Cookie consent

AstroBin saves small pieces of text information (cookies) on your device in order to deliver better content and for statistical purposes. You can disable the usage of cookies by changing the settings of your browser. By browsing AstroBin without changing the browser settings, you grant us permission to store that information on your device.

I agree
Contains:  NGC 3185, NGC 3187, NGC 3189, NGC 3193
Getting plate-solving status, please wait...

Hickson 44 / Arp 316

Technical card

Dates:March 27, 2019March 28, 2019April 2, 2019April 4, 2019April 7, 2019April 29, 2019May 7, 2019May 21, 2019Feb. 22, 2020Feb. 23, 2020Feb. 24, 2020Feb. 29, 2020March 5, 2020March 16, 2020March 18, 2020April 16, 2020April 17, 2020April 19, 2020

Blue: 123x150" (gain: 139.00)
Green: 162x150" (gain: 139.00)
Baader IR-Cut Moon & Skyglow Neodymium: 350x150" (gain: 139.00)
Red: 156x150" (gain: 139.00)

Integration: 33.0 hours

Avg. Moon age: 18.93 days

Avg. Moon phase: 27.79%

Bortle Dark-Sky Scale: 7.50

Basic astrometry details job: 3492953

RA center: 10h 18' 2"

DEC center: +21° 51' 36"

Pixel scale: 0.457 arcsec/pixel

Orientation: 273.321 degrees

Field radius: 0.352 degrees

Resolution: 4500x3250

Locations: Home Roof (Bortle 7-8 / Est. Sky Quality: 18.53), Springfield, PA, United States

Data source: Backyard


I started this one in March of 2019 but couldn't grab enough data since I have a tall tree directly to my east. I had to wait for it to clear that first (almost at the zenith), so I was generally only able to get 2 to 2.5 hours a night. I tried processing what I had last year, but the results were awful and I couldn't bring myself to publish it. I went after it again this year (with the replacement scope) and wasn't able to get the diffraction spikes to line up perfectly. I'm not sure whether that was due to photographer incompetence, manufacturing tolerances or time of year differences (by that I mean that I've noticed in the past that when I image something over a couple months, there is a slight rotation in the field even if I don't move my scope or camera). I thought about discarding last year's data to try to fix that, but the advantages of using all the data far outweighed the benefit of having sharper spikes.

Anyway: NGC 3187 has always reminded me of the Kataan Probe/Necklace from the Star Trek TNG episode "The Inner Light".



Chris Sullivan
License: None (All rights reserved)



Description: Crop


Description: Plate-solved version (uncropped)

Sky plot

Sky plot


Hickson 44 / Arp 316, 


            Chris Sullivan