 13.36 13.56 13.04( + 0.02 - 0.02 ) 1981 Mar 5 - N MtLemmon ApJ259,486 13.90 13.86 13.94 13.17( + 0.02 - 0.02 ) 1988 Apr 25 6.0 L' IRTF Table9 13.90 13.86 13.94 13.11( + 0.04 - 0.04 ) 1976 May 13 5.0 L' Hale ApJS63,615 13.90 13.86 13.94 12.99( + 0.03 - 0.03 ) 1977 May 29 5.0 L' Hale ApJS63,615 13.90 13.86 13.94 12.93( + 0.06 - 0.06 ) 1979 Jul 3 5.0 L' Hale ApJS63,615 13.90 13.86 13.94 13.11( + 0.03 - 0.03 ) 1981 May 11 5.0 L' Hale ApJS63,615 13.90 13.86 13.94 13.19( + 0.05 - 0.05 ) 1983 Jul 25 5.0 L' Hale ApJS63,615 13.90 13.86 13.94 13.10( + 0.03 - 0.03 ) 1985 Jun 5 5.0 L' Hale ApJS63,615 13.93 13.88 14.00 13.15( + 0.02 - 0.02 ) 1988 Apr 7 5.0 L MMT Table9 13.93 13.88 14.00 13.18( + 0.01 - 0.01 ) 1977 May 10.0 L Hale ApJ230,079 13.93 13.88 14.00 13.17( + 0.01 - 0.01 ) 1981 May 11 - L MtLemmon ApJ259,486 14.13 14.11 14.19 13.10( + 0.02 - 0.02 ) 1988 Apr 7 5.0 K MMT Table9 14.13 14.11 14.19 13.07( + 0.02 - 0.02 ) 1988 Apr 25 6.0 K IRTF Table9 14.13 14.11 14.19 13.15( + 0.02 - 0.02 ) 1982 Jun 11 12.0 K UoA1.55m/InSb ApJ296,423 14.13 14.11 14.19 13.06( + 0.00 - 0.00 ) 1982 Dec 20 12.0 K UoA1.55m/InSb ApJ296,423 14.13 14.11 14.19 13.16( + 0.00 - 0.00 ) 1983 Feb 15 12.0 K UoA1.55m/InSb ApJ296,423 14.13 14.11 14.19 13.11( + 0.00 - 0.00 ) 1983 May 4 12.0 K UoA1.55m/InSb ApJ296,423 14.13 14.11 14.19 13.11( + 0.00 - 0.00 ) 1984 Feb 27 12.0 K UoA1.55m/InSb ApJ296,423 14.13 14.11 14.19 13.07( + 0.01 - 0.01 ) 1979 Apr 10.0 K AAT MN199,943 14.13 14.11 14.19 13.12( + 0.01 - 0.01 ) 1977 May 10.0 K Hale ApJ230,079 14.13 14.11 14.19 13.18( + 0.02 - 0.02 ) 1981 Mar 14 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.08( + 0.03 - 0.03 ) 1976 May 13 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.07( + 0.03 - 0.03 ) 1977 May 29 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.09( + 0.03 - 0.03 ) 1979 Jul 3 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.12( + 0.03 - 0.03 ) 1981 May 11 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.12( + 0.04 - 0.04 ) 1981 Jul 22 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.16( + 0.04 - 0.04 ) 1983 Jul 25 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.08( + 0.03 - 0.03 ) 1985 Jun 5 5.0 K Hale ApJS63,615 14.13 14.11 14.19 13.20( + 0.00 - 0.00 ) 1981 May 11 - K MtLemmon ApJ259,486 14.26 14.23 14.31 12.95( + 0.02 - 0.02 ) 1988 Apr 7 5.0 H MMT Table9 14.26 14.23 14.31 12.93( + 0.02 - 0.02 ) 1988 Apr 25 6.0 H IRTF Table9 14.26 14.23 14.31 13.03( + 0.03 - 0.03 ) 1982 Jun 11 12.0 H UoA1.55m/InSb ApJ296,423 14.26 14.23 14.31 12.93( + 0.00 - 0.00 ) 1982 Dec 20 12.0 H UoA1.55m/InSb ApJ296,423 14.26 14.23 14.31 13.03( + 0.00 - 0.00 ) 1983 Feb 15 12.0 H UoA1.55m/InSb ApJ296,423 14.26 14.23 14.31 12.99( + 0.03 - 0.03 ) 1983 May 4 12.0 H UoA1.55m/InSb ApJ296,423 14.26 14.23 14.31 12.95( + 0.00 - 0.00 ) 1984 Feb 27 12.0 H UoA1.55m/InSb ApJ296,423 14.26 14.23 14.31 12.95( + 0.02 - 0.02 ) 1979 Apr 10.0 H AAT MN199,943 14.26 14.23 14.31 12.96( + 0.01 - 0.01 ) 1977 May 10.0 H Hale ApJ230,079 14.26 14.23 14.31 13.03( + 0.02 - 0.02 ) 1981 Mar 14 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.90( + 0.03 - 0.03 ) 1976 May 13 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.90( + 0.03 - 0.03 ) 1977 May 29 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.95( + 0.03 - 0.03 ) 1979 Jul 3 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.96( + 0.03 - 0.03 ) 1981 May 11 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.96( + 0.04 - 0.04 ) 1981 Jul 22 5.0 H Hale ApJS63,615 14.26 14.23 14.31 13.02( + 0.05 - 0.05 ) 1983 Jul 25 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.89( + 0.03 - 0.03 ) 1985 Jun 5 5.0 H Hale ApJS63,615 14.26 14.23 14.31 12.97( + 0.00 - 0.00 ) 1981 May 11 - H MtLemmon ApJ259,486 14.38 14.35 14.45 12.92( + 0.02 - 0.02 ) 1988 Apr 7 5.0 J MMT Table9 14.38 14.35 14.45 12.89( + 0.02 - 0.02 ) 1988 Apr 25 6.0 J IRTF Table9 14.38 14.35 14.45 13.05( + 0.02 - 0.02 ) 1982 Jun 11 12.0 J UoA1.55m/InSb ApJ296,423 14.38 14.35 14.45 12.93( + 0.00 - 0.00 ) 1982 Dec 20 12.0 J UoA1.55m/InSb ApJ296,423 14.38 14.35 14.45 13.06( + 0.00 - 0.00 ) 1983 Feb 15 12.0 J UoA1.55m/InSb ApJ296,423 14.38 14.35 14.45 12.99( + 0.00 - 0.00 ) 1983 May 4 12.0 J UoA1.55m/InSb ApJ296,423 14.38 14.35 14.45 12.92( + 0.00 - 0.00 ) 1984 Feb 27 12.0 J UoA1.55m/InSb ApJ296,423 14.38 14.35 14.45 12.91( + 0.02 - 0.02 ) 1979 Apr 10.0 J AAT MN199,943 14.38 14.35 14.45 12.91( + 0.02 - 0.02 ) 1977 May 10.0 J Hale ApJ230,079 14.38 14.35 14.45 13.03( + 0.03 - 0.03 ) 1981 Mar 14 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.90( + 0.04 - 0.04 ) 1976 May 13 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.91( + 0.03 - 0.03 ) 1977 May 29 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.92( + 0.04 - 0.04 ) 1979 Jul 3 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.98( + 0.03 - 0.03 ) 1981 May 11 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.96( + 0.03 - 0.03 ) 1981 Jul 22 5.0 J Hale ApJS63,615 14.38 14.35 14.45 13.02( + 0.04 - 0.04 ) 1983 Jul 25 5.0 J Hale ApJS63,615 14.38 14.35 14.45 12.90( + 0.03 - 0.03 ) 1985 Jun 5 5.0 J Hale ApJS63,615 14.38 14.35 14.45 13.01( + 0.01 - 0.01 ) 1981 May 11 - J MtLemmon ApJ259,486 14.45 14.45 14.45 12.97( + 0.02 - 0.02 ) 1978 Feb 10.0 - Hale ApJ230,079 14.50 14.50 14.50 12.99( + 0.02 - 0.02 ) 1978 Feb 10.0 - Hale ApJ230,079 14.52 14.46 14.58 13.05( + 0.03 - 0.03 ) 1986 May 13 14.0 I MtHopk(24in) Table6 14.52 14.46 14.58 13.16( + 0.00 - 0.00 ) 1982 Jun 11 12.0 I MtLemmon1.5m/PM ApJ296,423 14.52 14.46 14.58 13.14( + 0.00 - 0.00 ) 1982 Dec 20 12.0 I MtLemmon1.5m/PM ApJ296,423 14.52 14.46 14.58 13.19( + 0.00 - 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0.03 ) 1985 May 19 15.0 - LWP06010 RDAF 15.16 15.16 15.17 13.46( + 0.03 - 0.03 ) 1986 Dec 10 15.0 - LWP09679 RDAF 15.16 15.16 15.17 13.50( + 0.03 - 0.03 ) 1986 Dec 10 15.0 - LWP09680 RDAF 15.16 15.16 15.17 13.32( + 0.03 - 0.03 ) 1987 Jun 1 15.0 - LWP10892 RDAF 15.16 15.16 15.17 13.31( + 0.03 - 0.03 ) 1987 Jun 1 15.0 - LWP10893 RDAF 15.16 15.16 15.17 13.38( + 0.03 - 0.03 ) 1988 Jun 4 15.0 - LWP13357 RDAF 15.16 15.16 15.17 13.25( + 0.03 - 0.04 ) 1989 Feb 3 15.0 - LWP14957 RDAF 15.18 15.17 15.18 13.35( + 0.02 - 0.02 ) 1978 May 26 15.0 - LWR01565 RDAF 15.18 15.17 15.18 13.37( + 0.02 - 0.02 ) 1979 May 4 15.0 - LWR04454 RDAF 15.18 15.17 15.18 13.51( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - LWR13056 RDAF 15.18 15.17 15.18 13.58( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - LWR13564 RDAF 15.18 15.17 15.18 13.40( + 0.03 - 0.03 ) 1983 Apr 15 15.0 - LWR15739 RDAF 15.18 15.17 15.18 13.27( + 0.02 - 0.03 ) 1984 Jul 12 15.0 - LWP03757 RDAF 15.18 15.17 15.18 13.37( + 0.02 - 0.03 ) 1985 May 19 15.0 - LWP06010 RDAF 15.18 15.17 15.18 13.42( + 0.03 - 0.03 ) 1986 Dec 10 15.0 - LWP09679 RDAF 15.18 15.17 15.18 13.45( + 0.02 - 0.03 ) 1986 Dec 10 15.0 - LWP09680 RDAF 15.18 15.17 15.18 13.27( + 0.03 - 0.03 ) 1987 Jun 1 15.0 - LWP10892 RDAF 15.18 15.17 15.18 13.26( + 0.02 - 0.03 ) 1987 Jun 1 15.0 - LWP10893 RDAF 15.18 15.17 15.18 13.41( + 0.03 - 0.03 ) 1988 Jun 4 15.0 - LWP13357 RDAF 15.18 15.17 15.18 13.29( + 0.03 - 0.03 ) 1989 Feb 3 15.0 - LWP14957 RDAF 15.19 15.18 15.20 13.40( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.19 15.18 15.20 13.41( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.19 15.18 15.20 13.50( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.19 15.18 15.20 13.60( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.19 15.18 15.20 13.39( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.19 15.18 15.20 13.31( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.19 15.18 15.20 13.44( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.19 15.18 15.20 13.44( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.19 15.18 15.20 13.44( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.19 15.18 15.20 13.28( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.19 15.18 15.20 13.28( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.19 15.18 15.20 13.40( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.19 15.18 15.20 13.30( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.20 15.20 15.21 13.45( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.20 15.20 15.21 13.44( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.20 15.20 15.21 13.55( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.20 15.20 15.21 13.63( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.20 15.20 15.21 13.43( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.20 15.20 15.21 13.36( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.20 15.20 15.21 13.50( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.20 15.20 15.21 13.47( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.20 15.20 15.21 13.46( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.20 15.20 15.21 13.33( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.20 15.20 15.21 13.32( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.20 15.20 15.21 13.43( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.20 15.20 15.21 13.36( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.24 15.24 15.25 13.40( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.24 15.24 15.25 13.40( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.24 15.24 15.25 13.53( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.24 15.24 15.25 13.61( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.24 15.24 15.25 13.37( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.24 15.24 15.25 13.33( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.24 15.24 15.25 13.45( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.24 15.24 15.25 13.44( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.24 15.24 15.25 13.45( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.24 15.24 15.25 13.27( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.24 15.24 15.25 13.28( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.24 15.24 15.25 13.41( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.24 15.24 15.25 13.32( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.28 15.27 15.29 13.44( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.28 15.27 15.29 13.42( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.28 15.27 15.29 13.59( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.28 15.27 15.29 13.64( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.28 15.27 15.29 13.42( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.28 15.27 15.29 13.36( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.28 15.27 15.29 13.51( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.28 15.27 15.29 13.48( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.28 15.27 15.29 13.51( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.28 15.27 15.29 13.31( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.28 15.27 15.29 13.32( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.28 15.27 15.29 13.45( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.28 15.27 15.29 13.37( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.30 15.29 15.31 13.46( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.30 15.29 15.31 13.42( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.30 15.29 15.31 13.59( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.30 15.29 15.31 13.68( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.30 15.29 15.31 13.42( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.30 15.29 15.31 13.36( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.30 15.29 15.31 13.51( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.30 15.29 15.31 13.49( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.30 15.29 15.31 13.49( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.30 15.29 15.31 13.32( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.30 15.29 15.31 13.32( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.30 15.29 15.31 13.46( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.30 15.29 15.31 13.39( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.36 15.35 15.37 13.43( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.36 15.35 15.37 13.35( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.36 15.35 15.37 13.57( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.36 15.35 15.37 13.67( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.36 15.35 15.37 13.37( + 0.02 - 0.02 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.36 15.35 15.37 13.32( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.36 15.35 15.37 13.45( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.36 15.35 15.37 13.46( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.36 15.35 15.37 13.48( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.36 15.35 15.37 13.26( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.36 15.35 15.37 13.26( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.36 15.35 15.37 13.44( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.36 15.35 15.37 13.34( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 15.38 15.37 15.39 13.44( + 0.02 - 0.02 ) 1978 May 26 15.0 - SWP01642 RDAF 15.38 15.37 15.39 13.38( + 0.02 - 0.02 ) 1979 May 4 15.0 - SWP05116 RDAF 15.38 15.37 15.39 13.58( + 0.02 - 0.02 ) 1982 Apr 20 15.0 - SWP16803 RDAF 15.38 15.37 15.39 13.65( + 0.02 - 0.02 ) 1982 Jun 27 15.0 - SWP17302 RDAF 15.38 15.37 15.39 13.38( + 0.03 - 0.03 ) 1983 Apr 15 15.0 - SWP19731 RDAF 15.38 15.37 15.39 13.33( + 0.02 - 0.02 ) 1984 Jul 12 15.0 - SWP23444 RDAF 15.38 15.37 15.39 13.43( + 0.02 - 0.02 ) 1985 May 19 15.0 - SWP25974 RDAF 15.38 15.37 15.39 13.47( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29843 RDAF 15.38 15.37 15.39 13.47( + 0.02 - 0.02 ) 1986 Dec 10 15.0 - SWP29844 RDAF 15.38 15.37 15.39 13.30( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31077 RDAF 15.38 15.37 15.39 13.27( + 0.02 - 0.02 ) 1987 Jun 1 15.0 - SWP31078 RDAF 15.38 15.37 15.39 13.46( + 0.02 - 0.02 ) 1988 Jun 4 15.0 - SWP33704 RDAF 15.38 15.37 15.39 13.34( + 0.02 - 0.02 ) 1989 Feb 3 15.0 - SWP35471 RDAF 16.68 16.56 16.86 12.37( + 0.03 - 0.03 ) 1979 Jun 20 360.0 XS IPC5692 AAp253,035 17.38 16.59 18.38 12.37( + 0.01 - 0.01 ) 1979 Jun 20 360.0 IPC/MPC IPC5692 AAp253,035 17.99 17.68 18.38 12.69( + 0.00 - 0.00 ) 1985 May 18 - ME EXOSAT ApJ384,062 17.99 17.68 18.38 12.54( + 0.00 - 0.00 ) 1987 Jul 10 3600.0 LAC GINGA-LAC ApJ389,157 17.99 17.68 18.38 12.89( + 0.00 - 0.00 ) 1987 Dec 28 3600.0 LAC GINGA-LAC ApJ389,157 17.99 17.68 18.38 12.75( + 0.00 - 0.00 ) 1988 May 25 3600.0 LAC GINGA-LAC ApJ389,157 17.99 17.68 18.38 12.78( + 0.00 - 0.00 ) 1988 Jun 4 3600.0 LAC GINGA-LAC ApJ389,157 17.99 17.68 18.38 12.75( + 0.00 - 0.00 ) 1988 Dec 27 3600.0 LAC GINGA-LAC ApJ389,157 18.16 17.68 18.99 12.60( + 0.10 - 0.10 ) 1977 7200.0 HEAOA HEAO/A2 ASR03,312 18.16 17.68 18.38 12.71( + 0.03 - 0.03 ) 1977 7200.0 HEAO HEAO/A2 ApJ253,485 18.16 17.68 18.38 12.75( + 0.04 - 0.04 ) 1978 7200.0 HEAO HEAO/A2 ApJ253,485