GU Piscium

GU Piscium is a star in the constellation Pisces.[5] An RS Canum Venaticorum variable, it ranges from magnitude 12.96 to 13.24 over 1.04 days.[6] It is 48 Parsecs (155 light-years) distant from Earth.[7] This star is also believed to be a member of the AB Doradus moving group with a membership probability of 96.9%.[8]

GU Piscium

A visual band light curve for GU Piscium, plotted from ASAS-SN data
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 01h 12m 35.0519s[1]
Declination 17° 03′ 55.5712″[1]
Apparent magnitude (V) 12.96 - 13.24
Characteristics
Spectral type M3[2]
Astrometry
Radial velocity (Rv)−1.5±0.5[3] km/s
Proper motion (μ) RA: 96.642±0.127[1] mas/yr
Dec.: −100.704±0.107[1] mas/yr
Parallax (π)21.0019 ± 0.0721 mas[1]
Distance155.3 ± 0.5 ly
(47.6 ± 0.2 pc)
Details
Radius0.54±0.04[4] R☉
Surface gravity (log g)4.75±0.07[4] cgs
Temperature3250±32[4] K
Metallicity−0.25±0.19[4]
Rotational velocity (v sin i)23.7±2.2[3] km/s
Other designations
1SWASP J011235.03+170355.7, 1RXS J011235.6+170401, GU Psc, 2MASS J01123504+1703557[5]
Database references
SIMBADdata

Planetary system

In 2014, it was found to have a gas giant planet—GU Piscium b—orbiting it.[7]

The GU Piscium planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b +9
−13 9–13 MJ[ MJ		 2000 163,000 — — —

References
  1. 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. Riaz, Basmah; Gizis, John E.; Harvin, James (2006). "Identification of New M Dwarfs in the Solar Neighborhood". The Astronomical Journal. 132 (2): 866–872. arXiv:astro-ph/0606617. Bibcode:2006AJ....132..866R. doi:10.1086/505632. S2CID 6282011.
  3. Malo, Lison; et al. (2014). "BANYAN. III. Radial Velocity, Rotation, and X-Ray Emission of Low-mass Star Candidates in Nearby Young Kinematic Groups". The Astrophysical Journal. 788 (1). 81. arXiv:1402.6053. Bibcode:2014ApJ...788...81M. doi:10.1088/0004-637X/788/1/81. S2CID 119276883.
  4. Malo, Lison; et al. (2014). "BANYAN. IV. Fundamental Parameters of Low-mass Star Candidates in Nearby Young Stellar Kinematic Groups—Isochronal Age Determination using Magnetic Evolutionary Models". The Astrophysical Journal. 792 (1). 37. arXiv:1406.6750. Bibcode:2014ApJ...792...37M. doi:10.1088/0004-637X/792/1/37. S2CID 96438831.
  5. "V* GU Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-06.
  6. BSJ (11 November 2011). "GU Piscium". AAVSO Website. American Association of Variable Star Observers. Retrieved 5 July 2014.
  7. Naud, Marie-Eve; et al. (2014). "Discovery of a Wide Planetary-Mass Companion to the Young M3 Star Gu Psc". The Astrophysical Journal. 787 (1). 5. arXiv:1405.2932. Bibcode:2014ApJ...787....5N. doi:10.1088/0004-637X/787/1/5. S2CID 35264096.
  8. Malo, Lison; et al. (2013). "Bayesian Analysis to Identify New Star Candidates in Nearby Young Stellar Kinematic Groups". The Astrophysical Journal. 762 (2). 88. arXiv:1209.2077. Bibcode:2013ApJ...762...88M. doi:10.1088/0004-637X/762/2/88. S2CID 118497872.
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