Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 13h 56m 34.18044s [1] |
Declination | +27° 29′ 31.4851″ [1] |
Apparent magnitude (V) | 5.02 [2] |
Characteristics | |
Evolutionary stage | giant |
Spectral type | K3 III [3] |
B−V color index | 1.441±0.005 [2] |
Variable type | suspected irregular [4] |
Astrometry | |
Radial velocity (Rv) | −41.07±0.14 [2] km/s |
Proper motion (μ) |
RA: +28.665
[1]
mas/
yr Dec.: –47.779 [1] mas/ yr |
Parallax (π) | 5.1990 ± 0.1461 mas |
Distance | 630 ± 20
ly (192 ± 5 pc) |
Absolute magnitude (MV) | −1.23 [2] |
Details | |
Radius | 54.74+0.52 −2.22 [1] R☉ |
Luminosity | 716±24 [1] L☉ |
Surface gravity (log g) | 1.85 [5] cgs |
Temperature | 4,197 [6] K |
Metallicity [Fe/H] | −0.27 [5] dex |
Rotational velocity (v sin i) | 1.5 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
9 Boötis is a single, [8] variable star in the northern constellation of Boötes, [7] located around 630 light years away from the Sun. [1] It is visible to the naked eye as a faint, orange-hued star with a baseline apparent visual magnitude of 5.02. [2] This object is moving closer to the Earth with a heliocentric radial velocity of −41 km/s. [2]
This is an aging giant star with a stellar classification of K3 III, [3] 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 55 times the radius of the Sun. [1] It is a suspected irregular variable that ranges in photographic magnitude from 6.1 down to 6.6. [4] [9] 9 Boötis is considered mildly lithium-rich with a moderate level of chromospheric activity. [10] It is radiating 716 [1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,197 K. [6]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Boötes |
Right ascension | 13h 56m 34.18044s [1] |
Declination | +27° 29′ 31.4851″ [1] |
Apparent magnitude (V) | 5.02 [2] |
Characteristics | |
Evolutionary stage | giant |
Spectral type | K3 III [3] |
B−V color index | 1.441±0.005 [2] |
Variable type | suspected irregular [4] |
Astrometry | |
Radial velocity (Rv) | −41.07±0.14 [2] km/s |
Proper motion (μ) |
RA: +28.665
[1]
mas/
yr Dec.: –47.779 [1] mas/ yr |
Parallax (π) | 5.1990 ± 0.1461 mas |
Distance | 630 ± 20
ly (192 ± 5 pc) |
Absolute magnitude (MV) | −1.23 [2] |
Details | |
Radius | 54.74+0.52 −2.22 [1] R☉ |
Luminosity | 716±24 [1] L☉ |
Surface gravity (log g) | 1.85 [5] cgs |
Temperature | 4,197 [6] K |
Metallicity [Fe/H] | −0.27 [5] dex |
Rotational velocity (v sin i) | 1.5 [6] km/s |
Other designations | |
Database references | |
SIMBAD | data |
9 Boötis is a single, [8] variable star in the northern constellation of Boötes, [7] located around 630 light years away from the Sun. [1] It is visible to the naked eye as a faint, orange-hued star with a baseline apparent visual magnitude of 5.02. [2] This object is moving closer to the Earth with a heliocentric radial velocity of −41 km/s. [2]
This is an aging giant star with a stellar classification of K3 III, [3] 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 55 times the radius of the Sun. [1] It is a suspected irregular variable that ranges in photographic magnitude from 6.1 down to 6.6. [4] [9] 9 Boötis is considered mildly lithium-rich with a moderate level of chromospheric activity. [10] It is radiating 716 [1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,197 K. [6]