Michael A. Stecker
mastecker@gmail.com



 
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Shark Nebula (LDN 1235) in Cepheus
shot with Askar 103 APO refractor at f/4
 The Shark Nebula is a dark-dusty nebula 650 light-years from Earth in the constellation Cepheus.  Its dark portion is LDN 1235 (Lynds Catalog of Dark Nebulae n° 1235). There are also two adjacent blue reflection nebulae: van den Bergh (vdB) 149 &150 and a small distant yellow-colored galaxy PGC67671 on the right.
This is a joint project of James Foster and Michael A. Stecker.
file: SharkAskarF4-450minColEND16July24A_HA198min&LUM59minFIN-aadh1sm.jpg 
 click here for enlargement

Photographic Data
 Date:
June 16-24, 2024

 telescope:
Askar 103 APO triplet refractor focally reduced by 0.6X
Apereture: 103 mm
Focal Ratio (reduced): f/4
FL= 412 mm
 cropped photo
 
mount:
Astro-Physics 1200GTO

guiding:
SVBony 60 mm guidescope (FL= 240 mm)
Guide Camera: ZWO ASI120MM Mini

imaging cameras:
ZWO ASI6200MC-Pro (one-shot color)
cropped image

exposure:
450minCol, HA198min & LUM59min

processing
Maxim-DL, ASI Studio and Adobe Photoshop Elements

photographic site:
Pinon Pines Estates (Frazier Park California)
(Bortle 4 at 5,500 ft elevation)
 
 

Crop of image above
Shark Nebula (LDN 1235) in Cepheus
shot with Askar 103 APO refractor at f/4
file: SharkAskarF4-450minColEND16July24A_HA198min&LUM59minFIN-aa-crhr2asm.jpg
 click here for enlargement
 
 
 
 


Shark Nebula (LDN 1235) in Cepheus
shot with higher resolution Sky-Watcher Quattro 250P
(10-inch f/4 Newtonian telescope)
 The Shark Nebula is a dark-dusty nebula 650 light-years from Earth in the constellation Cepheus.  Its dark portion is LDN 1235 (Lynds Catalog of Dark Nebulae n° 1235). There are also two adjacent blue reflection nebulae: van den Bergh (vdB) 149 &150 and a small distant yellow-colored galaxy PGC67671 on the right.
This is a joint project of James Foster and Michael A. Stecker.
file: Shark840min_GKriging-1smooth4_stretched_GXd8bet-2x1asm.jpg
 click here for full resolution image

Photographic Data
 Date:
June 16-24, 2024

 telescope:
Sky-Watcher Quattro 250P
(10-inch f/4 Newtonian telescope with coma corrector)
FL= 1,000 mm
 cropped photo
 
mount:
Astro-Physics 1200GTO

guiding:
Off-axis, ZWO ASI120MM mini guide camera
imaging cameras:
ZWO ASI6200MC-Pro (one-shot color)
cropped image

exposure:
840 minutes (14-hrs)

processing
Maxim-DL, ASI Studio and Adobe Photoshop Elements

photographic site:
Pinon Pines Estates (Frazier Park California)
(Bortle 4 at 5,500 ft elevation)