Visual magnitude differences.

Explanation


One arc second radius

-
 UCAC4 Tycho SAO WDS GCVS Bright
Star
UCAC4
0
0
2
0.18
0.21
2,330,950
0.58
0.45
82,742
0.42
0.59
94,341
0.67
0.78
12,405
0.67
1.2
5,004
Tycho
0.18
0.21
2,330,950
0.79
0.64
13,040
0.38
0.32
83,736
0.25
0.47
92,229
0.44
0.74
9,906
0.13
1
5,104
SAO
0.58
0.45
82,742
0.38
0.32
83,737
0.67
0.74
6
0.43
0.45
14,054
0.32
0.37
2,127
0.12
0.16
7,431
WDS
0.42
0.59
94,341
0.25
0.47
92,229
0.43
0.45
14,054
0.11
0.47
88,084
0.63
0.96
2,500
0.21
0.46
3,267
GCVS
0.67
0.78
12,405
0.44
0.6
9,906
0.32
0.37
2,127
0.63
0.96
2,500
3.9
3.7
8
0.14
0.33
715
Bright
Star
0.67
1.2
5,004
0.13
0.34
5,104
0.12
0.16
7,431
0.21
0.46
3,267
0.14
0.33
715
0.31
0.33
34

Two arc second radius

-
 UCAC4 Tycho SAO WDS GCVS Bright
Star
UCAC4
0.51
0.51
96
0.18
0.22
2,378,721
0.58
0.43
164,534
0.43
0.6
99,489
0.67
0.78
14,140
0.69
1.2
6,938
Tycho
0.18
0.22
2,378,721
0.79
0.64
13,062
0.39
0.33
166,688
0.26
0.49
95,671
0.44
0.7
11,066
0.14
0.87
7,133
SAO
0.58
0.43
164,535
0.39
0.33
166,688
0.94
1.1
10
0.45
0.45
26,781
0.33
0.42
4,094
0.12
0.16
8,482
WDS
0.43
0.6
99,489
0.26
0.49
95,671
0.45
0.45
26,781
0.11
0.47
88,238
0.7
1.1
3,017
0.22
0.46
4,919
GCVS
0.67
0.78
14,140
0.44
0.6
11,066
0.33
0.42
4,094
0.7
1.1
3,017
3.1
3.6
10
0.16
0.4
1,026
Bright
Star
0.69
1.2
6,938
0.14
0.35
7,133
0.12
0.16
8,482
0.22
0.46
4,919
0.16
0.4
1,026
0.47
0.54
42