# New Comet C/2012 S1 (ISON)

#### Topper

Donator
A very bright comet has been discoverd which is maybe vissible with naked eye in daylight!

I know that it was allready posted in the Random Comments Thread by Galactic Penguin SST, but I think that we need an own thread for such important discoveries...

This comet is visible from begining of November 2013 to the end of December 2013.

Maybe it's possible to see the comet on day at around the 29th November.

Does someone knows if it's visible form europe in this period of time?

#### Codz

Donator
From what I've read, it should favor northern hemisphere observers, so yes Europe and North America should be able to see it.

#### TMac3000

##### Evil Republican
God, what a sight! I can't wait for next year

#### Topper

Donator
Aha after reading a bit more, i understand why this comet could be "maybe" one of the brightest comets ever:

After calculateting it's orbit, it's seems that the comet is coming directly from the Oort Cloud, and this is the first time this comet is visiting the inner solar system.

But however, these things are not sure, because they've thought the same for the comet "Kohoutek" (It was around 1973), but let's hope they are right for this time!

Sounds great!

P.S.,

maybe they are right and this is Nibiru - :lol:

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#### Codz

Donator
Kohoutek was still a decent naked eye comet, just not the "Comet of the Century".

#### Topper

Donator
Kohoutek was still a decent naked eye comet, just not the "Comet of the Century".

Yes sure, Kohoutek was bright, but not so bright as the scientist said before.

But it seems to be difficult to make a forecast of brightness for an unknown comet which is visiting the inner solar system and was never observed before doing so.

#### boogabooga

##### Bug Crusher
Aha after reading a bit more, i understand why this comet could be "maybe" one of the brightest comets ever:

After calculateting it's orbit, it's seems that the comet is coming directly from the Oort Cloud, and this is the first time this comet is visiting the inner solar system.

But however, these things are not sure, because they've thought the same for the comet "Kohoutek" (It was around 1973), but let's hope they are right for this time!

Sounds great!

P.S.,

maybe they are right and this is Nibiru - :lol:

Wow, that still happens. I wonder what might be out there to scatter this. :hmm:

#### RisingFury

##### OBSP developer
Wow, that still happens. I wonder what might be out there to scatter this. :hmm:

Doesn't take much, actually.

#### Gerdih

##### Member
According to the wiki the comet will pass 0.07 AU from Mars, that could be an awesome screenshot for the PC if any rover is able to take the photo.

#### Topper

Donator
Does somone can help me to transfer the data I've got from http://mpcapp1.cfa.harvard.edu/cgi-bin/returnprepeph.cgi?d=c&o=CK12S010 to orbit elements used by Orbiter?

I just want to create a vessel that flys on same path...
The datas of C/2012 S1 are:

Code:
    C/2012 S1 (ISON)
Epoch 2013 Dec. 14.0 TT = JDT 2456640.5
T 2013 Nov. 28.8704 TT                                  MPC
q   0.012453             (2000.0)            P               Q
z  +0.000003       Peri.  345.5614      +0.3150939      +0.5128707
+/-0.000233       Node   295.6595      -0.7589642      -0.3690114
e   1.000000       Incl.   62.3643      -0.5698150      +0.7751092
From 54 observations 2011 Dec. 28-2012 Sept. 23, mean residual 0".3.

SMa = 11292 AU (Calculated here with the Orbital period ~1.2 million years (epoch 2050), source http://en.wikipedia.org/wiki/C/2012_S1)

Ecc = ~1 ?
Inc = 62.3643
LAN = 295.6595
LPe = 345.5614
eps = ?
Epoch = 566.400
MJD=JD-2400000.5 = 566.400

Does someone can confirm, complete / corect this?

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Donator
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#### Topper

Donator
There are a number of TLE conversion programs. But I also made this some years ago: http://www.orbiterwiki.org/wiki/Orbital_elements#Orbiter_Elements since I can never find the programs.

Ah it's ok,

this is enogh for me for the first:

:thumbup:

Maybe someone else will create an add on soon...

---------- Post added at 21:55 ---------- Previous post was at 21:24 ----------

If you scroll down in the link I've posted, they say

a [semi-major axis] = -57347341492.3674 AU!
That must be a mistake right?
Does this are km?

#### Quick_Nick

##### Passed the Turing Test
Donator
It also appears to have a larger error than value. The comet is "not returning" for all intents and purposes. Some other information may be needed. The inclination and perihelion information seem to be the only values that aren't nonsensical.

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#### tblaxland

Webmaster
I've always had more success getting state vectors from JPL Horizon's and putting those into a scenario, rather than using the orbital elements.

Query:
Ephemeris Type [change] : VECTORS
Target Body [change] : Comet C/2012 S1 (ISON)
Coordinate Origin [change] : Solar System Barycenter (SSB) [[email protected]]
Time Span [change] : Start=2012-10-02, Stop=2012-10-03, Step=1 d
Table Settings [change] : output units=KM-S
Display/Output [change] : default (formatted HTML)

Results:
Code:
2456202.500000000 = A.D. 2012-Oct-02 00:00:00.0000 (CT)
-3.330076566794623E+08  8.529260316982148E+08  1.323505626704913E+08
5.720808259091759E+00 -1.564868564329121E+01 -3.082587218265699E+00
Second line is position X/Y/Z, third line is velocity X/Y/Z.

Scenario:
Code:
BEGIN_DESC
DG in Comet C/2012 S1 (ISON) orbit
END_DESC

BEGIN_ENVIRONMENT
System Sol
Date MJD 56202.000777593
END_ENVIRONMENT

BEGIN_FOCUS
Ship GL-01
END_FOCUS

BEGIN_CAMERA
TARGET GL-01
MODE Cockpit
FOV 50.00
END_CAMERA

BEGIN_MFD Left
TYPE Orbit
PROJ Ship
FRAME Ecliptic
REF Sun
END_MFD

BEGIN_SHIPS
GL-01:DeltaGlider
STATUS Orbiting Sun
RPOS -3.330076566794623E+11 1.323505626704913E+11 8.529260316982148E+11
RVEL 5.720808259091759E+03 -3.082587218265699E+03 -1.564868564329121E+04
AROT 0.00 0.00 0.00
PRPLEVEL 0:1.0 1:1.0
NOSECONE 0 0.0000
GEAR 0 0.0000
AIRLOCK 0 0.0000
END
END_SHIPS

#### Quick_Nick

##### Passed the Turing Test
Donator
Sweet. I was thinking state vectors would be best but I automatically assumed they would be unavailable.

#### RacerX

##### Donator
Donator
I can't help but wonder what disturbed the comet. I mean something out there had to push it out of the ort cloud. I wonder if the theory about the Nemesis star (our suns companion that comes around every 26 million years and is thought to be responsible for hurtling the asteroid/comet that killed the dinosaurs) I heard about on science channel is true and if so there are likely to be more then one comet

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#### Artlav

##### Aperiodic traveller
Beta Tester
There are planet-sized rocks in the Oort cloud, and quite a lot of them.
It would be a matter of a slingshot around one of them to send a comet down on us.

Simpler than inventing an invisible companion star.
Even simpler than inventing an invisible companion star that also caused prior extinction events.

#### RisingFury

##### OBSP developer
There are planet-sized rocks in the Oort cloud,...

*Ahem* Pluto-sized! *Ahem*

#### Quick_Nick

##### Passed the Turing Test
Donator
Science Channel has little credibility left.

#### RacerX

##### Donator
Donator
Science Channel has little credibility left.
Why do you say that? I mean can all those scientists and physicists they are interviewing on the particular program I watched be wrong? I mean I am sure they can but these are creditable people that work in the field. I would like to know what leads you to that conculsion.

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