AK Pictoris
Star system in the constellation Pictor / From Wikipedia, the free encyclopedia
AK Pictoris is a star system in the constellation Pictor. Its combined apparent magnitude is 6.182.[2] Based on the system's parallax, it is located 69 light-years (21.3 parsecs) away.[1] AK Pictoris is a member of the AB Doradus moving group,[9] a group of stars with similar motions that are thought to be associated.
Quick Facts Constellation, Right ascension ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Pictor |
Right ascension | 06h 38m 00.36576s[1] |
Declination | −61° 32′ 00.1941″[1] |
Apparent magnitude (V) | 6.182[2] (6.32 / 8.77)[3] |
Characteristics | |
Spectral type | G2 + K5:[4] |
B−V color index | +0.62[5] |
Variable type | BY Dra[6] |
Astrometry | |
Radial velocity (Rv) | 32.10 ± 0.5[7] km/s |
Proper motion (μ) | RA: -47.84[1] mas/yr Dec.: 72.73[1] mas/yr |
Parallax (π) | 46.96 ± 0.81 mas[1] |
Distance | 69 ± 1 ly (21.3 ± 0.4 pc) |
Absolute magnitude (MV) | 4.63[8] + ? |
Orbit[3] | |
Period (P) | 217.6 yr |
Semi-major axis (a) | 2.004″ |
Eccentricity (e) | 0.336 |
Inclination (i) | 93.9° |
Longitude of the node (Ω) | 91.6° |
Periastron epoch (T) | 2033.9 |
Argument of periastron (ω) (secondary) | 357.3° |
Details | |
AK Pic A | |
Mass | 1.03[9] M☉ |
Radius | 1.22[9] R☉ |
Luminosity | 1.45[9] L☉ |
Temperature | 5860[4] K |
Rotational velocity (v sin i) | 15.1 ± 0.8[8] km/s |
AK Pic B | |
Luminosity | 0.25[4] L☉ |
Temperature | 4400[4] K |
Rotational velocity (v sin i) | 15.5 ± 2.0[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Close
AK Pictoris is a binary star. Its two stars orbit each other every 217.6 years, separated by 2.004″.[3] The primary star is a G-type star[4] with similar properties to the Sun. The secondary star is a K-type star.[4] The primary star is a young BY Draconis variable,[6] a class of variable stars that derive their variability from stellar rotation. It is also known to host a debris disk, inferred from its infrared excess.[9]