Theta Piscium

Infotaula objecte astronòmicTheta Piscium
Tipusestrella amb alt moviment propi, font propera a infrarrojos i font d'emissió de raigs UV Modifica el valor a Wikidata
Tipus espectral (estel)K0.5III[1] Modifica el valor a Wikidata
Constel·lacióPeixos Modifica el valor a Wikidata
ÈpocaJ2000.0 Modifica el valor a Wikidata
Característiques físiques i astromètriques
Distància de la Terra51,9659 pc [2] Modifica el valor a Wikidata
Radi9,46 R☉ Modifica el valor a Wikidata
Diàmetre13.400.000 km[3] Modifica el valor a Wikidata
Magnitud absoluta0,844[4] Modifica el valor a Wikidata
Magnitud aparent (V)4,3 (banda V)[5] Modifica el valor a Wikidata
Massa1,54 M☉ Modifica el valor a Wikidata
Temperatura efectiva4.704 K[6] Modifica el valor a Wikidata
Paral·laxi19,2434 mas[2] Modifica el valor a Wikidata
Moviment propi (declinació)−43,229 mas/a [2] Modifica el valor a Wikidata
Moviment propi (ascensió recta)−125,581 mas/a [2] Modifica el valor a Wikidata
Velocitat de rotació estel·lar3,1 km/s[7] Modifica el valor a Wikidata
Velocitat radial6,49 km/s[8] Modifica el valor a Wikidata
Gravetat superficial equatorial520 cm/s²[6] Modifica el valor a Wikidata
Ascensió recta (α)23h 27m 58.0947s[2] Modifica el valor a Wikidata
Declinació (δ)6° 22' 44.3723''[2] Modifica el valor a Wikidata
Metal·licitat0,08[3] Modifica el valor a Wikidata
Lluminositat82 lluminositats solars Modifica el valor a Wikidata
Edat estimada2,45 milions d'anys Modifica el valor a Wikidata
Catàlegs astronòmics
SAO 128196 (Catàleg SAO)
GSC 00584-01515 (GSC)
2MASS J23275810+0622442 (2MASS)
HD 220954 (Henry Draper Catalogue)
HIP 115830 (Catàleg Hipparcos)
HR 8916 (Catàleg d'Estrelles Brillants)
IRAS 23254+0606 (IRAS)
θ Psc (nomenclatura de Bayer)
PLX 5682 (Catàleg General de Paral·laxis Estel·lars Trigonomètriques)
BD+05 5173 (Bonner Durchmusterung)
FK5 1614 (FK5)
GC 32647 (Catàleg General de Boss)
GCRV 14720 (General Catalogue of Stellar Radial Velocities)
HIC 115830 (Hipparcos Input Catalogue)
IRC +10535 (Two-Micron Sky Survey)
JP11 3630 (JP11)
N30 5152 (Catalog of 5,268 Standard Stars Based on the Normal System N30)
PMC 90-93 1150 (Tokyo Photoelectric Meridian Circle Catalog)
PPM 174110 (Catàleg d'estrelles PPM)
ROT 3410 (Catàleg de velocitats rotacionals dels estels)
TD1 29864 (Catàleg de Fluxes Estel·lars Ultraviolats TD1)
TYC 584-1515-1 (Catàleg Tycho)
UBV 20145 (UBV)
YZ 6 11651 (YZ)
PLX 5682.00 (Catàleg General de Paral·laxis Estel·lars Trigonomètriques)
WEB 20494 (Vitesses radiales. Catalogue WEB: Wilson Evans Batten. Radial velocities: The Wilson-Evans-Batten catalogue)
Gaia DR2 2661524098698265984 (Gaia Data Release 2)
10 Psc (Nomenclatura de Flamsteed)
Gaia DR3 2661524098698483456 (Gaia DR3)
TIC 354356126 (TESS Input Catalog)
AG+06 3192 (AGK3U)
UBV M 27041 (UBV) Modifica el valor a Wikidata

Theta Piscium (θ Psc / 10 Piscium) és un estel a la constel·lació dels Peixos de magnitud aparent +4,28.[9] No té nom propi habitual, però en l'astronomia xinesa, al costat de Fum al Samakah (β Piscium), γ Piscium, ι Piscium i ω Piscium, formava Peih Leih, «el llampec».[10] S'hi troba a 159 anys llum del sistema solar.

Theta Piscium és una gegant taronja de tipus espectral K1III.[9] Té una temperatura efectiva de 4.699 K i és 51 vegades més lluminosa que el Sol.[11] El seu diàmetre angular, una vegada considerat l'enfosquiment de limbe, és de 2,00 ± 0,02 mil·lisegons d'arc; això permet avaluar el seu diàmetre real, resultant ser aquest 10,5 vegades més gran que el diàmetre solar.[12] Gira sobre si mateixa amb una velocitat de rotació projectada de 1,9 km/s.[13] Té una edat estimada de 4.330 milions d'anys i, com la major part dels estels del nostre entorn, és un estel del disc fi.[14]

Theta Piscium presenta una metal·licitat —abundància relativa d'elements més pesats que l'heli— un poc menor que la solar ([Fe/H] = -0,10).[14] Altres elements com a sodi, alumini i silici presenten uns nivells comparativament iguals als de ferro, si bé Theta Piscium sembla ser un poc deficitària en bari ([Ba/Fe] = -0,14).[15]

Referències

  1. ↑ «The Perkins catalog of revised MK types for the cooler stars» (en anglès). The Astrophysical Journal Supplement Series, 10-1989, pàg. 245–266. DOI: 10.1086/191373.
  2. ↑ 2,0 2,1 2,2 2,3 2,4 2,5 Afirmat a: Gaia Early Data Release 3. Indicat a la font segons: SIMBAD. Llengua del terme, de l'obra o del nom: anglès. Data de publicació: 3 desembre 2020.
  3. ↑ 3,0 3,1 Jesus Maldonado «The metallicity signature of evolved stars with planets» (en anglès). Astronomy and Astrophysics, 6-2013, pàg. 84–84. DOI: 10.1051/0004-6361/201321082.
  4. ↑ Caroline Soubiran «Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants» (en anglès). Astronomy and Astrophysics, 1, 3-2008, pàg. 91–101. DOI: 10.1051/0004-6361:20078788.
  5. ↑ Afirmat a: Catalogue of Stellar Photometry in Johnson's 11-color system. Indicat a la font segons: SIMBAD. Llengua del terme, de l'obra o del nom: anglès. Data de publicació: 2002.
  6. ↑ 6,0 6,1 Henrik Jönsson «Abundances of disk and bulge giants from high-resolution optical spectra. I. O, Mg, Ca, and Ti in the solar neighborhood and Kepler field samples» (en anglès). Astronomy and Astrophysics, 08-02-2017. DOI: 10.1051/0004-6361/201629128.
  7. ↑ David W. Latham «Rotational and radial velocities for a sample of 761 Hipparcos giants and the role of binarity» (en anglès). Astronomical Journal, 1, 07-12-2007, pàg. 209–231. DOI: 10.1088/0004-6256/135/1/209.
  8. ↑ Henrik Jönsson «Abundances of disk and bulge giants from high-resolution optical spectra. I. O, Mg, Ca, and Ti in the solar neighborhood and Kepler field samples» (en anglès). Astronomy and Astrophysics, 08-02-2017. DOI: 10.1051/0004-6361/201629128.
  9. ↑ 9,0 9,1 «* tet Psc -- High proper-motion Star» (en anglès). SIMBAD (Centre de Dades astronòmiques d'Estrasburg). [Consulta: 10 desembre 2020].
  10. ↑ Allen, Richard Hinckley. «Pisces». A: Courier Dover Publications. Star Names — Their Lore and Meaning (en anglès), 1889, p. 563. ISBN 0-486-21079-0. 
  11. ↑ Massarotti, Alessandro; Latham, David W.; Stefanik, Robert P.; Fogel, Jeffrey «Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity». The Astronomical Journal, 135, 1, 2008. pp. 209-231.
  12. ↑ Richichi, A.; Percheron, I.; Khristoforova, M. «CHARM2: An updated Catalog of High Angular Resolution Measurements». Astronomy and Astrophysics, 431, 4, 2005. pp. 773-777 (Tabla consultada en CDS).
  13. ↑ Hekker, S.; Meléndez, J. «Precise radial velocities of giant stars. III. Spectroscopic stellar parameters». Astronomy and Astrophysics, 475, 3, 2007. pp. 1003-1009.
  14. ↑ 14,0 14,1 Soubiran, C.; Bienaymé, O.; Mishenina, T. V.; Kovtyukh, V. V. «Vertical distribution of Galactic disk stars. IV. AMR and AVR from clump giants». Astronomy and Astrophysics, 480, 1, 2008. pp. 91-101.
  15. ↑ Liu, Y. J.; Zhao, G.; Shi, J. R.; Pietrzyński, G.; Gieren, W. «The abundances of nearby red clump giants». Monthly Notices of the Royal Astronomical Society, 382, 2, 2007. pp. 553-566.

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