Iota Piscium
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 39m 57.04138s[2] |
| Declination | +05° 37′ 34.6475″[2] |
| Apparent magnitude (V) | 4.13[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F7 V[3] |
| U−B color index | −0.01[4] |
| B−V color index | +0.50[4] |
| Astrometry | |
| Radial velocity (Rv) | +5.4[5] km/s |
| Proper motion (μ) | RA: 377.15±0.19[2] mas/yr Dec.: −437.43±0.15[2] mas/yr |
| Parallax (π) | 72.92±0.15 mas[2] |
| Distance | 44.73 ± 0.09 ly (13.71 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.43[6] |
| Details | |
| Mass | 1.15+0.14 −0.04[7] M☉ |
| Radius | 1.595±0.014[8] R☉ |
| Luminosity | 3.555±0.058[8] L☉ |
| Surface gravity (log g) | 4.11[9] cgs |
| Temperature | 6,288±37[8] K |
| Metallicity [Fe/H] | −0.12[9] dex |
| Rotational velocity (v sin i) | 6.67[10] km/s |
| Age | 5.19+0.80 −2.15[7] Gyr |
| Other designations | |
| ι Psc, 17 Psc, BD+04°5035, FK5 892, GC 32879, GJ 904, HD 222368, HIP 116771, HR 8969, SAO 128310, PPM 174312, CCDM J23399+0538A, WDS J23399+0538A, IDS 23348+0505 A[1] | |
| Database references | |
| SIMBAD | data |
Iota Piscium (Iota Psc, ι Piscium, ι Psc) is a star located in the constellation Pisces. With an apparent magnitude of +4.13, it is visible to the naked eye. Parallax measurements give a distance of 44.73 light-years.
Its spectral type is F7V,[3] with the luminosity class V suggesting it is in the main sequence, fusing atoms of hydrogen into helium. The star has 1.15 times the Sun's mass and 1.60 times the Sun's radius. It is radiating 3.6 times the Sun's luminosity at an effective temperature of 6,288 K.[8] It is a suspected variable star.[11]
The star was once thought to have one or two stellar companions, but both are line-of-sight coincidences.[11] It displays a far-infrared excess at a wavelength of 70μm, suggesting it is being orbited by a cold debris disk.[12]
Naming
In Chinese, 霹靂 (Pī Lì), meaning Thunderbolt, refers to an asterism consisting of ι Piscium, β Piscium, γ Piscium, θ Piscium, and ω Piscium. Consequently, the Chinese name for ι Piscium itself is 霹靂四 (Pī Lì sì, English: the Fourth Star of Thunderbolt.)[13]
References
- ^ a b "* iot Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved April 4, 2007.
- ^ a b c d e 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 Vizier catalog entry
- ^ a b c Gray, R. O.; Napier, M. G.; Winkler, L. I. (April 2001), "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars", The Astronomical Journal, 121 (4): 2148–2158, Bibcode:2001AJ....121.2148G, doi:10.1086/319956.
- ^ a b Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV Data, Bibcode:1986EgUBV........0M
- ^ Nordström, Andersen; et al. (2004), "The Geneva-Copenhagen survey of the Solar neighbourhood. Ages, metallicities, and kinematic properties of ~14000 F and G dwarfs", Publications of the Astronomical Society of Australia, 21 (2): 129–133, arXiv:0811.3982, Bibcode:2004PASA...21..129N, doi:10.1071/AS04013, S2CID 123457673.
- ^ Paunzen, E.; et al. (July 2014), "Investigating the possible connection between λ Bootis stars and intermediate Population II type stars", Astronomy & Astrophysics, 567: 8, arXiv:1406.3936, Bibcode:2014A&A...567A..67P, doi:10.1051/0004-6361/201423817, S2CID 56332289, A67.
- ^ a b Harada, Caleb K.; et al. (June 2024), "Setting the Stage for the Search for Life with the Habitable Worlds Observatory: Properties of 164 Promising Planet-survey Targets", The Astrophysical Journal Supplement Series, 272 (2), id. 30, arXiv:2401.03047, Bibcode:2024ApJS..272...30H, doi:10.3847/1538-4365/ad3e81.
- ^ a b c d Boyajian, Tabetha S.; et al. (February 2012), "Stellar Diameters and Temperatures. I. Main-sequence A, F, and G Stars", The Astrophysical Journal, 746 (1): 101, arXiv:1112.3316, Bibcode:2012ApJ...746..101B, doi:10.1088/0004-637X/746/1/101, S2CID 18993744. See Table 10.
- ^ a b Ramírez, I.; et al. (February 2013), "Oxygen abundances in nearby FGK stars and the galactic chemical evolution of the local disk and halo", The Astrophysical Journal, 764 (1): 78, arXiv:1301.1582, Bibcode:2013ApJ...764...78R, doi:10.1088/0004-637X/764/1/78, S2CID 118751608
- ^ Martínez-Arnáiz, R.; et al. (September 2010), "Chromospheric activity and rotation of FGK stars in the solar vicinity. An estimation of the radial velocity jitter" (PDF), Astronomy and Astrophysics, 520: A79, arXiv:1002.4391, Bibcode:2010A&A...520A..79M, doi:10.1051/0004-6361/200913725, S2CID 43455849, archived from the original (PDF) on 2017-09-22, retrieved 2018-11-04
- ^ a b Kaler, James B., "Iota Piscium", Stars, University of Illinois, archived from the original on January 25, 2007, retrieved September 27, 2007
- ^ Nuñez, Paul D.; et al. (September 2017), "A near-infrared interferometric survey of debris-disk stars. VI. Extending the exozodiacal light survey with CHARA/JouFLU", Astronomy & Astrophysics, 608 (113): A113, arXiv:1709.01655, Bibcode:2017A&A...608A.113N, doi:10.1051/0004-6361/201730859, S2CID 44229077
- ^ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 8 日 Archived 2012-04-15 at the Wayback Machine