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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | 03h05m 10.59385s[1] |
| Declination | +38° 50′ 24.9943″[1] |
| Apparent magnitude (V) | +3.39[2] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | M4 II[4] |
| U−B color index | +1.79[2] |
| B−V color index | +1.65[2] |
| Variable type | SRb[4] |
| Astrometry | |
| Radial velocity (Rv) | +29.10±0.30[5] km/s |
| Proper motion (μ) | RA: +129.22[1] mas/yr Dec.: –105.70[1] mas/yr |
| Parallax (π) | 10.60 ± 0.25 mas[1] |
| Distance | 308 ± 7 ly (94 ± 2 pc) |
| Absolute magnitude (MV) | −1.7[6] |
| Details[7] | |
| Mass | 1.9±0.7 M☉ |
| Radius | 143±12 R☉ |
| Luminosity | 2,692+192 −180 L☉ |
| Surface gravity (log g) | 0.37±0.15 cgs |
| Temperature | 3,479±125 K |
| Metallicity [Fe/H] | −0.15 dex |
| Rotational velocity (v sin i) | 11.2[8] km/s |
| Age | 440[9] Myr |
| Other designations | |
Gorgonea Tertia, Rho Per, ρ Per, 25 Persei, BD+38°630, FK5 109, GC 3682, HD 19058, HIP 14354, HR 921, SAO 56138, PPM 68074[10] | |
| Database references | |
| SIMBAD | data |
Rho Persei, Latinized from ρ Persei, is a star in the northern constellationofPerseus. It has the traditional name Gorgonea Tertia /ɡɔːrɡəˈniːə ˈtɜːrʃə/,[11] being the third member of the quartet called the Gorgonea in reference to the Gorgons from the legend of Perseus.[9]Anapparent visual magnitude of +3.39[2] 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 308 light-years (94 pc) from Earth.[1]
Rho Persei is a semiregular variable star, whose apparent magnitude varies between 3.3 and 4.0[13] with periods of 50, 120 and 250 days.[6] The star has reached the asymptotic giant branch of its evolution.[3] It is a bright giant star with a stellar classification of M4 II.[4] The outer envelope has an effective temperature of 3,479 K,[7] giving it the red-orange hue of an M-type star.[14]
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.[7] Rho Persei is losing mass at the rate of 1.2×10−8 solar masses per year, or the equivalent of the Sun's mass every 83 million years.[15] It is about 440 million years in age.[9]
InChinese, 大陵 (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 大陵六 (Dà Líng liù, English: the Sixth Star of Mausoleum.).[16]
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