GSH 040+04+048

Right Ascension (hh mm): 18 49
Declination (deg): 8.25
Reference Velocity (km/s): 48.04
Delta RA (hh mm): 00 07
Delta Dec (deg): 1.75
Delta V (km/s): 15.47
Mean Angular Diameter (deg): 1.70
Shape parameter: 0.85
Comments:

Kinematic Distances Information
    Kinematic Distance (kpc): 3.3
    Allowed Range (kpc): 2.7 to 3.9
    Kinematic Distance 2 (kpc): 9.8
    Allowed Range (kpc): 9.2 to 10
Inferred Shell Size
    Shell Diameter (pc): 98
    Allowed Range (pc): 80 to 120
    Shell Diameter 2 (pc): 290
    Allowed Range (pc): 270 to 300
Distance Notes:
       Shell clearly associated with Galactic gas, so kinematic distances relatively reliable.

Expansion Velocity Information
    Velocity of Front Wall V_f (km/s): 33
    Minimum 'Shell-like' velocity V₁ (km/s): 39
    Maximum 'Shell-like' velocity V₂ (km/s): 54
    Lower Limit on Expansion Velocity (km/s): 11 (from V_f and V₂)