Heckathorn-Fesen-Gull 1 (HFG 1) and Abell 6

 12 Apr, 2021
Heckathorn-Fesen-Gull 1 (HFG 1) and Abell 6
Objects: Less More
Technical Info
Telescope or Lens: 8" Celestron Schmidt-Cassegrain CPC800 GPS (XLT)
Camera: Starlight Xpress Trius SX694
Mount: equatorial wedge
Guide Scope: Baader 61x250mm
Guide Camera: ASI120MM
Software: MaxIm DL6, PHD2, PixInsight, StarTools, Photoshop CC, Zoner photo studio 14
Accessories: reducer Starizona Night Owl 0.4х, filters Astrodon LRGB E-series gen 2, Astrodon Ha 5nm, Astrodon OIII 3nm
Exposure:
24 x 150" ISO/Gain: 0 - Astrodon R
24 x 150" ISO/Gain: 0 - Astrodon G
24 x 150" ISO/Gain: 0 - Astrodon B
56 x 600" ISO/Gain: 0 - Astrodon Ha 5nm
14 x 900" ISO/Gain: 0 - Astrodon Ha 5nm
55 x 600" ISO/Gain: 0 - Astrodon OIII 3nm
Yellow zoneLight Pollution:
 Chervonograd, Ukraine
25 h 0 m
200
Heckathorn-Fesen-Gull 1 (HFG 1) and Abell 6 - two planetary nebulae among the clouds of hydrogen in the constellation Cassiopeia.

HFG 1 (also known as PK 136+05) is visible in my image in the upper left corner. HFG 1 is a large 8.3 arcminute faint evolved planetary nebula that was discovered in 1982 by Joy Heckathorn, Robert Fesen and Theodore Gull. In 2009, a massive trail of emission was discovered, which is caused by the planetary nebula moving through space and interacting with the interstellar medium. Another indicator of its motion through space and another product of its interaction with the ISM is a mainly OIII bowshock with a size of 15 arcminutes. Another structure associated with this planetary nebula is a Ha low ionisation structure embedded in the central shell. This planetary nebula also has a binary central star called V664 Cassiopeiae. The two stars are very close and rotate about each other in just 14 hours.
Abell 6 (PK 136+04.1) is a planetary nebula (with size about 3 arcminutes and magnitude of about 15m) in the bottom right corner of my image which is the smaller round bubble-like structure with a brighter wall. This nebula dicovered by George Abell in 1955.

This image taken over several nights in January-March 2021.
R-channel - 24 x 150 sec. bin 1x1;
G-channel - 24 x 150 sec. bin 1x1;
B-channel - 24 x 150 sec. bin 1x1;
Ha- 56 x 600 sec., 14 x 900 sec. bin 2x2;
OIII- 55 x 600 sec. bin 2x2.
Total integration time about 25 hours.
Resolution: 2711x2183 px
Scale: 4839 KB
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Comments

Борис, подскажите пожалуйста используете ли вы родной фокусер или поставили внешний? А если поставили внешний есть ли проблемы с установкой редуктора/корректора? Где-то прочитал, что использование редукторов на ШК-ах с внешними фокусерами сопряжено с проблемами нехватки хода фокусера и ГЗ - невозможно сфокусироваться.
13 Apr, 2021 Reply
Boris_US5WU Replied to Dmytre
Дмитрий, я использую внешний фокусёр и одновременно есть возможность использовать родную фокусировку подвижкой главного зеркала. Про невовзможность сфокусироваться с редуктором фокуса-впервые слышу. Любую нехватку фокуса во внешнем фокусёре всегда можно скомпенсировать подвижкой главного зеркала, с любым редуктором фокуса.
13 Apr, 2021 Reply
Как обычно - необычно и мощно =)
3 May, 2021 Reply
Boris_US5WU Replied to Fatalik
Спасибо!!!
3 May, 2021 Reply

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