Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pavo |
Right ascension | 18h 31m 22.42509s[1] |
Declination | −62° 16′ 41.8853″[1] |
Apparent magnitude (V) | 4.64 (4.60 - 4.64[2]) |
Characteristics | |
Evolutionary stage | main sequence[3] |
Spectral type | B7III[4] |
U−B color index | −0.39[5] |
B−V color index | −0.11[5] |
Variable type | SPB[2] |
Astrometry | |
Radial velocity (Rv) | +16.95[6] km/s |
Proper motion (μ) | RA: −1.11[1] mas/yr Dec.: −45.31[1] mas/yr |
Parallax (π) | 7.43 ± 0.24 mas[1] |
Distance | 440 ± 10 ly (135 ± 4 pc) |
Absolute magnitude (MV) | -1.01[4] |
Orbit[7] | |
Period (P) | 1.711529±0.000005 d |
Eccentricity (e) | 0.0 |
Periastron epoch (T) | 2,450,276.5502±0.0007 HJD |
Argument of periastron (ω) (secondary) | 127±12° |
Semi-amplitude (K1) (primary) | 43.8±0.1 km/s |
Details | |
Mass | 4.39[8] M☉ |
Luminosity | 659[8] L☉ |
Temperature | 12,764[8] K |
Rotational velocity (v sin i) | 125.0[9] km/s |
Other designations | |
Database references | |
SIMBAD | data |
𝜈 Pavonis, Latinized as Nu Pavonis, is a possible triple star system[11] in the southern constellation of Pavo. It is visible to the naked eye as a faint star that varies in apparent visual magnitude from 4.60 to 4.64 over a period of 0.85584 days.[2] The system lies approximately 440 light years from the Sun based on parallax,[1] and is drifting further away with a radial velocity of +17 km/s.[6] It is a possible member of the Wolf 630 group of co-moving stars.[3]
This is a single-lined spectroscopic binary system with an orbital period of just 1.71 days in a circular orbit.[7] The unresolved[3] components are close enough that their tidal interaction is significant.[7] The visible component is a slowly pulsating B-type star with a stellar classification of B7III.[4] This implies it is an evolved giant star, but it is actually more likely to be on the main sequence. An X-ray emission has been detected from the pair.[3]
The third component is a visible companion, probably a pre-main-sequence star, at magnitude 13.7 and separation 3.1″. This star is estimated at 0.15 solar masses and an effective temperature of 3,192 K.[8] It too is an X-ray source.[3]