RS Sagittari (HD167647)

Aim of the campaign

RS Sagittari is a semidetached binary system which has been very poorly observed.

The initial aim is to determine accurate Time of Minimum for several primary and secondary eclipses.

We will repeat TOM measurements each season in order to accurately determine the period.

{tab Data}

STAR Max V Mag RA 2000 BRNO epoch (HJD) BRNO period Primary / secondary
RS Sgr 6.01 18h17m36.2s 2420586.3870 2.415684 p
    2443336.0970 2.415684 s
Min V Mag DEC 2000 Krakow epoch (HJD) Krakow period  
6.97 -34°06′ 26″ 2452502.4090 2.4156848  

Recent data: 2455778.073172 (0.000074) TOM for primary eclipse (M. Blackford)

 

{tab Light Curve}

rs sagittari light curve

From Shobbrook, R.R., The Journal of Astronomical Data 10, 1 (2004)

 

{tab Observing}

Several nearby stars will interfere with measurements. This is not a problem for TOM measurements.

 

{tab Finder Chart}

The field of RS Sgr is shown in the plot below.

rs sagittari finder chart

 

{tab Comparison Star Data}

Please use the four comparison stars labled on the chart and catalogue values listed below.

Comp Star

Name

RA (J2000)

DEC (J2000)

V

B-V

V-Rc

1

HD169398

18 25 54.61

-33 56 44.5

6.296

-0.081

-0.072

2

HD165793

18 09 22.50

-36 40 21.1

6.553

-0.068

-0.029

3

HD167846

18 18 30.47

-36 41 10.0

6.909

-0.052

-0.064

4

HD167230

18 15 40.18

-33 05 29.5

6.929

-0.003

-0.043

 

{tab Preliminary Results}

The plot below shows a primary minimum observed by Mark Blackford at HJD 2455778.073172 (0.000074) as determined using PERANSO. This is 2min 23sec later than the BRNO primary eclipse prediction and 6min 22sec earlier than the Krakow primary eclipse prediction.

{/tabs}

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