Psi1 Piscium
 | |
| 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 mas[1] |
| Distance | 280 ± 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 mas[1] |
| Distance | 280 ± 20 ly (86 ± 5 pc) |
| Orbit[3] | |
| Primary | ψ1 Psc Aa |
| Companion | ψ1 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 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 | |
| SIMBAD | ψ1 Psc A |
| ψ1 Psc B | |
Psi1 Piscium (Psi1 Psc, ψ1 Piscium, ψ1 Psc) is a binary star in the constellation 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, the Chinese name for ψ1 Piscium itself is 奎宿十六 (Kuí Sù shíliù, Template:Lang-en.)[9]
References
- ^ a b c d e f g h i j k 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. S2CID 18759600.
- ^ a b c 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.
- ^ a b c d 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.
- ^ a b c d Tolbert, C. R. (1964). "A UBV Study of 94 Wide Visual Binaries". Astrophysical Journal. 139: 1105. Bibcode:1964ApJ...139.1105T. doi:10.1086/147852.
- ^ a b "* 74 Psc B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2017.
- ^ 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. S2CID 119231169.
- ^ 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. S2CID 119323941.
- ^ Psi-1 Piscium A (HIP 5131)
- ^ (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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