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Found 5 results

  1. The Rosette Star Cluster and Nebula ( NGC 2244 & 2237 ) ( please click / tap on image to see larger ) This is the Inverted B&W version buried in my previous post ( I quite liked the way the inverted B&W brings out the star cluster and so I thought it deserved its own thread )
  2. ( please click / tap to see larger ) Identification: The Rosette Nebula ( NGC 2237 ) is a large, circular emission nebula in the constellation Monoceros. It surrounds a cluster of hot, young stars known as the Rosette Cluster ( NGC 2244 ). ( SkySafari ) NGC 2237, 2244 Caldwell 49, 50 North is up. .................. Capture Details: Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7 Mount: Skywatcher EQ8 Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D7500 (unmodified) (sensor 23.5 x 15.7mm, 5568x3712 @ 4.196um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 23 Dec 2017 ) 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO400. 10 x 240s + 5 each @ 1s to 120s imaged ~ +/- 1.5hrs either side of meridian maximum altitude ~ 51.3 deg above north horizon Processing ( Pixinsight ) Calibration: master bias, master flat and in-camera dark subtraction Integration in 9 sets HDR combination Image Plate Solution =================================== Resolution ........ 0.633 arcsec/px ( full size image ) Rotation .......... 0.181 deg Focal ............. 1367.90 mm Pixel size ........ 4.20 um Field of view ..... 58' 59.4" x 39' 15.0" Image center ...... RA: 06 31 55.638 Dec: +04 56 30.84 =================================== ... More information, etc., here:
  3. The Rosette Nebula and Cluster ( NGC 2237 and 2244 ) in the constellation Monoceros edit: updated 30th Dec with improved colour balance and slightly increased brightness ... ...... original: ( please click / tap on image to see larger and sharper ) Still a work-in-progress really... with only 10 x 4min exposures for the main 'lights' before the clouds came over. I will try to add some more data when the moon has gone I am still experimenting with how to get the best out of the D7500. With the very warm nights ( low to mid 20s all night ) the 'warm pixels' are very noticeable so I reverted to my old practice of in-camera dark subtraction. This worked quite well and produced a nice smooth noise floor in the integrated images - albeit at the expense of more exposures. ................. Identification: The Rosette Nebula ( NGC 2237 ) is a large, circular emission nebula in the constellation Monoceros. It surrounds a cluster of hot, young stars known as the Rosette Cluster ( NGC 2244 ). ( SkySafari ) NGC 2237, 2244 Caldwell 49, 50 North is up. .................. Capture Details: Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1400mm f4.7 Mount: Skywatcher EQ8 Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D7500 (unmodified) (sensor 23.5 x 15.7mm, 5568x3712 @ 4.196um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 23 Dec 2017 ) 9 sets of sub-images with exposure duration for each set doubling ( 1s to 240s ) all at ISO400. 10 x 240s + 5 each @ 1s to 120s imaged ~ +/- 1.5hrs either side of meridian maximum altitude ~ 51.3 deg above north horizon Processing ( Pixinsight ) Calibration: master bias, master flat and in-camera dark subtraction Integration in 9 sets HDR combination Image Plate Solution =================================== Resolution ........ 0.633 arcsec/px ( full size image ) Rotation .......... 0.181 deg Focal ............. 1367.90 mm Pixel size ........ 4.20 um Field of view ..... 58' 59.4" x 39' 15.0" Image center ...... RA: 06 31 55.638 Dec: +04 56 30.84 ===================================
  4. Reprocessed: The difference is fairly subtle unless one sees this version and the original together... Details: Rosette Nebula in Monoceros ( NGC 2237, 2238, 2239, 2244, 2246 ) by Mike O'Day ( 500px.com/MikeODay ). The Rosette Nebula surrounds a cluster of bright young stars (NGC 2244) and is around 5,200 light years from Earth. Links: https://500px.com/MikeODay http://photo.net/photos/MikeODay This image ~ RA 6h 31m, Dec 5deg 2'. Skywatcher Quattro 10" f4 Newtonian. Skywatcher AZ Eq6 GT Mount. Orion Short Tube 80mm guide scope & auto guider - PHD2. Baader MPCC Mark 3 Coma Corrector (no filter used). Nikon D5300 (unmodified). Field of view (deg) ~ 1.35 x 0.90..71 x 30 sec ISO 800. Pixinsight & Photoshop. 20 December 2015
  5. My first attempt at processing the subs I took last night. Not totally happy yet - next time I process it I think I need to boost the red in the mid tones somewhat to try to compensate for the filter in my standard Nikon D5300. Details: Rosette Nebula in Monoceros ( NGC 2237, 2238, 2239, 2244, 2246 ) by Mike O'Day ( 500px.com/MikeODay ). The Rosette Nebula surrounds a cluster of bright young stars (NGC 2244) and is around 5,200 light years from Earth. Links: https://500px.com/MikeODay http://photo.net/photos/MikeODay This image ~ RA 6h 31m, Dec 5deg 2'. Skywatcher Quattro 10" f4 Newtonian. Skywatcher AZ Eq6 GT Mount. Orion Short Tube 80mm guide scope & auto guider - PHD2. Baader MPCC Mark 3 Coma Corrector (no filter used). Nikon D5300 (unmodified). Field of view (deg) ~ 1.35 x 0.90..71 x 30 sec ISO 800. Pixinsight & Photoshop. 20 December 2015
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