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Based on an assertion in the answer to: " When Can the Dark Side Be Sensed? ":

Is there some canon (ideally, G-canon but not required) information clearly indicating whether Obi-Wan Kenobi know that Darth Vader was on board of Death Star before they actually physically bumped into each other?

If earlier, just when did he find out?

UPDATE: To clarify, "Vader knew when he discussed it with Tarkin" is NOT evidence for or against, unless there's a canon proof that Obi-Wan must have detected Vader at the same time as Vader detected Obi-Wan

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Why the downvote? –  DVK Feb 24 '12 at 21:04
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He said he doesn't like you. –  Mazura Aug 25 at 18:01
    
@Mazura - I'll be careful. –  DVK Aug 25 at 19:12
    
You'll be dead! –  Richard Aug 25 at 21:26

3 Answers 3

up vote 4 down vote accepted

The novelisation for "Star Wars : A New Hope" (listed as having been authored by George Lucas but famously ghost-written by Alan Dean Foster) places Obi Wan's sensing of Vader's presence much later on than Vader's conversation with Tarkin:

Kenobi had avoided one patrol after another, slowly working his way back toward the docking bay holding the freighter. Just another two turns and he should be at the hangar. What he would do then would be determined by how inconspicuous his charges had been.

a few minutes later

Ben sensed something directly ahead and slowed cautiously. It had a most familiar feel to it, a half-remembered mental odor he could not quite place. Then the figure stepped out in front of him, blocking his entry to the hangar not five meters away. The outline and size of the figure completed the momentary puzzle. It was the maturity of the mind he had sensed that had temporarily confused him. His hand moved naturally to the hilt of his deactivated saber.

Although Kenobi may have subconsciously suspected something was wrong (his insistence on Luke staying behind, the fact that he repeatedly checks his lightsaber, etc) he doesn't consciously realise that it's Anakin/Vader until he practically falls over him.

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"Mental odor"? "What an incredible new smell you've discovered!" –  DVK Aug 25 at 16:28
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@DVK - You asked for a G-Canon answer, and you shall have one... –  Richard Aug 25 at 16:29

The first time Vader felt Obi-Wan's presence was shortly after the Millenium Falcon landed. From The Star Wars: A New Hope script

VADER: Send a scanning crew on board. I want every part of this ship checked.
OFFICER: Yes, sir.
VADER: I sense something...a presence I haven't felt since...
Vader turns quickly and exits the hangar.

We could assume Obi-Wan also felt his presence at this time, but he said nothing about it. He made his plan and later, Vader sensed his intentions. Just after Luke and Han made Leia out of her Cell, Vader had this discussion with Tarkin.

Also from The Star Wars: A New Hope script

VADER: Obi-Wan is here. The Force is with him.
TARKIN: If you're right, he must not be allowed to escape.
VADER: Escape is not his plan. I must face him alone.

So, Obi-Wan must be aware of Vader's presence before that because he felt that Obi-Wan planned his duel with him. To plan this duel, Obi-Wan must be aware of the presence of his apprentice.

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"Obi-Wan must be aware of Vader's presence much before that." - can you explain why? If you look at the linked question, it's specifically postulated that Vader may have known WAY before Obi-Wan. That was precisely the point of my question. –  DVK Jan 17 '12 at 14:38
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Obi-Wan couldn't plan to duel Vader if he didn't know he was there. –  Rob Jan 18 '12 at 16:57
    
Fair enough. +1 and accept –  DVK Oct 16 '13 at 18:52
    
@dvk - Escape isn't his plan. He's busily sabotaging the station at this point. –  Richard Aug 25 at 16:21

I think it started with the destruction of Alderaan, Vader mention in the meeting on the Death Star, the ability to destroy a plan is "insignificant to the power of the force" and on another planet, Obi-Wan says to Luke, you must come with me to Alderaan.

Knowing the time is upon them, from What Yoda Said in the prequel on the Wookie planet. So, back to the destruction of Alderaan, same influence as in the Return of the Jedi, when Darth Vader was luring Luke by inflicting pain on Han, and Leia, mainly Leia. Darth Vader used the death star to Lure Obi Wan out but didn't know about Luke and Leia yet.

Something as powerful as the force also felt the death of the people at once when that happened. Another fact was the payment would be paid when they reach Alderaan. He knew they would not be able to do that and knew the moon was a space station and knew exactly where and when to be while on the Death Star.

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You may want to edit this with an axe to try to make it less incoherent. –  Richard Aug 25 at 16:39

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