APOD: Comet ISON Rising (2013 Nov 27)

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Expand view Topic review: APOD: Comet ISON Rising (2013 Nov 27)

Re: APOD: Comet ISON Rising (2013 Nov 27)

by neufer » Fri Nov 29, 2013 12:49 pm

http://astrobob.areavoices.com/2013/11/29/comet-ison-update-nov-29-still-kicking/ wrote: Comet ISON update Nov. 29 – Still kicking!
by Astrobob, Nov. 29

<<ISON refuses to die. Maybe it’s perspective or better illumination of the comet’s dust through forward scattering (backlighting by sunlight – like seeing someone’s breath on a cold day) or further vaporization of the remaining chunks of ISON’s nucleus. Whatever the cause, the comet has clearly brightened over the past six hours. Around 6 o’clock Thursday evening, ISON was fainter than first magnitude Antares. Now it’s at least magnitude 0. Bring it on!>>

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Anthony Barreiro » Fri Nov 29, 2013 4:10 am

Spaceweather.com copies a soho movie showing something emerging from the far side of ISON's encounter with the Sun: "Whether this is a small scorched fragment of Comet ISON's nucleus or perhaps a "headless comet"--a stream of debris marking the remains of the comet's disintegrated core--remains to be seen."

Re: APOD: Comet ISON Rising (2013 Nov 27)

by BMAONE23 » Fri Nov 29, 2013 2:32 am

The latest SOHO LASCO C3 image appears to show the comet or fragments past perihelion and continuing

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Ann » Fri Nov 29, 2013 1:33 am

Oh. :(

Ann

Re: APOD: Comet ISON Rising (2013 Nov 27)

by MargaritaMc » Thu Nov 28, 2013 10:12 pm

geckzilla wrote:The latest news from the live NASA hangout on ISON is that it has very probably disintegrated.
http://www.bbc.co.uk/news/science-environment-25143861

'Despite its great size, Ison was probably torn apart in the immense heat and tidal forces so close to the Sun.

The European Space Agency's experts on the Soho Sun-watching satellite called the death of the comet at about 21:30 GMT.

"Our Soho scientists have confirmed, Comet Ison is gone," Esa's twitter feed announced.'

RIP Ison.
M

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Beyond » Thu Nov 28, 2013 9:37 pm

Awww, shucks!

Re: APOD: Comet ISON Rising (2013 Nov 27)

by geckzilla » Thu Nov 28, 2013 8:17 pm

The latest news from the live NASA hangout on ISON is that it has very probably disintegrated.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by BMAONE23 » Thu Nov 28, 2013 7:45 pm

ISON reached perihelion at 11:37 Pacific time or 18:37UTC at a distance of just over 1.2 million miles or 2 million kilometers and a Max speed of 800,364 mph and has begun shedding speed

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Ludo » Thu Nov 28, 2013 7:00 pm

neufer wrote:
Ludo wrote:
Why aren't there anymore up to date reports on the space weather site or in the link mentioned in this post? Quite a lot has happened to Ison since yesterday I imagine... :|
http://www.nasa.gov/ison/

Thanks Neufer!!

Re: APOD: Comet ISON Rising (2013 Nov 27)

by geckzilla » Thu Nov 28, 2013 5:58 pm

Well, if you were a very large space-dwelling creature, your olfactory senses would have to be vast and designed to pick up the trace chemicals existing in the hard vacuum of the space environment. ;)

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Chris Peterson » Thu Nov 28, 2013 4:35 pm

Ann wrote:In space no one can smell your smell.
But I'll bet space suits can get a bit ripe...

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Ann » Thu Nov 28, 2013 4:27 pm

geckzilla wrote:
Nitpicker wrote:
The smell of astronomical objects is so rarely discussed. Anyone know any olfacto-astronomers?
Calabash!
In space no one can smell your smell.

Ann

Re: APOD: Comet ISON Rising (2013 Nov 27)

by geckzilla » Thu Nov 28, 2013 4:19 pm

Nitpicker wrote:
...
neufer wrote:
A Zubenelgenubi by any other name would smell as sweet.
...


It is my favourite star name.
...

The smell of astronomical objects is so rarely discussed. Anyone know any olfacto-astronomers?
Calabash!

Re: APOD: Comet ISON Rising (2013 Nov 27)

by neufer » Thu Nov 28, 2013 1:47 pm

Ludo wrote:
Why aren't there anymore up to date reports on the space weather site or in the link mentioned in this post? Quite a lot has happened to Ison since yesterday I imagine... :|
http://www.nasa.gov/ison/

Re: APOD: Comet ISON Rising (2013 Nov 27)

by neufer » Thu Nov 28, 2013 1:42 pm

Nitpicker wrote:
neufer wrote:
A Zubenelgenubi by any other name would smell as sweet.
It is my favourite star name.

The smell of astronomical objects is so rarely discussed. Anyone know any olfacto-astronomers?
Click to play embedded YouTube video.
  • Professor Hubert J. Farnsworth
http://futurama.wikia.com/wiki/Smell-O-Scope wrote:
http://images1.wikia.nocookie.net/__cb2 ... -Scope.png
http://www.comedycentral.com/video-clip ... melloscope

"If a dog craps anywhere in the universe,
you can bet I won't be out of the loop
."
―Hubert J. Farnsworth[source]

<<The Smell-O-Scope was an invention created by Professor Farnsworth. It allowed users to smell odors over extremely long distances. Though it was damaged in Bender's Big Score, it later returned, intact, in The Beast with a Billion Backs. Another, smaller version, shaped like a large cake, was also featured in The Beast with a Billion Backs.>>

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Ludo » Thu Nov 28, 2013 1:41 pm

Why aren't there anymore up to date reports on the space weather site or in the link mentioned in this post? Quite a lot has happened to Ison since yesterday I imagine... :|

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Nitpicker » Thu Nov 28, 2013 7:57 am

neufer wrote:A Zubenelgenubi by any other name would smell as sweet.
It is my favourite star name.

The smell of astronomical objects is so rarely discussed. Anyone know any olfacto-astronomers?

Re: APOD: Comet ISON Rising (2013 Nov 27)

by neufer » Thu Nov 28, 2013 1:14 am

Chris Peterson wrote:
Anthony Barreiro wrote:
Chris Peterson wrote:
... Alpha Libra is right next to Saturn, so it's also lost in the twilight.)
Alpha Librae --I know you're quietly campaigning to put the Latin genitive case in the dustbin of history, but we are talking about a star that belongs to the constellation Libra, not about the brightest constellation named Libra, so the genitive makes more sense than the nominative case. One thing I love about the study of astronomy is that it connects us to other people around the world and throughout history, including the opportunity to learn a bit of Latin, Greek, and Arabic.
Nope, using the Latin genitive in an English sentence makes no sense to me. Alpha Libra - the brightest star in the constellation Libra. I don't care if others follow the convention, but I choose not to do so. Since there's no possibility of confusing the meaning, either construction should be fine. (I don't want to get rid of the Latin genitive; when I'm reading Latin, it makes perfect sense!)
A Zubenelgenubi by any other name would smell as sweet.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Chris Peterson » Wed Nov 27, 2013 11:22 pm

Anthony Barreiro wrote:
Chris Peterson wrote: ... Alpha Libra is right next to Saturn, so it's also lost in the twilight.)
Alpha Librae --I know you're quietly campaigning to put the Latin genitive case in the dustbin of history, but we are talking about a star that belongs to the constellation Libra, not about the brightest constellation named Libra, so the genitive makes more sense than the nominative case. One thing I love about the study of astronomy is that it connects us to other people around the world and throughout history, including the opportunity to learn a bit of Latin, Greek, and Arabic.
Nope, using the Latin genitive in an English sentence makes no sense to me. Alpha Libra - the brightest star in the constellation Libra. I don't care if others follow the convention, but I choose not to do so. Since there's no possibility of confusing the meaning, either construction should be fine.

(I don't want to get rid of the Latin genitive; when I'm reading Latin, it makes perfect sense!)

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Anthony Barreiro » Wed Nov 27, 2013 11:09 pm

Chris Peterson wrote: ... Alpha Libra is right next to Saturn, so it's also lost in the twilight.)
Alpha Librae --I know you're quietly campaigning to put the Latin genitive case in the dustbin of history, but we are talking about a star that belongs to the constellation Libra, not about the brightest constellation named Libra, so the genitive makes more sense than the nominative case. One thing I love about the study of astronomy is that it connects us to other people around the world and throughout history, including the opportunity to learn a bit of Latin, Greek, and Arabic.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by moconnor » Wed Nov 27, 2013 8:35 pm

Nitpicker wrote:
ristau5741 wrote:what was that object streaking across the video at a high rate of speed in the upper right hand corner about 15-17 seconds into the video???
that thing was flying...
Being a time lapse video, everything is moving much faster than it would naturally. My guess is the streak is a satellite -- they tend to be more visible at dusk and dawn.
I noticed two very fast streaks: one around 17 seconds at the upper right and one just shy of 20 seconds a little lower and more horizontal.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Anthony Barreiro » Wed Nov 27, 2013 7:55 pm

Chris Peterson wrote:
Anthony Barreiro wrote:Does anyone know what equipment was used to make this time lapse video? I watched Comet ISON through 11x56mm binoculars the same morning, November 22, although about eight hours after this video was shot, due to my more western longitude. Mercury, Alpha Librae, and Saturn were visible to the unaided eye. In the video I can only see ISON and Mercury. I'm trying to understand the discrepancy.
Given the FOV and sort of equipment most serious imagers use, I'd guess this was taken with a full-frame DSLR and something around a 70 mm lens. Looks like the start was about 5 am. Saturn was only just rising at the end, where the sky is saturating the image, which is why you can't see it. Your eye has a wider effective dynamic range than the camera. In order to have captured Saturn on the sensor, the exposure time would need to be reduced. (Saturn is about as far below Mercury as Mercury is sideways from ISON. Alpha Libra is right next to Saturn, so it's also lost in the twilight.)
Thanks Chris. That makes sense.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Chris Peterson » Wed Nov 27, 2013 7:30 pm

Anthony Barreiro wrote:Does anyone know what equipment was used to make this time lapse video? I watched Comet ISON through 11x56mm binoculars the same morning, November 22, although about eight hours after this video was shot, due to my more western longitude. Mercury, Alpha Librae, and Saturn were visible to the unaided eye. In the video I can only see ISON and Mercury. I'm trying to understand the discrepancy.
Given the FOV and sort of equipment most serious imagers use, I'd guess this was taken with a full-frame DSLR and something around a 70 mm lens. Looks like the start was about 5 am. Saturn was only just rising at the end, where the sky is saturating the image, which is why you can't see it. Your eye has a wider effective dynamic range than the camera. In order to have captured Saturn on the sensor, the exposure time would need to be reduced. (Saturn is about as far below Mercury as Mercury is sideways from ISON. Alpha Libra is right next to Saturn, so it's also lost in the twilight.)

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Anthony Barreiro » Wed Nov 27, 2013 5:42 pm

Does anyone know what equipment was used to make this time lapse video? I watched Comet ISON through 11x56mm binoculars the same morning, November 22, although about eight hours after this video was shot, due to my more western longitude. Mercury, Alpha Librae, and Saturn were visible to the unaided eye. In the video I can only see ISON and Mercury. I'm trying to understand the discrepancy.

This is a lovely video, by the way. I would love to visit the Canary Islands some day.

Re: APOD: Comet ISON Rising (2013 Nov 27)

by Nitpicker » Wed Nov 27, 2013 2:01 pm

ristau5741 wrote:what was that object streaking across the video at a high rate of speed in the upper right hand corner about 15-17 seconds into the video???
that thing was flying...
Being a time lapse video, everything is moving much faster than it would naturally. My guess is the streak is a satellite -- they tend to be more visible at dusk and dawn.

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