Register to reply

Hyperbolic Comet C-2012 S1 (ISON)

by Philosophaie
Tags: c2012, comet, hyperbolic, ison
Share this thread:
Philosophaie
#1
Oct21-13, 01:38 PM
P: 366
What is happening with Hyperbolic Comet C-2012 S1 (ISON)? It is going to crash into the Sun at the end of Nov. Was it downgraded from a Comet? Here is a site that used to track it:

http://www.heavens-above.com/Comets....d&alt=0&tz=CET

I should be big in the night sky right now and soon it should be visible in the daylight.
Phys.Org News Partner Astronomy news on Phys.org
Fermi finds a 'transformer' pulsar
Astrophysicists model the formation of the oldest-known star in our galaxy
Hubble traces the halo of a galaxy more accurately than ever before
mfb
#2
Oct21-13, 03:16 PM
Mentor
P: 11,573
"used to track it"? The last observation is from today.
With a magnitude of 13.5, it is too dim to be visible in daylight, and even at night you need a telescope. It reaches its perihelion in about a month, then we'll see what happens.
Chronos
#3
Oct21-13, 03:18 PM
Sci Advisor
PF Gold
Chronos's Avatar
P: 9,359
The behavior of comets is about as predictable as a cat. At present, some doubt it will ever reach naked eye visibility, while others think it may become as bright as Venus. Those who think it will achieve 'comet of the century' status are rivaled in numbers by those who think it is the harbinger of doomsday.

Dotini
#4
Nov21-13, 10:23 AM
PF Gold
P: 504
Hyperbolic Comet C-2012 S1 (ISON)

ISON is currently easily visible with binoculars, but will soon disappear in the sun's glare as it goes into perihelion.

Assuming the comet doesn't disintegrate and the orbital mechanics don't change, planet Earth will begin a quick pass through the tail of C/2012 S1 (ISON) on about January 1, 2014. http://ssd.jpl.nasa.gov/sbdb.cgi?sst...og=0;cad=0#orb

At this point, the nucleus will be about .449 AU (about 67 million kilometers, or 46 million miles) from Earth, and going away. The record length of a comet tail is 311 million kilometers.

There are several flavors of comet tails. First is the dust tail, which is a very fine soot. Then there are the ion tails, which can be several kinds of charged particles.


Register to reply

Related Discussions
Ison Comet Astronomy & Astrophysics 26
Hyperbolic Geometry: Parameterization of Curves for Hyperbolic Distance Calculus & Beyond Homework 1
Hyperbolic area sector confirmed with hyperbolic functions Calculus 0