Observation by Leo Aerts: Sirius and the "pup"

Uploaded by

Paul Downing, FRAS

Observer

Leo Aerts

Observed

2018 Oct 10 - 04:00

Uploaded

2019 Feb 09 - 10:32

Objects

Sirius

Equipment
  • Celestron 14” scope at prime focus
  • ZWO ASI 290MM webcam
Location

Heist op den Berg, Belgium

Target name

Sirius

Title

Sirius and the "pup"

About this image

Leo notes that the ‘ key to success’ in observing this close and difficult pair is not transparency, but good seeing conditions.  When the air is calm Sirius B pops up in good contrast to Sirius A.  When seeing deteriorates the companion is not seen.  On October 10th 2018 conditions were perfect.  There was also a reason why he chose the early morning to observe Sirius.  October has warmer night time temperatures than in the middle of winter, and cold night temperature are often disastrous for good seeing conditions.  Sirius also culminated in early October.   Leo used a ZWO AS290 webcam at prime focus at about 5 fps, with a gain of about 80%.  He stacked about 300 images out of 2000.

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