Starship Asterisk*

Bugwriter wrote:The supernova remnant is 40,000 years old and light from it first reached earth 40,000 years ago? I would think every astronomer on the planet would be studying that object. ;-)

ritwik wrote:
supernova : they are the beautiful reminder that nothing last forever

http://dotsub.com/view/9063c8e8-e2f7-43 ... 3bbb204890

Jim Kinnaird wrote:
If the supernova happened 40,000 years ago and light takes 3,000 years to get from there to here, we're seeing what the remnant looked like after 37,000 years of evolution.

starsurfer wrote:
Spectacular image of what is surely a very faint supernova remnant! As well as Ha, it also contains a lot of OIII emission and there are very few images that include exposures in this waveband.

http://blog.deepskycolors.com/archive/2011/12/08/simeis-147-and-surroundings.html wrote:
<<Successfully combining narrowband data (H-Alpha in this case) and (L)RGB data can be tricky. One of the usual results is that, since H-Alpha data tends to produce very small stars, when combined with broadband data, the resulting image often presents a rather severe ringing around the stars. Also, some conventional techniques rely on mixing H-Alpha with the red (R) and blue (B) data, but in this case, my RGB data was rather poor so I couldn't rely on just this technique. Therefore, for this particular image I followed a number of conventional as well as non-conventional methods that proved to be rather successful in producing an image that visually documents this area of the sky. Also, as usual in many of my recent images, a multi-scale approach dominated post-processing, in particular to bring out the fainter details that hide behind the swarm of stars.>>

http://apod.nasa.gov/apod/ap050324.html wrote:
<<It's easy to get lost following the intricate filaments in this detailed image of faint supernova remnant Simeis 147. Seen towards the constellation Taurus it covers nearly 3 degrees (6 full moons) on the sky corresponding to a width of 150 light-years at the stellar debris cloud's estimated distance of 3,000 light-years. The color composite image includes eight hours of exposure time with an H-alpha filter, transmiting only the light from recombining hydrogen atoms in the expanding nebulosity and tracing the regions of shocked, glowing gas. This supernova remnant has an apparent age of about 100,000 years - meaning light from the massive stellar explosion first reached Earth 100,000 years ago - but this expanding remnant is not the only aftermath. The cosmic catastrophe also left behind a spinning neutron star or pulsar, all that remains of the original star's core.>>

KimM wrote:"The supernova remnant has an estimated age of about 40,000 years, meaning light from the massive stellar explosion first reached Earth 40,000 years ago." --APOD

Incorrect. If the supernova remnant was created approximately 40,000 years ago and it is 3,000 light years away, then what we are observing today is 37, 000 years old. Be careful with the units. :)

casus b wrote:If it doesn't have a name yet, I nominate the "Rose".

Dave1234 wrote:What is the small nebula just to the left of Simeis 147? And do I see an even smaller red nebula to its left? Perhaps it should be called Siphonaptera. http://en.wikipedia.org/wiki/The_Siphonaptera

BMAONE23 wrote:The larger/brighter of the two to the left is LBN 827 (Lynds Bright Nebula)

Looking at Google Sky, it appears at RA 5H51M54.89S DEC 27d01'28.96"

PhilT wrote:
Never ceases to amaze me, we all loosely throw out numbers like "150 light years across"..... but I wonder if we really get how enormously big that is compared to little old us.

bystander wrote:

BMAONE23 wrote:The larger/brighter of the two to the left is LBN 827 (Lynds Bright Nebula)

Looking at Google Sky, it appears at RA 5H51M54.89S DEC 27d01'28.96"

I've seen the larger labeled as LBN 826 and the smaller as LBN 827.

http://www.flickr.com/photos/hiroc/6930595750/
http://www.flickr.com/photos/hiroc/6930606968/

neufer wrote:

starsurfer wrote:
Spectacular image of what is surely a very faint supernova remnant! As well as Ha, it also contains a lot of OIII emission and there are very few images that include exposures in this waveband.

OIII emission is generally the result of ultraviolet irradiation from a white dwarf CS.

This has just a neutron CS

The only narrowband data was H-Alpha:

http://blog.deepskycolors.com/archive/2011/12/08/simeis-147-and-surroundings.html wrote:
<<Successfully combining narrowband data (H-Alpha in this case) and (L)RGB data can be tricky. One of the usual results is that, since H-Alpha data tends to produce very small stars, when combined with broadband data, the resulting image often presents a rather severe ringing around the stars. Also, some conventional techniques rely on mixing H-Alpha with the red (R) and blue (B) data, but in this case, my RGB data was rather poor so I couldn't rely on just this technique. Therefore, for this particular image I followed a number of conventional as well as non-conventional methods that proved to be rather successful in producing an image that visually documents this area of the sky. Also, as usual in many of my recent images, a multi-scale approach dominated post-processing, in particular to bring out the fainter details that hide behind the swarm of stars.>>

http://apod.nasa.gov/apod/ap050324.html wrote:
<<It's easy to get lost following the intricate filaments in this detailed image of faint supernova remnant Simeis 147. Seen towards the constellation Taurus it covers nearly 3 degrees (6 full moons) on the sky corresponding to a width of 150 light-years at the stellar debris cloud's estimated distance of 3,000 light-years. The color composite image includes eight hours of exposure time with an H-alpha filter, transmiting only the light from recombining hydrogen atoms in the expanding nebulosity and tracing the regions of shocked, glowing gas. This supernova remnant has an apparent age of about 100,000 years - meaning light from the massive stellar explosion first reached Earth 100,000 years ago - but this expanding remnant is not the only aftermath. The cosmic catastrophe also left behind a spinning neutron star or pulsar, all that remains of the original star's core.>>

PhilT wrote:Never ceases to amaze me, we all loosely throw out numbers like "150 light years across"..... but I wonder if we really get how enormously big that is compared to little old us.