| absmag_v = −0.46[11]
}}{{Starbox detail
| source = [7]
| mass = 1.65[4]
| radius = 44
| luminosity = 447
| gravity = 1.0
| temperature = {{Val|3963|4|fmt=commas}}
| metal_fe = −0.20
| rotational_velocity = 5.5
| age_myr = 2.98[4]
}}{{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 }}[15]
}}{{Starbox reference
| Simbad = eps+Psc
}}{{Starbox end}}Delta Piscium (δ Piscium) is a solitary,[16] orange-hued star in the zodiac constellation of Pisces. It has an apparent visual magnitude of +4.4,[3] so it is bright enough to be faintly visible to the naked eye. Based upon an annual parallax shift of 10.5 mas, it is around {{Convert|311|ly|pc|abbr=off|lk=on}} from the Sun.[15] The visual magnitude of the star is diminished by an interstellar absorption factor of 0.08 due to interstellar dust.[19]This is an evolved K-type giant star with a stellar classification of K4 IIIb.[4] It has around 1.65 times the mass of the Sun and, at the age of three billion years,[4] has expanded to 44[7] times the Sun's radius. The star is radiating 447 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,963 K.[7]
Because Delta Piscium is positioned near the ecliptic, so it is subject to lunar occultations.[24] 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.[25]
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, δ Piscium itself is known as {{lang|zh|外屏一}} ({{lang|zh-Latn|Wài Píng yī}}, {{lang-en|the First Star of Outer Fence}}.)[1]
References
1. ^{{zh icon}} AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 5 月 19 日
2. ^1 {{citation | 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 | arxiv=1108.4971 | postscript=. }}
3. ^1 {{citation | display-authors=1 | last1=Meyer | first1=C. | last2=Rabbia | first2=Y. | last3=Froeschle | first3=M. | last4=Helmer | first4=G. | last5=Amieux | first5=G. | title=Observations of lunar occultations at Observatoire de la Cote d'Azur | journal=Astronomy and Astrophysics Supplement | volume=110 | pages=107 | year=1995 | bibcode=1995A&AS..110..107M | postscript=. }}
4. ^1 {{citation | display-authors=1 | last1=Famaey | first1=B. | last2=Jorissen | first2=A. | last3=Luri | first3=X. | last4=Mayor | first4=M. | last5=Udry | first5=S. | 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 | bibcode=2005A&A...430..165F | arxiv=astro-ph/0409579 | postscript=. }}
5. ^1 {{citation | last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A. | 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 | bibcode=2008MNRAS.389..869E | arxiv=0806.2878 | postscript=. }}
6. ^1 2 3 4 5 {{citation | 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 }}
7. ^1 2 3 4 {{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 }}
8. ^1 2 3 4 {{citation | 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. }}
9. ^1 {{citation | 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 | pages=3466–3471}}
10. ^1 2 {{cite simbad | title=del Psc | accessdate=2017-07-31 | postscript=. }}