Hemisphere:  Northern  ·  Constellation: Cetus (Cet)  ·  Contains:  IC 1613  ·  IC1613  ·  PGC1203707  ·  PGC1205809  ·  PGC1206028  ·  PGC1206513  ·  PGC1207123  ·  PGC1207601  ·  PGC1208647  ·  PGC1211071  ·  PGC1212627  ·  PGC1217362  ·  PGC1217813  ·  PGC1220621  ·  PGC1221898  ·  PGC1224334  ·  PGC1224335  ·  PGC1225665  ·  PGC1225993  ·  PGC1226009  ·  PGC1226285  ·  PGC1227074  ·  PGC1228146  ·  PGC1228647  ·  PGC1229960  ·  PGC1231410  ·  PGC2800930  ·  PGC3095495  ·  PGC3095502  ·  PGC3750  ·  And 5 more.
Getting plate-solving status, please wait...
IC 1613, 



    
        

            Gary Imm
IC 1613, 



    
        

            Gary Imm

IC 1613

Getting plate-solving status, please wait...
IC 1613, 



    
        

            Gary Imm
IC 1613, 



    
        

            Gary Imm

IC 1613

Imaging telescopes or lenses: Takahashi TOA-130NFB

Imaging cameras: ZWO ASI 6200 MM Pro

Mounts: Astro-Physics Mach1GTO

Guiding cameras: ZWO ASI 174 MM Mini

Software: Main Sequence Software Sequence Generator Pro  ·  Pixinsight  ·  Stark Labs PHD2 2.6.3

Filters: Chroma Red 2" unmounted  ·  Chroma Ha 3nm  ·  Chroma Blue 2" unmounted  ·  Chroma Green 2" unmounted  ·  Chroma Luminance 2" unmounted

Accessory: ZWO M68 OAG  ·  ZWO EFW 2″X7  ·  Takahashi Flattener TOA-67  ·  Feathertouch Focuser Boss II Electronic Focusing Control


Dates:Jan. 3, 2021Jan. 4, 2021Jan. 7, 2021

Frames:
Chroma Blue 2" unmounted: 30x120" (1h) (gain: 0.00) -20C bin 1x1
Chroma Green 2" unmounted: 30x120" (1h) (gain: 0.00) -20C bin 1x1
Chroma Ha 3nm: 24x300" (2h) (gain: 100.00) -20C bin 1x1
Chroma Luminance 2" unmounted: 60x120" (2h) (gain: 0.00) -20C bin 1x1
Chroma Red 2" unmounted: 30x120" (1h) (gain: 0.00) -20C bin 1x1

Integration: 7h

Avg. Moon age: 20.85 days

Avg. Moon phase: 62.91%


Astrometry.net job: 4225485

RA center: 1h 4' 44"

DEC center: +2° 6' 57"

Pixel scale: 0.773 arcsec/pixel

Orientation: 0.669 degrees

Field radius: 0.802 degrees


Resolution: 6004x4441

Locations: Backyard (Mag 20.8 - Bortle 4.5), Onalaska, Texas, United States

Data source: Backyard

Description

This object, also known as Caldwell 51, is an irregular local dwarf galaxy located only 2.5 million light years away in the constellation of Cetus at a declination of +2 degrees. This unusual object is the most challenging object to see in the Caldwell catalog. It is a member of our Local Group, a collection of 50 galaxies that includes the Milky Way. This galaxy is about the same distance away from earth as the Andromeda Galaxy, but in a different direction. It is similar in structure to the Magellanic Clouds.

This magnitude 9.9 galaxy spans 13 arc-minutes in our apparent view, which corresponds to a diameter of only 10,000 light years. I find it interesting the this galaxy is in the top 20 largest galaxies in the sky in terms of apparent size to us, being almost half the size of our moon. Even more surprising, it is in the top 40 brightest galaxies in terms of magnitude.

This galaxy is unusual for a number of reasons - no disk, little dust, and some stars that appear to be able to be resolved, which is unusual for another galaxy. Ha regions, blue stars, orange stars, and bluish star clusters all are visible in the image.

Comments

Revisions

  • Final
    IC 1613, 



    
        

            Gary Imm
    Original
  • IC 1613, 



    
        

            Gary Imm
    B

B

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IC 1613, 



    
        

            Gary Imm