Emission Nebula in constellation “Monoceros”
Project #10
NGC2239 – Object Description
The Rosette Nebula (also known as Caldwell 49) is a H II region located near one end of a giant molecular cloud in the Monoceros region of the Milky Way Galaxy. The open cluster NGC 2244 (Caldwell 50) is closely associated with the nebulosity, the stars of the cluster having been formed from the nebula’s matter. We have a distance of roughly 5.200 lightyears between Earth and this object. (Source: Wikipedia)
NGC2239 – Project Publications
Image Publications
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Image and Signal Comparisons
OIIIIn astronomy, doubly ionized oxygen is the ion O2+ (O III in spectroscopic notation). Its emission forbidden lines in the visible spectrum fall primarily at the wavelength 500.7 nm, and secondarily at 495.9 nm. Concentrated levels of O III are found in diffuse and planetary nebulae. Consequently, narrow band-pass filters that isolate the 500.7 nm and 495.9 nm wavelengths of light, that correspond to green-turquoise-cyan spectral colors, are useful in observing these objects, causing them to appear at higher contrast against the filtered and consequently blacker background of space (and possibly light-polluted terrestrial atmosphere) where the frequencies of [O III] are much less pronounced. (Source: Wikipedia) More vs. HalphaH-alpha (Hα) is a deep-red visible spectral line of the hydrogen atom with a wavelength of 656.28 nm in air and 656.46 nm in vacuum. It is the first spectral line in the Balmer series and is emitted when an electron falls from a hydrogen atom's third- to second-lowest energy level. H-alpha has applications in astronomy where its emission can be observed from emission nebulae and from features in the Sun's atmosphere, including solar prominences and the chromosphere. (Source: Wikipedia) More signal;
NGC2239 – Project Details
Please find all project-related details for this revision below.
There is a first revision for NGC2239.
| Astrobin Link | NGC2239 / Rosette Nebula (Rev.2) with OSC+Dual Narrowband (HO) |
| Astronomical Object | NGC2239 / Caldwell 49 |
| Distance to Earth | 5.200 light years |
| Size / Diameter | 130 light years |
| Date(s) of Photography | December 2022 |
| Exposure Details | Clearglass: 64 x 300″ (5h 20min) Dual NB: 57 x 300″ (4h 45min) Total: 10h 5min |
| Calibration | FlatsA "flat frame" is shot against a bright surface and contains vignetting and all the "bad" things (e.g. dust particles) that block/disturb your light train. The combination/stack of multiple flat frames is called a "Master Flat". More: 50 BIAS: 50 Master-Dark |
| Equipment | Mount: Skywatcher EQ6-R PRO (the old w/o USB-interface) Telescope: Skywatcher 200PDS Newton (200mm/1000mm, f/5) Camera: Touptek DeepSky Pro 2600c (Gain: 100, Offset: 100) Clearglass Filter: Baader Clearglass 2″ Dual Narrowband Filter: Optolong L-eXtreme 2″ Corrector: Pál Gyulai GPU Komakorrektor Guiding(Auto-)Guiding is essential in astrophotography, as an un-guided mount/telescope will produce blurry images as the stars / the deepsky object will drift away. This is heavily dependent on the exposure time, so for long exposures you want to make sure to have a perfectly set up auto-guiding. More: ZWO ASI120MM + 50mm Helical GuideScope |
| Software | Observatory Automation: Sequence Generator Pro Guiding(Auto-)Guiding is essential in astrophotography, as an un-guided mount/telescope will produce blurry images as the stars / the deepsky object will drift away. This is heavily dependent on the exposure time, so for long exposures you want to make sure to have a perfectly set up auto-guiding. More: PHD Post-Processing: Astro Pixel Processor + PixInsight + Photoshop |
