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APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 5:06 am
by APOD Robot
M1: The Incredible Expanding Crab
Explanation: Cataloged as M1, the Crab Nebula is the first on
Charles Messier's famous list</a> of things which are
not comets. In fact,
the Crab Nebula is now known to be a supernova remnant, an expanding cloud of debris from the death explosion of a massive star. The violent birth of the Crab was
witnessed by astronomers in the year 1054. Roughly
10 light-years across, the nebula is still expanding
at a rate of about 1,500 kilometers per second.
You can see the expansion by
comparing these sharp images from the Hubble Space Telescope and James Webb Space Telescope. The Crab's dynamic, fragmented filaments were captured in visible light by Hubble in 2005 and Webb in infrared light in 2023.
This cosmic crustacean lies about 6,500 light-years away in the
constellation Taurus.
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 5:59 am
by SugarMan
I noticed that the APOD website posted the same photo twice. The photo is very beautiful and impressive, but I wonder why it was posted twice on different dates. Maybe it was a mistake or a glitch in the system. Or maybe the editors liked it so much that they wanted to share it again.
https://apod.nasa.gov/apod/ap231109.html
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 10:15 am
by Lasse H
The idea this time was, I guess, to show the difference in size by giving us the chance to compare it to the older photo.
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 11:08 am
by AVAO
...Crab Nebula (one decade time-lapse movie:
https://www.astrobin.com/327338/0/
Observation sequences of M1, showing the expansion of shock waves emanating from the Pulsar interacting with the surrounding nebula. Chandra X-Rays (left), Hubble Visible light (right). (Credit: NASA, JPL-Caltech)
https://hubblesite.org/contents/media/v ... Video.html
Credit:NASA/ESA
http://cosmicneighbors.net/crab.htm Copyright: Mike Keith
"To the upper right of the nebula is a star in motion. This is the magnitude-11.5 star TYC 1309-1640-1 and it has a high proper motion of about 1/4 arcseconds per year. The image scale here is about 1 arcsecond per pixel, so from 1955 to 2014 it moves (2014-1955)/4 = 15 arcseconds = 15 pixels."
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 12:33 pm
by Christian G.
AVAO wrote: ↑Wed Nov 15, 2023 11:08 am
...Crab Nebula (one decade time-lapse movie:
https://www.astrobin.com/327338/0/
Observation sequences of M1, showing the expansion of shock waves emanating from the Pulsar interacting with the surrounding nebula. Chandra X-Rays (left), Hubble Visible light (right). (Credit: NASA, JPL-Caltech)
https://hubblesite.org/contents/media/v ... Video.html
Credit:NASA/ESA
http://cosmicneighbors.net/crab.htm Copyright: Mike Keith
"To the upper right of the nebula is a star in motion. This is the magnitude-11.5 star TYC 1309-1640-1 and it has a high proper motion of about 1/4 arcseconds per year. The image scale here is about 1 arcsecond per pixel, so from 1955 to 2014 it moves (2014-1955)/4 = 15 arcseconds = 15 pixels."
Fascinating supplement to this APOD!
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 2:12 pm
by hankbernath@msn.com
the two shots are different but not both in IR or visible, so it is not really comparable since IR will show features not visible to visible light. How about both in visible or both in IR in the same time span?
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 2:14 pm
by Chris Peterson
hankbernath@msn.com wrote: ↑Wed Nov 15, 2023 2:12 pm
the two shots are different but not both in IR or visible, so it is not really comparable since IR will show features not visible to visible light. How about both in visible or both in IR in the same time span?
We've seen many such comparisons. But this one involves two very high resolution imagers that simply don't operate in the same part of the spectrum.
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 3:17 pm
by Pastorian
AVAO wrote: ↑Wed Nov 15, 2023 11:08 am
...
http://cosmicneighbors.net/crab.htm Copyright: Mike Keith
"To the upper right of the nebula is a star in motion. This is the magnitude-11.5 star TYC 1309-1640-1 and it has a high proper motion of about 1/4 arcseconds per year. The image scale here is about 1 arcsecond per pixel, so from 1955 to 2014 it moves (2014-1955)/4 = 15 arcseconds = 15 pixels."
"G 100-20 -- a high proper-motion star near M1"
https://cs.astronomy.com/asy/m/nebulae/490961.aspx
- G 100-20 -- a high proper-motion star near M1
"While the evolving nebula is the main actor here, if you look carefully you will find a bonus in the image. On the upper left side, there is a star clearly moving. It is G 100-20, an high proper motion (0.24″/year) star. From its paralax, we find it to be at 58 light years from us."
https://www.virtualtelescope.eu/2021/02 ... -sequence/
Re: APOD: M1: The Incredible Expanding Crab (2023 Nov 15)
Posted: Wed Nov 15, 2023 8:06 pm
by orin stepanek
Don't go too close to the Crab; very dangerous to do so!
The Hyades!
