Thursday, November 22, 2012
Exhibition, Gallery Kallio Kunsthalle, Helsinki
Three of my works can be seen in an "Energy" exhibition, in a small art gallery, Kallio Kunsthalle, at Helsinki.
Exhibition opening 2.11.2012 klo 18:00-21:00.
2.11.-2.12.2012 (Toinen Linja 31, Kallio, Helsinki)
Images about the exhibition
Images by Petri Saarikko
Three large photographs of mine at left. Images from left to right,
IC 1396, Pelican nebula closeup and the constellation Cygnus.
IC 1396, Pelican nebula closeup and the constellation Cygnus.
At background, closeup images of the Pelican nebula and the IC 1396.
Tuesday, November 20, 2012
Veil Nebula collection as a poster
I started this Autumn season by shooting the Veil Nebula Supernova remnant. The Veil Nebula is very large and low surface brightness object in the constellation Cygnus, at distance of about 1400 light years.
Even though I used every single clear moment, all I got is three separate images. I was planning to shoot couple of two panel mosaics but the weather up here was very much against my plans.
Veil nebula collection, HST-palette
Large image, 1900x1500 pixels and 3MB
Large image, 1900x1500 pixels and 3MB
Image collection in HST-palette (Named after a palette used by the Hubble Space Telescope.)
Ionized elements are mapped to color channels, Red =Sulfur, Green=Hydrogen and Blue=Oxygen.
Veil nebula collection, visual colors
Large image, 1900x1500 pixels and 3MB
Image collection in visual spectrum. Ionized elements are mapped to match visual light, Red=(Hydrogen + Sulfur 20%), Green =Oxygen and Blue=(Oxygen + Hydrogen 15% to compensate missing H-beta light)
At bottom middle, a wide field image of the Veil nebula SNR. There are white rectangles to mark locations of the closeup images around and image is labeled.
Note. the apparent size of the Moon is marked as a circle in a wide field image at the bottom center.
Note. the apparent size of the Moon is marked as a circle in a wide field image at the bottom center.
Images used for this collection
- At upper left, IC 1340 with Meade LX200 12": http://astroanarchy.blogspot.fi/2012/10/ic-1340-project-finalized.html
- Upper right, the Pickering's Triangle with Meade LX200 12": http://www.astroanarchy.blogspot.fi/2012/11/pickerings-triangle-project-finalized.html
- Bottom left, Eastern part of the veil. Shot at 2007 with 80mm refractor.
- Bottom middle, the veil nebula wide field with a Tokina AT-X 300mm f2.8 camera lens: http://astroanarchy.blogspot.fi/2012/03/veil-nebula-reprocessed-with-some-new.html
- Bottom right, the Witch's Broom with Meade LX200 12": http://astroanarchy.blogspot.fi/2012/11/witchs-broom-nebula.html
A 3D-experiment and a study about the scale in the sky
Saturday, November 17, 2012
Witch's Broom Nebula
Filaments in the Western Veil
Supernova remnant in Cygnus
Image is in visual spectrum, composed from H-a and O-III narrowband channels.
This is a third detail image from the Veil Nebula supernova remnant from this Autumn season.
Two others can be seen here, IC 1340 in Eastern Veil and the Pickering's Triangle.
The Veil Nebula locates in constellation Cygnus at distance of about 1400 light years. The angular size of the image is close to size of the full Moon. The bright star at upper right corner is 52 Cygni, it's a foreground star and unrelated to the supernova remnant.
Orientation
Area of interest is marked as a white rectangle.
Image in HST-palette
19.11.2012
I made a HST-palette version out of this. I have shot the Veil Nebula with much wider field instruments, Tokina AT-X 300 f2.8 and the Canon EF 200mm f1.8 cameraoptics. I took the color information from the wide field image and used it with this detail image. Here is the result.
Colors for this HST-palette image are borrowed from a wider field one, image can be seen here:
http://astroanarchy.blogspot.fi/2012/03/veil-nebula-reprocessed-with-some-new.html
19.11.2012
http://astroanarchy.blogspot.fi/2012/03/veil-nebula-reprocessed-with-some-new.html
An animated image shows the difference between ionized Oxygen and Hydrogen
Click for a large image
Technical details:
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Levels, curves and color combine in PS CS3.
Optics, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO, an active optics unit, and Lodestar guide camera 8Hz
Image Scale, ~0,8 arc-seconds/pixel
15 x 1200s exposures for the H-alpha, emission of ionized Hydrogen = 5h
6 x 1200s exposures for the O-III, emission of ionized Oxygen = 2h
4 x 1200s exposures for the S-II, emission of ionized Sulfur = 1h 20min.
Friday, November 16, 2012
Astro Anarchy gets published
Winner image of the Cloudy Nights forum Imaging/Sketching Contest
October 2012
IC 1340, Part of the Eastern Veil Nebula in Cygnus
RA: 20h56m 45.8s DE:+31 degrees07' 17"
Original blog post about this image, with more images and technical details:
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