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AK Pictoris

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Jan 8, 2022

AK Pictoris is a star system in the constellationPictor. 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.

Star system in the constellation Pictor

AK Pictoris
Observation data
EpochJ2000      EquinoxJ2000
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[1] mas
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°
Periastronepoch(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
CD−61° 1428, GJ 3400, HD 48189, HIP 31711, HR 2468, SAO 249604[2]
Database references
SIMBAD data

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]

. . . AK Pictoris . . .

  1. van Leeuwen, F.; et al. (2007). “Validation of the new Hipparcos reduction”. Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A…474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
  2. “V* AK Pic”. SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 20 July 2017.
  3. “Sixth Catalog of Orbits of Visual Binary Stars”. United States Naval Observatory. Retrieved 20 July 2017.
  4. McCarthy, Kyle; White, Russel J. (2012). “The Sizes of the Nearest Young Stars”. The Astronomical Journal. 143 (6): 134. arXiv:1201.6600. Bibcode:2012AJ….143..134M. doi:10.1088/0004-6256/143/6/134. S2CID 118538522.
  5. Johnson, H. L. (1966). “UBVRIJKL Photometry of the Bright Stars”. Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL…4…99J.
  6. Samus’, N. N.; Goranskii, V. P.; Durlevich, O. V.; Zharova, A. V.; Kazarovets, E. V.; Kireeva, N. N.; Pastukhova, E. N.; Williams, D. B.; Hazen, M. L. (2003). “An Electronic Version of the Second Volume of the General Catalogue of Variable Stars with Improved Coordinates”. Astronomy Letters. 29 (7): 468. Bibcode:2003AstL…29..468S. doi:10.1134/1.1589864. S2CID 16299532.
  7. Gontcharov, G. A. (2006). “Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system”. Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL…32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  8. Fuhrmann, K.; Chini, R. (2015). “Multiplicity Among F-Type Stars. II”. The Astrophysical Journal. 809 (1): 107. Bibcode:2015ApJ…809..107F. doi:10.1088/0004-637X/809/1/107.
  9. Plavchan, Peter; Werner, M. W.; Chen, C. H.; Stapelfeldt, K. R.; Su, K. Y. L.; Stauffer, J. R.; Song, I. (2009). “New Debris Disks Around Young, Low-Mass Stars Discovered with Thespitzer Space Telescope”. The Astrophysical Journal. 698 (2): 1068–1094. arXiv:0904.0819. Bibcode:2009ApJ…698.1068P. doi:10.1088/0004-637X/698/2/1068. S2CID 51417657.
Stars of Pictor
Bayer
Variable
HR
  • 1498
  • 1667
  • 1727
  • 1742
  • 1813
  • 1856
  • 1860
  • 1912
  • 1984
  • 2008
  • 2023
  • 2032
  • 2044
  • 2049
  • 2072
  • 2089
  • 2094
  • 2114
  • 2117
  • 2138
  • 2196
  • 2274
  • 2336
  • 2337
  • 2345
  • 2354
  • 2360
  • 2369
  • 2389
  • 2562
HD
Other

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. . . AK Pictoris . . .