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NGC 1499, the California Nebula, Ha [section], 


            Stephen Garretson
NGC 1499, the California Nebula, Ha [section]

NGC 1499, the California Nebula, Ha [section]

Technical card

Resolution: 2330x1735

Dates:Nov. 8, 2018Nov. 9, 2018

Baader 3.5nm Ha filter, 2": 5x180" (gain: 139.00) -20C bin 1x1
Baader 3.5nm Ha filter, 2": 35x180" (gain: 139.00) 15C bin 1x1

Integration: 2.0 hours

Darks: ~22

Flats: ~30

Flat darks: ~15

Bias: ~44

Avg. Moon age: 1.32 days

Avg. Moon phase: 2.23%

Bortle Dark-Sky Scale: 6.00 job: 2361359

RA center: 3h 59' 45"

DEC center: +36° 43' 22"

Pixel scale: 2.116 arcsec/pixel

Orientation: 267.804 degrees

Field radius: 0.854

Locations: Beevo Dome [home observatory], Louisville, CO, United States

Data source: Backyard


This section of NGC 1499 centers on the star GSC 2369, 2206. I find it so interesting how getting in closer on some nebulae exposes structure, and this target is part of that exploration. [Using a centering star allows me to easily return to the same FOV to add data in subsequent sessions, as well as to slew to a bright focusing star as needed and then slew back to exactly where I was.] At present I monitor the temperature, and when has changed more than about 0.4° I check the focus with my Bahtinov mask. Having grown accustomed to this routine, I can genrally perform this check/adjustment in under two minutes, so a pretty simple and effective method of staying in focus. A new temperature compensating focuser is soon to be added, but that's for a different scope [8" CFRC].

This is only 2 hours of Ha at 3.5nm; as the target has low surface brightness I want to gather additional Ha data. Also, it's on a list of posible/probable targets that contain H-beta data, so I will experiment with that filter. I had just started a run of H-beta on 9, Nov. when the clouds slammed the door shut on the it goes...I'll be back.



Stephen Garretson
License: None (All rights reserved)

Sky plot

Sky plot


NGC 1499, the California Nebula, Ha [section], 


            Stephen Garretson