HFG2. An unusual planetary nebula

HFG2-Final-07-Cc

Click on the image for a larger version

 

The data for this image were taken by Don Goldman, whom I thank for authorizing me to process (and upload) this image. Don was awarded, for this image, the Webb Deep-Sky Society’s Picture of the Month, in February 2018.

This planetary nebula was discovered in 1983. After its discovery, there has been some discussion about its classification as planetary or having a different origin. D. J. Frew et al., brought back in 2012 its classification as “true planetary” and determined (together with over a thousand more nebulae) its Ha flux.

This image was taken with narrowband filters (bicolor) and mapped to natural color. Don is right when he emphasizes its resemblance with another (brighter) nebula: NGC 2359. To compare, see NGC 2359’s image here. NGC 2359 is not a planetary, but an emission nebula, fueled by a massive Wolf Rayet star.

 

Additional Information

Object

Name(s): HFG 2

Type:  Planetary Nebula

RA:  07h 42m 24s

Dec: -32º 47’ 45”

Constellation: Puppis

Size (arcmin): 3×2.5

Magnitude: +16

Distance: 6,000 ly

Image

Date: 2017-12-06 thru 2017-12-14

Location: iTelescope.net, SSO near Coonabarabran, NSW Australia

Size (arcmin): 36×32

Telescope: Planewave CDK 20” f/6.8

Camera: SBIG STX16803 (4096x4096pix)

Guiding: Astrodon MonsterMOAG off-axis guider

Total exposure: 20 hours (Ha: 8.5 h; OIII: 9 h; RGB: 2.5 h)

Processing: CCDStack, Photoshop CC 2018

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