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Lunar occultation of double star 49 Leonis

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About this observation
Observer
Alex Pratt
Time of observation
04/05/2017 - 23:14
Object
49 Leonis
Observing location
Z92
Equipment
C11 @ f/10
Watec 910 video camera
IOTA-VTI GPS time inserter
Exposure
1/50th sec (50 fields per second)
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This is an interesting double star because 49 Leonis = R1550 = STF1450 (Struve) = TX Leonis, where the primary is an eclipsing binary of type EA, with a magnitude range of 5.66 to 5.75 and a period of 2.4450566 days, and the secondary is a mag 7.9 companion (X118734) at a separation of 2.1".

Analysis of the video using Limovie gave estimated mags of 5.75 and 7.8 for the pair (assuming a combined mag of 5.6), in close agreement with the values in the Washington Double Star Catalogue, and a long-duration step of 3.920s, as predicted by Occult software (4s).

It was hoped to combine these results with other video observations to estimate the PA and separation of the long-period pair, but unfortunately Tim Haymes and Phil Denyer were clouded out and Brian Loader (NZ, IOTA's double star coordinator) has not received any other observations of this double. The most recent entry in the Interferometric Catalogue is from 2007.

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