AK Pictoris

AK Pictoris is a star system in the constellation Pictor. Its combined apparent magnitude is 6.182. Based on the system's parallax, it is located 69 light-years (21.3 parsecs) away. AK Pictoris is a member of the AB Doradus moving group, a group of stars with similar motions that are thought to be associated.

AK Pictoris
Observation data
Epoch J2000      Equinox J2000
Constellation Pictor
Right ascension 06h 38m 00.36576s
Declination −61° 32′ 00.1941″
Apparent magnitude (V) 6.182
(6.32 / 8.77)
Characteristics
Spectral type G2 + K5:
B−V color index +0.62
Variable type BY Dra
Astrometry
Radial velocity (Rv)32.10 ± 0.5 km/s
Proper motion (μ) RA: -47.84 mas/yr
Dec.: 72.73 mas/yr
Parallax (π)46.96 ± 0.81 mas
Distance69 ± 1 ly
(21.3 ± 0.4 pc)
Absolute magnitude (MV)4.63 + ?
Orbit
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
Mass1.03 M☉
Radius1.22 R☉
Luminosity1.45 L☉
Temperature5860 K
Rotational velocity (v sin i)15.1 ± 0.8 km/s
AK Pic B
Luminosity0.25 L☉
Temperature4400 K
Rotational velocity (v sin i)15.5 ± 2.0 km/s
Other designations
CD−61° 1428, GJ 3400, HD 48189, HIP 31711, HR 2468, SAO 249604
Database references
SIMBADdata

AK Pictoris is a binary star. Its two stars orbit each other every 217.6 years, separated by 2.004″. The primary star is a G-type star with similar properties to the Sun. The secondary star is a K-type star. The primary star is a young BY Draconis variable, 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.

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