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Posts posted by johnh
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SPX350 F41.3, PGRFlea3, Baader RGB filters. Imaged from Brisbane, Australia.
This double is tricky at 2.72" separation, the 1st and 5th mag stars are not the only difference because colours of red/orange and blue make a pleasing contrast. This is my best image of the two as the colour of the companion is obvious as seeing was good. Orbital period 1200-2600 years and separation 503 AU.
Regards, John.
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Enjoy the Lounge Claire.
JohnH.
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A warm welcome Paul.
JohnH.
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A warm welcome Revs.
JohnH.
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You have found us at last Pozdrav so welcome from me, John.
JohnH.
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Great to have you hear, lots to read on the forum when nights are cloudy. John.
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Resolution is amazing with not too much shadow Cobra's Head shows detail and tiny crater in Herodotus and rays are evident, great work. John.
Antares double
in Observing and Imaging Double and Variable Stars
Posted
Thanks for the comments, I am told observing using an UHC (Ha OIII broad pass bands) filter makes the pair look like cosmic traffic lights as the red primary and the green/blue secondary contrast better as brightness difference is reduced and seeing is improved slightly.
John.