Rho Boötis
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Location of ρ Boötes (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 3.59[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| U−B Template:Engvar | +1.44[2] |
| B−V Template:Engvar | +1.30[2] |
| R−I Template:Engvar | 0.65Script error: No such module "Unsubst". |
| Variable type | RS CVn.[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: –100.531 mas/yr[1] Dec.: +119.870 mas/yr[1] |
| Parallax (π) | 19.8550±0.1587 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.27[3] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val".[7] dex |
| Rotational velocity (v sin i) | 5.0[8] km/s |
| Age | Script error: No such module "val". Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[9] | |
| Database references | |
| SIMBAD | data |
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Rho Boötis is a single,[11] orange-hued star in the northern constellation of Boötes. Its name is a Bayer designation that is Latinised from ρ Boötis, and abbreviated Rho Boo or ρ Boo. This star is visible to the naked eye with an apparent visual magnitude of 3.59.[2] Based upon parallax measurements, it is located at a distance of approximately Script error: No such module "convert". from Earth. It is moving closer to the Sun with a radial velocity of −13.6 km/s.[5] There is an optical companion, a magnitude 11.5 star, located 34.7 arcseconds away along a position angle of 345° (as of 2013).[12]
This is an evolved K-type giant star, currently on the red-giant branch, with a stellar classification of K4 III[3] and an estimated age of 4[6] billion years. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[13] With around 1.23 times the mass of the Sun, it has expanded to 20.6 times the Sun's girth. The star is radiating 129 times the Sun's luminosity from its enlarged photosphere at an effective temperature of about Script error: No such module "val"..[6] Rho Boötis is classified as a RS Canum Venaticorum variable.[4]Script error: No such module "Unsubst". Koen and Eyer examined the Hipparcos data for this star, and found that it varied with a period of 5.214 days, and an amplitude of 0.0027 magnitudes.[14]
Nomenclature
Rho Boötis is known by several different names, including ρ Boo, 25 Boötis, BD+31° 2628, FK5 534, HD 127665, HIP 71053, HR 5429, and SAO 64202.[9] In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Lance, refers to an asterism consisting of ρ Boötis, ε Boötis and σ Boötis.[15] Consequently, the Chinese name for ρ Boötis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[16]
References
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