3 Piscis Austrini

3 Piscis Austrini
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Microscopium
Right ascension	12h 11m 17.33721s[1]
Declination	−23° 36′ 09.6123″[1]
Apparent magnitude (V)	5.41[2]
Characteristics
Evolutionary stage	giant
Spectral type	K3 III[3]
B−V color index	1.425±0.006[2]
Astrometry
Radial velocity (Rv)	−46.2±2.4[2] km/s
Proper motion (μ)	RA: +90.349[1] mas/yr ; Dec.: −117.051[1] mas/yr
Parallax (π)	10.6862 ± 0.3860[1] mas
Distance	310 ± 10 ly ; (94 ± 3 pc)
Absolute magnitude (MV)	0.19[2]
Details
Radius	20[4] R☉
Luminosity	173.80[2] L☉
Surface gravity (log g)	1.86[5] cgs
Temperature	4,050[5] K
Metallicity [Fe/H]	−0.17[5] dex
Other designations
	3 PsA, CD−28°17178, FK5 1556, HD 201901, HIP 104750, HR 8110, SAO 190129[6]
Database references
SIMBAD	data

3 Piscis Austrini, also known as HD 201901, is a suspected astrometric binary[7] star system that, despite its Flamsteed designation, is actually located in the constellation Microscopium. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.41.[6] The system is moving closer to the Earth with a heliocentric radial velocity of −46 km/s.[2] It is following a highly elliptical orbit around the Galactic Center, moving between a pericenter of 2.6 kpc out to an apocenter of 7.6 kpc, with an orbital eccentricity of 0.49.[2]

The visible component is an evolved giant star with a stellar classification of K3 III.[3] The interferometry-measured angular diameter of the star, after correcting for limb darkening, is 2.03±0.04 mas,[8] which, at its estimated distance, equates to a physical radius of about 20 times the radius of the Sun.[4] It is radiating 174[2] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,050 K.[5]

References

Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
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.
Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 93.6\cdot 2.03)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 40.9\cdot R_{\bigodot }\end{aligned}}$
McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527
"HD 201901". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-11.
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.
Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.

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[GaiaDR2-1] Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.

[Anderson2012-2] 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.

[houk1979-3] Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.

[lang2006-4] Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1. The radius (R_*) is given by:
${\begin{aligned}2\cdot R_{*}&={\frac {(10^{-3}\cdot 93.6\cdot 2.03)\ {\text{AU}}}{0.0046491\ {\text{AU}}/R_{\bigodot }}}\\&\approx 40.9\cdot R_{\bigodot }\end{aligned}}$

[McWilliam1990-5] McWilliam, Andrew (December 1990), "High-resolution spectroscopic survey of 671 GK giants. I - Stellar atmosphere parameters and abundances", Astrophysical Journal Supplement Series, 74: 1075–1128, Bibcode:1990ApJS...74.1075M, doi:10.1086/191527

[SIMBAD-6] "HD 201901". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-04-11.

[Eggleton2008-7] 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.

[Richichi2005-8] Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431: 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.