GSH 056+02-074

Right Ascension (hh mm): 19 28
Declination (deg): 21.75
Reference Velocity (km/s): -74.16
Delta RA (hh mm): 00 5.5
Delta Dec (deg): 1.5
Delta V (km/s): 15.47
Mean Angular Diameter (deg): 1.40
Shape parameter: 0.70
Comments:
       GSH 056+02-074 may be one piece of a somewhat larger shell. There is possibly either a smaller adjacent shell or an additional piece of the same shell at similar velocities to the northeast, but we were unable to determine definitively due to data quality issues in that region.

Kinematic Distances Information
    Kinematic Distance (kpc): 18
    Allowed Range (kpc): 16 to 19
    Only one kinematic distance solution found for this radial velocity
Inferred Shell Size
    Shell Diameter (pc): 440
    Allowed Range (pc): 390 to 460
Distance Notes:
       Inferred shell size plausible in context of extent of Galactic Plane

Expansion Velocity Information
    Velocity of Front Wall Vf (km/s): -80
    Velocity of Back Wall Vb (km/s): -57
    Expansion Velocity (km/s): 12
        Back wall estimate may be possibly unrelated gas, or suffer from data quality issues.
    Minimum 'Shell-like' velocity V1 (km/s): -77
    Maximum 'Shell-like' velocity V2 (km/s): -62
    Lower Limit on Vexp (km/s): 9 (from Vf and V2)