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Astrophotography by Bob Franke

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Jones 1 - Planetary Nebula (PN G104.2-29.6)

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Click the image for a 100% size wider view. (3300 x 2200 - 1.61 MB)

Instrument

12.5" RCOS @ ~ f/9 (2880 mm fl) at 0.64 arcsec/pixel. Shown at  0.64 and 1.28 arcsec/pixel.

Mount

Paramount ME

Camera

SBIG STL-11000 w/ FW8 filter wheel & AstroDon 3nm OIII and Gen-2 LRGB filters.

Acquisition Data

9/15/2017 to to 11/9/2017 Chino Valley, AZ.  with CCD Commander & CCDSoft.  AOL guided

Exposure

Lum

 405 min (27 x 15 min. each) Bin 1x1

OIII

1260 min (42 x 30 min. each) Bin 1x1

RGB

 675 min ( 15 x 15 min. each) Bin 2x2

eXcalibrator RGB ratios are 1.00, 1.05 & 1.19

Software & Processing Notes

 

  • CCDSoft, CCDStack, PixInsight, Photoshop CS6.

  • eXcalibrator v5.1 for (g:r) color balancing, using 118 stars from the SDSS-DR9 database.

  • CCDBand-Aid to repair KAI-11000M vertical bars.

  • CCDStack to calibrate all sub exposures.

  • PixInsight to register, normalize, data reject, combine the sub exposures, gradient removal, non-linear stretching with HistogramTransformation and to create the LRGB image.

  • Noiseware 5, a PhotoShop plug-in.

  • PhotoShop final touch-up includes adding the OIII data to the green and blue channels and  background noise reduction.

Comment

 

Shown rotated 113 counterclockwise.

Discovered by Rebecca Jones in 1941, Jones 1 (PN G104.2-29.6) is a planetary nebula in the constellation Pegasus. Little is written about the nebula. A singular reference gives it a distance of about 2,300 light years from Earth.  A small hydrogen cloud is visible to the left.

The central bright, very hot, blue star is the progenitor. The star will eventually cool and become a white dwarf. At this stage of evolution, it will no longer emit enough ultraviolet radiation to ionize the OIII gas. The nebula will then become invisible.

Jones 1 is classified as a type IIIb very faint planetary nebula. It is extremely difficult to see visually. Modern CCD photography and aggressive image processing changes all that.