Location of ψ Piscium (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Pisecs |
| ψ Psc A | |
| Right ascension | 01 05 40.95527 |
| Declination | +21° 28′ 23.4489″ |
| Apparent magnitude (V) | 5.273 |
| ψ Psc B | |
| Right ascension | 01 05 41.71111 |
| Declination | +21° 27′ 55.6120″ |
| Apparent magnitude (V) | 5.455 |
| Characteristics | |
| ψ Psc A | |
| Spectral type | A1V + A4V |
| U−B color index | −0.12 |
| B−V color index | −0.04 |
| ψ Psc B | |
| Spectral type | A0Vn |
| U−B color index | −0.17 |
| B−V color index | −0.06 |
| Astrometry | |
| ψ Psc A | |
| Radial velocity (Rv) | −3.90±2.9 km/s |
| Proper motion (μ) | RA: 44.49 mas/yr Dec.: −14.82 mas/yr |
| Parallax (π) | 11.86 ± 0.68 mas |
| Distance | 280 ± 20 ly (84 ± 5 pc) |
| Absolute magnitude (MV) | +0.71 |
| ψ Psc B | |
| Radial velocity (Rv) | −7.20±3.6 km/s |
| Proper motion (μ) | RA: 54.952 mas/yr Dec.: −15.938 mas/yr |
| Parallax (π) | 11.3778 ± 0.0506 mas |
| Distance | 287 ± 1 ly (87.9 ± 0.4 pc) |
| Absolute magnitude (MV) | +0.89 |
| Orbit | |
| Primary | ψ Psc Aa |
| Companion | ψ 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° |
| Details | |
| ψ Psc Aa | |
| Mass | 2.2 M☉ |
| ψ Psc Ab | |
| Mass | 1.7 M☉ |
| Details | |
| ψ Psc B | |
| Mass | 2.6 M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 57 L☉ |
| Surface gravity (log g) | 4.04 cgs |
| Temperature | 10,694 K |
| Rotational velocity (v sin i) | 250 km/s |
| Age | 210 Myr |
| Other designations | |
| ψ Psc, 74 Psc, ADS 899 AB, CCDM J01057+2128 | |
| ψ Psc A: BD+20°156, HD 6456, HIP 5131, HR 310, SAO 74482 | |
| ψ Psc B: BD+20°157, HD 6457, HIP 5132, HR 311, SAO 74483 | |
| Database references | |
| SIMBAD | ψ Psc A |
| ψ Psc B | |
Psi Piscium (Psi Psc, ψ Piscium, ψ Psc) is a binary star in the constellation Pisces. It is approximately 280 light years from Earth, based on its parallax.
The two components of Psi Piscium are both A-type main-sequence stars. The primary has an apparent magnitude of 5.273, while the secondary is slightly dimmer, with an apparent magnitude of 5.455. The primary itself is a close binary, with two A-type stars that orbit each other every 14.44 years.
Psi 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.
Naming
In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of refers to an asterism consisting of ψ 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 ψ Piscium itself is 奎宿十六 (Kuí Sù shíliù, English: the Sixteenth Star of Legs.)
References
- ^ 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.
- ^ 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.
- ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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. S2CID 27904496. Archived from the original on 2021-01-25. Retrieved 2023-01-24.
- ^ Tolbert, C. R. (1964). "A UBV Study of 94 Wide Visual Binaries". Astrophysical Journal. 139: 1105. Bibcode:1964ApJ...139.1105T. doi:10.1086/147852.
- ^ "* 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.
- ^ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
- 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.
- ^ Tokovinin, Andrei (23 February 2018). "The Updated Multiple Star Catalog". The Astrophysical Journal Supplement Series. 235 (1): 6. arXiv:1712.04750. Bibcode:2018ApJS..235....6T. doi:10.3847/1538-4365/aaa1a5. eISSN 1538-4365.
- Howe, K. S.; Clarke, C. J. (January 2009). "An analysis of v sin (i) correlations in early-type binaries". Monthly Notices of the Royal Astronomical Society. 392 (1): 448–454. Bibcode:2009MNRAS.392..448H. doi:10.1111/j.1365-2966.2008.14073.x. ISSN 0035-8711. S2CID 120183969.
- 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 Archived 2016-03-03 at the Wayback Machine
