Hemisphere:  Northern  ·  Constellation: Hercules (Her)  ·  Contains:  Hercules Globular Cluster  ·  Hercules globular cluster  ·  IC4617  ·  M 13  ·  M13  ·  NGC 6205
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M13, 



    
        

            Rodd Dryfoos
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M13

Getting plate-solving status, please wait...
M13, 



    
        

            Rodd Dryfoos
Powered byPixInsight

M13

Imaging telescopes or lenses: Takahashi TOA 130 NFB TOA 130

Imaging cameras: ZWO ASI 1600mm cool pro ASI 1600

Mounts: Astro Physics AP Mach 1 GTO with GTOCP3

Filters: Astrodon True Balance E LRGB

Accessory: Starlight Xpress Lodestar X2  ·  Baader/Astro-Physics Vario Guider  ·  Takahashi 67 Flatner 67 Flatner


Frames:
Blue: 32x294" (2h 36' 48") (gain: 139.00) -20C bin 1x1
Green: 40x300" (3h 20') (gain: 138.96) -20C bin 1x1
Red: 97x300" (8h 5') (gain: 139.00) -24C bin 1x1

Integration: 14h 1' 48"

Darks: ~30

Flats: ~100

Flat darks: ~99

Bortle Dark-Sky Scale: 5.00

Temperature: 7.33


Astrometry.net job: 3739369

RA center: 16h 41' 44"

DEC center: +36° 25' 22"

Pixel scale: 0.781 arcsec/pixel

Orientation: 4.401 degrees

Field radius: 0.616 degrees


Resolution: 4545x3405

Data source: Backyard

Description

This is a LgRGB composition--an RGB image in which I used the green channel as a luminance. The green channel was collected during a rare spell of good seeing and was superior to the R and B. The FWHM was 1/2 the FWHM of the R and B. I did not know if this was going to work. I created a synthetic luminance out of the RGB, but used the green channel instead for its sharpness

TOA 130 with ASI 1600 and Astrodon Series E True balance filters
Red: 25 5 min
Green: 40 5 min
Blue: 32 5 min

Comments

Revisions

  • M13, 



    
        

            Rodd Dryfoos
    Original
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            Rodd Dryfoos
    BL
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            Rodd Dryfoos
    BT
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            Rodd Dryfoos
    BV
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            Rodd Dryfoos
    BZ
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            Rodd Dryfoos
    CA
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            Rodd Dryfoos
    CB
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            Rodd Dryfoos
    CC
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            Rodd Dryfoos
    CD
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            Rodd Dryfoos
    CE
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            Rodd Dryfoos
    CG
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            Rodd Dryfoos
    CH
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            Rodd Dryfoos
    CJ
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            Rodd Dryfoos
    CK
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            Rodd Dryfoos
    CL
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            Rodd Dryfoos
    CM
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            Rodd Dryfoos
    CN
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            Rodd Dryfoos
    CO
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            Rodd Dryfoos
    CP
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            Rodd Dryfoos
    CQ
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            Rodd Dryfoos
    CR
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            Rodd Dryfoos
    CS
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            Rodd Dryfoos
    CT
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            Rodd Dryfoos
    CU
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            Rodd Dryfoos
    CV
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            Rodd Dryfoos
    CW
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            Rodd Dryfoos
    CX
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            Rodd Dryfoos
    CY
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            Rodd Dryfoos
    CZ
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            Rodd Dryfoos
    DA
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            Rodd Dryfoos
    DB
  • Final
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            Rodd Dryfoos
    DC
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            Rodd Dryfoos
    DD

BL

Description: Blend-replace7a

Uploaded: ...

BT

Description: Image05e2

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BV

Description: Image05e3ds2

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BZ

Description: Image05h2

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CA

Description: Image05h3: final tweaks of core

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CB

Description: Image05h3bin--smaller for full scale viewing

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CC

Description: Blend3bin

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CD

Description: Image05h3bin alt--a bit less green in core

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CE

Description: Image05h3bin-alt2--a bit more color

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CG

Description: B

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CH

Description: LRGB-2: an LRGB composition

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CJ

Description: LRGB-4a

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CK

Description: LRGB-5

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CL

Description: LRGB-5a: Background is neutralized--thanks Niall!

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CM

Description: Image99: A blend of BP and CL

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CN

Description: Image-99a--a tiny bit of green reduction in disc

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CO

Description: Image99-d: Equalized background

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CP

Description: Image100a--a total reprocess with the true globular cluster palette in mind

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CQ

Description: Image100a3: Final tweaks

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CR

Description: Image116:touched up core

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CS

Description: Image100a3-2: No blend--straight reprocess. FINAL

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CT

Description: 100a32 and 99: The correct palette

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CU

Description: Blend 100a3-2 and 99-6: I was told that globulars are redder than they are white or blue

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CV

Description: Blend 100a-2-99-6

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CW

Description: Blend 100a3-2and99-7a: neutralized background

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CX

Description: Same--netter neatralization

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CY

Description: M13work--a very slight magenta reduction

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CZ

Description: Blend 100a3 and 99-8: Work on palette. Reducing magenta by lifing green.

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DA

Description: Work

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DB

Description: Final: getting ready for print

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DC

Description: Final2: tamed core ;little

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DD

Description: a bit of color

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Sky plot

Sky plot

Histogram

M13, 



    
        

            Rodd Dryfoos