Sirius
Curiosities
The Sirius system emits an unexpectedly high amount of IR radiation -- considered unusual for a binary system.
Some ancient observations depict Sirius as being a red star. Astronomically, however, mere thousands of years simply aren't long enough for a red giant to cast off it's outer layers and leave the white dwarf currently present.
Sirius C?
Due to slight perturbations in the orbit of Sirius B, an additional, unseen companion to either Sirius A or Sirius B is suspected. No definitive evidence has been found yet.
Appendix: Stellar Data
Age: 300 Million Years
Metallicity: 190% Sun
Distance from Sun: 8.601 Light Years
Sirius A
Blue/White Main Sequence Dwarf Star
235% Solar Mass
2261% Solar Luminosity
203% Solar Diameter
Surface Temperature: 9900K
Est. Comfort Zone: 4.755 AU
Sirius B
White Dwarf Star
Semimajor axis: 19.78 AU
98% Solar Mass
0.24% Solar Luminosity
2.2% Solar Diameter
Surface Temperature: 25200K
Est. Comfort Zone: 0.0505 AU
Notes: One of the most massive white dwarfs known (comparable in volume to Earth). Has already evolved off the main sequence, and has probably been through a red giant stage.
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