Upsilon Piscium

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Upsilon Piscium
Pisces IAU.svg
Red circle.svg
Location of υ Piscium (circled)
Observation data
Epoch J2000.0        Equinox J2000.0 (ICRS)
Constellation Pisces
Right ascension 01h 19m 27.99289s [1]
Declination +27° 15′ 50.6155″ [1]
Apparent magnitude  (V)4.752 [2]
Characteristics
Spectral type A3 V [3]
U−B color index +0.10 [2]
B−V color index +0.03 [2]
Astrometry
Radial velocity (Rv)+5.8±2.7 [4]  km/s
Proper motion (μ)RA: +22.98 [1]   mas/yr
Dec.: −11.12 [1]   mas/yr
Parallax (π)10.59 ± 0.25  mas [1]
Distance 308 ± 7  ly
(94 ± 2  pc)
Absolute magnitude  (MV)−0.13 [5]
Details
Mass 2.84±0.05 [3]   M☉
Radius 2.2 [6]   R☉
Luminosity 117 [3]   L☉
Surface gravity (log g)3.59 [7]   cgs
Temperature 9,183±312 [7]   K
Metallicity [Fe/H]+0.00±0.05 [8]   dex
Rotational velocity (v sin i)91 [3]  km/s
Age 461 [7]   Myr
Other designations
υ Psc, 90 Piscium, BD+26° 220, FK5  45, HD  7964, HIP  6193, HR  383, SAO  74637 [9]
Database references
SIMBAD data

Upsilon Piscium is a solitary, [10] white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +4.75. [2] Based upon an annual parallax shift of 10.59  mas as seen from Earth, [1] it is located about 308  light years from the Sun. The star is drifting further away with a heliocentric radial velocity of +6 km/s. [4]

This is an ordinary A-type main sequence star with a stellar classification of A3 V. [3] It is 461 [7] million years old – about 98% of the way through its main sequence lifetime [3] – and is spinning with a projected rotational velocity of 91 km/s. [3] The star has 2.8 [3] times the mass of the Sun, about 2.2 [6] times the Sun's radius, and is radiating 117 [3] times the Sun's luminosity from its photosphere at an effective temperature of 9183 K. [7]

Naming

υ Piscium is the Bayer designation for this star, which is Latinized as Upsilon Piscium. It has the Flamsteed designation 90 Piscium. [9]

In Chinese, 奎宿 (Kuí Sù), meaning Legs (asterism), refers to an asterism composed of υ Piscium, η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, the Chinese name for υ Piscium itself is 奎宿十三 (Kuí Sù shí sān, English: the Thirteenth Star of Legs.) [11]

Related Research Articles

<span class="mw-page-title-main">Mirach</span> Star in the constellation Andromeda

Mirach, Bayer designation Beta Andromedae, Latinized from β Andromedae, is a prominent star in the northern constellation of Andromeda. It is northeast of the Great Square of Pegasus and is potentially visible to all observers north of latitude 54° S. It is commonly used by stargazers to find the Andromeda Galaxy. The galaxy NGC 404, also known as Mirach's Ghost, is seven arcminutes away from Mirach.

<span class="mw-page-title-main">Upsilon Tauri</span> Star in the constellation of Taurus

Upsilon Tauri is a solitary, white-hued star in the zodiac constellation of Taurus, and is a member of the Hyades star cluster. It is faintly visible to the naked eye with an apparent visual magnitude of +4.3. Based upon an annual parallax shift of 21.21 mas seen from Earth, it is around 154 light years from the Sun.

<span class="mw-page-title-main">Upsilon Ursae Majoris</span> Binary star in the constellation Ursa Major

Upsilon Ursae Majoris, Latinized from υ Ursae Majoris, is a binary star in the northern circumpolar constellation of Ursa Major. It is visible to the naked eye with an apparent visual magnitude of +3.79. Based upon an annual parallax shift of 13.24 mas, it is located roughly 246 light-years from the Sun.

<span class="mw-page-title-main">Delta Andromedae</span> Multiple star system in the constellation Andromeda

Delta Andromedae, Latinized from δ Andromedae, is a triple star system in the northern constellation of Andromeda. The system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.28. Based upon parallax measurements, it is located at a distance of approximately 105.5 light-years from the Sun. The system is drifting closer with a radial velocity of −10 km/s.

<span class="mw-page-title-main">Mu Andromedae</span> Binary star in the constellation Andromeda

Mu Andromedae is the Bayer designation for a star in the northern constellation of Andromeda. It has an apparent visual magnitude of 3.87, making it readily visible to the naked eye. Based upon parallax measurements, it is approximately 130 light-years from Earth. In the constellation, the star is situated about halfway between the bright star Mirach to the southwest and the Andromeda Galaxy (M31) to the northeast.

<span class="mw-page-title-main">Zeta Andromedae</span> Star system in the constellation Andromeda

Zeta Andromedae is a star system in the constellation Andromeda. It is approximately 189 light-years from Earth.

<span class="mw-page-title-main">Epsilon Andromedae</span> Star in the constellation Andromeda

Epsilon Andromedae, Latinized from ε Andromedae, is a star in the constellation of Andromeda. It can be seen with the naked eye, having an apparent visual magnitude of 4.4. Based upon an annual parallax shift of 21.04 mas as seen from Earth, it is located 155 light years from the Sun. The system is moving closer to the Sun with a radial velocity of −84 km/s. Its orbit in the Milky Way is highly eccentric, causing it to move rapidly relative to the Sun and its neighboring stars.

<span class="mw-page-title-main">Pi Andromedae</span> Binary star system in the constellation Andromeda

Pi Andromedae is the Bayer designation for a binary star system in the northern constellation of Andromeda. With an apparent visual magnitude of 4.4, it is visible to the naked eye. It is located approximately 580 light-years from Earth.

<span class="mw-page-title-main">Nu Andromedae</span> Binary star in the constellation Andromeda

Nu Andromedae is a binary star in the constellation Andromeda. The system has an apparent visual magnitude of 4.5, which is bright enough to be seen with the naked eye. It is approximately 620 light-years from Earth. Situated just over a degree to the west of this star is the Andromeda Galaxy.

<span class="mw-page-title-main">28 Andromedae</span> Star in the constellation Andromeda

28 Andromedae is a Delta Scuti variable star in the constellation Andromeda. 28 Andromedae is the Flamsteed designation. It also bears the variable star name GN Andromedae. Its apparent magnitude is 5.214, varying by less than 0.1 magnitudes.

23 Andromedae, abbreviated 23 And, is a presumed single star in the constellation Andromeda, although it has been a suspected spectroscopic binary. 23 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.71, which indicates it is dimly visible to the naked eye under good viewing conditions. The distance to 23 And, as determined from its annual parallax shift of 26.8 mas, is 121.6 light years. The star is moving further from the Earth with a heliocentric radial velocity of −27 km/s. It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.191″ per year.

39 Aurigae is a single star in the constellation of Auriga. The designation is from the star catalogue of English astronomer John Flamsteed, first published in 1712. The star is just barely visible to the naked eye, having an apparent visual magnitude of 5.90. Based upon an annual parallax shift of 20.11 mas as seen from Earth, it is located 112 light years away. 5 Andromedae is moving further from the Sun with a radial velocity of +34 km/s. It has a relatively high proper motion, advancing across the celestial sphere at the rate of 0.151 arc seconds per year.

Upsilon Andromedae d, formally named Majriti, is a super-Jupiter exoplanet orbiting within the habitable zone of the Sun-like star Upsilon Andromedae A, approximately 44 light-years away from Earth in the constellation of Andromeda. Its discovery made it the first multiplanetary system to be discovered around a main-sequence star, and the first such system known in a multiple star system. The exoplanet was found by using the radial velocity method, where periodic Doppler shifts of spectral lines of the host star suggest an orbiting object.

<span class="mw-page-title-main">Phi Piscium</span> Quadruple star system in the constellation Pisces

Phi Piscium, Latinized from φ Piscium, is a quadruple star system approximately 380 light years away in the constellation Pisces. It consists of Phi Piscium A, with a spectral type of K0III, and Phi Piscium B. Phi Piscium A possesses a surface temperature of 3,500 to 5,000 kelvins. Some suggest the only visible companion in the Phi Piscium B sub-system is a late F dwarf star, while others suggest it is a K0 star. The invisible component of the Phi Piscium B sub-system is proposed to have a spectral type of M2V. The star system has a period of about 20½ years and has a notably high eccentricity of 0.815.

<span class="mw-page-title-main">Sigma Piscium</span> Star in the constellation Pisces

Sigma Piscium is a main-sequence star in the zodiac constellation of Pisces. It has an apparent magnitude of +5.50, meaning it is barely visible to the naked eye, according to the Bortle scale. While parallax measurements by the Hipparcos spacecraft give a distance of approximately 430 light years, dynamical parallax measurements put it slightly closer, at 368 light-years from Earth.

<span class="mw-page-title-main">Tau Piscium</span> Orange-hued star in the constellation Pisces

Tau Piscium (τ Piscium) is an orange-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of +4.52, it is a dim star but visible to the naked eye. Based upon an annual parallax shift of 19.32 mas as seen from Earth, it is located around 169 light years from the Sun. It is most likely a member of the thin disk population.

<span class="mw-page-title-main">Chi Piscium</span> Yellow-hued giant star in the constellation Pisces

Chi Piscium (χ Piscium) is a solitary, orange-hued star in the zodiac constellation of Pisces. It can be seen with the naked eye, having an apparent visual magnitude of +4.64. Based upon an annual parallax shift of 8.50 mas as seen from Earth, it is located about 384 light years from the Sun.

<span class="mw-page-title-main">Rho Piscium</span> Star in the constellation Pisces

Rho Piscium is a solitary, yellow-hued star in the zodiac constellation of Pisces. With an apparent visual magnitude of +5.34, it is faintly visible to the naked eye. Based upon an annual parallax shift of 39.66 mas as seen from Earth, it is located 82 light years from the Sun. It is a member of the thin disk population of the Milky Way.

Psi<sup>1</sup> Piscium Binary star in the constellation Pisces

Psi1 Piscium is a binary star in the constellation Pisces. It is approximately 280 light years from Earth, based on its parallax.

Psi<sup>2</sup> Piscium Binary star system in the constellation Pisces

Psi2 Piscium (ψ2 Piscium) is a white-hued star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of +5.56. Based upon an annual parallax shift of 8.66 mas as seen from Earth, it is located about 380 light years from the Sun. It has a peculiar velocity of 14.6±2.9 km/s, indicating it is a runaway star.

References

  1. 1 2 3 4 5 6 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. 1 2 3 4 Johnson, H. L.; et al. (1966), "UBVRIJKL photometry of the bright stars", Communications of the Lunar and Planetary Laboratory, 4 (99): 99, Bibcode:1966CoLPL...4...99J.
  3. 1 2 3 4 5 6 7 8 9 Zorec, J.; Royer, F. (January 2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv: 1201.2052 , Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID   55586789.
  4. 1 2 de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv: 1208.3048 , Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID   59451347, A61.
  5. ↑ 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.
  6. 1 2 Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv: astro-ph/0012289 , Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID   425754.
  7. 1 2 3 4 5 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv: 1501.03154 , Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID   33401607.
  8. ↑ Morossi, C.; et al. (September 2002), "Metallicity Determinations from Ultraviolet-Visual Spectrophotometry. I. The Test Sample", The Astrophysical Journal, 577 (1): 377–388, Bibcode:2002ApJ...577..377M, doi: 10.1086/342144 .
  9. 1 2 "ups Psc". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2017-07-24.
  10. ↑ 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.
  11. ↑ (in Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
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