On the 4th of December 2013 Japan Post launched the fourth issue of Constellation series, which aims to promote both fields of letter culture and natural science.
The stamps depict ten signs of constellation often seen in winter: Aries, Taurus, Gemini, Orion, Auriga, Canis Major, Procyon, Lepus, Monoceros and Tsuzumiboshi ( Orion).
Additional information Constellation set
Designer: Hoshiyama Ayaka
Issued in a sheet of 10 self-adhesive stamps.
Stamp postage value: 80 Yen
Circulation: 4 4 million sheets
Date of issue: 4-12-2013
(6): Canis Major
Have a look at all Astronomy stamps issued by Japan here.