Psi1 Piscium

Psi1 Piscium
Diagram showing star positions and boundaries of the Pisces constellation and its surroundings
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

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]

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, ψ1 Piscium itself is known as 奎宿十六 (Kuí Sù shíliù, English: the Sixteenth Star of Legs.)[9]

References

  1. 1 2 3 4 5 6 7 8 9 10 11 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. 1 2 3 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. 1 2 3 4 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". The Astronomical Journal. 141 (2): 45. Bibcode:2011AJ....141...45H. doi:10.1088/0004-6256/141/2/45.
  4. 1 2 3 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. 1 2 "* 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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