Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Carina |
Right ascension | 10h 38m 44.99524s [1] |
Declination | −59° 10′ 58.7927″ [1] |
Apparent magnitude (V) | 4.77 (4.85 + 7.67) [2] |
Characteristics | |
A | |
Spectral type | K4.5Ib-II [3] |
B−V color index | 1.562±0.015 [3] |
B | |
Spectral type | B9II/III [3] |
B−V color index | 0.100±0.020 [3] |
Astrometry | |
A | |
Radial velocity (Rv) | +11.0±0.8 [3] km/s |
Proper motion (μ) |
RA: −14.284±0.338
[1]
mas/
yr Dec.: +1.117±0.329 [1] mas/ yr |
Parallax (π) | 2.0056 ± 0.1809 mas [1] |
Distance | 1,600 ± 100
ly (500 ± 40 pc) |
Absolute magnitude (MV) | −3.66 [3] |
B | |
Proper motion (μ) |
RA: −14.380±0.089
[1]
mas/
yr Dec.: +0.932±0.085 [1] mas/ yr |
Parallax (π) | 2.1854 ± 0.0512 mas [1] |
Distance | 1,490 ± 30
ly (460 ± 10 pc) |
Details | |
A | |
Mass | 11.9±0.2 [4] M☉ |
Radius | 202+5 −6 [1] R☉ |
Luminosity | 8,478±875 [1] L☉ |
Temperature | 3,900+63 −48 [1] K |
Age | 16.4±1.0 [4] Myr |
B | |
Temperature | 8,316+1,256 −1,389 [1] K |
Other designations | |
A: GC 14647, HD 92397, HIP 52102, SAO 238295 [5] | |
B: GC 14649, HD 92398, HIP 52106, SAO 238297 [6] | |
Database references | |
SIMBAD | A |
B |
HR 4177, also called t2 Carinae (t2 Car), is a
double star
[2] in the southern
constellation of
Carina. It is faintly visible to the naked eye with a combined
apparent visual magnitude of +4.77.
[2] The two components are HD 92397 and HD 92398. The primary component is located at a distance of approximately 1,600
light years from the
Sun based on
parallax, and is drifting further away with a
radial velocity of +11 km/s.
[3] It has a
peculiar velocity of 24.3+9.9
−16.1 km/s and may be a
runaway star.
[4] The star is a member of the BH 99 cluster.
[7]
The magnitude 4.85 [2] primary, component A, is a massive K-type supergiant or bright giant with a stellar classification of K4.5Ib-II. [3] Houk (1978) instead listed it with a class of K4/5III: but with some uncertainty about the classification. [8] It has 12 [4] times the mass of the Sun and has expanded to 202 [1] times the Sun's radius. The star is radiating 8,478 [1] times the luminosity of the Sun from its bloated photosphere at an effective temperature of 3,900 K. [1]
The magnitude 7.48 companion star, component B, was discovered by J. Dunlop in 1829. As of 2015, it was located at an angular separation of 14.60 ″ along a position angle of 21°, relative to the primary. [9] It is a B-type giant/ bright giant star with a class of B9II/III. [3] The pair show a common proper motion and roughly similar parallax measurements, [1] but it remains unclear whether they form a gravitationally-bound pair. [2]