3 Piscis Austrini

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3 Piscis Austrini
Microscopium constellation map.svg
Red circle.svg
Location of 3 PsA (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 13m 17.32730s [1]
Declination −27° 37′ 09.7106″ [1]
Apparent magnitude  (V)5.39±0.01 [2]
Characteristics
Spectral type K3 III [3]
B−V color index +1.42 [4]
Astrometry
Radial velocity (Rv)−46.2±2.4 [5]  km/s
Proper motion (μ)RA: +98.513  mas/yr [1]
Dec.: −110.906  mas/yr [1]
Parallax (π)8.0734 ± 0.1733  mas [1]
Distance 404 ± 9  ly
(124 ± 3  pc)
Absolute magnitude  (MV)+0.19 [6]
Details
Mass 1.58 [7]   M☉
Radius 31.3±1.6 [8]   R☉
Luminosity 184+9
−8 [1]   L☉
Surface gravity (log g)1.86 [9]   cgs
Temperature 4,225±123 [10]   K
Metallicity [Fe/H]−0.17 [9]   dex
Rotational velocity (v sin i)<1 [11]  km/s
Age 2.59+0.83
−1.90 [1]   Gyr
Other designations
3 PsA, 58 G. Microscopii [12] , CD−28°17178, CPD−28°7411, FK5  1556, GC  29652, HD  201901, HIP  104750, HR  8110, SAO  190129 [13]
Database references
SIMBAD data

3 Piscis Austrini, also known as HD 201901 or simply 3 PsA, is an astrometric binary [14] (100% chance [15] ) located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The system has a combined apparent magnitude of 5.39, [2] making it faintly visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 404 light years [1] and it is currently approaching the Solar System with a heliocentric radial velocity of −46.2  km/s . [5] At its current distance, 3 PsA's brightness is diminished by 0.12 magnitudes due to extinction from interstellar dust [16] and it has an absolute magnitude of +0.19. [6]

The visible component is an evolved red giant 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 , [17] which, at its estimated distance, equates to a physical radius of about 20 times the radius of the Sun. [18] However, its actual empirical radius is 31.3  R☉. [8] It has 1.58 times the mass of the Sun [7] and is radiating 184 times the luminosity of the Sun [1] from its enlarged photosphere at an effective temperature of 4,225  K . [10] 3 PsA is metal deficient with an iron abundance 68% that of the Sun ([Fe/H] = −0.17) [9] and it spins too slowly for its projected rotational velocity to be measured accurately. [11] It is estimated to be 2.59 billion years old based on Gaia DR3 models. [1]

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References

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