Saturday, March 7, 2020
Simeis 147 (Sh2-240) with more light from oxygen, O-III
Simeis 147 is a difficult target due to a low surface brightness and a very large angular diameter.
I have published published a mapped color version of this supernova remnant. This time I have composed the narrowband channels to a visual palette. Ionized hydrogen, H-alpha emits deep red light. Since the hydrogen is the most common element in our universum, red is dominating the view.
I have collected now more exposures from light emitted by ionized oxygen, O-III. Now there are some blue hues from O-III light visible in the final image of supernova remnant Simeis 147.
previous version can be seen here, https://astroanarchy.blogspot.com/2020/02/simeis-147-sh2-240-large-supernova_22.html
Simeis 147 (Sharpless 240)
Click for a large image it's worth it!
Note, the relative size of a full Moon is marked as a white circle at bottom left, this is a large object!
Image is in natural color palette combined from narrowband channels, H-alpha, S-II and O-III.
An ionized hydrogen and sulfur are both emitting red light, an ionized oxygen emits blue/turquoise light. Red light from an ionized hydrogen is dominating the view.
An experimental starless version
Click for a large image
The starless version Complex filaments are easier to see in this experimental starless image.
Image is in natural color palette combined from narrowband channels, H-alpha, S-II and O-III.
An ionized hydrogen and sulfur are both emitting red light, an ionized oxygen emits blue/turquoise light. Red light from an ionized hydrogen is dominating the view.
An experimental starless version
Click for a large image
Simeis 147 (sharpless 240), is a very faint and large supernova remnant in constellation Taurus at distance of ~3000 light years. It's constantly expanding at speed of 1000 km/second but due the size of it, we can't see any movement in it. This SN spans over 160 light years and the apparent scale in the sky is about three degrees (Moon has an apparent size of 30" = 0,5 degrees). Explosion took place approximately 30.000 years ago and left behind a pulsar (Neutron star). The pulsar has recently identified.
How long it'll takes to this supernova remnant to expand 1% large when the diameter is 160 light years and it expands at speed of 1000km/second.
How long it'll takes to this supernova remnant to expand 1% large when the diameter is 160 light years and it expands at speed of 1000km/second.
Answer is ~480 years.
(1% of diameter 160/100= 16, as kilometers ~151.372.800.000.00, = Y, km,
1000km/second is ~315.360.000.00, = Z, kilometers/year.
So, X x Z = Y and X=Z/Y, X = 480 with given values)
(1% of diameter 160/100= 16, as kilometers ~151.372.800.000.00, = Y, km,
1000km/second is ~315.360.000.00, = Z, kilometers/year.
So, X x Z = Y and X=Z/Y, X = 480 with given values)
Technical details
Processing workflow
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 33 iterations, added at 50% weight
Color combine in PS CS3
Levels and curves in PS CS3.
Imaging optics
Mount
10-micron 1000
Cameras and filters
Imaging camera Apogee Alta U16 and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and an old spotting scope of Meade LX200
Astrodon filters,
5nm H-alpha 3nm S-II and 3nm O-III
Total exposure time
H-alpha, 15 x 1200 s, binned 1x1 = 5 h
O-III, 48x 600 s, binned 2x2 = 8 h
S-II, 1 x 12 x 600 s. binned 2x2 = 2 h
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