WDS SLE 257 – Double Star in Pisces

20 seconds with T3 – February 19, 2017

The Washington Double Star Catalog lists this pair as having a position angle of 66 degrees and a separation of 27.2 arc seconds.  Using Astrometrica, I calculate the position of the 8th magnitude star on the right to be [01 21 03.56, 07 36 21.9] and the 13th magnitude star on the left to be [01 21 05.24, 07 36 33.1].  This gives a separation of 27.37 arc seconds, and a position angle of 65.85 degrees.

WDSSLE257
WDS SLE 257 – Double Star in Pisces

WDS STF 132 – Multiple Star System in Pisces

This is identified by the Washington Double Star Catalogue as a five component system.  My observation (60 seconds on T13), however, shows up only four components, the most difficult component being ‘E’, which is close to the primary ‘A’, only 14 arc seconds, and therefore is washed out by the image of ‘A’ in my image.

I measure the four components as follows:

  • A: ’01h32m03.25s’,’16d56m49.2s’
  • B: ’01h32m01.85s’,’16d57m47.7s’
  • C: ’01h31m58.87s’,’16d56m22.3s’
  • D: ’01h32m10.79s’,’16d56m10.0s’

This gives the following:

  • AB – separation = 61.85 arc seconds, position angle =  341.0
  • AC – separation = 68.36 arc seconds, position angle =  246.8
  • AD – separation = 115.07 arc seconds, position angle = 109.9

These measurements are consistent with the information in the WDS

Calibrated-Color-T13-paulsoper-2017-07-23-00007-Iris-20170723-045241-Color-BIN1-E-060-001
WDS STF 132 – in upper left
STF132
WDS STF 132, with components labeled