Sunday, June 12, 2011
NGC 1499, the "California Nebula", reprocessed
Since my processing technique gets better and we don't have any astronomical darkness until mid September, I have reprocessed some older images. There is now better star colors and other processing is tweaked too.
NGC1499, the "California Nebula"
RA 04h 03m 18.00s Dec +36° 25′ 18.0"
Click for large images
NGC 1499, the "California Nebula" locates in constellation Perseus. Distance is about 1000 light years.
The nebula covers about 2,5 degrees of sky.
HST-palette composition from emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen.
Narrowband data was used for Star colors, mixture of channels was the same as in "natural" color composition image below.
To see the size of this object (the apparent angular scale) in a sky, I have made some image series to demonstrate it. Please, have a look HERE.
Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
All the exposures, I have taken for this object, are used. Total exposure time is now about 20h together.
Two camera lenses was used to capture the data, a Tokina AT 300mm f2.8 and a Canon EF 200mm f1.8, both lenses was used at full aperture. Baader narrowband filter set was used, H-alpha, O-III and S-II
QHY8, cooled astronomical camera, was used with Tokina lens and a newer QHY9 with a Canon lens.
The original versions with imaging data:
and
As an addition, there is a longer focal length closeup image of NGC1499 used to boost details in mid section of the wide field image. Original post and details here: http://astroanarchy.blogspot.com/2010/12/ngc-1499-california-nebula-closeup.html
A natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
Technical details for the detail
Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9 Guiding, SXV-AO @ 4,5Hz
Image Scale, 0,75 arcseconds/pixel
Baader H-alpha 7nm 27x1200s, binned 2x2 = 9h
Butterfly Nebula, apparent scale in the sky
I have shot many targets with several focal lengths.
Due that, I will publish some images as an image sets, with different field of view and detail levels.
The fractal nature of our universe stands out nicely by this way and it will make the orientation more easy.
Many times, it's difficult to understand the image scale of astronomical images.
Due that, I will add a Moon circle in some of the images to show the angular scale in a sky.
The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.
The "Butterfly Nebula"
In constellation Cygnus
Images are in HST-palette, (HST=Hubble Space Telescope) from the emission of ionized elements, R=Sulfur, G=Hydrogen and B=Oxygen. Star colors are mixed from the NB channels, Red=H-a, G=O-III and B= 85%O-III + 15%H-a.
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.
Images used in the series above
First image is a three panel mosaic of the "Cygnus Trio"
Second one is two panels from a mosaic.
Third is a one panel
fourth is a zoomed crob from the above image.
The mosaic wide field was shot with a Tokina AT-X 300mm f2.8 camera lens with a QHY8 astro camera and a Baader narrowband filter set
All images in this page have been part of an older mosaic, the "Cygnus Trio"
It was my very first APOD (Astronomy Picture Of Day) published by NASA.
http://astroanarchy.blogspot.com/2008/11/apod.html
It was my very first APOD (Astronomy Picture Of Day) published by NASA.
http://astroanarchy.blogspot.com/2008/11/apod.html
Saturday, June 11, 2011
Tulip Nebula, Sh2-101, apparent scale in the sky
I have shot many targets with several focal lengths.
Due that, I will publish some older images as an image sets, with different field of view and detail levels.
The fractal nature of our universe stands out nicely by this way and it will make the orientation more easy.
Many times, it's difficult to understand the image scale of astronomical images.
Due that, I will add a Moon circle in some of the images to show the angular scale in a sky.
The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.
Sharpless 101, the "Tulip Nebula"
In constellation Cygnus
This is a second version, this time in "natural" colors from the emission lines.
First version in HST-palette can be seen here:
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.
Natural color composition from the emission of ionized elements, R=80%Hydrogen+20%Sulfur, G=100%Oxygen and B=85%Oxygen+15%Hydrogen to compensate otherwise missing H-beta emission. This composition is very close to a visual spectrum.
Images used in the series above
First image is a three panel mosaic of the "Cygnus Trio"
Second one is two panels from a mosaic.
The mosaic wide field was shot with a Tokina AT-X 300mm f2.8 camera lens.
A closeup image, at the bottom, is shot with a Meade LX200 GPS 12" reduced under 2000mm.
Baader narrowband filter set was used with both images, wide field was shot with a QHY8 and closeup with QHY9 cooled astronomical cameras.
Original images with technical details can be found here:
http://astroanarchy.blogspot.com/2011/01/tulip-nebula-sh2-101-wide-field-closeup.html
The mosaic:
http://astroanarchy.blogspot.com/2008/11/apod.html
The mosaic:
http://astroanarchy.blogspot.com/2008/11/apod.html
Thursday, June 9, 2011
California Nebula, NGC 1499, apparent scale in a sky
I have shot many targets with several focal lengths.
Due that, I will publish some older images as an image sets, with different field of view and detail levels.
The fractal nature of our universe stands out nicely by this way and it will make the orientation more easy.
Many times, it's difficult to understand the image scale of astronomical images.
Due that, I will add a Moon circle in some of the images to show the angular scale in a sky.
The full Moon has an angular size of ~30 arc minutes, that's equal to ~0,5 degrees.
California Nebula, NGC 1499, a zoom in series
In constellation Perseus
G=Hydrogen and B=Oxygen.
NOTE. The size of the full Moon (0,5 degrees) is marked as a gray circle in all of the images.
This is a second version, the first version in natural colors can be seen here:
Images from top to bottom
1. Image from 2008, Canon FD 200mm f2.8 camera lens, QHY8 astronomical camera
2. Tokina AT-X 300mm f2.8 camera lens, QHY9 astro camera and a Baader NB-filter set
3. A closeup with the Meade LX200 GPS 12" ~2000mm, QHY9 and a Baader NB-filter set
Original images and technical details
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