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Contains:  California nebula, NGC 1499, The star ξPer
Getting plate-solving status, please wait...
NGC 1499, California Nebula, Hα, Animated GIF, 


            David Dearden
NGC 1499, California Nebula, Hα, Animated GIF

NGC 1499, California Nebula, Hα, Animated GIF

Technical card

Resolution: 1285x786

Dates:Nov. 3, 2014Nov. 4, 2014

Frames:Baader Planetarium Ha 7nm 1.25": 31x600" bin 1x1

Integration: 5.2 hours

Avg. Moon age: 11.60 days

Avg. Moon phase: 88.84% job: 405206

RA center: 60.287 degrees

DEC center: 36.407 degrees

Pixel scale: 6.591 arcsec/pixel

Orientation: -179.924 degrees

Field radius: 1.379 degrees

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States


The Moon is bright again so I'm returning to Hα imaging. I decided to try the switch to the ST80 scope "cold turkey": I just moved the finder/guider onto the ST80 and didn't even bother to take the Telrad sight off my AT8IN reflector. The plan was to rely on Astrotortilla to find the target. It didn't work at first, until I realized I was setting Astrotortilla to the field of view of the AT8IN, not the ST80. It's a little challenging with the Hα filter in place (because that cuts down the number of stars drastically), and to top it off, my Peltier cooler failed big time last night so the CCD temperature got up into the 40's before I realized something was wrong and there were numerous hot pixels masquerading as stars. Fortunately the weather has turned cold, so the CCD was down below 5 °C once I really got the session rolling. Eventually, I did get plate solving to work, though the California Nebula is quite easy to find from ε Per; the thing is HUGE! I shot 2 sections of a mosaic, but *!#*! Windows decided to shut itself down for updating in the middle of the second session. So much for staying up half the night to perform a meridian flip.

Date: 3-4 Nov, 2014
Subject: NGC 1499, California Nebula
Scope: Orion ST80 + Antares 0.5x telereducer
Filter: Baader Hα
Mount: CG-5 (Synta motors, PicGoto Simplificado)
Guiding: 9x50 Finder/Guider + DSI Ic + PHD 2.3.1k (Win 7 ASCOM)
Camera: DSI IIc no cooling
Acquisition: Nebulosity 3.2.1, no dither
Exposure: 22+9x600 s (2 panels)
Stacking: Neb 3, bad pixel map, bias included, flats, OSC extract R, normalize, square, trans+rot align, 1.5 SD stack resize 2x.
Processing: StarTools Crop; Develop 50%; HDR:Optimize; Life:Less=More; Deconvolute: 3.0 pix; Track 5.0 pix; Magic 1 pix. Photoshop CC 2014 + Carboni Astronomy Tools Layer mask align & combine; Levels to match backgrounds; Hα false color black background in one panel; Astroframe.



David Dearden
License: None (All rights reserved)

Sky plot

Sky plot


NGC 1499, California Nebula, Hα, Animated GIF, 


            David Dearden