MeWe 1-2

MeWe 1-2

Ancient Planetary Nebula in Carina

Constellation: Carina
Ra: 10hr 14m 25s
Dec: -58d 11m 48s
Distance: Unknown
Image Size: 30.2 x 30.2'
North: Up, East Left



MeWe 1-2 (PN G283.4-01.3) was discovered in a search of ESO R and SERC J images by Daniela Melmer and Ronald Weinberger (Mon. Not. R. astr. Soc., (1990) 243, 236-240).  They listed two tables and MeWe 1-2 was listed in the first table containing True Planetary Nebula (PN) as the second object  – hence, the designation of MeWe 1-2.  I measured the size of this circular object as 4.7’  The bright rim extends all the way around the PN, but appears slightly brighter on the western (right side).  This image is likely to be the first close-up color image of MeWe 1-2.  There is considerable hydrogen emission in the surrounding interstellar medium (ISM).  The brighter area in the northeast corner of the image is in the direction of WR18 and NGC 3199 (see my image here).  MeWe 1-2 is categorized as a WZ04 PN, which means that it is an old PN that significantly interacted with the ISM to the point where the central (progenitor) star is outside the nebular envelope.  I used a 5 nm H-a filter (rather than our 3 nm filter) to capture both H-a and NII, since MeWe 1-2 has NII >4x H-a and the 5 nm filter picks up both.  Here are additional technical links: and


Exposure: 10 hrs Total; 4 hrs H-a, OIII, 2 hrs RGB
Telescope: PlaneWave CDK20 0.5m f/6.8
Mount: PlaneWave Ascension A200h
Oag: Astrodon MonsterMOAG
Acquisition: ACP-8 Expert
Calibration: CCDStack v2
Observatory Site:, Siding Spring, NSW, Australia
Camera: SBIG STX16803
Filters: Astrodon 5 nm H-a, 3 nm OIII, E-Series RGB
Guider: SX Lodestar
Camera Operation: MaximDL 5.24
Processing: Photoshop CC 2017
Image Date: 02/06/2017 - 03/29/2017

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