Psi2 Piscium

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Psi2 Piscium

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Psi² Piscium
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Location of ψ² Piscium (circled)
Constellation	Pisces
Right ascension	01^h 07^m 57.16387^s^[1]
Declination	+20° 44′ 20.8310″^[1]
Apparent magnitude (V)	+5.56^[2]
Characteristics
Spectral type	A3 V^[3]
B−V color index	+0.12^[2]
Astrometry

Radial velocity (R_v)	−15.2±0.9^[4] km/s
Proper motion (μ)	RA: +86.72^[1] mas/yr Dec.: −82.75^[1] mas/yr
Parallax (π)	21.14 ± 0.77 mas^[1]
Distance	154 ± 6 ly (47 ± 2 pc)
Absolute magnitude (M_V)	+2.19^[5]

Details

Mass	1.82^[6] `M`_☉
Radius	2.0^[7] `R`_☉
Luminosity	13^[3] `L`_☉
Surface gravity (log g)	4.36±0.14^[6] cgs
Temperature	8,611±293^[6] K
Rotational velocity (v sin i)	149^[3] km/s
Age	250^[6] Myr

Other designations
ψ² Psc, 79 Piscium, BD+19° 185, HD 6695, HIP 5310, HR 328, SAO 74506^[8]
Database references
SIMBAD	data

Psi² Piscium (ψ² Piscium) is a white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.56.^[2] Based upon an annual parallax shift of 8.66 mas as seen from Earth,^[1] it is located about 380 light years from the Sun. It has a peculiar velocity of 14.6±2.9 km/s, indicating it is a runaway star.^[9]

This is a suspected binary star system,^[10] with a companion star at an angular separation of 0.357±0.002 arc seconds along a position angle of 174.99°±0.30° from the primary, as of 2008. This corresponds to a projected separation of 16.88±0.62 AU.^[11] The brighter component is an A-type main sequence star with a stellar classification of A3 V.^[3] The system is a source of X-ray emission with a luminosity of 143.9×10²⁰ W, which is most likely originating from the cooler companion since A-type main sequence stars are not expected to be magnetically active.^[12]

References

[edit]

^ ^a ^b ^c ^d ^e ^f van Leeuwen, F. (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. (March 2000), "The Tycho-2 catalogue of the 2.5 million brightest stars", Astronomy and Astrophysics, 355: L27–L30, Bibcode:2000A&A...355L..27H, doi:10.1888/0333750888/2862.
^ ^a ^b ^c ^d Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
^ 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.
^ ^a ^b ^c ^d David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
^ "psi02 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-07-23.{{cite web}}: CS1 maint: postscript (link)
^ Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
^ De Rosa, R. J.; et al. (2012), "The Volume-limited A-Star (VAST) survey - II. Orbital motion monitoring of A-type star multiples", Monthly Notices of the Royal Astronomical Society, 422 (4): 2765, arXiv:1112.3666, Bibcode:2012MNRAS.422.2765D, doi:10.1111/j.1365-2966.2011.20397.x, S2CID 102487103.
^ Schröder, C.; Schmitt, J. H. M. M. (November 2007), "X-ray emission from A-type stars", Astronomy and Astrophysics, 475 (2): 677–684, Bibcode:2007A&A...475..677S, doi:10.1051/0004-6361:20077429.

Constellation of Pisces

Stars

Bayer	α (Alrescha) β (Fumalsamakah) γ δ ε ζ (Revati) η (Alpherg) θ ι κ λ μ ν ξ ο (Torcular) π ρ σ τ υ φ χ ψ¹ ψ² ψ³ ω
Flamsteed	1 2 3 5 (A) 7 (b) 9 11 12 13 14 15 16 20 21 22 24 25 26 27 29 30 31 32 (c) 33 34 35 36 37 38 39 40 41 (d) 42 43 44 45 46 47 48 49 51 52 53 54 55 57 58 59 60 61 62 64 65 (i) 66 67 (k) 68 (h) 70 72 73 75 76 77 78 80 (e) 82 (g) 87 88 89 (f) 91 (l) 92 94 95 96 97 100 101 103 104 105 107 109 112 4 Cet 5 Cet
Variable	RZ SZ TX (19) UV VY (3 Ari) VZ ZZ AR BR DV GU
HR	2 107 222 8734
HD	1502 (Citadelle) 3167 4203 4313 8574 (Bélénos) 9986 217107 217786 218566 (Ebla)
Other	Gliese 12 Gliese 900 GJ 9827 2MASS 0036+1821 NGC 33 NGC 46 NGC 316 NGC 400 NGC 401 NGC 402 NGC 408 NGC 552 NGC 730 SIMP J013656.5+093347 van Maanen 2 WASP-32 (Parumleo) WASP-76

Exoplanets	HD 1502 b (Indépendance) HD 3167 b HD 4203 b c HD 4313 b HD 8574 b (Bélisama) HD 217107 b c HD 217786 b c HD 218566 b (Ugarit) γ Piscium b GU Piscium b 54 Piscium b WASP-76b

Galaxies

Messier	74
NGC	3 12 36 38 57 60 63 75 78 95 99 100 105 106 125 126 127 128 130 137 138 139 141 164 180 182 186 190 193 194 198 199 200 202 203 204 208 213 234 236 240 250 251 257 266 282 287 296 311 313 315 316 318 326 332 338 354 370 372 373 374 375 379 380 382 383 384 385 386 387 388 390 392 394 396 397 398 399 400 401 403 407 410 414 420 437 443 444 446 447 449 452 455 459 462 463 467 468 469 470 471 472 473 474 475 476 479 483 485 486 488 489 490 492 493 494 495 496 498 499 500 501 502 503 504 505 506 507 508 509 511 514 515 516 517 518 520 522 524 525 532 553 575 606 645 656 660 664 665 676 706 741 766 7459 7499 7501 7503 7537 7541 7544 7583 7603 7679 7682 7714 7716 7816 7835 7837 7838 7840
Other	3C 459 Andromeda II Andromeda XXII IC 64 IC 1481 I Zwicky 1 KIDS J232940-34092 Pisces A Pisces B Pisces Dwarf UGC 224 UGC 477 UGC 717 UGC 934