N185 Superbubble

N185 Superbubble

Supernova Remnant in the LMC

Constellation: Mensa
Ra: 04hr 52m 07s
Dec: -69d 55m 32s
Distance: 170,000 light years
Image Size: 35.5' x 35.5'
North: Up; East left



N185 nebula is a nearly circular 6.7 arcminute super bubble in the northwest portion of the Large Magellanic Cloud (LMC) 170,000 light years distant in the southern constellation of Mensa. It is similar to the N70 super bubble (see my image of N70 here). This image is 35.5′ x 35.5′. North is up and east is left. It uses 11.25 hours of exposures with the nebular detail and filamentary structure brought out by hydrogen (H-a) and oxygen (OIII) narrowband filters.

Lasker (Ast. J., 212, 390-395, 1977) pointed to strong sulfur (SII) emission similar in magnitude to H-a. He concluded that these LMC objects, like N70, are likely to be radiatively ionized nebula. He indicated that it is difficult to determine if these objects are the result of supernova explosions or supersonic flow of stellar winds. More recently, Zhang et al. (Ast. J., 792, 58-67, 2014) conclude that N185 is energized by a recent supernova. Its expansion velocity of nearly 200 km/s and X-ray luminosity are similar to many known supernova remnants in the LMC.

Other objects in the field are annotated below.

Exposure: 11.25 hrs Total; 5 hrs OIII, 4.5 hrs H-a, 1.75 hrs RGB
Telescope: PlaneWave CDK20, 0.5 m f/6.8 0.54 arcsec/pix
Mount: PlaneWave Ascension 200h
Oag: Astrodon MonsterMOAG
Acquisition: ACP-Expert
Calibration: CCDStack2
Observatory Site: iTelescope, Siding Spring, NSW, Australia
Camera: SBIG STX 16803
Filters: Astrodon 5nm H-a, 3nm OIII, Gen 2 RGB
Guider: Starlight Xpress Lodestar
Camera Operation: Maxim 5.24
Processing: Photoshop CC 2020
Image Date: 10/03/2019 - 10/24/2019


  1. Sakib

    Beautiful and majestic image, I think this is the first colour one. I wonder what hippies in San Francisco in 1967 would make of this superbubble (of love)?

  2. Josep Drudis

    Impressive!! Your fine processing has shown the external wisps very nicely! Great Image!


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