Observation data Epoch J2000.0 Equinox J2000.0 ( ICRS) | |
---|---|
Constellation | Norma |
Right ascension | 16h 27m 11.03611s [1] |
Declination | −47° 33′ 17.2226″ [1] |
Apparent magnitude (V) | 4.47 [2] |
Characteristics | |
Spectral type | B4 V + B4 V + B9 V [3] |
U−B color index | −0.54 [2] |
B−V color index | −0.07 [2] |
Astrometry | |
Radial velocity (Rv) | −12.5±2.7 [4] km/s |
Proper motion (μ) |
RA: −13.68±0.27
[1]
mas/
yr Dec.: −19.89±0.20 [1] mas/ yr |
Parallax (π) | 6.15 ± 0.28 mas [1] |
Distance | 530 ± 20
ly (163 ± 7 pc) |
Absolute magnitude (MV) | 0.06 [5] |
Orbit [6] | |
Period (P) | 3.2617 d |
Eccentricity (e) | 0.13 |
Periastron epoch (T) | 2438825.9310 JD |
Argument of periastron (ω) (secondary) | 271.5° |
Semi-amplitude (K1) (primary) | 122.5 km/s |
Semi-amplitude (K2) (secondary) | 132.9 km/s |
Details | |
Mass | 6.4±0.2 [7] M☉ |
Luminosity | 474 [8] L☉ |
Temperature | 10,888 [8] K |
Age | 50.1±14.0 [7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Epsilon Normae, Latinised from ε Normae, is a blue-white hued triple star [3] system in the southern constellation of Norma. It has an apparent visual magnitude of 4.47, [2] which is bright enough to be seen with the naked eye. Based upon an annual parallax shift of 6.15 mas as seen from Earth, [1] the system is located around 530 light years distant from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.21 due to interstellar dust. [5]
The inner pair form a double-lined spectroscopic binary [10] system with an orbital period of 3.26 days and an eccentricity of 0.13. [6] Both stars appear to be similar B-type main-sequence stars with stellar classifications of B4 V. [3] The third component has an angular separation of 22.8 arc seconds from the inner pair, and most likely is a smaller B-type main sequence star of spectral type B9V. [3] The system is relatively young, with an estimated age of around 50 million years. [7]
{{
cite web}}
: CS1 maint: postscript (
link)