by KuriousGeorge » Mon Feb 27, 2017 4:59 am
Copyright KG Observatory.
NGC 4151 is an intermediate spiral Seyfert galaxy with weak inner ring structure located 19 megaparsecs (62 million light-years) from Earth in the constellation Canes Venatici. The galaxy was first mentioned by William Herschel on March 17, 1787. It is one of the nearest galaxies to Earth to contain an actively growing supermassive black hole. It was speculated that the nucleus may host a binary black hole, with about 40 million and about 10 million solar masses respectively, orbiting with a 15.8-year period. This is, however, still a matter of active debate.
Some astronomers nickname it the "Eye of Sauron" from its appearance.
Imaging telescope or lens: Celestron 8" EdgeHD
Imaging camera: QSI 660 WSG
Mount: Losmandy G-11
Guiding camera: Starlight Xpress Lodestar X2
Focal reducer: Celestron 0.7X
Software: PixInsight 1.8, PHD Guiding 2, Neat Image V7, Sequence Generator Pro, Maxim DL6, Adobe Photoshop CC 2014
Filters: Astrodon 1.25" R, Astrodon 1.25" B, Astrodon 1.25" G, Astrodon 1.25" L, Astrodon 1.25" 5nm Ha
Accessories: Innovations Foresight ONAG SC, Optec FocusLock, Starizona MicroTouch Autofocuser
Resolution: 1604x1184
Dates: Jan. 30, 2017, Feb. 13, 2017, Feb. 23, 2017, Feb. 24, 2017
Frames:
Astrodon 1.25" 5nm Ha: 22x600" -20C bin 1x1
Astrodon 1.25" B: 90x120" -20C bin 1x1
Astrodon 1.25" G: 30x120" -20C bin 1x1
Astrodon 1.25" L: 291x120" -20C bin 1x1
Astrodon 1.25" R: 29x120" -20C bin 1x1
Integration: 18.3 hours
Darks: ~20
Flats: ~80
Flat darks: ~80
Bias: ~20
Avg. Moon age: 17.89 days
Avg. Moon phase: 30.37%
Mean SQM: 19.75
RA center: 182.639 degrees
DEC center: 39.406 degrees
Pixel scale: 0.643 arcsec/pixel
Orientation: 88.734 degrees
Field radius: 0.178 degrees
Locations: Home, Rancho Santa Fe, California, United States
- Attachments
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![NGC4151_S1_Crop_Shadows_HVLG_Noise.jpg (190.5 KiB) Viewed 30912 times NGC4151_S1_Crop_Shadows_HVLG_Noise.jpg](./download/file.php?id=28530&t=1&sid=21d4e1d7da2fb54299e7229c49a017e0)
Copyright KG Observatory.
NGC 4151 is an intermediate spiral Seyfert galaxy with weak inner ring structure located 19 megaparsecs (62 million light-years) from Earth in the constellation Canes Venatici. The galaxy was first mentioned by William Herschel on March 17, 1787. It is one of the nearest galaxies to Earth to contain an actively growing supermassive black hole. It was speculated that the nucleus may host a binary black hole, with about 40 million and about 10 million solar masses respectively, orbiting with a 15.8-year period. This is, however, still a matter of active debate.
Some astronomers nickname it the "Eye of Sauron" from its appearance.
Imaging telescope or lens: Celestron 8" EdgeHD
Imaging camera: QSI 660 WSG
Mount: Losmandy G-11
Guiding camera: Starlight Xpress Lodestar X2
Focal reducer: Celestron 0.7X
Software: PixInsight 1.8, PHD Guiding 2, Neat Image V7, Sequence Generator Pro, Maxim DL6, Adobe Photoshop CC 2014
Filters: Astrodon 1.25" R, Astrodon 1.25" B, Astrodon 1.25" G, Astrodon 1.25" L, Astrodon 1.25" 5nm Ha
Accessories: Innovations Foresight ONAG SC, Optec FocusLock, Starizona MicroTouch Autofocuser
Resolution: 1604x1184
Dates: Jan. 30, 2017, Feb. 13, 2017, Feb. 23, 2017, Feb. 24, 2017
Frames:
Astrodon 1.25" 5nm Ha: 22x600" -20C bin 1x1
Astrodon 1.25" B: 90x120" -20C bin 1x1
Astrodon 1.25" G: 30x120" -20C bin 1x1
Astrodon 1.25" L: 291x120" -20C bin 1x1
Astrodon 1.25" R: 29x120" -20C bin 1x1
Integration: 18.3 hours
Darks: ~20
Flats: ~80
Flat darks: ~80
Bias: ~20
Avg. Moon age: 17.89 days
Avg. Moon phase: 30.37%
Mean SQM: 19.75
RA center: 182.639 degrees
DEC center: 39.406 degrees
Pixel scale: 0.643 arcsec/pixel
Orientation: 88.734 degrees
Field radius: 0.178 degrees
Locations: Home, Rancho Santa Fe, California, United States