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Star in the constellation Microscopium From Wikipedia, the free encyclopedia
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]
 | |
| 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] |
| Distance | 354 ± 4 ly (109 ± 1 pc) |
| Absolute magnitude (MV) | +0.19[8] |
| Details | |
| Mass | 2.36[9] M☉ |
| Radius | 16.4[10] R☉ |
| Luminosity | 122±2[11] L☉ |
| Surface gravity (log g) | 2.88±0.15[12] cgs |
| Temperature | 4,632±24[13] K |
| Metallicity [Fe/H] | −0.01[14] dex |
| Rotational velocity (v sin i) | <1.2[15] km/s |
| Age | 930[9] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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]
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