| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 20m 20.58306s [1] |
| Declination | +05° 22′ 52.7000″ [1] |
| Apparent magnitude (V) | 5.069 [2] |
| Characteristics | |
| Spectral type | K1 IV [3] |
| U−B color index | +1.12 [4] |
| B−V color index | +1.204±0.002 [5] |
| Astrometry | |
| Radial velocity (Rv) | 40.46±0.18 [1] km/s |
| Proper motion (μ) |
RA: 78.829
[1]
mas/
yr Dec.: −59.228 [1] mas/ yr |
| Parallax (π) | 9.5042 ± 0.1880 mas [1] |
| Distance | 343 ± 7
ly (105 ± 2 pc) |
| Absolute magnitude (MV) | −0.56 [5] |
| Details [6] | |
| Mass | 1.37 [7] M☉ |
| Radius | 22.06+1.38 −3.16 [1] R☉ |
| Luminosity | 163±4 [1] L☉ |
| Surface gravity (log g) | 1.81±0.28 cgs |
| Temperature | 4,314±80 K |
| Metallicity [Fe/H] | −0.71±0.12 dex |
| Age | 4.58 [7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
7 Piscium is a single [9] star in the zodiac constellation of Pisces, [8] located around 343 light-years away from the Sun. [1] It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07. [2] It is moving further from the Earth with a heliocentric radial velocity of 40 km/s. [1]
This is a metal-deficient giant star [10] with a stellar classification of K1 IV. [3] It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through the fusion of helium at its core. [11] The star is 4.58 billion years old with 1.37 times the mass of the Sun. [7] It has 22 [1] times the Sun's radius and is radiating 163 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,314 K. [6]
References
- ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode: 1999MSS...C05....0H.
- ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode: 1966CoLPL...4...99J.
- ^ a b 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 Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv: 1104.4952, Bibcode: 2011A&A...531A.165P, doi: 10.1051/0004-6361/201116769, S2CID 54940439.
- ^ a b c Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ a b "7 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-25.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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.
- ^ Smiljanic, R.; Porto de Mello, G. F.; da Silva, L. (June 2007), "Abundance analysis of barium and mild barium stars", Astronomy & Astrophysics, 468 (2): 679–693, arXiv: astro-ph/0702421, Bibcode: 2007A&A...468..679S, doi: 10.1051/0004-6361:20065867, S2CID 5863942
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Pisces |
| Right ascension | 23h 20m 20.58306s [1] |
| Declination | +05° 22′ 52.7000″ [1] |
| Apparent magnitude (V) | 5.069 [2] |
| Characteristics | |
| Spectral type | K1 IV [3] |
| U−B color index | +1.12 [4] |
| B−V color index | +1.204±0.002 [5] |
| Astrometry | |
| Radial velocity (Rv) | 40.46±0.18 [1] km/s |
| Proper motion (μ) |
RA: 78.829
[1]
mas/
yr Dec.: −59.228 [1] mas/ yr |
| Parallax (π) | 9.5042 ± 0.1880 mas [1] |
| Distance | 343 ± 7
ly (105 ± 2 pc) |
| Absolute magnitude (MV) | −0.56 [5] |
| Details [6] | |
| Mass | 1.37 [7] M☉ |
| Radius | 22.06+1.38 −3.16 [1] R☉ |
| Luminosity | 163±4 [1] L☉ |
| Surface gravity (log g) | 1.81±0.28 cgs |
| Temperature | 4,314±80 K |
| Metallicity [Fe/H] | −0.71±0.12 dex |
| Age | 4.58 [7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
7 Piscium is a single [9] star in the zodiac constellation of Pisces, [8] located around 343 light-years away from the Sun. [1] It has the Bayer designation b Piscium; 7 Piscium is the Flamsteed designation. This object is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.07. [2] It is moving further from the Earth with a heliocentric radial velocity of 40 km/s. [1]
This is a metal-deficient giant star [10] with a stellar classification of K1 IV. [3] It is a red clump giant, which indicates it is on the horizontal branch and is generating energy through the fusion of helium at its core. [11] The star is 4.58 billion years old with 1.37 times the mass of the Sun. [7] It has 22 [1] times the Sun's radius and is radiating 163 [1] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,314 K. [6]
References
- ^ a b c d e f g h i j k l Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode: 2000A&A...355L..27H.
- ^ a b Houk, N.; Swift, C. (1999). "Michigan catalogue of two-dimensional spectral types for the HD Stars, Vol. 5". Michigan Spectral Survey. 5. Bibcode: 1999MSS...C05....0H.
- ^ Johnson, H. L. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode: 1966CoLPL...4...99J.
- ^ a b 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 Prugniel, Ph.; et al. (July 2011), "The atmospheric parameters and spectral interpolator for the MILES stars", Astronomy & Astrophysics, 531: A165, arXiv: 1104.4952, Bibcode: 2011A&A...531A.165P, doi: 10.1051/0004-6361/201116769, S2CID 54940439.
- ^ a b c Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", The Astronomical Journal, 150 (3): 88, arXiv: 1507.01466, Bibcode: 2015AJ....150...88L, doi: 10.1088/0004-6256/150/3/88, S2CID 118505114.
- ^ a b "7 Psc". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-03-25.
- ^ Eggleton, P. P.; Tokovinin, A. A. (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.
- ^ Smiljanic, R.; Porto de Mello, G. F.; da Silva, L. (June 2007), "Abundance analysis of barium and mild barium stars", Astronomy & Astrophysics, 468 (2): 679–693, arXiv: astro-ph/0702421, Bibcode: 2007A&A...468..679S, doi: 10.1051/0004-6361:20065867, S2CID 5863942
- ^ Alves, David R. (August 2000), "K-Band Calibration of the Red Clump Luminosity", The Astrophysical Journal, 539 (2): 732–741, arXiv: astro-ph/0003329, Bibcode: 2000ApJ...539..732A, doi: 10.1086/309278, S2CID 16673121.
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