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Jones-Emberson 1 (Revisited)  - A Very Blue White Dwarf, 


            Jason Guenzel
Jones-Emberson 1 (Revisited)  - A Very Blue White Dwarf

Jones-Emberson 1 (Revisited) - A Very Blue White Dwarf

Technical card

Resolution: 1607x1080

Dates:Feb. 11, 2016March 11, 2016March 12, 2016March 17, 2016March 26, 2016March 29, 2016Oct. 25, 2018Nov. 19, 2018Dec. 9, 2018Jan. 4, 2019Jan. 5, 2019Jan. 13, 2019Jan. 14, 2019

ZWO Blue 1.25": 15x300" -30C bin 1x1
Astronomik Deep-Sky B 1.25": 25x240" -20C bin 1x1
Astronomik Deep-Sky G 1.25": 25x240" -20C bin 1x1
Astronomik Deep-Sky R 1.25": 25x240" -20C bin 1x1
ZWO Green 1.25": 15x300" -30C bin 1x1
Astronomik H-alpha 6nm CCD 1.25": 81x240" (gain: 139.00) -20C bin 1x1
Astronomik L-3 UV-IR Block 1.25": 168x180" -20C bin 1x1
ZWO Luminance 1.25": 135x300" -30C bin 1x1
ZWO Red 1.25": 15x300" -30C bin 1x1

Integration: 33.8 hours

Darks: ~50

Flats: ~50

Bias: ~256

Avg. Moon age: 12.05 days

Avg. Moon phase: 42.54%

Bortle Dark-Sky Scale: 5.00 job: 2504001

RA center: 119.464 degrees

DEC center: 53.422 degrees

Pixel scale: 0.874 arcsec/pixel

Orientation: 248.392 degrees

Field radius: 0.235 degrees

Data source: Backyard


Jones-Emberson 1 is a planetary nebula about 1600 light years away in the constellation Lynx. It is also known by the name corresponding to its galactic coordinates, PK164+31.1, which doesn't exactly roll off the tongue. Although incredibly faint with low surface brightness, it is actually one of the larger planetary nebulae in the night sky.

Long ago, the 16.8-magnitude central white dwarf collapsed from the original progenitor star. It shines a brilliant blue. As it compacted, it shed the outer shells of slowly expanding hydrogen gas. The central "void" is filled by a diffuse oxygen cloud. Together, the combination of emission from these gasses tint the nebula a range of rich tones.

One interesting aspect of this nebula is that there are at least a few background galaxies visible when looking through the central void. In fact, the field is rich with far-flung galaxies.

This image was compiled from two complete data sets I captured three years apart. Because of the incredible faint detail available in this one, I may come back a third time. But, for now, we'll say this year's revision is done.




Jason Guenzel

Sky plot

Sky plot


Jones-Emberson 1 (Revisited)  - A Very Blue White Dwarf, 


            Jason Guenzel