AK Pictoris

AK Pictoris is a star system in the constellation Pictor. Its combined apparent magnitude is 6.182.^[3] Based on the system's parallax, it is located 69 light-years (21.3 parsecs) away.^[2] AK Pictoris is a member of the AB Doradus moving group,^[10] a group of stars with similar motions that are thought to be associated.

ConstellationPictor

Right ascension06^h 38^m 00.36576^s[2]

Declination−61° 32′ 00.1941″^[2]

Apparentmagnitude(V)6.182^[3]
(6.32 / 8.77)^[4]

Quick facts Constellation, Right ascension ...

AK Pictoris

A light curve for AK Pictoris, plotted from TESS data.[1]
Observation data Epoch J2000      Equinox ICRS
Constellation	Pictor
Right ascension	06h 38m 00.36576s[2]
Declination	−61° 32′ 00.1941″[2]
Apparent magnitude (V)	6.182[3] (6.32 / 8.77)[4]
Characteristics
Spectral type	G2 + K5:[5]
B−V color index	+0.62[6]
Variable type	BY Dra[7]
Astrometry
Radial velocity (Rv)	32.10 ± 0.5[8] km/s
Proper motion (μ)	RA: -47.84[2] mas/yr Dec.: 72.73[2] mas/yr
Parallax (π)	46.96±0.81 mas[2]
Distance	69 ± 1 ly (21.3 ± 0.4 pc)
Absolute magnitude (MV)	4.63[9] + ?
Orbit[4]
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[10] M☉
Radius	1.22[10] R☉
Luminosity	1.45[10] L☉
Temperature	5860[5] K
Rotational velocity (v sin i)	15.1 ± 0.8[9] km/s
AK Pic B
Luminosity	0.25[5] L☉
Temperature	4400[5] K
Rotational velocity (v sin i)	15.5 ± 2.0[9] km/s
Other designations
CD−61° 1428, GJ 3400, HD 48189, HIP 31711, HR 2468, SAO 249604[3]
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″.^[4] The primary star is a G-type star^[5] with similar properties to the Sun. The secondary star is a K-type star.^[5] The primary star is a young BY Draconis variable,^[7] 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.^[10]