Observation by Alex Pratt: Lunar occultation of double star 49 Leon...

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Alex Pratt

Observer

Alex Pratt

Observed

2017 May 04 - 22:14

Uploaded

2017 May 08 - 22:51

Objects

TX-Leo
Lightcurve
Variable star

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Constellation

Grus

Field centre

RA: 22^h44^m
Dec: -46°55'
Position angle: -0°52'

Field size

0°07' × 0°04'

Equipment

C11 @ f/10
Watec 910 video camera
IOTA-VTI GPS time inserter

Exposure

1/50th sec (50 fields per second)

Location

Z92

Target name

49 Leonis

Title

Lunar occultation of double star 49 Leonis

About this image

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.

Files associated with this observation

R1550_20170504_ARP_Diffraction.png (15.5 kB)

Like this image

Dawson, David Basey, Bill Leatherbarrow, Jeremy Shears, Mike Olason, Peter Carson

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