Theta Carinae, a blue main-sequence star in Carina
Theta Carinae is a blue main-sequence star in the constellation Carina. At 479 light years away, it is the 121st brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.74.
Theta Carinae (HIP 52419)
Theta Carinae is a blue main-sequence star in the constellation Carina. At 479 light years away, it is the 121st brightest star in the Earth's sky, where it shines at an apparent visual magnitude of 2.74. Theta Carinae is the primary component of a multiple-star system. It is moving through the Galaxy at a speed of 25.2 km/s relative to the Sun and is part of the Southern Pleiades moving group. Its projected Galactic orbit carries it between 19,700 and 24,200 light years from the center of the Galaxy. It came closest to the Sun 4.5 million years ago when it had brightened to magnitude 1.66 from a distance of 291 light years.
Sky position: RA 10h 43.0m, Dec -64° 23.4'
Common designations: Theta Carinae, HIP 52419, HD 93030
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Brightest stars in Carina:
(list all)
1
| -0.62
) Canopus
| Rank | Mag. | Star |
| 2 | 1.67 | Miaplacidus |
| 3 | 1.86 | Avior |
| 4 | 2.21 | Tureis |
5
| 2.74
) Theta Carinae
| Rank | Mag. | Star |
| 6 | 2.92 | Upsilon Carinae |
| 7 | 3.29 | Omega Carinae |
| 8 | 3.30 | p Carinae |
| 9 | 3.39 | q Carinae |
| 10 | 3.43 | a Carinae |
| 11 | 3.46 | chi Carinae |
| 12 | 3.69 | l Carinae |
| 13 | 3.78 | u Carinae |
| 14 | 3.81 | s Carinae |
| 15 | 3.84 | c Carinae |
| 16 | 3.93 | x Carinae |
| 17 | 3.96 | i Carinae |
Galactic Orbit of Theta Carinae
(compared to the Sun)
E
ccentricity: 10.5% vs. 16.0%Angle φ : 154.6°vs. 26.0°
Semi-major axis : 6,732 pc vs. 8,686 pc
Semi-minor axis: 6,695 pc vs. 8,574 pc
Focus-to-center
: 703 pcvs. 1,388 pcSemilatus rectum : 6,658 pc vs. 8,464 pc
Perigalacticon: 6,028 pc vs. 7,297 pc
Apogalacticon
: 7,435 pcvs. 10,074 pcSome Tabulated XHIP Data for Theta Carinae
(see also: SIMBAD)
Astrometry
2007A&A...474..653V
| Position | Proper Motion | |
| Right Ascension: | 160.73927812° ±0.17 mas | -18.36 ±0.23 mas/yr. |
| Declination: | -64.39447946° ±0.17 mas | 12.03 ±0.18 mas/yr. |
| Galactic Longitude: | 289.59784493° | -21.87 mas/yr. |
| Galactic Latitude: | -4.90172194° | 1.87 mas/yr. |
Parallax: 7.16 ± 0.21 mas
Spectrography
Spectral Type: B0.2Vp 1976ApJ...205..419W.
Radial Velocity:
20.00 ±1.00 km/s [A rating]
2004A&A...424..727P.
This star is a spectroscopic binary with a solved orbit.
Iron Abundance [Fe/H]:
n/a
Photometry
band
magnitude
Abs. Mag.
U
1.54
-4.30
B
2.52
-3.32
V
2.74
-3.10
R
I
2.95
-2.89
J
H
K
B-V: -0.22 V-I: -0.21
Derivations
Heliocentric distance: 146.93 pc (fitted to cluster)
Galactocentric distance: 7,352 pc
Transverse velocity: 15.3 km/s
3D heliocentric position and motion:
|
toward: |
Galactic center | Galactic rotation | North Galactic Pole |
| Position ( X, Y, Z) | 49.1 pc | -137.9 pc | -12.6 pc |
| Velocity (U, V, W) | -7.6 km/s | -24.0 km/s | -0.4 km/s |