ISON, which almost immediately after its discovery last September was branded as a "" candidate, now seems in jeopardy of completely disintegrating before skimming just 724,000 miles (1.16 million kilometers) above the surface of the sun on Thanksgiving Day (Nov. 28).
Since early June, ISON has been unobservable because of its close proximity to the sun in our sky. The comet is now slowly moving out of the bright solar glare and is becoming better placed for viewing in the morning, low in the eastern sky just before sunrise. []
When thevanished a couple of months ago, it had brightened very little if at all since the beginning of 2013. Astronomers had hoped that, while masked by the light of the sun, ISON would begin brightening at a more robust pace as it drew nearer to our star.
Unfortunately, that has not happened.
Early on Monday (Aug. 12), Arizona amateur astronomer Bruce Gary became the first person to pick upsince it disappeared in early June. By stacking images acquired by an 11-inch telescope pointing just 6 degrees above the eastern dawn horizon, he succeeded in recording a fuzzy patch of light with a short tail at the comet's predicted position among stars that are as faint as magnitude 16.
Measuring the image, Gary a retired radio astronomer and atmospheric scientist came up with a total magnitude of 14.3 0.2. That is at least two magnitudes fainter than most predictions, and more than a thousand times fainter than the dimmest star that can be perceived with the unaided eye.
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