Three Fathoms Observatory
Stewart Yeung

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Front Page         

Recent Astrophotos :

 

March 2017

 

 

The Great Orion Nebula (M42)

 


 
Exposure : taken on 2 March 2017
Image Scale : 0.82"/Pixel
FOV : 62’x50’

Improvements Over Previous Images:
1. Focal reducer given up to restore original better image quality
2. Separate and sharper foci for Luminous, Red, Green and Blue subframes

 

 

 

 

January 2017

 The Horsehead Nebula & the Flame Nebula


Exposure : taken in six nights from 17 Nov 2016 to 4 Jan 2017
Luminance : 13x5min ;

R= 16x5 min = 80min
G= 10x5 min = 50min
B = 12x5 min = 60min


Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

 

December 2016

 The Triangulum Galaxy (M33)



False colors : LRGB = (L+Hα ), (R+Hα ), G, B
Exposure : taken in six nights from 28 Nov to 16 Dec 2016
Luminance : 25x5min ; RGB :22x5min each ; Hα : 20x5min
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

November 2016

 

 

The Great Orion Nebula (M42)

 


Composition of two M42 astrophotos shot at different scale at different time

Small Scale Whole view of M42 : 
Exposure : taken on 4 November 2016
Image Scale : 0.91"/Pixel
FOV : 68’x55’

Large Scale Central part of M42 :
Exposure : taken in December 2013 
Image Scale : 0.38"/ Pixel
FOV : 14' x 9.5 '

 

 


Exposure : taken on 4 November 2016 with 150mm Refractor
Luminous : 1 minute x 16 = 16 Minutes
Red = 1 Minute x 13 = 13 Minutes; Green =  1 Minute x 13 = 13 Minutes; Blue : 1Minute x 7 = 7 Minutes
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

 

 The Andromeda Galaxy (M31)



Exposure : taken on 3 -5 November 2016 with 150mm Refractor
Luminous images : 3min x11 = 33 min 
Red/Green/Blue : 3min x10 = 30 min each
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

 

 

The Double Cluster (Open star clusters NGC 869 and NGC 884 )



Exposure : taken on 5 November 2016 with 150mm Refractor
Luminous/Red/Green/Blue : 3min x5 = 15min each
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

The 7th November Waxing Gibbous Moon

Exposure with 150mm Refractor

Ha : 0.001sec x 1
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

 

 

 

September 2016

 

The Sun @ 5:03 p.m. on 26 September 2016

Exposure with 150mm Refractor

Ha : 0.001sec x 1
Image Scale : 0.91"/Pixel
FOV : 68’x55’

 

 

 

 

 

 

June 2016 : The Planetary Season

 

 

Jupiter shot on 27 June 2016 at around 7:49pm HK time
Meade 14" LX200R & QHY174-Cool Planetary Camera
Reprocessed with Registax6 & Photoshop CS6

 

 

Saturn shot on 25 June 2016 at around 11pm HK time
Meade 14" LX200R & QHY174-Cool Planetary Camera
Reprocessed with Registax6 & Photoshop CS6

 

 

 

Mars shot on 26 June 2016 at around 10:30pm HK time
Meade 14" LX200R & QHY174-Cool Planetary Camera
Reprocessed with Registax6 & Photoshop CS6

 

 

 

November 2015

 

 

NGC 891 (Caldwell 23)



Exposure : taken on several night at the end of November 2015

Luminous Frames : 95x3 = 285 min
Red/Green/Blue Frames (2x2 binned) : about 35x2 = 70 min for each color
Image Scale : 0.57"/Pixel
FOV : 21’x14’

 

Color Version

 

B/W Version

 

 

 

 

 

Helix Nebula (NGC 7293)

Exposure : taken in late Oct to Early November 2015
Raw images : Luminous : 19x3 = 57 min
Ha (matched to Red): 24x3 = 72 min
Green : 10x3 = 30min
Blue : 12x3 = 36min
Image Scale : 0.57"/Pixel
FOV : 21’x14’

 

 

September 2015

 

The Silver Coin Galaxy (Caldwell 65)


Exposure : taken on 24 Septerber 2015
Raw images : 20x1 = 20 min
Red/Green/Blue : 10x1 = 10min each
Image Scale : 0.57"/Pixel
FOV : 21’x14’

 

 

 

 

March 2015


ASTROPHOTO OF M81

Exposure : taken on 28 March 2015

Image Scale : 0.56"/Pixel
FOV : 14’x18’ (cropped)


B/W image, without IR blocking filter

Raw images : Luminance 42x3 = 126 minutes

 

 

 

Color Image

Raw images : Luminance 42x3 = 126 minutes
: Red/Green/Blue = @ 10 x 2 = 20 Minutes

 

 

 

January 2014

Clownface/Eskimo Nebula

L : 144 x 1min ; RGB : 5 x 2min @

Image Scale : 0.38"/Pixel
FOV : 7' x 7' (Cropped)

 

 

 

The Moon

 

 

December 2013

Stephan's Quintet

B/W image, without IR blocking filter
Exposure : 188 x 3min

Image Scale : 0.38"/Pixel
FOV : 10’x 7’(Cropped)

 

Stephan's Quintet (Cropped)

Color Image

Exposure : L: 188 x 3min

RGB : 35x5min; 31x5min; 21x5min

Image Scale : 0.38"/Pixel
FOV : 10’x 7’(Cropped)

 

 

M42 The Orion Nebula Stellar Nursery

Exposure : L: 22 x 1sec

RGB : 14x1sec; 12x1sec; 12x1sec

Image Scale : 0.38"/Pixel
FOV : 14’x 9.5’

 

 

November 2013

Comet ISON (C/2012 S1)

B/W image, without IR blocking filter
Exposure : 10x1min , taken around 21:15 a.m. to 22:00 a.m. on 16 Nov 2013, UTC

Image Scale : 0.38"/Pixel
FOV : 9.5’x14.0’

 

M22 (Reprocessed)


Exposure : L captured at 1x1 @10min ; RGB captured at 2x2 @10min ;
Image Scale : 0.35"/Pixel

 

 

 

 

August 2013

M16

B/W image, without IR blocking filter
Exposure : taken in three nights
Raw images : 41x3min , each deconvoluted before combining to a master median image
Image Scale : 0.6"/Pixel
FOV : 14.8’x21.9’

 

 

 

 

M51

B/W image, without IR blocking filter
Exposure : taken in three nights
Raw images : 37x3min , each deconvoluted before combining to a master median image
Image Scale : 0.6"/Pixel
FOV : 14.8’x21.9’

 

 

M51

Color image by combining the preceding B/W image with color image of lower resolutioin

 

 

 

 

M101

B/W image, without IR blocking filter
Exposure : taken in three nights
Raw images : 36x3min , each deconvoluted before combining to a master median image
Image Scale : 0.6"/Pixel
FOV : 14.8’x21.9’

 

 

July 2013

 

M13

B/W image, without IR blocking filter
Exposure : taken in a single night
Raw images : 11x3min , each deconvoluted before combining to a master median image
Image Scale : 0.6"/Pixel

FOV : 14.8’x21.9’

 

 

January 2013

 

M1, Crab Nebula

False colors : LRGB = (L+Ha), (R+Ha), G, B
LRGB : 9x10min each ; Hα : 6x10min
Image Scale : 0.5"/Pixel
FOV : 19.5' x 13.1'

Images reduced in CCDSoft and Processed in CCDStack I

Further Processed in Photoshop CS4 , with the HLVG plug-in

 

 

 

 

M33, Triangulum Galaxy

False colors : LRGB = (L+Ha), (R+Ha), G, B
Luminance : 10x10min ; RGB :11x10min each ; Hα : 10x10min
Image Scale : 0.5"/Pixel
FOV : 19.5' x 13.1'

Images reduced in CCDSoft and Processed in CCDStack I

Further Processed in Photoshop CS4 , with the HLVG plug-in

 

 

 

December 2011

Stephan's Quintet - L/R/G/B captured unbinned : 8x15:9x15:7x15:6x15 Minutes

Images reduced in CCDSoft and Processed in CCDStack I

Contrasted in Photoshop CS4

 

 

Stephan's Quintet - Through only the Red Filter : 9x15min

Images reduced in CCDSoft and Processed in CCDStack I

Contrasted in Photoshop CS4

 

November 2011

Stephan's Quintet - L/R/G/B captured unbinned : 3x15:3x15:4x15:4x15 Minutes

Images reduced in CCDSoft and Processed in CCDStack I

Contrasted in Photoshop CS4

 

 

August 2011

M27 - Ha/OIII/Blue captured unbinned : 3x15:2x15:2x15 Minutes

Images reduced in CCDSoft and data-rejected/deconvoluted in CCDStack I

False color image contrasted and slightly blurred in Photoshop CS4

 

Bubble Nebula Processed in CCDStack I; L Frame Deconvolved; Exposure offset,contrasted and blurred in Potoshop CS4

L captured at 1x1 3x5 min ; R at 2x5 min ; G at 3x5 min; B at 4x5 min; Gen II AstroDon Color Filters

 

 

M57 - Ha/OIII/SII captured unbinned : 20:20:20 Minutes

Individual frames reduced in CCDSoft and deconvoluted in CCDStack I

R/G/B CFHT false color image contrasted and sharpened in Photoshop CS4

Same M22 color image with Deconvolved L frame :

 

 

M22 Processed in CCDStack I; no Deconvolution; sharpened and contrasted in Potoshop CS4

L captured at 1x1 @10min ; RGB captured at 2x2 @10min ;Gen II AstroDon Color Filters

 

July 2011

M16 - Ha/OIII/SII captured unbinned : 15:15:15 Minutes

Individual frames reduced in CCDSoft and deconvoluted in CCDStack I

False Color image (Canada France Hawaii Team : Ha=Red, OIII=Green, SII=Blue) further processed in Photoshop CS4

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June 2011

M104 Processed in CCDStack I

L captured at 1x1 @10min ; RGB captured at 2x2 @10min

Gen II AstroDon Color Filters

 

 

M51 showing the Supernova SN2011dh

Processed in CCDStack I

L captured at 1x1 : 37x3min ; RGB captured at 2x2 @10min

Gen II AstroDon Color Filters

 

February 2011

Eskimo Nebula Processed in CCDStack I

L captured at 1x1 @10min x3 ; RGB captured at 2x2 @10min x2

Cropped in Photoshop to hide light gradient probably due to defective Astrodon Color Filters

 

 

 

January 2011

Silver Dollar : the Sculptor Galaxy processed in CCDStack I and PS CS4

Image dimmed to suppressed the uneven light/color pattern

L captured at 1x1 @6min; RGB captured 2x2 @6min

 

 

M76 Processed in CCDStack I

L captured at 1x1 @6min; RGB captured 2x2 @6min

CCDStack's "flatten background" used to suppressed the uneven light/color pattern

 

 

October 2010

M27 - LRGB : 6:6:3:3 Minutes

Individual frames reduced and Richerson-Lucy deconvoluted in CCDSoft

Final image combined and further processed in Photoshop CS4

M27  L/R/G/B : 6/6/3/3 minutes@

 

 

 

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M16 - HaOIIISII: 20:20:20 Minutes

Individual frames reduced and Richerson-Lucy deconvoluted in CCDSoft

Final image combined and further processed in Photoshop CS4

 

 

M16 Reprocessed in MaxIm DL and PS CS4

 

 

October 2008

M1-Ha:20min LRGB: @ 8min

Composite of (L+Ha)+(R+Ha)+G+B

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Astrophotos Archive

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Native F/10 photos

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M22

M15

M27

M57

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                                                                     Download original TIFF files of  M22 M15M27 and M57 .                       

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F/5.8 photos with Lumicon LG1080 Focal Reducer

M81

M101

M82

NGC_7331

M27

M33

M16 : PILLARS OF CREATION

M16

Download original TIFF files of  M81 M101 M82 NGC_7331M27 M33 M16 Pillars of Creation M16.

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Black & White F/5.8 photos with Lumicon LG1080 Focal Reducer

M51

M13

M16

M94

Download original TIFF files of   M51 M13 M16, and M94.

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ToUcam photos

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Technical Photos   

Master dark-frame 30min

Master dark-frame 5min

Original Light-polluted M81

Light-pollution supressed M81

RGB before Alignment M27

RGB after Alignment M27

Master Flat-field for F/5.8 system

Master Flat-field for Native F/10 system

Photoshop-corrected light-polluted M101

Original Light-polluted M101

Iris-corrected light-polluted M101

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Download original TIFF files of Master Master Dark 30min,  , Master flat F/5.8 F/10 , PS corrected M101  and Iris-corrected M101.

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Professional Astrophotos 

(under preparation) 

 

 

 

 

 

 

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