Tenrosei

Template:Starbox character Template:Starbox detail

**Sirius A / B**
Observation data Epoch J2000.0 (ICRS) Equinox J2000.0 (ICRS)
File:Position Alpha Cma.png The position of Sirius
Constellation	Canis Major
Pronunciation	Template:IPA-en^[1]
Right ascension	06^h 45^m 08.9173^s^[2]^[3]
Declination	−16° 42′ 58.017″^[2]^[3]
Apparent magnitude (V)	−1.46 (A)^[2] / 8.30 (B)^[4]
Astrometry

wikipedia:Radial velocity (R_v)	−7.6^[2] km/s
Proper motion (μ)	RA: −546.05^[2]^[3] mas/yr Dec.: −1223.14^[2]^[3] mas/yr
Parallax (π)	379.21 ± 1.58^[2] mas
Distance	Expression error: Unrecognized punctuation character "[". ± Expression error: Unrecognized punctuation character "[". ly (Expression error: Unrecognized punctuation character "[". ± Expression error: Unrecognized punctuation character "[". pc)
Absolute magnitude (M_V)	1.42 (A)^[5] / 11.18 (B)^[4]

Orbit^[6]
Companion	α CMa B
Period (P)	49.9 yr
Semimajor axis (a)	7.56"
Eccentricity (e)	0.592
Inclination (i)	136.5°
Longitude of the node (Ω)	44.6°
Periastron epoch (T)	1894.13
Argument of periastron (ω) (secondary)	147.3°
Other designations
System: Dog Star, Aschere, Canicula, Al Shira, Sothis,^[7] Mrgavyadha, Lubdhaka,^[8] Tenrōsei,^[9] α Canis Majoris (α CMa), 9 Canis Majoris (9 CMa), HD 48915, HR 2491, BD −16°1591, GCTP 1577.00 A/B, GJ 244 A/B, LHS 219, ADS 5423, LTT 2638, HIP 32349. B: EGGR 49, WD 0642-166.^[2]^[10]^[11]

In Chinese astronomy the star is known as the star of the 'celestial wolf' (Chinese and Japanese: 天狼; Chinese romanization: Tiānláng; Japanese romanization: Tenrō;^[12] in the Mansion of Jǐng (井宿).Several cultures also associated the star with a bow and arrows. The Ancient Chinese visualized a large bow and arrow across the southern sky, formed by the constellations of Puppis and Canis Major. In this, the arrow tip is pointed at the wolf Sirius.

↑ "Sirius". Dictionary.com Unabridged (v 1.1). Random House, Inc. Retrieved on 2008-04-06.
↑ ^2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 ^2.7 Cite error: Invalid <ref> tag; no text was provided for refs named simbada
↑ ^3.0 ^3.1 ^3.2 ^3.3 Astrometric data, mirrored by SIMBAD from the Hipparcos catalogue, pertains to the center of mass of the Sirius system. See §2.3.4, Volume 1, The Hipparcos and Tycho Catalogues, European Space Agency, 1997, and the entry for Sirius in the Hipparcos catalogue (CDS ID I/239.)
↑ ^4.0 ^4.1 Entry for WD 0642-166, A Catalogue of Spectroscopically Identified White Dwarfs (August 2006 version), G. P. McCook and E. M. Sion (CDS ID III/235A.)
↑ For apparent magnitude m and parallax π, the absolute magnitude M_v of Sirius A is given by:
${\begin{smallmatrix}M_{v}\ =\ m+5(\log _{10}{\pi }+1)\ =\ -1.47+5(\log _{10}{0.37921}+1)\ =\ 1.42\end{smallmatrix}}$
See: Tayler, Roger John (1994). The Stars: Their Structure and Evolution. Cambridge University Press. p. 16. Template:ISBN.
↑ Template:Cite journal (p. 195.)
↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen1899
↑ Singh, Nagendra Kumar (2002). Encyclopaedia of Hinduism, A Continuing Series. Anmol Publications PVT. LTD. p. 794. Template:ISBN.
↑ Spahn, Mark; Hadamitzky, Wolfgang; Fujie-Winter, Kimiko (1996). The Kanji dictionary. Tuttle Publishing. p. 724. Template:ISBN.
↑ Database entry for Sirius B, SIMBAD. Accessed on line October 23, 2007.
↑ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The general catalogue of trigonometric parallaxes (4th ed.). Yale University Observatory. (CDS ID I/238A.
↑ Template:Harvard citation

[1] "Sirius". Dictionary.com Unabridged (v 1.1). Random House, Inc. Retrieved on 2008-04-06.

[simbada-2] 2.0 ^2.1 ^2.2 ^2.3 ^2.4 ^2.5 ^2.6 ^2.7 Cite error: Invalid <ref> tag; no text was provided for refs named simbada

[cg-3] 3.0 ^3.1 ^3.2 ^3.3 Astrometric data, mirrored by SIMBAD from the Hipparcos catalogue, pertains to the center of mass of the Sirius system. See §2.3.4, Volume 1, The Hipparcos and Tycho Catalogues, European Space Agency, 1997, and the entry for Sirius in the Hipparcos catalogue (CDS ID I/239.)

[wd42166-4] 4.0 ^4.1 Entry for WD 0642-166, A Catalogue of Spectroscopically Identified White Dwarfs (August 2006 version), G. P. McCook and E. M. Sion (CDS ID III/235A.)

[co-5] For apparent magnitude m and parallax π, the absolute magnitude M_v of Sirius A is given by:
${\begin{smallmatrix}M_{v}\ =\ m+5(\log _{10}{\pi }+1)\ =\ -1.47+5(\log _{10}{0.37921}+1)\ =\ 1.42\end{smallmatrix}}$
See: Tayler, Roger John (1994). The Stars: Their Structure and Evolution. Cambridge University Press. p. 16. Template:ISBN.

[gatewood-6] Template:Cite journal (p. 195.)

[Allen1899-7] Cite error: Invalid <ref> tag; no text was provided for refs named Allen1899

[8] Singh, Nagendra Kumar (2002). Encyclopaedia of Hinduism, A Continuing Series. Anmol Publications PVT. LTD. p. 794. Template:ISBN.

[9] Spahn, Mark; Hadamitzky, Wolfgang; Fujie-Winter, Kimiko (1996). The Kanji dictionary. Tuttle Publishing. p. 724. Template:ISBN.

[simbadb-10] Database entry for Sirius B, SIMBAD. Accessed on line October 23, 2007.

[11] van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The general catalogue of trigonometric parallaxes (4th ed.). Yale University Observatory. (CDS ID I/238A.

[12] Template:Harvard citation

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