Observation data Epoch J2000 Equinox J2000 | |
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Constellation | Pictor |
Right ascension | 06h 22m 55.82671s[1] |
Declination | −56° 22′ 11.8909″[1] |
Apparent magnitude (V) | 5.60[2] |
Characteristics | |
Spectral type | A1mA3-A9[3] |
U−B color index | 0.12[4] |
B−V color index | 0.26[4] |
Astrometry | |
Radial velocity (Rv) | +6.7±2.9[2] km/s |
Proper motion (μ) | RA: −39.96[1] mas/yr Dec.: −20.13[1] mas/yr |
Parallax (π) | 20.72 ± 0.56 mas[1] |
Distance | 157 ± 4 ly (48 ± 1 pc) |
Absolute magnitude (MV) | +2.18[2] |
Orbit[5] | |
Period (P) | 452+13 −16 d |
Semi-major axis (a) | 5.9+1.6 −0.9 mas |
Eccentricity (e) | 0.20+0.35 −0.19 |
Inclination (i) | 116+12 −10° |
Longitude of the node (Ω) | 53+166 −16° |
Periastron epoch (T) | 2448660 |
Argument of periastron (ω) (secondary) | 109±53° |
Details | |
Radius | 2.19+0.12 −0.10[6] R☉ |
Luminosity | 15.4±0.4[6] L☉ |
Temperature | 7,733+170 −203[6] K |
Other designations | |
Database references | |
SIMBAD | data |
ν Pictoris, Latinized as Nu Pictoris, is a binary star system in the southern Pictor constellation. It is visible to the naked eye as a dim point of light with an apparent visual magnitude of 5.60.[2] The system is located around 157 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +7 km/s.[2]
Hipparcos satellite astrometry showed that ν Pictoris moved in a way that was not consistent with the proper motion and annual parallax of a single star. The unusual measurements were not readily identifiable as being due to orbital motion, and it was referred to as having a stochastic solution to its astrometry. Later analysis derived an orbit, although nothing is known about the companion except its approximate mass and motion about the visible star.[5]
The pair orbit each other with a period of 452 days and an eccentricity of 0.2.[5] The primary, component A, is a metal-lined Am star with a stellar classification of A1mA3-A9.[3] It has 2.2 times the radius of the Sun and is radiating 15 times the Sun's luminosity from its photosphere at an effective temperature of 7,733 K.[6] The secondary, component B, has around one fourth the mass of the primary.[8][5] The system is a source for X-ray emission, which is most likely coming from the companion.[9]
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