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Contains:  NGC 4627, NGC 4631, NGC 4656
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The Whale, pup and Hockey Stick, 


            Steven Bellavia
The Whale, pup and Hockey Stick
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The Whale, pup and Hockey Stick

Technical card

Imaging telescopes or lenses: Home built 6-inch f/4 Newt

Imaging cameras: Canon EOS SL1

Mounts: Celestron AVX Mount

Guiding telescopes or lenses: Agena Astro 50mm f/3.9 Guidescope

Guiding cameras: ASI224MC

Software: Stark Labs Nebulosity 4.2  ·  Digital Photo Professional  ·  IDEIKI AstroPhotography Tool (APT)  ·  PHD2 Guiding

Accessory: Baader Mark-III MPCC Coma Corrector

Dates:June 1, 2016

Frames: 24x300" ISO1600

Integration: 2.0 hours

Avg. Moon age: 25.39 days

Avg. Moon phase: 18.18%

Bortle Dark-Sky Scale: 4.00

Basic astrometry details job: 1938703

RA center: 12h 42' 55"

DEC center: +32° 21' 3"

Pixel scale: 1.892 arcsec/pixel

Orientation: 179.135 degrees

Field radius: 1.013 degrees

Resolution: 3208x2139

Data source: Backyard


NGC 4631 (also known as the Whale Galaxy, or Caldwell 32) is an edge-on spiral galaxy in the constellation Canes Venatici. This galaxy's slightly distorted wedge shape gives it the appearance of a whale, hence its nickname. NGC 4631 has a nearby companion dwarf elliptical galaxy, NGC 4627. Sometimes referred to as "the pup" (even though a baby whale is a "calf"). NGC 4627 and NGC 4631 together were listed in the Atlas of Peculiar Galaxies as an example of a "double galaxy" or a galaxy pair. NGC 4631 and NGC 4627 are part of the NGC 4631 Group, a group of galaxies that also includes the interacting galaxies NGC 4656 and NGC 4657 (The "Hockey Stick" or "Crowbar"). The actual members of the group is currently undetermined, and is estimated to have 5 to 27 galaxies, all approximately 30 million light-years away.



Steven Bellavia
License: None (All rights reserved)

Sky plot

Sky plot


The Whale, pup and Hockey Stick, 


            Steven Bellavia