Thursday, July 13, 2017

IC 4665

I was not planning to re-image this, again this was in the right location and I did not want to image a nebula as the moon was up.  I actually forgot I already imaged it until after I did it. Oh well.  Oddly enough additional data seems to have taken away some of the smaller stars.  The sub frames were not as dark as the first set perhaps because the moon was out the second time or it may not have been as clear as I thought.  However, the noise was diminished with the additional sub-frames. 

IC 4665 is one of the brighter Milky Way clusters missing not only in the Messier Catalog, but also in the NGC, because it is so loose and coarse. This cluster, located in Ophiuchus, is a good object for binoculars or wide-field telescopes such as the ED80. The cluster is estimated to be 36 million years and at a distance of 1,400 light years. Also, IC 4665 is heading towards us at 12 km/sec (source: messier.seds).

So I imaged IC 4665 from the Happy Frog while waiting for M24 to appear from behind some trees. I think selecting objects to image will be much easier once I am done with the Messier catalog as I just have to point to whatever object happens to be visible at the time I am outside. That is pretty much what I did for IC 4665, I was not planning imaging it, I just had the time and it was in the right location for me to observe it.

Original (6/27)

Updated with color adjustment (6/27)

Updated with more data (6/27 and 9/9)

IC 4665
Location: Happy Frog Observatory, Monroe, CT
Date: 6-27-17, 9/9/17
Camera: Canon EOS Rebel T3i(a), Backyard EOS
Telescope: Orion ED80 80mm f/7.5 Apochromatic Refractor Telescope
Barlow: None
Focal Length: 600mm
Focal Reducer: Orion 0.8x Focal Reducer for Refractor Telescopes
Mount: Orion Sirius EQ-G GoTo Telescope Mount
Filter: Astrodon UV/IR
Autoguiding: QHY-5L-II-M attached to an Agena 50mm Guide Scope with Helical Focuser
Exposure: 15 x 90s, 16 x 90
ISO: 1600
Temp: 20 C, 15 C
Post Processing: Deep Sky Stacker, Photoshop, Lightroom, Gradient Exterminator, Astronomy Tools, StarTools.


  1. Nice post! The image stabilization feature of Canon Binoculars is really helpful for capturing high resolution images.

  2. Thanks. I am actually looking for a pair of binoculars.