GSH 054+01+031

Right Ascension (hh mm): 19 27
Declination (deg): 19.00
Reference Velocity (km/s): 31.03
Delta RA (hh mm): 00 08
Delta Dec (deg): 1.75
Delta V (km/s): 9.28
Mean Angular Diameter (deg): 1.70
Shape parameter: 0.99
Comments:

Kinematic Distances Information
    Kinematic Distance (kpc): 2.5
    Allowed Range (kpc): 2 to 3.2
    Kinematic Distance 2 (kpc): 7.5
    Allowed Range (kpc): 6.9 to 8.1
Inferred Shell Size
    Shell Diameter (pc): 74
    Allowed Range (pc): 59 to 95
    Shell Diameter 2 (pc): 220
    Allowed Range (pc): 200 to 240
Distance Notes:
       Greater distance more likely based on Galactic spiral structure in direction of shell

Expansion Velocity Information
    Velocity of Front Wall V_f (km/s): 23
    Velocity of Back Wall V_b (km/s): 42
    Expansion Velocity (km/s): 10
        Based on raw (not normalized) spectrum.
        Front wall estimate may be possibly unrelated gas, or suffer from data quality issues.
        Back wall estimate may be possibly unrelated gas, or suffer from data quality issues.
    Minimum 'Shell-like' velocity V₁ (km/s): 28
    Maximum 'Shell-like' velocity V₂ (km/s): 37
    Lower Limit on V_exp (km/s): 7 (from V₁ and V_b)