Psi Ursae Majoris
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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.01[2] |
| Characteristics | |
| Evolutionary stage | Giant star |
| Spectral type | K1 III[3] |
| U−B Template:Engvar | +1.12[2] |
| B−V Template:Engvar | +1.14[2] |
| Astrometry | |
| Radial velocity (Rv) | –3.39[4] km/s |
| Proper motion (μ) | RA: –62.02 mas/yr[1] Dec.: –27.78 mas/yr[1] |
| Parallax (π) | 23.2272±0.2513 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc)[1] |
| Absolute magnitude (MV) | −0.27[5] |
| Details[6] | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | 19.12[6]–20.79[7] Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val". cgs |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | Script error: No such module "val". dex |
| Rotational velocity (v sin i) | 5.5[8] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| ψ Ursae Majoris, ψ UMa, Psi UMa, 52 Ursae Majoris, BD+45 1897, FK5 420, GC 15340, HD 96833, HIP 54539, HR 4335, PPM 52277, SAO 43629.[9] | |
| Database references | |
| SIMBAD | data |
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Psi Ursae Majoris (Psi UMa, ψ Ursae Majoris, ψ UMa) is a star in the northern circumpolar constellation of Ursa Major. It has an apparent visual magnitude of +3.01,[2] making it a third magnitude star and one of the brighter members of the constellation. Parallax measurements place it at a distance of Script error: No such module "convert". from Earth.[1] This is sufficiently close that the magnitude of the star is only reduced by 0.05 due to extinction.[4] In Chinese astronomy, Psi Ursae Majoris is called Tien Tsan or Ta Tsun, "Extremely Honorable".[10] The name was possibly derived from the word 太尊, Pinyin: Tàizūn, meaning Royals, because this star stands alone as the only member of the Royals asterism within the Purple Forbidden enclosure (see Chinese constellation).
The spectrum of this star matches a stellar classification of K1 III,[3] with the luminosity class of 'III' indicating this is an evolved giant star that has exhausted the supply of hydrogen at its core. As a consequence, it has expanded to around 20 times the radius of the Sun.[7][6] It is radiating roughly 140 times the luminosity of the Sun from its enlarged outer envelope at an effective temperature of 4,543 K.[6] At this heat, the star glows with the orange hue of a K-type star.[11]
Psi Ursae Majoris is a member of the thin disk population of the Milky Way. It is following an orbit through the galaxy with a low eccentricity of 0.02 that will carry it between Script error: No such module "convert". from the Galactic Center. The low inclination of its orbit means the star will only stray Script error: No such module "convert". from the galactic plane.[12]
References
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- ↑ a b c d Script error: No such module "Citation/CS1". Psi Ursae Majoris' database entry at VizieR.
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