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Hi Jonathan,
I'm quite sure of this observation. I checked PA (using the drift method) and comparision with the Rigel suggested the angular separation was correct as well.
With regard to false images, the one thing that makes discount this was the fact that companion moved with Sirius across the field. It kept its position relative to Sirius, and a reflection would not tend to do this.
Good seeing I think plays a big part, as the slightest amount of fuzziness will obscure the star within the glare of Sirius. Also my scope is very new and the eyepieces were cleaned prior to observation, so scattered light was minimised.
I should also say I have tried to split Sirius for many years and had never succeeded.
Terry
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