2 Piscis Austrini

2 Piscis Austrini
Location of 2 PsA (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 21h 06m 24.67730s[1]
Declination −32° 20′ 29.8282″[1]
Apparent magnitude (V) 5.20±0.01[2]
Characteristics
Evolutionary stage horizontal branch[3]
Spectral type K2 III[4] or K3 III[5]
B−V color index +1.10[6]
Astrometry
Radial velocity (Rv)3.1±2.8[7] km/s
Proper motion (μ) RA: −5.949 mas/yr[1]
Dec.: +7.786 mas/yr[1]
Parallax (π)9.2085 ± 0.0973 mas[1]
Distance354 ± 4 ly
(109 ± 1 pc)
Absolute magnitude (MV)+0.19[8]
Details
Mass2.36[9] M☉
Radius16.4[10] R☉
Luminosity122±2[11] L☉
Surface gravity (log g)2.88±0.15[12] cgs
Temperature4,632±24[13] K
Metallicity [Fe/H]−0.01[14] dex
Rotational velocity (v sin i)<1.2[15] km/s
Age930[9] Myr
Other designations
2 PsA, 49 G. Microscopii[16], CD−32°16398, CPD−32°6288, GC 29465, HD 200763, HIP 104174, HR 8076, SAO 212716[17]
Database references
SIMBADdata

2 Piscis Austrini, also known as HD 200763 or simply 2 PsA, is a solitary orange hued star[18] located in the southern constellation Microscopium. It was once part of Piscis Austrinus, the southern fish. The object has an apparent magnitude of 5.2,[2] making it faintly visible to the naked eye under ideal conditions. Based on parallax measurements from the Gaia satellite, it is estimated to be 354 light years away from the Solar System.[1] However, it is receding with a poorly constrained heliocentric radial velocity of 3.1 km/s.[7] At its current distance, 2 PsA's brightness is diminished by 0.11 magnitudes due to interstellar dust.[19] It has an absolute magnitude of 0.19.[8]

This is an evolved star with a stellar classification of either K2 III or K3 III.[4][5] Nevertheless, both indicate that the object is a red giant. 2 PsA is estimated to be 930 million years old,[9] enough time for it to cool and expand to 16.4 times the Sun's radius.[10] It is currently on the horizontal branch (HB), generating energy through helium fusion at its core.[3] The star is located in a metal rich region of the HB called the red clump. At present 2 PsA has 2.36 times the mass of the Sun and is radiating 122 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,632 K.[13] 2 PsA has a solar metallicity and spins slowly with a projected rotational velocity lower than 1.2 km/s.[15]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Houk1982 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Hofliet1943 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Lake1965 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference Demarque2004 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Gomes da Silva2021 was invoked but never defined (see the help page).
  13. ^ a b Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference McWilliam1990 was invoked but never defined (see the help page).
  15. ^ a b Cite error: The named reference DeMed2014 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  19. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).