(Q75097016)
Statements
1±3 milliarcsecond per year
0±3 milliarcsecond per year
18.38±0.007
1 reference
18.73±0.02
18.294±0.008
1 reference
18.321±0.01
1 reference
18.168±0.028
1 reference
18.91
18.72
17.71±0.04
17.35±0.05
16.79±0.05
78,000,000 centimetre per square second