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Beta Canis Majoris (β Canis Majoris, abbreviated Beta CMa, β CMa), also named Mirzam / ˈ m ɜːr z əm /, [13] is a star in the southern constellation of Canis Major, the "Great Dog", located at a distance of about 500 light-years (150 parsecs) from the Sun. [1] In the modern constellation it lies at the position of the dog's front leg.
The latest brown dwarf proposed for the Y spectral type, WISE 1828+2650, is a > Y2 dwarf with an effective temperature originally estimated around 300 K, the temperature of the human body. [ 102 ] [ 103 ] [ 110 ] Parallax measurements have, however, since shown that its luminosity is inconsistent with it being colder than ~400 K.
A cool star, it has a surface temperature of around 2,900 K and a radius 234 times that of the Sun, its distance estimated at 1,444–1,450 light-years from Earth. [68] At the other extreme in size is RX J0720.4-3125 , a neutron star with a radius of around 5 km. [ 69 ] Exceedingly faint, it has an apparent magnitude of 26.6. [ 70 ]
Its name means "before the dog" or "preceding the dog" in Greek, as it rises an hour before the "Dog Star", Sirius, of Canis Major. It is a binary star system, consisting of a yellow-white main-sequence star [ 30 ] of spectral type F5 IV-V, named Procyon A, and a faint white dwarf companion of spectral type DA, named Procyon B. Procyon B, which ...
Epsilon Canis Majoris is a binary star system and the second-brightest star in the constellation of Canis Major. Its name is a Bayer designation that is Latinised from ε Canis Majoris, and abbreviated Epsilon CMa or ε CMa. This is the 22nd-brightest star in the night sky with an apparent magnitude of 1.50.
Larger breeds and dogs with thicker coats will be able to tolerate temperatures slightly lower - down to about 24°F. Any time it is colder than 20°F, all dogs are at risk of serious health issues.
In astronomy, the color index is a simple numerical expression that determines the color of an object, which in the case of a star gives its temperature. The lower the color index, the more blue (or hotter) the object is. Conversely, the larger the color index, the more red (or cooler) the object is.
A peculiar characteristic of this form of the H–R diagram is that the temperatures are plotted from high temperature to low temperature, which aids in comparing this form of the H–R diagram with the observational form. Although the two types of diagrams are similar, astronomers make a sharp distinction between the two.