| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Ara |
| Right ascension | 17h 50m 28.3927s |
| Declination | -53° 36′ 44.662″ |
| Apparent magnitude (V) | 5.92 |
| Characteristics | |
| Spectral type | B2/B3Vnn |
| U−B color index | -0.64 |
| B−V color index | -0.08 |
| Variable type | Algol variable |
| Astrometry | |
| Radial velocity (Rv) | -8 km/s |
| Proper motion (μ) | RA: 2.43 mas/yr Dec.: -10.42 mas/yr |
| Parallax (π) | 3.96 ± 0.94 mas |
| Distance | approx. 800 ly (approx. 250 pc) |
| Absolute magnitude (MV) | 5.84 |
| Details | |
| Mass | 18 M☉ |
| Radius | 7 R☉ |
| Luminosity | 2,33588 L☉ |
| Temperature | 10,000–30,000 K |
| Rotation | 91 Km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
|
| Database references | |
| SIMBAD | data |
Nu1 Arae (ν1 Arae / ν1 Ara) is a triple star system in the constellation of Ara, and approximately 800 light years from the Earth.
The primary component, ν1 Arae A, is detached blue-white B-type main sequence star. The secondary component, ν1 Arae B, is the 9th magnitude. The spectroscopic companion is also blue-white B-type main sequence star. The angular distance of this pair with a separation of 12.3 arcseconds. The mean brightness of the system is 5.67m.
ν1 Arae A itself an spectroscopic eclipsing binary of which both components are which do not fill their Roche lobes. ν1 Arae is an Algol type eclipsing variable star, designated V539 Arae, and its brightness varies from 5.66m to 6.18m with a period equal to the orbital period of the binary, which is 3.17 days.[1]
The system is sometimes referred as Upsilon1 Arae (υ1 Arae), and more generally unlettered.[1]
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