Most of what you hear about comet Elenin is unsupported opinion from people who don’t know what they’re talking about. Paul said people like this have a zeal for God but not according to knowledge (Romans 10:2). Those who do know what they’re talking about say you’ll be lucky to even see it let alone feel its effects. It’s closest approach to Earth will be about 21 million miles (on Oct 16) and its gravitational pull will be immeasurably miniscule. One astronomer said its effect on Earth will be similar to the effect a mosquito would have on a super tanker.
As for the rapture, I believe the time is near but remember, it’s a secret, signless event. There’s no Biblical support for any kind of warning that would alert us to its coming. Neither is there any Biblical support for the Rapture happening on the Feast of Trumpets. It will happen at a time no one on Earth could have predicted in advance, although as believers we should be living in a constant state of expectation