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Observatory Parameters
May 27
Lat. 39.0, Lon. -77.5
Clouds: Seeing:
Waxing Gibbous
18:35 04:54
A Cluster of Pearls in the Southern Skies ( NGC 3766 " The Pearl Cluster" ) by Mike O'Day ( 500px.com/MikeODay ) Shimmering like a pearl to the naked eye, this open cluster of mostly young blue stars ( known as the "Pearl Cluster" ) is approximately 5500 light years from Earth and was discovered by Abbe Lacaille in 1752 from South Africa. This HDR "true colour" image is constructed from 11 sets of exposures ranging from 1/4 sec ( to capture the centre of the brighter stars ) through to 240 seconds ( for the fainter stars of the Milky Way ). Total exposure time was around 5 hours. 12 April 2018 Image details: Field of view ..... 58' 49.8" x 39' 36.4" Image center ...... RA: 11 36 03.890 Dec: -61 35 30.17 Resolution ........ 0.586 arcsec/px ( full size image ) Orientation: North is up Telescope: Orion Optics CT12 Newtonian ( mirror 300mm, fl 1200mm, f4 ). Corrector: ASA 2" Coma Corrector Quattro 1.175x. Effective Focal Length / Aperture : 1470mm f4.7 Mount: Skywatcher EQ8 Guiding: TSOAG9 Off-Axis-Guider, Starlight Xpress Lodestar X2, PHD2 Camera: Nikon D5300 (unmodified) (sensor 23.5 x 15.6mm, 6016x4016 3.91um pixels) Location: Blue Mountains, Australia Moderate light pollution ( pale green zone on darksitefinder.com map ) Capture ( 12 April 2018 ): 11 sets of sub-images with exposure duration for each set doubling ( 1/4s to 240s ) all at ISO250. ( 70 x 240sec + 10 each forthe other durations ) Processing: Calibration: master bias, master flat and master dark Integration in 11 sets HDR combination Pixinsight April 2018 Links: www.500px.com/MikeODay www.flickr.com/photos/mike-oday www.photo.net/photos/MikeODay
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NGC 3766, Astrophotography by Mike_O_Day

Equipment

  • Imaging telescope / lens: Orion Optics UK Newtonian 300/1200 mm CT 12 ( f4 )
  • Imaging camera: Nikon D5300 (CMOS)
  • Mount: Equatorial Sky-Watcher EQ8
  • Guiding camera: Starlight XPress Lodestar X2
  • Accessories: Coma corrector ASA Quattro 1.175x 2.00"
    Off-axis guider TS Optics TSOAG9 2.00"
  • Processed with: PixInsight (Pleiades Astrophoto)

Frames / Subs

N/A

Acquisition

N/A

Spatial Info

  • Image Size: 2,732 x 1,839 pixels
  • Image Scale: 1.292 arcsec / pixel
  • Visual Field: 0º 58' 48''
  • RA Center: 11h 36m 03s
  • DEC Center: -61º 35' 30''
  • Orientation: 179.812 degrees E of N

Sky Maps

N/A

Comments

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