کروان قیران

Sirius
	; The position of Sirius (circled).
Observation data; Epoch J2000.0 Equinox ICRS
اولدوزلار شکیلی	Canis Major
	Sirius (/ˈsɪriəs/) system
Right ascension	06h 45m 08.91728s
Declination	‏ 58.0171″ 42′ ‎−16°
Apparent magnitude (V)	−1.46
	Sirius A
Right ascension	06h 45m 08.917s
Declination	‏ 58.02″ 42′ ‎−16°
Apparent magnitude (V)	−1.47
	Sirius B
Right ascension	06h 45m 09.0s
Declination	‏ 06″ 43′ ‎−16°
Apparent magnitude (V)	8.44
Characteristics
Sirius A
Evolutionary stage	Main sequence
Spectral type	A0mA1 Va
U−B colour index	−0.05
B−V colour index	+0.00
Sirius B
Evolutionary stage	White dwarf
Spectral type	DA2
U−B colour index	−1.04
B−V colour index	−0.03
Astrometry
Radial velocity (Rv)	−5.50 km/s
Proper motion (μ)	RA: −546.01 mas/ایل ; Dec.: −1223.07 mas/ایل
Parallax (π)	379.21 ± 1.58 mas
Distance	شابلون:ErrorBar2 ایشیق ایلی ; (شابلون:ErrorBar2 pc)
Sirius A
Absolute magnitude (MV)	+1.42
Sirius B
Absolute magnitude (MV)	+11.18
Details
α CMa A
Mass	2.063 ± 0.023 M☉
Radius	1.711 شابلون:Solar radius
Luminosity	25.4 شابلون:Solar luminosity
Surface gravity (log g)	4.33 cgs
Temperature	9,940 K
Metallicity [Fe/H]	0.50 dex
Rotation	16 km/s
Age	237–247 ایل
α CMa B
Mass	1.018 ± 0.011 M☉
Radius	0.0084 ± 3% شابلون:Solar radius
Luminosity	0.056 شابلون:Solar luminosity
Surface gravity (log g)	8.57 cgs
Temperature	25,000 ± 200 K
اولدوز	228+10; −8 ایل
Other designations
	Dog Star, Aschere, Canicula, Al Shira, Sothis, Alhabor,Mrgavyadha, Lubdhaka, Tenrōsei, α Canis Majoris (α CMa), 9 Canis Majoris (9 CMa), HD 48915, HR 2491, BD−16°1591, GJ 244, LHS 219, ADS 5423, LTT 2638, HIP 32349
	Sirius B: EGGR 49, WD 0642-166, GCTP 1577.00
Database references
SIMBAD	The system
	A
	B

شابلون:Starbox visbin

کروان قیران یادا گونئی اولدوزو یوخسا شعرای یمانی (اینگیلیسجه: sirius)، گؤیده اولان ان پارلاق اولدوزدور.

قایناق

[۱]

[۲]

[۳]

[۴]

[۵]

[۶]

[۷]

[۸]

[۹]

[۱۰]

[۱۱]

[۱۲]

[۱۳]

[۱۴]

[۱۵]

[۱۶]

[۱۷]

[۱۸]

[۱۹]

[۲۰]

[۲۱]

[۲۲]

[۲۳]

Observation data Epoch J2000.0 Equinox ICRS
The position of Sirius (circled).
اولدوزلار شکیلی	Canis Major
Sirius (/ˈsɪriəs/^[۱]) system
Right ascension	06^h 45^m 08.91728^s^[۲]
Declination	‏ 58.0171″ 42′ ‎−16°^[۲]
Apparent magnitude (V)	−1.46^[۳]
Sirius A
Right ascension	06^h 45^m 08.917^s^[۴]
Declination	‏ 58.02″ 42′ ‎−16°^[۴]
Apparent magnitude (V)	−1.47^[۵]
Sirius B
Right ascension	06^h 45^m 09.0^s^[۶]
Declination	‏ 06″ 43′ ‎−16°^[۶]
Apparent magnitude (V)	8.44^[۵]
Characteristics
Sirius A
Evolutionary stage	Main sequence
Spectral type	A0mA1 Va^[۷]
U−B colour index	−0.05^[۳]
B−V colour index	+0.00^[۳]
Sirius B
Evolutionary stage	White dwarf
Spectral type	DA2^[۵]
U−B colour index	−1.04^[۸]
B−V colour index	−0.03^[۸]
Astrometry

Radial velocity (R_v)	−5.50^[۹] km/s
Proper motion (μ)	RA: −546.01^[۲] mas/ایل Dec.: −1223.07^[۲] mas/ایل
Parallax (π)	379.21 ± 1.58^[۲] mas
Distance	شابلون:ErrorBar2 ایشیق ایلی (شابلون:ErrorBar2 pc)


Sirius A
Absolute magnitude (M_V)	+1.42^[۱۰]


Sirius B
Absolute magnitude (M_V)	+11.18^[۸]

Details
α CMa A
Mass	2.063 ± 0.023^[۱۱] `M`_☉
Radius	1.711^[۱۲] شابلون:Solar radius
Luminosity	25.4^[۱۲] شابلون:Solar luminosity
Surface gravity (log g)	4.33^[۱۳] cgs
Temperature	9,940^[۱۳] K
Metallicity [Fe/H]	0.50^[۱۴] dex
Rotation	16 km/s^[۱۵]
Age	237–247^[۱۱] ایل
α CMa B
Mass	1.018 ± 0.011^[۱۱] `M`_☉
Radius	0.0084 ± 3%^[۱۶] شابلون:Solar radius
Luminosity	0.056^[۱۷] شابلون:Solar luminosity
Surface gravity (log g)	8.57^[۱۶] cgs
Temperature	25,000 ± 200^[۱۲] K
اولدوز	228+10 −8^[۱۱] ایل
Other designations
Dog Star, Aschere, Canicula, Al Shira, Sothis,^[۱۸] Alhabor,^[۱۹]Mrgavyadha, Lubdhaka,^[۲۰] Tenrōsei,^[۲۱] α Canis Majoris (α CMa), 9 Canis Majoris (9 CMa), HD 48915, HR 2491, BD−16°1591, GJ 244, LHS 219, ADS 5423, LTT 2638, HIP 32349^[۲۲]
Sirius B: EGGR 49, WD 0642-166, GCTP 1577.00^[۲۳]
Database references
SIMBAD	The system
	A
	B