Rho Persei

{{Starbox begin

| name = ρ Persei

}}

{{Starbox image

|image=

{{Location mark

|image=Perseus constellation map.svg|alt=|float=center|width=280

|label=|position=right

|mark=Red circle.svg|mark_width=10|mark_link=ρ Persei

|x=665|y=719

}}

|caption=Location of ρ Persei (circled)

}}

{{Starbox observe

| epoch = J2000

| ra = {{RA|03|05|10.59385}}

| dec = {{DEC|+38|50|24.9943}}

| appmag_v = +3.39

| constell = Perseus

}}

{{Starbox character

| type = AGB

| class = M4 II

| b-v = +1.65

| u-b = +1.79

| variable = SRb

}}

{{Starbox astrometry

| radial_v = {{val|+29.10|0.30}}

| prop_mo_ra = +129.22

| prop_mo_dec = {{nowrap|–105.70}}

| parallax = 10.60

| p_error = 0.25

| parallax_footnote =

| absmag_v = −1.7

}}

{{Starbox detail

| source =

| mass = {{val|1.9|0.7}}

| radius = {{val|143|12}}

| luminosity = {{val|2692|192|180|fmt=commas}}

| gravity = {{val|0.37|0.15}}

| temperature = {{val|3479|125|fmt=commas}}

| metal_fe = −0.15

| rotational_velocity = 11.2

| rotation =

| age_myr = 440

}}

{{Starbox catalog

| names = {{odlist | name=Gorgonea Tertia | B=Rho Per, ρ Per | F=25 Persei | BD=+38°630 | FK5=109 | GC=3682 | HD=19058 | HIP=14354 | HR=921 | PPM=68074 | SAO=56138 }}

}}

{{Starbox reference

|Simbad=rho+Per

}}

Rho Persei, Latinized from ρ Persei, is a star in the northern constellation of Perseus. It has the traditional name Gorgonea Tertia {{IPAc-en|g|ɔːr|g|@|'|n|iː|@|_|'|t|3r|sh|@}}, being the third member of the quartet called the Gorgonea in reference to the Gorgons from the legend of Perseus. An apparent visual magnitude of +3.39 makes it visible to the naked eye, but a challenge to view from a well-lit urban environment. Based upon parallax measurements, it is located at a distance of roughly {{Convert|308|ly|pc}} from Earth.

File:RhoPerLightCurve.png light curve for Rho Persei, plotted from AAVSO data]]

Johann Schmidt discovered that Rho Persei is a variable star, in 1854. Rho Persei is a semiregular variable star, whose apparent magnitude varies between 3.3 and 4.0 with periods of 50, 120 and 250 days. The star has reached the asymptotic giant branch of its evolution. It is a bright giant star with a stellar classification of M4 II. The outer envelope has an effective temperature of 3,479 K, giving it the red-orange hue of an M-type star.

This star has a mass 1.9 times the mass of the Sun, while its radius has expanded to 143 times solar. It is radiating some 2,700 times the Sun's luminosity. Rho Persei is losing mass at the rate of {{val|1.2|e=−8}} solar masses per year, or the equivalent of the Sun's mass every 83 million years. It is about 440 million years in age.

Naming

In Chinese, {{lang|zh|大陵}} ({{lang|zh-Latn|Dà Líng}}), meaning Mausoleum, refers to an asterism consisting of ρ Persei, 9 Persei, τ Persei, ι Persei, κ Persei, β Persei, 16 Persei and 12 Persei. Consequently, the Chinese name for ρ Persei itself is {{lang|zh|大陵六}} ({{lang|zh-Latn|Dà Líng liù}}, {{langx|en|the Sixth Star of Mausoleum}}.).{{in lang|zh}} [http://aeea.nmns.edu.tw/2006/0607/ap060711.html AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 7 月 11 日] {{Webarchive|url=https://web.archive.org/web/20120204114123/http://aeea.nmns.edu.tw/2006/0607/ap060711.html |date=2012-02-04 }}

References

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{{citation | title=rho Per -- Semi-regular pulsating Star | work=SIMBAD | publisher=Centre de Données astronomiques de Strasbourg | url=http://simbad.u-strasbg.fr/simbad/sim-id?Ident=Rho+Persei | access-date=2012-01-24 }}

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{{citation | first1=James B. | last1=Kaler | title=GORGONEA TERTIA (Rho Persei) | work=Stars | publisher=University of Illinois | url=http://stars.astro.illinois.edu/sow/gorgtert.html | access-date=2012-01-25 }}

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}}