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Jacoby-1 Planetary Nebula, 


            Jerry Macon
Jacoby-1 Planetary Nebula
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Jacoby-1 Planetary Nebula

Technical card

Dates:July 9, 2019July 10, 2019

AstroDon 5nm Oiii filter: 120x300" (gain: 99.00) -16C bin 1x1
Astrodon Gen 2 LRGB 36mm: 173x60" (gain: 99.00) -12C bin 1x1

Integration: 12.9 hours

Avg. Moon age: 7.96 days

Avg. Moon phase: 56.09%

Bortle Dark-Sky Scale: 4.00

Temperature: 10.00

Basic astrometry details job: 2798138

RA center: 15h 21' 44"

DEC center: +52° 21' 10"

Pixel scale: 0.701 arcsec/pixel

Orientation: 177.529 degrees

Field radius: 0.339 degrees

Resolution: 2680x2228

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 (OIII)
TV127is+ASI183MM at .75 asec/pix. (LRGB + OIII)
They were all registered to the best OIII image taken on the AG12.

Jacoby-1 is one of the faintest planetary nebulae. The Ha component is very small so I have only imaged OIII, with LRGB stars captured with the TV127is.

A planetary nebula forms when a star can no longer support itself by fusion reactions in its center. The gravity from the material in the outer part of the star takes its inevitable toll on the structure of the star, and forces the inner parts to condense and heat up. The high temperature central regions drive the outer half of the star away in a brisk stellar wind, lasting a few thousand years. When the process is complete, the remaining core remnant is uncovered and heats the now distant gases and causes them to glow.

Why "Planetary" Nebula?
Despite the name, these objects are totally unrelated to "planets". It is commonly thought that they may represent the final episode of the Sun's existence as a star. This concept has been questioned recently by Jacoby, Fullton, Morse, Kwitter and Henry ( 1997) and Bond (2001) - wherein evidence from globular cluster stars indicates that stars must be about 20% heavier than the Sun to form a PN. It is estimated that there are about 10,000 planetary nebulae in our galaxy, so they are a relatively common, although short-lived phase (about 25,000 years) of the stellar life cycle.



Jerry Macon
License: Attribution Creative Commons

Sky plot

Sky plot


Jacoby-1 Planetary Nebula, 


            Jerry Macon