Tolong jelaskan mengenai Catatan dari Nebula Dumbbell

Radius = jark × sin(ukuran anguler/ 2) = 1,240 * sin(8′.0 / 2) = 1.44 ly

Sumbu semi-minor= jarak × sin(ukuran sumbu-minor / 2) = 1,240 * sin(5′.6 / 2) = 1.01 ly

Umur kinematik = sumbu semi-minor/ tingkat pengembangan= 1.01 ly / 31 km/s = 9.56 km / 31 km/s = 3.08 s = 9,800 yr

7.5 apparent magnitude - 5 * (log10(420 pc distance) - 1) = -0.6 absolute magnitude