Celestial hemisphere:  Northern  ·  Constellation: Leo (Leo)  ·  Contains:  NGC 3185  ·  NGC 3187  ·  NGC 3189  ·  NGC 3193
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HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013
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HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013

Equipment

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Acquisition details

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Description

This is an easy find with the Telrad from bright stars in Leo, and the brightest fuzzies are easily visible with 1 sec exposures at this focal length in the AT8IN. Good conditions: clear, with no wind to speak of. I'm using 480 s subs and the histogram is still on scale. This is the first time I've used the chiller since last fall. ~ 6 V, 1.5 A, 3.5 °C falling to -0.5 °C. Performed a meridian flip and continued imaging. Eventually got ice on the imager, which ended the session. I had lots of guiding issues; I need a better cable management system and need to retune the mount. So the resolution is not as good as I'd hoped for, but considering all the problems tonight this was OK. However, I need to redo the flats for this and process it again; I'll bet it comes out better if my flats don't have frost all over the sensor!

The C revision used only the subframes where there was no evidence of ice on the sensor, and I did not do flats for this one. Even though it is a bit noisier, it is much better in my opinion.

In the D revision, I removed a few hot pixels I'd missed earlier (and they are definitely hot pixels). I'd hate to think I had discovered a supernova or something!

Date: 2 Apr 2013

Subject: HGC 44 (ARP 316) Galaxy Cluster in Leo

Scope: AT8IN + High Point Scientific Coma Corrector

Filter: None

Mount: CG-5 (Synta motors)

Guiding: 9x50 Finder/Guider + DSI Ic + PHD 1.14.01

Camera: DSI IIc (chiller, T = 0 °C)

Acquisition: Nebulosity 3.1.4, no dither

Exposure: 33x480 s

Stacking: Neb 3, bad pixel map, bias included, normalize first, trans+rot align, 1.5 SD stack.

Processing: StarTools 1.3 Crop, Develop, Contrast, HDR:Equalize, Sharp, Deconvolute, Wipe, Develop, Track, Life:Isolate, Magic:Shrink. CS6 Astronomy Tools increase star color, Layer masked Unsharp Mask, AstroFrame.

Comments

Revisions

  • HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    Original
  • HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    B
  • HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    C
  • HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    D
  • HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    E
  • Final
    HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden
    F

Sky plot

Sky plot

Histogram

HGC 44 (ARP 316) Galaxy Cluster in Leo, 2 Apr 2013, David Dearden