Epsilon Carinae information

ε Carinae
	Location of ε Carinae (circled in red)
Observation data; Epoch J2000 Equinox J2000
Constellation	Carina
Right ascension	08h 22m 30.83526s
Declination	−59° 30′ 34.1431″
Apparent magnitude (V)	1.86 (2.166/4.121)
Characteristics
Spectral type	K3 III + B2 Vp
U−B color index	+0.19
B−V color index	+1.27
Variable type	Eclipsing (suspected)
Astrometry
Radial velocity (Rv)	+11.6 km/s
Proper motion (μ)	RA: –25.52 mas/yr ; Dec.: 22.72 mas/yr
Parallax (π)	5.39 ± 0.42 mas
Distance	610 ± 50 ly ; (190 ± 10 pc)
Absolute magnitude (MV)	−4.47 (−4.3, −1.8, −1.7)
Details
ε Car A
Mass	9±0.9 M☉
Radius	223 R☉
Luminosity	14,086 L☉
Temperature	4,209 K
Age	31.2 ± 10.1 Myr
ε Car B
Mass	7.30 M☉
Temperature	20,417 K
Age	20 Myr
Other designations
	Avior, CD−59°1032, FK5 315, HIP 41037, HR 3307, SAO 235932
	A: HD 71129
	B: HD 71130
Database references
SIMBAD	ε Carinae
	A
	B

Epsilon Carinae (ε Carinae, abbreviated Epsilon Car, ε Car), officially named Avior /ˈeɪvjər/,^[12] is a binary star in the southern constellation of Carina. At apparent magnitude +1.86 it is one of the brightest stars in the night sky, but is not visible from most of the northern hemisphere. The False Cross is an asterism formed of Delta Velorum, Kappa Velorum, Iota Carinae and ε Carinae. It is so called because it is sometimes mistaken for the Southern Cross, causing errors in astronavigation.^[13]

Epsilon Carinae is located roughly 560–660 light-years (170–200 parsecs) from the Sun.^[1] Measurements during the Hipparcos mission give the pair an angular separation of 0.46 arcseconds with a difference in magnitude of 2.0.^[5] At their estimated distance, this angle is equivalent to a physical separation of around 4 astronomical units.^[14]

The primary component has an apparent visual magnitude of 2.2,^[3] which by itself would still make it the third-brightest star in the constellation. It is an evolved giant star with a stellar classification of K0 III. However, examination of the ultraviolet flux from this star suggests it may instead be of spectral type K7.^[5] The fainter secondary companion has an apparent visual magnitude of 4.1,^[3] which, if it were a solitary star, would be bright enough to be seen with the naked eye. This is a hot, core hydrogen-fusing B-type main sequence star of spectral class B2 Vp.^[5] The secondary may itself have an orbiting stellar companion of spectral class F8.^[9] This pair may form an eclipsing binary system^[14] with a period of 785 days (2.15 years), resulting in a magnitude change of 0.12 during each eclipse.^[6]^[15]

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^ "IAU Catalog of Star Names". Retrieved 28 July 2016.
^ Moore, Patrick (2010). Patrick Moore's Astronomy: Teach Yourself. Hachette. ISBN 978-1444129779.
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[IAU-CSN-13] "IAU Catalog of Star Names". Retrieved 28 July 2016.

[14] Moore, Patrick (2010). Patrick Moore's Astronomy: Teach Yourself. Hachette. ISBN 978-1444129779.

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Observation data Epoch J2000 Equinox J2000
Location of ε Carinae (circled in red)
Constellation	Carina
Right ascension	08^h 22^m 30.83526^s^[1]
Declination	−59° 30′ 34.1431″^[1]
Apparent magnitude (V)	1.86^[2] (2.166/4.121)^[3]
Characteristics
Spectral type	K3 III^[4] + B2 Vp^[5]
U−B color index	+0.19^[2]
B−V color index	+1.27^[2]
Variable type	Eclipsing (suspected)^[6]
Astrometry

Radial velocity (R_v)	+11.6^[7] km/s
Proper motion (μ)	RA: –25.52^[1] mas/yr Dec.: 22.72^[1] mas/yr
Parallax (π)	5.39 ± 0.42 mas^[1]
Distance	610 ± 50 ly (190 ± 10 pc)
Absolute magnitude (M_V)	−4.47^[8] (−4.3, −1.8, −1.7)^[9]

Details
ε Car A
Mass	9±0.9^[10] `M`_☉
Radius	223^[11]^[a] `R`_☉
Luminosity	14,086^[11] `L`_☉
Temperature	4,209^[11] K
Age	31.2 ± 10.1^[10] Myr
ε Car B
Mass	7.30^[9] `M`_☉
Temperature	20,417^[9] K
Age	20^[9] Myr
Other designations
Avior, CD−59°1032, FK5 315, HIP 41037, HR 3307, SAO 235932
A: HD 71129
B: HD 71130
Database references
SIMBAD	ε Carinae
	A
	B

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