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Getting plate-solving status, please wait...
Filters test - Jones-Emberson1 (JnEr1, PK164+31.1), 


            Ivaylo Stoynov
Filters test - Jones-Emberson1 (JnEr1, PK164+31.1)

Filters test - Jones-Emberson1 (JnEr1, PK164+31.1)

Technical card

Resolution: 1112x1024

Dates:April 20, 2018April 21, 2018

Astrodon HII-3nm: 8x1200" -25C bin 1x1
Astrodon O-III 3nm: 7x1200" -25C bin 1x1

Integration: 5.0 hours

Avg. Moon age: 5.32 days

Avg. Moon phase: 28.87% job: 2051480

RA center: 119.465 degrees

DEC center: 53.421 degrees

Pixel scale: 2.003 arcsec/pixel

Orientation: 149.655 degrees

Field radius: 0.421 degrees

Locations: Nedelkovo, near Sofia, Bulgaria

Data source: Backyard


The planetary nebula Jones-Emberson1 (JnEr1, PK164+31.1) is 1600ly way, around 4ly diameter. Its visible size is around 6'x7' spreading 14m which makes the surface brightness very low. The blue dwarf in the center that is driving the whole show is just 16.8m. And this is a spectacular show! Earth size dwarf is emitting enough UV power to blow and lit ~4ly big bubble!

This target is in my list for long time and decided to give a try as first light of new filters. It was not the best part of its season and lost a clear skies weekend struggling with hardware problem in filter-wheel... However managed to get some light and assure why Astrodon filters are so highly rated :) Definitely in the next season will take 3-4 times more total exposure and hope to fix the star elongation problem by then...



Ivaylo Stoynov
License: None (All rights reserved)

Sky plot

Sky plot


Filters test - Jones-Emberson1 (JnEr1, PK164+31.1), 


            Ivaylo Stoynov