Variable Star TY Sagittae



 
 
 
 

 
The photometry of TY Sge has been unclear until now.. Edward G. Schmid (1996)found it irregularly varying between 11.9 and 12.2 with a period of 150 days with numerous aliases near one day. these fators together with its very red color lead us to conclude that it is a semi-regular variable
 
 
 
 
 
 
Coordinates and Photometry for TY Sge.- 
  Precise astrometry of TY Sge done with CCD images taken by  D. Rodriguez (2003 September. 16.913 (UT), with respect to the USNO A2  reference frame (~80 stars, mean residual ~ 0".3) 
Software: Astrometrica by Herbert Raab (Austria) 
  R.A.  = 20:03:37.48 
  Decl. = +17:01:28.3  (J2000.0). 
Photometry Unfiltered : CCD observations calibrated  on V-magnitude sequence. 
Comparison star  Tycho catalog 
Equipment:
Telescope Schmidt-Cassegrain.  0.20-m f/10 + CCD ST9 
HJD
 unfiltered CCD V
2452901.4299 
11.5
Photometry Standard.
System using standard filter, V and Rc.
Comparison star  Tycho catalog 
Equipment:
Telescope Newton.  0.20-m f/4 + CCD ST5 
 
HJD
V
R 
V-R
  2452905.4229 
11.71
10.81
0.9
 2452947.4375 
12.34
11.25
1.09
Observatory: Guadarrama Observatory, IAU station 458 

 
Identification of TY Sge


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