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| Catalogue and alternative designations |
Longmore 3, ESO 256-19, Sanduleak 2-6, Wray 17-1 |
| Type | Planetary nebula |
| Position | 07 14 49, - 46 57 40 |
| Constellation | Puppis |
| Camera and Telescope | STXL6303 and 36.8 cm Ritchey Chretien |
| Focal Ratio | F9 |
| Exposure Details | This is a LHaOIIIRGB image with Luminance = 50 minutes, Hydrogen Alpha = OIII = 180 minutes and Red = Green = Blue = 15 minutes. Luminance unbinned, colours binned 2x2 with Astrodon filters. |
| Description | Longmore 3 is a rarely imaged planetay nebula in Puppis. The magnitude is 11.8 and the angular size is 82". The bright star is magnitude 4.5. |