On this page a 21°×40° wide-field view of the Milky Way in the constellations Monoceros, Orion and Gemini is presented.
That part of the sky is full of HII regions, but there are only a few reflection nebulae.
Some (probably not all) of these unexplored nebulae have been collected in the list below. Click on the following links for a presentation.
Objects that are not cataloged by now and objects the are related to them (the list does not contain objects that are only minor extensions of known structures):
HII region, labelled F1, which contains the Seagull Nebula (at least the body) and various other emission Nebula, at least SH2-295 to SH2-297.
That region is ionized by the CMa OB1 association and it lies in a distance of about 1000pc (=3261 light years).
It is unclear whether IC 2177 (the head of the seagull) and SH2-293 belong to that nebula complex, because there are no usable parallax measurements for the ionizing stars.
SH2-289 (Thor's Helmet) is about 5 times as far away as the nebula complex F1 and therefore does not belong to it.
Click on the link above to load a presentation with sources that can be used for distance measurement. Outlines of known nebulae can be plotted by pressing the '3' key of via the menu.
False color images containing H-alpha and continuum:
H-alpha is mapped to red, blue continuum is mapped to green, and red continuum (without H-alpha) is mapped to blue.
Color of molecular clouds and reflection nebulae in the false color image is something between green (bluish in reality) and blue (reddish in reality).
HII regions (ionized hydrogen) appear red to orange, depending on the amount of OIII (doubly ionized oxygen) detected by the blue continuum filter.
A repository with the discoveries can also be found on GitHub
Images where captured with a camera array which is described on the instruments page.
Image data are:
RA: 6h46, DEC: 5°
North is up (exactly)
10 arcsec/pixel (in center at maximum resolution)
30°×28° (RA×DEC, through center)
Sum of exposure times of all frames used to calculate the image.
All image processing steps are deterministic, i.e. there was no manual retouching or any other kind of non-reproducible adjustment. The software which was used can be downloaded here.
Image processing steps where:
Bias correction, dark current subtraction, flatfield correction
Alignment and brightness calibration using stars from reference image
Stacking with masking unlikely values and background correction
Denoising and deconvolution both components (stars and residual)
RGB-composition (same factor for stars and residual for the true color composite)
Dynamic range compression using non-linear high-pass filter