Object Name(s): Open clusters NGC 225, NGC 189 and Berkeley 3. Reflection nebula VdB 4. Dark nebula LDN 1290, 1291, 1298, 1300, and 1302.
The most prominent object in this Cassiopeia Milky Way star field is the open cluster NGC 225 and the associated reflection nebula VdB 4. NGC 225 was discovered by Caroline Herschel on September 27, 1783. NGC 225 is 2100 light years distant and its visual magnitude is 7.0. Also seen in this field is the open cluster NGC 189 (bottom center) which was also discovered by Caroline Herschel on September 27, 1783. NGC 189 is believed to be 3500 light years away and its visual magnitude is 8.8. The third open cluster in this field is Berkeley 3 (upper center), which is also known as Stock 24. Finally, several members of Beverly Lynds’ catalog of dark nebula can be seen in the field – LDN 1302 and 1291 are on either side of VdB 4. LDN 1300 is directly below NGC 225 and LDN 1298 and 1290 are toward the bottom of the frame and to the left of NGC 189.
Acquisition Date: September 29 – 30, 2019
Location: Tierra del Sol, San Diego County, California
• Imaging Scope – Takahashi FSQ-106 EDX IV
• Imaging Camera – ZWO ASI1600MM-C with EFW2
• Filters – Baader 36mm unmounted red, green and blue filters
• Guiding – Borg 77ED with ZWO ASI120MM-S
• Mount – Astro-Physics 900GTO
Camera Control – Sequence Generator Pro
Guider control – PHD2
• Imaging Camera – gain 76, offset 15 – cooled to -15
• Exposures – 24 x 240 seconds for each of the red, green and blue filtered exposures for a total exposure time of 4.8 hours.
PixInsight and Photoshop CC were used to process the images.
• PixInsight –
⁃ Image calibration, alignment and integration
⁃ MultiscaleLinearTransform on RGB image for noise attenuation
⁃ HistogramTransformation for histogram adjustment
⁃ CurvesTransformation for color saturation boost
• Photoshop –
⁃ additional adjustments to histogram and color balance
Thanks for looking. Click on the image below for a higher resolution version.