Gamma Pictoris

Gamma Pictoris, Latinised from γ Pictoris, is a single,^[7] orange-hued star in the southern constellation of Pictor. It is a faintly visible to the naked eye with an apparent visual magnitude of 4.50.^[2] Based upon an annual parallax shift of 17.58 mas as seen from Earth,^[1] this star is located about 185 light-years from the Sun. It is moving away from the Sun with a radial velocity of +17.29 km/s.^[1]

γ Pictoris

Location of γ Pictoris (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pictor
Right ascension	05h 49m 49.66006s[1]
Declination	−56° 09′ 59.9978″[1]
Apparent magnitude (V)	4.50[2]
Characteristics
Evolutionary stage	Red clump[3]
Spectral type	K1 III[4]
U−B color index	+0.98[5]
B−V color index	+1.10[5]
Astrometry
Radial velocity (Rv)	17.29±0.18[1] km/s
Proper motion (μ)	RA: +82.36 mas/yr[1] Dec.: −72.85 mas/yr[1]
Parallax (π)	17.5764 ± 0.1536 mas[1]
Distance	186 ± 2 ly (56.9 ± 0.5 pc)
Absolute magnitude (MV)	0.83[2]
Details[3]
Mass	1.47±0.06 M☉
Radius	11.22±0.08 R☉
Luminosity	53.46±0.75 L☉
Surface gravity (log g)	2.56±0.22 cgs
Temperature	4,670±40 K
Metallicity [Fe/H]	0.15±0.20 dex
Rotational velocity (v sin i)	6.4[6] km/s
Age	3.09±0.16 Gyr
Other designations
γ Pic, CPD−56° 946, FK5 1156, GC 7353, HD 39523, HIP 27530, HR 2042, SAO 234154
Database references
SIMBAD	data

This is an evolved K-type giant star with a stellar classification of K1 III.^[4] It has 1.5 times the mass of the Sun, while its diameter has been measured using interferometry as around 11 times that of the Sun. The star is radiating 53 times the Sun's luminosity from its enlarged photosphere at an effective temperature of around 4,670 K.^[3]

References

1. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
2. Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644. Vizier catalog entry
3. Gallenne, A.; Pietrzyński, G.; Graczyk, D.; Nardetto, N.; Mérand, A.; Kervella, P.; Gieren, W.; Villanova, S.; Mennickent, R. E.; Pilecki, B. (2018-08-01), "Fundamental properties of red-clump stars from long-baseline H-band interferometry", Astronomy & Astrophysics, 616: A68, arXiv:1806.09572, Bibcode:2018A&A...616A..68G, doi:10.1051/0004-6361/201833341, ISSN 0004-6361
4. Hoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H. 5050. Bibcode:1995yCat.5050....0H.
5. Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42 (2): 443. Bibcode:2014JAVSO..42..443M.Vizier catalog entry
6. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. S2CID 54046583. Vizier catalog entry
7. Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.