9 Boötis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes[1] |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.02[1] |
| Characteristics | |
| Evolutionary stage | AGB[3] |
| Spectral type | K3 III[4] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Variable type | suspected irregular[5] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: +28.154[2] mas/yr Dec.: −48.279[2] mas/yr |
| Parallax (π) | 5.2113±0.1011 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.23[1] |
| Details | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Radius | 44[2] Template:Solar radius |
| Luminosity | 857[2] Template:Solar luminosity |
| Surface gravity (log g) | 1.85[6] cgs |
| Temperature | 4,197[7] K |
| Metallicity [Fe/H] | −0.27[6] dex |
| Rotational velocity (v sin i) | 1.5[7] km/s |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[8] | |
| Database references | |
| SIMBAD | data |
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9 Boötis is a single,[9] variable star in the northern constellation of Boötes,[8] located around 630 light years away from the Sun. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 5.0. This object is moving closer to the Earth with a heliocentric radial velocity of −41 km/s.[1]
This is an aging giant star with a stellar classification of K3 III,[4] which indicates it has exhausted the hydrogen at its core and evolved of the main sequence. As a consequence, its outer atmosphere has swollen to 44 times the radius of the Sun.[2] It is a suspected irregular variable that ranges in photographic magnitude from 6.1 down to 6.6.[5][10] 9 Boötis is considered mildly lithium-rich with a moderate level of chromospheric activity.[11] It is radiating 857 times the luminosity of the Sun[2] from its enlarged photosphere at an effective temperature of 4,197 K.[7]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d e f g h i Template:Cite Gaia DR3
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- ↑ a b c Script error: No such module "citation/CS1".
- ↑ a b Template:Cite simbad
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- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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