Table 6: Determination of absolute magnitude from photometric data of C/1999 R1 (SOHO).
Magnitude Distance Phase angle   Absolute magnitude
m [mag] r (helioc.) [AU] d (geoc.) [AU] $\phi$ [deg]   cometary $H_{\rm C}$ [mag] asteroidal $H_{\rm MP}$ [mag]
6.6 0.0577 0.9978 116.9   12.84 12.84
6.5 0.0573 0.9833 110.9   12.75 12.75
6.4 0.0572 0.9870 106.6   12.64 12.64
6.3 0.0573 0.9907 102.3   12.53 12.53
6.2 0.0575 0.9945 98.1   12.41 12.41
6.2 0.0580 0.9993 93.3   12.38 12.38
6.4 0.0592 1.0071 85.9   12.52 12.52
6.4 0.0600 1.0109 82.1   12.49 12.49
6.7 0.0609 1.0148 78.4   12.75 12.75
6.9 0.0619 1.0186 74.9   12.90 12.90
6.9 0.0645 1.0272 68.2   12.79 12.80
7.4 0.0676 1.0355 62.2   13.17 13.20
7.4 0.0706 1.0427 67.7   13.07 13.11


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