Delta Piscium
{{short description|Star in the constellation Pisces}}
{{Starbox begin
| name = Delta Piscium
}}
{{Starbox image
| image =
{{Location mark
| image=Pisces IAU.svg | alt= | float=center | width=250
| label= | position=right
| mark=Red circle.svg | mark_width=10 | mark_link=δ Psc
| x=460 | y=475
}}
| caption=Location of δ Piscium (circled)
}}
{{Starbox observe
| epoch = J2000.0
| constell = Pisces
}}
{{Starbox character
| variable =
}}
{{Starbox astrometry
| radial_v = {{Val|+32.45|0.18}}
| prop_mo_ra = +81.994
| prop_mo_dec = −50.232
| parallax = 10.8577
| p_error = 0.1787
| parallax_footnote = {{Cite DR3|2556759229189045632}}
}}
{{Starbox detail
| radius = {{val|38.01|0.71|0.73}}
| luminosity = {{val|291.7|13.3}}
| temperature = {{val|3868|35}}
}}
{{Starbox catalog
| names = {{odlist | B=δ Psc | F=63 Piscium | BD=+06°107 | FK5=28 | HD=4656 | HIP=3786 | HR=224 | SAO=109474 | WDS=J00487+0735A }}
}}
{{Starbox reference
| Simbad = del+Psc
}}
{{Starbox end}}
Delta Piscium (δ Piscium) is a solitary, orange-hued star in the zodiac constellation of Pisces. It has an apparent visual magnitude of +4.4, so it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 10.86 mas, it is around {{Convert|300|ly|pc|abbr=off|lk=on}} from the Sun. The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.
This is an evolved K-type giant star with a stellar classification of K4 IIIb. It has around 1.65 times the mass of the Sun and, at the age of three billion years, has expanded to 38 times the Sun's radius. The star is radiating 292 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,868 K.
Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations. It has a magnitude 13.99 visual companion at an angular separation of 135.0 arc seconds on a position angle of 12°, as of 2011.
Naming
In Chinese, {{lang|zh|外屏}} ({{lang|zh-Latn|Wài Píng}}), meaning Outer Fence, refers to an asterism of stars, δ Piscium, ε Piscium, ζ Piscium, μ Piscium, ν Piscium, ξ Piscium and α Piscium. Consequently, the Chinese name for δ Piscium itself is {{lang|zh|外屏一}} ({{lang|zh-Latn|Wài Píng yī}}, {{langx|en|the First Star of Outer Fence}}.){{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0605/ap060519.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日] {{Webarchive|url=https://web.archive.org/web/20160303170659/http://aeea.nmns.edu.tw/2006/0605/ap060519.html |date=2016-03-03 }}
References
{{reflist|refs=
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | doi=10.1134/S1063773712050015
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| bibcode=1995A&AS..110..107M
| postscript=. }}
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| last6=Dejonghe | first6=H. | last7=Turon | first7=C.
| title=Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters
| journal=Astronomy and Astrophysics
| volume=430 | pages=165–186 | date=2005
| doi=10.1051/0004-6361:20041272
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| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | bibcode=2008MNRAS.389..869E
| arxiv=0806.2878 | s2cid=14878976 | postscript=. }}
| title=Abundances in the Local Region. I. G and K Giants
| journal=The Astronomical Journal
| last1=Luck | first1=R. Earle | postscript=.
| volume=150 | issue=3 | pages=88 | year=2015
| bibcode=2015AJ....150...88L | doi=10.1088/0004-6256/150/3/88 |arxiv = 1507.01466 | s2cid=118505114
}}
{{citation | display-authors=1
| last1=Massarotti | first1=Alessandro | last2=Latham | first2=David W.
| last3=Stefanik | first3=Robert P. | last4=Fogel | first4=Jeffrey
| title=Rotational and radial velocities for a sample of 761 HIPPARCOS giants and the role of binarity
| journal=The Astronomical Journal | postscript=.
| volume=135 | issue=1 | pages=209–231 | date=January 2008
| doi=10.1088/0004-6256/135/1/209 | bibcode=2008AJ....135..209M | doi-access=free }}
| title=Standardisation of broad band photometry of equatorial standards
| journal=South Africa Astronomical Observatory Circular
| volume=8 | pages=59–67 | year=1984
| bibcode=1984SAAOC...8...59C | postscript=.
| last1=Cousins | first1=A. W. J. }}
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog
| year=2014 | bibcode=2001AJ....122.3466M
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| accessdate=2015-07-22 | doi = 10.1086/323920 | volume=122 | journal=The Astronomical Journal | issue=6 | pages=3466–3471| doi-access=free }}
| title=del Psc | accessdate=2017-07-31 | postscript=. }}
}}
External links
- {{citation
| first1=James B. | last1=Kaler | date=January 6, 2012
| work=STARS | publisher=University of Illinois | postscript=.
| url=http://stars.astro.illinois.edu/sow/deltapsc.html
| title=DELTA PSC (Delta Piscium) | accessdate=2017-08-02 }}
{{Stars of Pisces|state=collapsed}}
{{DEFAULTSORT:Delta Piscium}}
Category:Pisces (constellation)