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Theta Piscium

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Theta Piscium
Location of θしーた Piscium (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pisces
Right ascension 23h 27m 58.09529s[1]
Declination +6° 22′ 44.3720″[1]
Apparent magnitude (V) 4.27[2]
Characteristics
Spectral type K1 III[2]
U−B color index +1.00
B−V color index +1.062[2]
Astrometry
Radial velocity (Rv)+6.05±0.19[2] km/s
Proper motion (μみゅー) RA: −123.83[1] mas/yr
Dec.: −43.26[1] mas/yr
Parallax (πぱい)21.96 ± 0.25 mas[1]
Distance149 ± 2 ly
(45.5 ± 0.5 pc)
Absolute magnitude (MV)+0.83[2]
Details
Mass1.58[3] M☉
Radius11[4] R☉
Luminosity51.3[4] L☉
Surface gravity (log g)2.70[5] cgs
Temperature4,684±23[3] K
Metallicity [Fe/H]0.06[5] dex
Rotational velocity (v sin i)3.1[4] km/s
Age2.45[3] Myr
Other designations
θしーた Psc, 10 Piscium, BD+05° 5173, FK5 1614, GC 32647, HD 220954, HIP 115830, HR 8916, SAO 128196, PPM 174110[6]
Database references
SIMBADdata

Theta Piscium, Latinized from θしーた Piscium, is a single,[7] orange-hued star in the zodiac constellation of Pisces, the fish. The annual parallax shift of this star was measured during the Hipparcos mission as 21.96 mas,[1] which yields a distance estimate of about 149 light years. It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.27.[2] The star is moving away from the Sun with a radial velocity of +6 km/s.[2]

At the estimated age of 2.5 billion years,[3] this is an aging giant star with a stellar classification of K1 III,[2] which means it has exhausted the supply of hydrogen at its core. It is a red clump star, indicating it is on the horizontal branch of its evolution and is generating energy through helium fusion at its core.[5] Theta Piscium has 158%[3] of the Sun's mass and its outer atmosphere has swollen to about 11[4] times the girth of the Sun. It is brighter yet cooler than the Sun, radiating 51.3[4] times the Sun's luminosity from its enlarged photosphere at an effective temperature of about 4,684 K.[3]

Naming

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In Chinese, 霹靂へきれき (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of refers to an asterism consisting of θしーた Piscium, βべーた Piscium, γがんま Piscium, ιいおた Piscium and ωおめが Piscium. Consequently, the Chinese name for θしーた Piscium itself is 霹靂へきれき三さん (Pī Lì sān, English: the Third Star of Thunderbolt.)[8]

References

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  1. ^ 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.
  2. ^ a b c d e f g h Hekker, S.; et al. (August 2006), "Precise radial velocities of giant stars. I. Stable stars", Astronomy and Astrophysics, 454 (3): 943–949, arXiv:astro-ph/0604502, Bibcode:2006A&A...454..943H, doi:10.1051/0004-6361:20064946, S2CID 119529768.
  3. ^ a b c d e f Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114.
  4. ^ a b c d e Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 Hipparcos Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. ^ a b c Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  6. ^ "tet Lib". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-12-17.
  7. ^ 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.
  8. ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文てんもん教育きょういく資し訊網 2006 年ねん 7 月がつ 8 日にち
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