Sirius (star)

Sirius A
Spectral	A1 V
Type	Main Sequence
Multiple	Binary
Luminosity	25.4 LSol
Absolute magnitude	1.42
Mag Terra	−1.47
Temperature	9,940° K
Mass	2.02 MSol
Radius	1.711 RSol
Companion	Sirius B

Sirius B (WD 0642-166)
Spectral	DA2
Type	White Dwarf (Degenerate Dwarf)
Multiple	Companion
Luminosity	0.056 LSol
Absolute magnitude	11.18
Mag Terra	8.44
Temperature	25,200° K
Mass	0.978 MSol
Radius	0.0084 RSol

The star Sirius (otherwise known as Alshira or Alpha Canis Majoris) is a blue-white main sequence star of spectral type A1 with a blue-white degenerate dwarf companion of spectral type DA2.

Description (Specifications)

The Sirius system is a binary star system. The primary (Sirius A) is an main sequence star of spectral classification A1 V orbited by a companion degenerate dwarf (Sirius B) of spectral type DA2 in a moderately eccentric orbit (e=0.59) at a distance of about 8.2AU (at periastron) to 31.5AU (at apastron) with a period of about 50.1 years.

• Sirius A has a mass about 2.0 M_Sol.
• A typical degenerate dwarf has a mass equal to 0.5–0.6 M_Sol. With a mass nearly equal to that of Sol, Sirius B is one of the more massive degenerate dwarfs known. During its main sequence lifetime, Sirius B had an estimated mass of 5 M_Sol and was a B-type star (roughly B4-5).
• When it passed through the red giant stage, Sirius B may have enriched the metallicity of Sirius A. For this reason Sirius A now has a higher than normal abundance of elements heavier than helium, such as iron.
• The Sirius star system emits a higher than expected level of infrared radiation. This may be an indication of dust in the system, and is considered somewhat unusual for a binary star.

Sirius is the brightest star in the night-time sky of Terra with a visual apparent magnitude of −1.47. This owes more to its proximity (2.6 parsecs) than its brightness, as its absolute magnitude is a unremarkable 1.42.

The Sirius star system lies approximately 2.6pc from Terra, and is located in a Rimward/Rimtrailing direction from Terra at bearing 227.2^o Galactic Longitude and -08.9^o South Galactic Latitude.

History & Background (Dossier)

Sirius is the primary star of the beltworld Sirius/Dingir (Solomani Rim 1629).

Image Repository

TravellerMap (T5SS):
[1]

References & Contributors (Sources)

This article has metadata.

This page uses content from Wikipedia. The original article was at Sirius. The list of authors can be seen in the page history. The text of Wikipedia is available under the Commons Attribution-ShareAlike 3.0 Unported License.

This list of sources was used by the Traveller Wiki Editorial Team and individual contributors to compose this article. Copyrighted material is used under license from Far Future Enterprises or by permission of the author. The page history lists all of the contributions.

• Marc Miller. Characters and Combat (Game Designers Workshop, 1977), 6.Marc Miller, Robert Eaglestone, Don McKinney. Characters and Combat (Far Future Enterprises, 2019), 6.
• Classic Traveller: Solomani (Alien Module)
• GURPS Traveller: Interstellar Wars
• GURPS Traveller: Rim of Fire
• Mongoose Traveller: Solomani Rim
• Mongoose Traveller Alien Module 5: Solomani
• EXTERNAL LINK: SIMBAD @ University of Strasbourg: [2]
• EXTERNAL LINK: STARS (University of Illinois - Prof. Jim Kaler): [3]
• Author & Contributor: Lord & Chief Marshall (Count) Dan Corrin of the Office of the Emperor
• Author & Contributor: WHULorigan