Psi1 Piscium

For other stars with this Bayer designation, see ψ Piscium (disambiguation).

ψ^1 Piscium

Location of ψ^1 Piscium (circled)
Observation data Epoch J2000      Equinox J2000
Constellation	Pisecs
ψ^1 Psc A
Right ascension	01^h 05^m 40.95527^s[1]
Declination	+21° 28′ 23.4489″[1]
Apparent magnitude (V)	5.273[2]
ψ^1 Psc B
Right ascension	01^h 05^m 41.71111^s[3]
Declination	+21° 27′ 55.6120″[3]
Apparent magnitude (V)	5.455[2]
Characteristics
ψ^1 Psc A
Spectral type	A1V + A4V[4]
U−B color index	−0.12[5]
B−V color index	−0.04[5]
ψ^1 Psc B
Spectral type	A0Vn[6]
U−B color index	−0.17[5]
B−V color index	−0.06[5]
Astrometry
ψ^1 Psc A
Radial velocity (Rv)	−3.90±2.9[7] 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)
Absolute magnitude (MV)	+0.71[8]
ψ^1 Psc B
Radial velocity (Rv)	−7.20±3.6[9] km/s
Proper motion (μ)	RA: 54.952[3] mas/yr Dec.: −15.938[3] mas/yr
Parallax (π)	11.3778 ± 0.0506 mas[3]
Distance	287 ± 1 ly (87.9 ± 0.4 pc)
Absolute magnitude (MV)	+0.89[8]
Orbit[4]
Primary	ψ^1 Psc Aa
Companion	ψ^1 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^1 Psc Aa
Mass	2.2[10] M☉
ψ^1 Psc Ab
Mass	1.7[10] M☉
Details
ψ^1 Psc B
Mass	2.6[3] M☉
Radius	2.2[3] R☉
Luminosity	57[3] L☉
Surface gravity (log g)	4.04[3] cgs
Temperature	10,694[3] K
Rotational velocity (v sin i)	250[11] km/s
Age	210[3] Myr
Other designations
ψ^1 Psc, 74 Psc, ADS 899 AB, CCDM J01057+2128
ψ^1 Psc A: BD+20°156, HD 6456, HIP 5131, HR 310, SAO 74482
ψ^1 Psc B: BD+20°157, HD 6457, HIP 5132, HR 311, SAO 74483
Database references
SIMBAD	ψ^1 Psc A
	ψ^1 Psc B

Psi^1 Piscium (Psi^1 Psc, ψ^1 Piscium, ψ^1 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 Psi^1 Piscium are both A-type main-sequence stars.[4][6] 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.[4]

Psi^1 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.[12]

Naming

In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism consisting of refers to an asterism consisting of ψ^1 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^1 Piscium itself is 奎宿十六 (Kuí Sù shíliù, English: the Sixteenth Star of Legs.)[13]

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. S2CID 18759600.
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. 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.
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. S2CID 27904496.
5. Tolbert, C. R. (1964). "A UBV Study of 94 Wide Visual Binaries". Astrophysical Journal. 139: 1105. Bibcode:1964ApJ...139.1105T. doi:10.1086/147852.
6. "* 74 Psc B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 24 May 2017.
7. 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.
8. 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.
9. 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.
10. 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.
11. 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.
12. Psi-1 Piscium A (HIP 5131)
13. (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