Origin of Isons incoming path in nightsky?

I've looked around and have a couple of questions regarind comets and specifically ISON that i could not find on internet.


1. Is there interstellar and solarsystem regional comets?

2. I've assumed that sun grazing interstellar comets always approach in a straight line towards sun, so when looking at nightsky they have origin in a quadrant and moving perpendicular towards our sun? Is this correct?

3. If above is correct from which quadrant did ISON origin?

4. If one was to pin point the start vector that ISON did approach our sun, where did it origin. Which are the three closest naked eye visible stars in the nightsky if i wanted to pinpoint the origin of ISON in the sky.

5. Is the acceleration of a sun grazing star dependent on its mass?

6. Which was ISONS entering speed into our solar system, and what will its speed be after slingshot our sun?

7. What is ISONS mass and coresize, and how is these established, visual inspection or instruments?

Den måndagen den 25:e november 2013 kl. 04:27:21 UTC+1 skrev :
I've looked around and have a couple of questions regarind comets and specifically ISON that i could not find on internet.





1. Is there interstellar and solarsystem regional comets?



2. I've assumed that sun grazing interstellar comets always approach in a straight line towards sun, so when looking at nightsky they have origin in a quadrant and moving perpendicular towards our sun? Is this correct?



3. If above is correct from which quadrant did ISON origin?



4. If one was to pin point the start vector that ISON did approach our sun, where did it origin. Which are the three closest naked eye visible stars in the nightsky if i wanted to pinpoint the origin of ISON in the sky.



5. Is the acceleration of a sun grazing star dependent on its mass?



6. Which was ISONS entering speed into our solar system, and what will its speed be after slingshot our sun?



7. What is ISONS mass and coresize, and how is these established, visual inspection or instruments?

I look know on this picture that what is interstellar and solar system may be the same thing? I read that oort cloude part of the solar system.

But could comets reach us from outside oort cloude, even slingshot between different solar systems?

http://media1.s-nbcnews.com/j/stream...ktop_large.jpg

Interesting, i once read that if sun was size of a sphere with 1 m diameter the earth would be size of a pea 120 yards away. And if that represent one AU then oorth cloude is starting 10 km away and reaching out 100 000 km it is just infathomable, what a gigantic volume how many objects must it not incorporate.

One can also wonder how big an earth size planet is from a distance of 100 000 AU. Could it be that there are earth sized planets in oort cloude, but because of their focal point between us and the other stars they do not cover enough surface of a star to shade it?

Kind of thrilling and a bit bothersome, we may be able to detect planets orbiting other solar system, but may be unable to detect planetary sized objects within our own outer solar system.

wrote:
Den måndagen den 25:e november 2013 kl. 04:27:21 UTC+1 skrev
:
I've looked around and have a couple of questions regarind comets
and specifically ISON that i could not find on internet.





1. Is there interstellar and solarsystem regional comets?


It is thought (based on the evidence) that long-period comets originate in
the Oort Cloud, which is part of our solar system, but very far out from the
Sun. The only way you can tell the origin of a comet is from its orbital
elements, and none of them have originally hyperbolic orbits indicating
extra-solar origins.



2. I've assumed that sun grazing interstellar comets always approach
in a straight line towards sun, so when looking at nightsky they
have origin in a quadrant and moving perpendicular towards our sun?
Is this correct?

They are always in elliptical orbits of extremely high eccentricity, almost
indistinguishable from a parabola. So not really a straight line. But the
direction of origin can be deduced with a bit of calculation.




3. If above is correct from which quadrant did ISON origin?


I'm not sure. You would need to check the orbital elements.



4. If one was to pin point the start vector that ISON did approach
our sun, where did it origin. Which are the three closest naked eye
visible stars in the nightsky if i wanted to pinpoint the origin of
ISON in the sky.


See above.



5. Is the acceleration of a sun grazing star dependent on its mass?


No. Compared to the Sun all comets are like "test particles".



6. Which was ISONS entering speed into our solar system, and what
will its speed be after slingshot our sun?


These comets all start from the Oort cloud with "almost" zero relative
velocity (a few m/sec or less). They fall freely towards the Sun, reach a
maximum speed as they go around the Sun, then slow down as they head back
out towards the Oort Cloud.



7. What is ISONS mass and coresize, and how is these established,
visual inspection or instruments?

It's hard to say exactly, but it is based on estimates of the size of the
nucleus from the rate of emission of dust and gas. Only a very few comets
have been viewed close-up by spacecraft, and the nuclei are pretty small (a
few km, usually).


I look know on this picture that what is interstellar and solar
system may be the same thing? I read that oort cloude part of the
solar system.

Correct.


But could comets reach us from outside oort cloude, even slingshot
between different solar systems?

http://media1.s-nbcnews.com/j/stream...ktop_large.jpg

While possible, it is unlikely. Sun-grazing comets need to start out with
nearly zero relative velocity. If there were some interstellar comets,
chances are that they would not get very close to the Sun and become
visible, because their relative velocity would start out as several km/sec.


Interesting, i once read that if sun was size of a sphere with 1 m
diameter the earth would be size of a pea 120 yards away. And if that
represent one AU then oorth cloude is starting 10 km away and
reaching out 100 000 km it is just infathomable, what a gigantic
volume how many objects must it not incorporate.

Sounds about right.


One can also wonder how big an earth size planet is from a distance
of 100 000 AU. Could it be that there are earth sized planets in oort
cloude, but because of their focal point between us and the other
stars they do not cover enough surface of a star to shade it?

There has been some speculation, at least regarding the Kuiper Belt, for
large bodies. After all, we know already about objects larger than Pluto.
And there has also been speculation that large bodies in the Oort Cloud are
what perturb comets into the inner solar system. How they might get there
is not known.


Kind of thrilling and a bit bothersome, we may be able to detect
planets orbiting other solar system, but may be unable to detect
planetary sized objects within our own outer solar system.

Detection would certainly be very difficult.

--
Mike Dworetsky

(Remove pants sp*mbl*ck to reply)

Den måndagen den 25:e november 2013 kl. 09:32:38 UTC+1 skrev Mike Dworetsky:
wrote:

Den m�ndagen den 25:e november 2013 kl. 04:27:21 UTC+1 skrev

:

I've looked around and have a couple of questions regarind comets

and specifically ISON that i could not find on internet.











1. Is there interstellar and solarsystem regional comets?





It is thought (based on the evidence) that long-period comets originate in

the Oort Cloud, which is part of our solar system, but very far out from the

Sun. The only way you can tell the origin of a comet is from its orbital

elements, and none of them have originally hyperbolic orbits indicating

extra-solar origins.







2. I've assumed that sun grazing interstellar comets always approach

in a straight line towards sun, so when looking at nightsky they

have origin in a quadrant and moving perpendicular towards our sun?

Is this correct?



They are always in elliptical orbits of extremely high eccentricity, almost

indistinguishable from a parabola. So not really a straight line. But the

direction of origin can be deduced with a bit of calculation.









3. If above is correct from which quadrant did ISON origin?





I'm not sure. You would need to check the orbital elements.







4. If one was to pin point the start vector that ISON did approach

our sun, where did it origin. Which are the three closest naked eye

visible stars in the nightsky if i wanted to pinpoint the origin of

ISON in the sky.





See above.







5. Is the acceleration of a sun grazing star dependent on its mass?





No. Compared to the Sun all comets are like "test particles".







6. Which was ISONS entering speed into our solar system, and what

will its speed be after slingshot our sun?





These comets all start from the Oort cloud with "almost" zero relative

velocity (a few m/sec or less). They fall freely towards the Sun, reach a

maximum speed as they go around the Sun, then slow down as they head back

out towards the Oort Cloud.







7. What is ISONS mass and coresize, and how is these established,

visual inspection or instruments?



It's hard to say exactly, but it is based on estimates of the size of the

nucleus from the rate of emission of dust and gas. Only a very few comets

have been viewed close-up by spacecraft, and the nuclei are pretty small (a

few km, usually).





I look know on this picture that what is interstellar and solar

system may be the same thing? I read that oort cloude part of the

solar system.



Correct.





But could comets reach us from outside oort cloude, even slingshot

between different solar systems?



http://media1.s-nbcnews.com/j/stream...ktop_large.jpg



While possible, it is unlikely. Sun-grazing comets need to start out with

nearly zero relative velocity. If there were some interstellar comets,

chances are that they would not get very close to the Sun and become

visible, because their relative velocity would start out as several km/sec.





Interesting, i once read that if sun was size of a sphere with 1 m

diameter the earth would be size of a pea 120 yards away. And if that

represent one AU then oorth cloude is starting 10 km away and

reaching out 100 000 km it is just infathomable, what a gigantic

volume how many objects must it not incorporate.



Sounds about right.





One can also wonder how big an earth size planet is from a distance

of 100 000 AU. Could it be that there are earth sized planets in oort

cloude, but because of their focal point between us and the other

stars they do not cover enough surface of a star to shade it?



There has been some speculation, at least regarding the Kuiper Belt, for

large bodies. After all, we know already about objects larger than Pluto..

And there has also been speculation that large bodies in the Oort Cloud are

what perturb comets into the inner solar system. How they might get there

is not known.





Kind of thrilling and a bit bothersome, we may be able to detect

planets orbiting other solar system, but may be unable to detect

planetary sized objects within our own outer solar system.



Detection would certainly be very difficult.



--

Mike Dworetsky



(Remove pants sp*mbl*ck to reply)

http://science1.nasa.gov/science-new...01/ast26nov_1/

Den måndagen den 25:e november 2013 kl. 19:52:47 UTC+1 skrev :
Den måndagen den 25:e november 2013 kl. 09:32:38 UTC+1 skrev Mike Dworetsky:

wrote:



Den m�ndagen den 25:e november 2013 kl. 04:27:21 UTC+1 skrev



:



I've looked around and have a couple of questions regarind comets



and specifically ISON that i could not find on internet.























1. Is there interstellar and solarsystem regional comets?











It is thought (based on the evidence) that long-period comets originate in



the Oort Cloud, which is part of our solar system, but very far out from the



Sun. The only way you can tell the origin of a comet is from its orbital



elements, and none of them have originally hyperbolic orbits indicating



extra-solar origins.















2. I've assumed that sun grazing interstellar comets always approach



in a straight line towards sun, so when looking at nightsky they



have origin in a quadrant and moving perpendicular towards our sun?



Is this correct?







They are always in elliptical orbits of extremely high eccentricity, almost



indistinguishable from a parabola. So not really a straight line. But the



direction of origin can be deduced with a bit of calculation.



















3. If above is correct from which quadrant did ISON origin?











I'm not sure. You would need to check the orbital elements.















4. If one was to pin point the start vector that ISON did approach



our sun, where did it origin. Which are the three closest naked eye



visible stars in the nightsky if i wanted to pinpoint the origin of



ISON in the sky.











See above.















5. Is the acceleration of a sun grazing star dependent on its mass?











No. Compared to the Sun all comets are like "test particles".















6. Which was ISONS entering speed into our solar system, and what



will its speed be after slingshot our sun?











These comets all start from the Oort cloud with "almost" zero relative



velocity (a few m/sec or less). They fall freely towards the Sun, reach a



maximum speed as they go around the Sun, then slow down as they head back



out towards the Oort Cloud.















7. What is ISONS mass and coresize, and how is these established,



visual inspection or instruments?







It's hard to say exactly, but it is based on estimates of the size of the



nucleus from the rate of emission of dust and gas. Only a very few comets



have been viewed close-up by spacecraft, and the nuclei are pretty small (a



few km, usually).











I look know on this picture that what is interstellar and solar



system may be the same thing? I read that oort cloude part of the



solar system.







Correct.











But could comets reach us from outside oort cloude, even slingshot



between different solar systems?







http://media1.s-nbcnews.com/j/stream...ktop_large.jpg







While possible, it is unlikely. Sun-grazing comets need to start out with



nearly zero relative velocity. If there were some interstellar comets,



chances are that they would not get very close to the Sun and become



visible, because their relative velocity would start out as several km/sec.











Interesting, i once read that if sun was size of a sphere with 1 m



diameter the earth would be size of a pea 120 yards away. And if that



represent one AU then oorth cloude is starting 10 km away and



reaching out 100 000 km it is just infathomable, what a gigantic



volume how many objects must it not incorporate.







Sounds about right.











One can also wonder how big an earth size planet is from a distance



of 100 000 AU. Could it be that there are earth sized planets in oort



cloude, but because of their focal point between us and the other



stars they do not cover enough surface of a star to shade it?







There has been some speculation, at least regarding the Kuiper Belt, for



large bodies. After all, we know already about objects larger than Pluto.



And there has also been speculation that large bodies in the Oort Cloud are



what perturb comets into the inner solar system. How they might get there



is not known.











Kind of thrilling and a bit bothersome, we may be able to detect



planets orbiting other solar system, but may be unable to detect



planetary sized objects within our own outer solar system.







Detection would certainly be very difficult.







--



Mike Dworetsky







(Remove pants sp*mbl*ck to reply)



http://science1.nasa.gov/science-new...01/ast26nov_1/

I Think there may been a solar flare from sun, is it ison down to the right in Sohos Pictures. Which direction would Earth be relative Soho Picture?


http://sohowww.nascom.nasa.gov/data/...512/latest.jpg

wrote:





http://science1.nasa.gov/science-new...01/ast26nov_1/

I Think there may been a solar flare from sun, is it ison down to the
right in Sohos Pictures. Which direction would Earth be relative Soho
Picture?

Soho is on a line from Earth to Sun, about 1.5 million km from Earth at the
L1 lagrangian point. So in the images, "It's behind you!".



http://sohowww.nascom.nasa.gov/data/...512/latest.jpg

--
Mike Dworetsky

(Remove pants sp*mbl*ck to reply)