WR 30a information

WR 30a
	Location of WR 30a (circled in red)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Carina
Right ascension	10h 51m 38.906s
Declination	−60° 56′ 34.91″
Apparent magnitude (V)	12.73
Characteristics
Evolutionary stage	Wolf–Rayet star
Spectral type	WO4 + O5((f))
U−B color index	−0.22
B−V color index	+1.04
Variable type	WR
Astrometry
Proper motion (μ)	RA: −5.642 mas/yr ; Dec.: 2.842 mas/yr
Parallax (π)	0.1201 ± 0.0099 mas
Distance	6,720+1,400; −1,090 pc
Absolute magnitude (MV)	−5.39 (−2.80 + −5.38)
Orbit
Primary	WR
Companion	O
Period (P)	4.619 days
Semi-major axis (a)	35.4 R☉
Eccentricity (e)	0.2
Inclination (i)	20 ± 5°
Semi-amplitude (K1); (primary)	189 km/s
Semi-amplitude (K2); (secondary)	25 km/s
Details
WR
Mass	7.5-9.7 M☉
Radius	0.88 R☉
Luminosity	195,000 L☉
Temperature	129,500 K
O
Mass	40-60 M☉
Other designations
	WR 29a, V574 Carinae, GSC 08958-04143, MS4
Database references
SIMBAD	data

WR 30a is a massive spectroscopic binary in the Milky Way galaxy, in the constellation Carina. The primary is an extremely rare star on the WO oxygen sequence and the secondary a massive class O star. It appears near the Carina Nebula but is much further away.

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Observation data Epoch J2000.0 Equinox J2000.0
Location of WR 30a (circled in red)
Constellation	Carina
Right ascension	10^h 51^m 38.906^s^[1]
Declination	−60° 56′ 34.91″^[1]
Apparent magnitude (V)	12.73^[2]
Characteristics
Evolutionary stage	Wolf–Rayet star
Spectral type	WO4 + O5((f))^[3]
U−B color index	−0.22^[4]
B−V color index	+1.04^[4]
Variable type	WR^[2]
Astrometry

Proper motion (μ)	RA: −5.642^[1] mas/yr Dec.: 2.842^[1] mas/yr
Parallax (π)	0.1201 ± 0.0099 mas^[1]
Distance	6,720+1,400 −1,090^[5] pc
Absolute magnitude (M_V)	−5.39^[6] (−2.80 + −5.38)

Orbit
Primary	WR
Companion	O
Period (P)	4.619 days^[7]
Semi-major axis (a)	35.4 `R`_☉^[8]
Eccentricity (e)	0.2^[8]
Inclination (i)	20 ± 5^[8]°
Semi-amplitude (K₁) (primary)	189^[4] km/s
Semi-amplitude (K₂) (secondary)	25^[8] km/s
Details
WR
Mass	7.5-9.7^[8] `M`_☉
Radius	0.88^[a] `R`_☉
Luminosity	195,000^[9] `L`_☉
Temperature	129,500^[9] K
O
Mass	40-60^[8] `M`_☉
Other designations
WR 29a, V574 Carinae, GSC 08958-04143, MS4
Database references
SIMBAD	data

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