Gamma Piscium

γがんま Piscium
	Location of γがんま Piscium (circled)
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Pisces
Right ascension	23h 17m 09.937s
Declination	+03° 16′ 56.25″
Apparent magnitude (V)	3.699
Characteristics
Evolutionary stage	Horizontal branch
Spectral type	G8 III
U−B color index	+0.572
B−V color index	+0.924
Astrometry
Radial velocity (Rv)	−13.6 km/s
Proper motion (μみゅー)	RA: 759.268 mas/yr ; Dec.: 17.568 mas/yr
Parallax (πぱい)	24.1958 ± 0.2967 mas
Distance	135 ± 2 ly ; (41.3 ± 0.5 pc)
Absolute magnitude (MV)	0.68±0.08
Details
Mass	0.97±0.12 M☉
Radius	11.28±0.10 R☉
Luminosity	62.7±3.3 L☉
Surface gravity (log g)	2.43 ± 0.06 cgs
Temperature	4833±62 K
Metallicity [Fe/H]	−0.51 dex
Age	4.58±3.10 Gyr
Other designations
	Gamma Psc, γがんま Piscium, γがんま Psc, 6 Piscium, BD+02°4648, FK5 878, GC 32415, HD 219615, HIP 114971, HR 8852, SAO 128085, PPM 173938, 2MASS J23170996+0316563
Database references
SIMBAD	data

Gamma Piscium (γがんま Piscium) is a star approximately 135 light years away from Earth in the zodiac constellation of Pisces. It is a yellow star with a spectral type of G8 III, meaning it has a surface temperature of 4,833 K and is a giant star. It is slightly cooler than the Sun, yet it is 11^[4] solar radii in size and shines with the light of 63 Suns.^[4] The star is a member of the red clump, which means it is undergoing core helium fusion.^[9] At an apparent magnitude of 3.7,^[2] it is the second brightest star in the constellation Pisces, between Eta and Alpha.

Gamma Piscium moves across the sky at three-quarters of an arcsecond per year, which at 135 light years corresponds to 153 kilometers per second.^{[citation needed]} This suggests it is a visitor from another part of the Milky Way Galaxy; in astronomical terms, it will quickly leave the vicinity of the Sun. Its metallicity is only one-fourth that of the Sun, and visitors from outside the thin disk that composes the Milky Way tend to be metal-poor. Gamma Piscium is part of the asterism known as the "circlet of Pisces."^[10]

Naming

In Chinese, 霹靂へきれき (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of γがんま Piscium, βべーた Piscium, θしーた Piscium, ιいおた Piscium and ωおめが Piscium. Consequently, the Chinese name for γがんま Piscium itself is 霹靂へきれき二に (Pī Lì èr, English: the Second Star of Thunderbolt.)^[11]

Planetary system

In 2021, a gas giant planet was detected by the radial velocity method.^[12]

The Gamma Piscium planetary system^[12]
Companion (in order from star)	Mass	Semimajor axis (AUえーゆー)	Orbital period (days)	Eccentricity	Inclination	Radius
b	>1.34^+0.02 _−0.31 $M$ _J	1.32^+0.05 _−0.08	555.1^+6.0 _−2.5	0.204^+0.114 _−0.141	—	—

In fiction

In Frank Herbert's Dune series, the fictional planet of Salusa Secundus, the former home system of Imperial House Corrino and later a prison planet, orbits Gamma Waiping (the Chinese name for Pisces).^{[citation needed]}

References

^ ^a ^b ^c 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.
^ ^a ^b ^c ^d Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C
^ ^a ^b Fuhrmann, Klaus; Chini, Rolf (January 2022), "On the Brightest Horizontal Branch Population II Star γがんま Piscium", Research Notes of the AAS, 6 (1): 14, Bibcode:2022RNAAS...6...14F, doi:10.3847/2515-5172/ac4a78, 14.
^ ^a ^b ^c ^d ^e ^f ^g Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155 (1). 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b. S2CID 119427037.
^ Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W
^ van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Vizier catalog entry
^ ^a ^b ^c da Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088
^ "* gam Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 30, 2007.
^ Liu, Y. J.; et al. (December 2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–566, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x, S2CID 121987595.
^ "SPACE.com -- SpaceWatch -- Pisces Rising". Space.com. Archived from the original on July 13, 2010. Retrieved September 30, 2007.
^ (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 Archived 2012-04-15 at the Wayback Machine
^ ^a ^b Teng, Huan-Yu; Sato, Bun'ei; Takarada, Takuya; Omiya, Masashi; Harakawa, Hiroki; Izumiura, Hideyuki; Kambe, Eiji; Takeda, Yoichi; Yoshida, Michitoshi; Itoh, Yoichi; Ando, Hiroyasu; Kokubo, Eiichiro (2022), "Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate", Publications of the Astronomical Society of Japan, 74: 92–127, arXiv:2112.07169, doi:10.1093/pasj/psab112

[GaiaDR3-1] 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.

[saaoc8_59-2] Cousins, A. W. J. (1984), "Standardization of Broadband Photometry of Equatorial Standards", South African Astronomical Observatory Circulars, 8: 59, Bibcode:1984SAAOC...8...59C

[Fuhrmann_Chini_2022-3] Fuhrmann, Klaus; Chini, Rolf (January 2022), "On the Brightest Horizontal Branch Population II Star γがんま Piscium", Research Notes of the AAS, 6 (1): 14, Bibcode:2022RNAAS...6...14F, doi:10.3847/2515-5172/ac4a78, 14.

[Baines2018-4] ^ ^a ^b ^c ^d ^e ^f ^g Baines, Ellyn K.; et al. (2018). "Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 155 (1). 30. arXiv:1712.08109. Bibcode:2018AJ....155...30B. doi:10.3847/1538-3881/aa9d8b. S2CID 119427037.

[scfs-5] Wielen, R.; et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg, 35 (35), Astronomisches Rechen-Institut Heidelberg: 1, Bibcode:1999VeARI..35....1W

[aaa474_2_653-6] van Leeuwen, Floor (13 August 2007). "Validation of the new Hipparcos reduction". Astronomy & Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. eISSN 1432-0746. ISSN 0004-6361. Vizier catalog entry

[aaa458_2_609-7] Silva, L.; et al. (November 2006), "Basic physical parameters of a selected sample of evolved stars", Astronomy and Astrophysics, 458 (2): 609–623, arXiv:astro-ph/0608160, Bibcode:2006A&A...458..609D, doi:10.1051/0004-6361:20065105, S2CID 9341088

[SIMBAD-8] "* gam Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved September 30, 2007.

[Liu_et_al_2007-9] Liu, Y. J.; et al. (December 2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–566, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x, S2CID 121987595.

[10] "SPACE.com -- SpaceWatch -- Pisces Rising". Space.com. Archived from the original on July 13, 2010. Retrieved September 30, 2007.

[11] (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 Archived 2012-04-15 at the Wayback Machine

[Teng2021-12] Teng, Huan-Yu; Sato, Bun'ei; Takarada, Takuya; Omiya, Masashi; Harakawa, Hiroki; Izumiura, Hideyuki; Kambe, Eiji; Takeda, Yoichi; Yoshida, Michitoshi; Itoh, Yoichi; Ando, Hiroyasu; Kokubo, Eiichiro (2022), "Regular radial velocity variations in nine G- and K-type giant stars: Eight planets and one planet candidate", Publications of the Astronomical Society of Japan, 74: 92–127, arXiv:2112.07169, doi:10.1093/pasj/psab112

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Observation data Epoch J2000.0 Equinox J2000.0
Location of γがんま Piscium (circled)
Constellation	Pisces
Right ascension	23^h 17^m 09.937^s^[1]
Declination	+03° 16′ 56.25″^[1]
Apparent magnitude (V)	3.699^[2]
Characteristics
Evolutionary stage	Horizontal branch^[3]
Spectral type	G8 III^[4]
U−B color index	+0.572 ^[2]
B−V color index	+0.924^[2]
Astrometry

Radial velocity (R_v)	−13.6^[5] km/s
Proper motion (μみゅー)	RA: 759.268 mas/yr^[1] Dec.: 17.568 mas/yr^[1]
Parallax (πぱい)	24.1958 ± 0.2967 mas^[6]
Distance	135 ± 2 ly (41.3 ± 0.5 pc)
Absolute magnitude (M_V)	0.68±0.08^[7]

Details

Mass	0.97±0.12^[3] `M`_☉
Radius	11.28±0.10^[4] `R`_☉
Luminosity	62.7±3.3^[4] `L`_☉
Surface gravity (log g)	2.43 ± 0.06^[7] cgs
Temperature	4833±62^[4] K
Metallicity [Fe/H]	−0.51^[7] dex
Age	4.58±3.10^[4] Gyr

Other designations
Gamma Psc, γがんま Piscium, γがんま Psc, 6 Piscium, BD+02°4648, FK5 878, GC 32415, HD 219615, HIP 114971, HR 8852, SAO 128085, PPM 173938, 2MASS J23170996+0316563^[8]
Database references
SIMBAD	data