Sunday 31 January 2021

Sirius B


Couldn't resolve it visually with 10mm plossl and 2x Barlow at around 8.30pm, perhaps only when it transits. Sirius B is clearly discernible in a 1 second frame as it gets higher.

The stacked image was heavily stretched in PS to reveal the faint background stars, to correct for the offset in position angle by rotating the image. Eventually, Sirius B is measured to be 64.5 degrees from north approximately, which is a 1.8 degree offset from 66.3 degrees obtained from Skysafari. The distance from Sirius A to Sirius B is 13" from the image, compared to 11.2", so about 3.5 pixels off.

Equipment: Skywatcher 150/750, ASI120MC, 2x Barlow, EQ3 Pro
Settings: 300x1s
Software: Registax, PS