Mu Piscis Austrini

Mu Piscis Austrini
Location of μ Piscis Austrini (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Piscis Austrinus
Right ascension 22h 08m 23.014777s[1]
Declination −32° 59′ 18.3783″[1]
Apparent magnitude (V) +4.49[2]
Characteristics
Spectral type A1.5 IVn[3]
U−B color index +0.02[2]
B−V color index +0.08[2]
Astrometry
Radial velocity (Rv)+11.6±2.8[4] km/s
Proper motion (μ) RA: +71.315[1] mas/yr
Dec.: −33.001[1] mas/yr
Parallax (π)26.7542 ± 0.4513 mas[1]
Distance122 ± 2 ly
(37.4 ± 0.6 pc)
Absolute magnitude (MV)+1.41[4]
Details
Mass2.06[5] M☉
Luminosity24.5[4] L☉
Surface gravity (log g)4.00[5] cgs
Temperature9,034±307[5] K
Rotational velocity (v sin i)307.7±4.7[3] km/s
Age412[5] Myr
Other designations
μ PsA, 14 Piscis Austrini, HU PsA, CPD−33° 6221, FK5 832, HD 210049, HIP 109285, HR 8431, SAO 213576[6]
Database references
SIMBADdata

Mu Piscis Austrini, Latinized from μ Piscis Austrini, is a solitary,[7] white-hued star in the southern constellation of Piscis Austrinus. It is visible to the naked eye with an apparent visual magnitude of +4.49.[2] Based upon an annual parallax shift of 26.75 mas as seen from the Gaia space telescope, the star is located around 122±2 light years from the Sun.

This star has the spectrum of an A-type subgiant with a stellar classification of A1.5 IVn. It is spinning rapidly with a projected rotational velocity of 308 km/s.[3] This is giving the star an oblate shape with an equatorial bulge that is an estimated 23% larger than the polar radius.[8] An X-ray emission has been detected from this star with a luminosity of 89.6×1027 erg s−1. This may be coming from an undiscovered companion, since A-type stars are not expected to be a significant source of X-rays.[9]

Mu Piscis Austrini is moving through the Galaxy at a speed of 20 km/s relative to the Sun. Its projected Galactic orbit carries it between 23,800 and 28,500 light years from the center of the Galaxy. Mu Piscis Austrini came closest to the Sun 1.2 million years ago at a distance of 111 light years.[4]

  1. ^ a b c d e 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.
  2. ^ a b c d Cite error: The named reference Drilling1971 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Diaz2011 was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Schroeder2007 was invoked but never defined (see the help page).