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Contains:  M 4, M4, NGC 6121
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M4, 



    
        

            Gary Imm
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M4

Technical card

Imaging telescopes or lenses:Orion EON 130mm ED Triplet APO

Imaging cameras:ZWO ASI1600MM-Cool

Mounts:Astro-Physics Mach1GTO

Guiding telescopes or lenses:Orion 60mm Guidescope

Guiding cameras:Orion StarShoot AutoGuider Pro Mono

Focal reducers:Orion 3" Field Flattener

Software:Main Sequence Software Sequence Generator Pro PHD2PixInsight 1.8

Filters:RedGreenBlue

Accessory:ZWO EFW


Dates:July 1, 2017

Frames:
Blue: 20x30" (gain: 139.00) -15C bin 1x1
Green: 20x30" (gain: 139.00) -15C bin 1x1
Red: 20x30" (gain: 139.00) -15C bin 1x1

Integration: 0.5 hours

Avg. Moon age: 7.83 days

Avg. Moon phase: 54.72%


Astrometry.net job: 1641380

RA center: 16h 23' 36"

DEC center: -26° 31' 31"

Pixel scale: 0.851 arcsec/pixel

Orientation: -79.756 degrees

Field radius: 0.503 degrees


Resolution: 3712x2088

Locations: Backyard (Mag 20.8 - New Moon), Onalaska, Texas, United States

Data source: Backyard

Description

This object is one of the most open, or loosely constructed, of all globular star clusters. At a distance of about 7,200 light-years from Earth, M4 is also one of the closest Messier Objects to Earth. Note the contrast of hot (bluish) and cool (reddish) stars surrounding the core. You can easily see a bar structure horizontally across its central core region, consisting of 11th magnitude stars. Messier 4 has roughly the same apparent size as our full moon and is visible to the naked eye, but only in exceptionally good conditions. This object is relatively small for a globular cluster and contains about 20,000 stars, which is far fewer than the largest globular clusters which can contain up to 500,000 stars.

Comments

Author

GaryI
Gary Imm
License: None (All rights reserved)
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M4, 



    
        

            Gary Imm

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