Pi Piscis Austrini

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Pi Piscis Austrini
Diagram showing star positions and boundaries of the Piscis Austrinus constellation and its surroundings
Cercle rouge 100%.svg
Location of π Piscis Austrini (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Piscis Austrinus
Right ascension 23h 03m 29.81356s[1]
Declination −34° 44′ 57.8814″[1]
Apparent magnitude (V) 5.135[2]
Spectral type F1 V Fe-0.8[3]
U−B color index +0.00[4]
B−V color index +0.29[4]
Radial velocity (Rv) -6.00[2] km/s
Proper motion (μ) RA: 71.46[1] mas/yr
Dec.: 84.55[1] mas/yr
Parallax (π) 33.99 ± 0.73[1] mas
Distance 96 ± 2 ly
(29.4 ± 0.6 pc)
Absolute magnitude (MV) +2.78[3]
Primary π PsA A
Companion π PsA B
Period (P) 178.3177 days
Semi-major axis (a) 9.29 mas
Eccentricity (e) 0.5286
Inclination (i) 75.76°
Longitude of the node (Ω) 304.64°
Periastron epoch (T) 2435319.7305
Argument of periastron (ω)
Luminosity 6.42[3] L
Metallicity [Fe/H] +0.12[3] dex
Other designations
π PsA, CD−35° 15630, GC 32122, GJ 886.2, (Wo) 9807, HD 217792, HIP 113860, HR 8767, SAO 214275
Database references

Pi Piscis Austrini, Latinized from π Piscis Austrini, is spectroscopic binary in the constellation Piscis Austrinus, with a well-determined period of 178.3177 days and an apparent magnitude of +5.12.[6] It is approximately 93 light years from Earth.

The temperatures are 7400 Kelvin for Pi PsA A and 6900 for Pi PsA B, as well as their estimated brightness ratio, and get luminosities of 3.4 and 2.6 times that of the Sun.[6]

Pi Piscis Austrini is moving through the Galaxy at a speed of 16.3 km/s relative to the Sun. Its projected Galactic orbit carries it between 24,100 and 37,300 light years from the center of the Galaxy.[7]


  1. ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b "* pi. PsA". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 7 January 2017. 
  3. ^ a b c d Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971Freely accessible, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. 
  4. ^ a b "UBV Photometry of Some Southern Stars (Second List)". Monthly Notes of the Astron. Soc. Southern Africa. 32: 11. 1973. Bibcode:1973MNSSA..32...11C. 
  5. ^ ESA (1997). "The Hipparcos and Tycho Catalogues". VizieR On-line Data Catalog. Bibcode:1997yCat.1239....0E. 
  6. ^ a b PI PSA (Pi Piscis Austrini)
  7. ^ Pi Piscis Austrini (HIP 113860)