Observation by Alex Pratt: Lunar occultation of double star SAO 951...

Uploaded by

Alex Pratt

Observer

Alex Pratt

Observed

2017 Apr 02 - 19:39

Uploaded

2017 Apr 04 - 20:54

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Constellation

Grus

Field centre

RA: 22^h27^m
Dec: -45°53'
Position angle: +177°55'

Field size

0°14' × 0°08'

Equipment

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

Exposure

1/50th sec (0.02 sec exposures)

Location

Z92

Target name

SAO 95174

Title

Lunar occultation of double star SAO 95174

About this image

Video photometry of the lunar occultation of the double star SAO 95174 (mag 7.73, component mags 8.15 and 9.25, PA 148.0°, separation 2.15"). The secondary component is designated X 82021.

Limovie analysis of the video recording gave estimated mags of 8.04 and 9.23 for the pair and a relatively long-duration step of 1.845s, shorter than the interval of 2.2s predicted by Occult software.

Reducing the timings of the disappearances of the primary and secondary gave very small O-Cs of -0.01" and 0.03", respectively.

A report will be submitted to Brian Loader (NZ), IOTA's double star coordinator, who collates and analyses worldwide observations. If one or more additional observations of this double star have been obtained in recent weeks the data can be combined to estimate the PA and sub-arcsecond separation of the pair. The most recent entry in the Interferometric Catalogue is from 2008.

Files associated with this observation

S95174 ARP.png (14.7 kB)

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Jeremy Shears, Nick Hewitt, David Basey, Dawson, Thomas Killestein, Peter Carson

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