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Double Star 145 G Canis Majoris, 


            Steven Bellavia

Double Star 145 G Canis Majoris


Double star 145 G Canis Majoris is often called "The Winter Albireo" as the pair have similar colors and similar separation (26.4" vs Albireo at 34.2" ). The name was coined by author and astronomy lecturer, James Mullaney.

Other designations are: HIP 35210 A/B; SAO 173 349/353; HD 56577/8; h3945
Location: RA: 07h 16m 36.8s/38.3s, DEC -23d 18m 56s/39s

This pair was discovered by John Herschel, which is the lower case "h" in h3945. He observed it while on the ship Mount Stewart Elphinstone, on the way to the Cape of Good Hope, sometime between 1833 and 1838. John Hercshel cataloged over 5,500 double stars.

145 G CMa is an optical double, that is, the two stars appear close only by the line of sight. The brighter "A" (mag 5.0) gold / orange star in the pair is a spectral type K0, 6,300 light years distant, and the slightly dimmer "B" (mag 5.9) blue star is spectral type F0, at a much closer distance of 260 light years.

The image attached was taken with a Borg 90mm refractor, and a cooled ZWO ASI183MC color camera, which results in 0.92 arc-sec/pixel. These were on a tracking/guiding Celestron AVX mount. Sixty 5-second exposures were stacked, to reduce background noise.



Steven Bellavia
License: None (All rights reserved)


  • Double Star 145 G Canis Majoris, 


            Steven Bellavia
  • Final
    Double Star 145 G Canis Majoris, 


            Steven Bellavia


Double Star 145 G Canis Majoris, 


            Steven Bellavia