pi Piscium

{{Starbox begin

| name = Pi 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=π Psc

| x=313 | y=410

}}

| caption=Location of π Piscium (circled)

}}

{{Starbox observe

| epoch = J2000.0

| equinox = J2000.0 (ICRS)

| constell = Pisces

| ra = {{RA|01|37|05.91523}}

| dec = {{DEC|+12|08|29.5186}}

| appmag_v = 5.60 (5.56 + 9.56)

}}

{{Starbox character

| class = F0 V + KV

| b-v =

| u-b =

| variable =

}}

{{Starbox astrometry

| radial_v = −1.0

| prop_mo_ra = −77.29

| prop_mo_dec = +9.13

| parallax = 28.50

| p_error = 0.97

| parallax_footnote =

| absmag_v = +2.94

}}

{{Starbox detail

| source =

| component1 = A

| mass = 1.42

| radius = {{solar radius calculator|type=LT|5.45|6810|decimals=2}}{{efn|name=radius}}

| luminosity = 5.45{{efn|name=luminosity}}

| temperature = 6,810

| gravity = 4.16

| metal_fe = {{val|-0.10}}

| rotational_velocity = 105.9

| age_gyr = 2.0

| component2 = B

| mass2 = 0.75

| radius2 = {{solar radius calculator|type=LT|0.207|4700|decimals=2}}{{efn|name=radius}}

| temperature2 = 4,700

| luminosity2 = 0.207{{efn|name=luminosity}}

}}

{{Starbox catalog

| names = {{odlist | B=π Psc | F=102 Piscium | BD=+11°205 | FK5=1046 | HD=9919 | HIP=7535 | HR=463 | SAO=92536 | GC=1954 | PPM=117498 }}

}}

{{Starbox reference

| Simbad=HD+9919

}}

Pi Piscium (π Piscium) is a spectroscopic binary star in the zodiac constellation of Pisces. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.60. Based upon an annual parallax shift of 28.50 mas as seen from Earth, it is 114 light years distant. It is a member of the thin disk population of the Milky Way.

The primary, of apparent magnitude 5.56, is an ordinary F-type main-sequence star with a stellar classification of F0 V. At the estimated age of two billion years, it is about 55% of the way through its main sequence lifetime and still has a relatively high rate of spin with a projected rotational velocity of 105.9 km/s. The star has 1.42 times the mass of the Sun and {{solar radius calculator|type=LT|5.45|6810|decimals=2}}{{efn|name=radius}} of the Sun's radius. It is radiating 5.5{{efn|name=luminosity}} times the Sun's luminosity at an effective temperature of 6,810 K. At that temperature, Pi Piscium A has a yellow-white hue, as many F-type stars.

The secondary, of apparent magnitude 9.56, is a K-dwarf star. It is 0.75 times as massive than the Sun, {{solar radius calculator|type=LT|5.45|6810|decimals=2}}{{efn|name=radius}} times as large, and has 21%{{efn|name=luminosity}} of the luminosity. Its effective temperature is 4,700 K, giving it an orange hue typical of K-type stars.

Analysis of its motion suggest Pi Piscium may be a member of the Ursa Major association, but higher-quality observations are needed to confirm this.

Naming

In Chinese, {{lang|zh|右更}} ({{lang|zh-Latn|Yòu Gèng}}), meaning Official in Charge of the Pasturing, refers to an asterism consisting of π Piscium, η Piscium, ρ Piscium, ο Piscium and 104 Piscium. Consequently, the Chinese name for π Piscium itself is {{lang|zh|右更三}} ({{lang|zh-Latn|Yòu Gèng sān}}, {{langx|en|the Third Star of Official in Charge of the Pasturing}}.){{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 }}

Notes

{{Notelist|notes=

{{Efn|name=luminosity|1=Calculated from the equation L = 10^{0.4{{*}}(4.74 − M_bol}, where M_bol is the absolute bolometric magnitude. For component A, a value of 2.90 is used, while for B a value of 6.45 is used.}}

{{Efn|name=radius|1=Calculated, using the Stefan-Boltzmann law and the star's effective temperature and luminosity, with respect to the solar nominal effective temperature of 5,772 K: $\sqrt{\biggl(\frac{5,772}{6,810}\biggr)^4 \cdot 5.45} = 1.68\ R_\odot.$ $\sqrt{\biggl(\frac{5,772}{4,700}\biggr)^4 \cdot 0.207} = 0.69\ R_\odot.$ }}

}}

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