Psi1 Piscium

Psi1 Piscium (Psi1 Psc, ψ1 Piscium, ψ1 Psc) is binary star in constellation of Pisces. It is approximately 280 light years from Earth, based on its parallax.[1]

For other stars with this Bayer designation, see ψ Piscium.
Psi1 Piscium
Location of ψ1 Piscium (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Pisecs
ψ1 Psc A
Right ascension  01h 05m 40.95527s[1]
Declination +21° 28′ 23.4489″[1]
Apparent magnitude (V) 5.273[2]
ψ1 Psc B
Right ascension  01h 05m 41.71098s[1]
Declination +21° 27′ 55.5987″[1]
Apparent magnitude (V) 5.455[2]
Characteristics
ψ1 Psc A
Spectral type A1V + A4V[3]
U−B color index -0.12[4]
B−V color index -0.04[4]
ψ1 Psc B
Spectral type A0Vn[5]
U−B color index -0.17[4]
B−V color index -0.06[4]
Astrometry
ψ1 Psc A
Radial velocity (Rv)-3.90 ± 2.9[6] km/s
Proper motion (μ) RA: 44.49[1] mas/yr
Dec.: -14.82[1] mas/yr
Parallax (π)11.86 ± 0.68[1] mas
Distance280 ± 20 ly
(84 ± 5 pc)
ψ1 Psc B
Radial velocity (Rv)-7.20 ± 3.6[7] km/s
Proper motion (μ) RA: 52.88[1] mas/yr
Dec.: -11.88[1] mas/yr
Parallax (π)11.64 ± 0.68[1] mas
Distance280 ± 20 ly
(86 ± 5 pc)
Orbit[3]
Primaryψ1 Psc Aa
Companionψ1 Psc Ab
Period (P)14.44 ± 0.26 yr
Semi-major axis (a)114.3 ± 1.7″
Eccentricity (e)0.519 ± 0.027
Inclination (i)77.43 ± 0.81°
Longitude of the node (Ω)134.8 ± 1.2°
Periastron epoch (T)B 2007.512 ± 0.041
Argument of periastron (ω)
(secondary)		305.4 ± 2.3°
Other designations
ψ1 Psc, 74 Psc, ADS 899 AB, CCDM J01057+2128
ψ1 Psc A: BD+20° 156, HD 6456, HIP 5131, HR 310, SAO 74482
ψ1 Psc B: BD+20° 157, HD 6457, HIP 5132, HR 311, SAO 74483
Database references
SIMBADψ1 Psc A
ψ1 Psc B

The two components of Psi1 Piscium are both A-type main-sequence stars.[3][5] The primary has an apparent magnitude of 5.273, while the secondary is slightly dimmer, with an apparent magnitude of 5.455.[2] The primary itself is a close binary, with two A-type stars that orbit each other every 14.44 years.[3]

Psi1 Piscium is moving through the Galaxy at a speed of 22.5 km/s relative to the Sun. Its projected Galactic orbit carries it between 22,800 and 24,300 light years from the center of the Galaxy.[8]

Naming

In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of refers to an asterism consisting of ψ1 Piscium, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, τ Piscium, 91 Piscium, υ Piscium, φ Piscium and χ Piscium. Consequently, the Chinese name for ψ1 Piscium itself is 奎宿十六 (Kuí Sù shíliù, English: the Sixteenth Star of Legs.)[9]

References
  1. van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H.
  3. Horch, Elliott P.; Gomez, Shamilia C.; Sherry, William H.; Howell, Steve B.; Ciardi, David R.; Anderson, Lisa M.; Van Altena, William F. (2011). "Observations of Binary Stars with the Differential Speckle Survey Instrument. Ii.hipparcosstars Observed in 2010 January and June" (PDF). The Astronomical Journal. 141 (2): 45. Bibcode:2011AJ....141...45H. doi:10.1088/0004-6256/141/2/45.
  4. Tolbert, C. R. (1964). "A UBV Study of 94 Wide Visual Binaries". Astrophysical Journal. 139: 1105. Bibcode:1964ApJ...139.1105T. doi:10.1086/147852.
  5. "* 74 Psc B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2017.
  6. Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  7. Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
  8. Psi-1 Piscium A (HIP 5131)
  9. (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日


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