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Barnard's Star


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About this observation
Paul Leyland
Time of observation
11/09/2020 - 18:00
Barnard's Star
Observing location
Tacande Observatory, MPC J22
0.4m Dilworth-Relay
SX Trius Pro 814
No filter

Series of images of Barnard's star were taken on 2019-08-30 and 2020-08-13 at a variety of exposure times and plate scales.  The two best from 2019 and three best from 2020 were measured in Astrometrica against the Gaia DR2 catalogue.

The mean position in 2019 was 17:57:47.40, +04:44:59.8 and in 2020 it was 17:57:47.34, +04:45:10.0 with estimated errors of 0.3 arcseconds in each measurement. The motion is thus -0.9" in RA and +10.2" in Dec over a period of 349 days.  The corresponding figures in Gaia DR2, scaled by a factor of 349/365, are -0.77" and 9.91".  Agreement is acceptable.

Simple arithmetic produces a measured annual proper motion of 10.7 seconds of arc per annum in PA 355.0 degrees.

(Added in edit:

Something went wrong. I tried to upload an animated GIF which shows the proper motion very clearly. Only one of the two appears on this page.  For the time being it can be found at and it will appear on in due course.


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