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Image of the day 03/19/2019

Getting plate-solving status, please wait...
HFG1 Ancient Planetary Nebula, 


            Jerry Macon
HFG1 Ancient Planetary Nebula
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HFG1 Ancient Planetary Nebula

Technical card

Dates:Nov. 20, 2018Nov. 21, 2018Nov. 26, 2018

AstroDon 5nm Ha filter: 184x300" (gain: 99.00) -20C bin 1x1
AstroDon 5nm Oiii filter: 182x300" (gain: 99.00) -15C bin 1x1
Astrodon Gen 2 RGB 36mm: 66x100" (gain: 99.00) -15C bin 1x1

Integration: 32.3 hours

Avg. Moon age: 14.39 days

Avg. Moon phase: 91.23%

Bortle Dark-Sky Scale: 4.00

Temperature: -5.00

Basic astrometry details job: 2575090

RA center: 3h 3' 41"

DEC center: +64° 54' 32"

Pixel scale: 0.701 arcsec/pixel

Orientation: 358.157 degrees

Field radius: 0.545 degrees

Resolution: 4461x3385

Locations: Dark Star Observatory, Taos, New Mexico, United States

Data source: Own remote observatory

Remote source: Non-commercial independent facility


Images from the following two scopes (piggybacked) contributed to this image:
AG12+ASI1600MM at .70 asec/pix
TV127is+ASI183MM at .75 asec/pix.
They were all registered to the best Ha image taken on the AG12.

Imaged on nights of 2018/11/20, 21, 23, 24, 25, 26.

HFG1 was discovered in the Milky Way Emission Line Study in 1982 by Heckathorn, Fesen and Gull (A&A, 114, 414, 1982). It is defined as a type F planetary nebula by Tweedy and Kitter (Astrophys. J Supp Series 107, 255-262, 1996) meaning that is appears to be uniformly filled. Its mag. 14.5 central star is a close, precataclysmic binary, V664 Cas. One report suggests that V664 left a trail at least 20′ long of ~10,000 year old shocked material as it ejected matter and moved through the interstellar medium (ISM).

The detail was brought out with 5 nm OIII and Ha filters and RGB data were added for star colors, but this object is extremely faint and requires long exposure to bring out any detail.

This object is so faint you can barely see any of it on a single frame. No wonder it took so long for HFG to discover it.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


HFG1 Ancient Planetary Nebula, 


            Jerry Macon