Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
A | |
Right ascension | 13h 40m 23.2324s [1] |
Declination | +50° 31′ 09.8962″ [1] |
Apparent magnitude (V) | 6.32 [2] |
B | |
Right ascension | 13h 40m 24.5190s [3] |
Declination | +50° 30′ 57.5709″ [3] |
Apparent magnitude (V) | 10.51 [4] |
Characteristics | |
Spectral type | F8 V [5] + K7 [6] |
U−B color index | −0.01 [2] |
B−V color index | +0.52 [2] |
Astrometry | |
A | |
Radial velocity (Rv) | −12.2±0.3 [7] km/s |
Proper motion (μ) |
RA: −125.728±0.047
[1]
mas/
yr Dec.: 58.567±0.046 [1] mas/ yr |
Parallax (π) | 39.2353 ± 0.0354 mas [1] |
Distance | 83.13 ± 0.08
ly (25.49 ± 0.02 pc) |
Absolute magnitude (MV) | 4.30 [8] |
B | |
Proper motion (μ) |
RA: −131.130±0.044
[3]
mas/
yr Dec.: 59.299±0.049 [3] mas/ yr |
Parallax (π) | 39.3513 ± 0.0326 mas [3] |
Distance | 82.88 ± 0.07
ly (25.41 ± 0.02 pc) |
Details | |
A | |
Mass | 1.15 [9] M☉ |
Radius | 1.1 [10] R☉ |
Luminosity | 1.5 [10] L☉ |
Temperature | 6,149 [11] K |
Metallicity [Fe/H] | −0.18 [11] dex |
Rotational velocity (v sin i) | 10.2 [12] km/s |
Age | 2.06±22 [12] Gyr |
B | |
Mass | 0.63 [9] M☉ |
Temperature | 4,130 [13] K |
Other designations | |
A: BD+51°1859, GJ 521.2, HIP 66704, HR 5148, SAO 28836 [15] | |
B: BD+51°1859 B, HIP 66704 B, HR 5148 B, TYC 3469-1423-1, 2MASS J13402450+5030576 [16] | |
Database references | |
SIMBAD | data |
HD 119124 is a wide binary star [17] system in the circumpolar constellation of Ursa Major. With an apparent visual magnitude of 6.3, [2] it lies below the normal brightness limit of stars that are visible with the naked eye under most viewing conditions. An annual parallax shift of 39.24 [1] mas for the A component provides a distance estimate of 83 light years. The pair are candidate members of the Castor Moving Group, [18] which implies a relatively youthful age of around 200 million years. [12] HD 119124 is moving closer to the Sun with a radial velocity of −12 km/s. [7]
This system was first identified as a double star by Friedrich von Struve (1793−1864) and catalogued as the 1774th entry in his list. As of 2015, the magnitude 10.5 K-type companion star was located at an angular separation of 18.10 arc seconds along a position angle of 135° from the brighter primary. [4] They appear to be gravitationally bound with an estimated orbital period of around 7,000 years and a linear projected separation of 444.6 AU. [17]
The primary, component A, is a Sun-like star [10] with a stellar classification of F8 V, [5] indicating it is an F-type main-sequence star that is generating energy via hydrogen fusion at its core. It is slightly larger and more massive than the Sun [10] [9] and appears mildly variable. [19] The star is radiating 1.5 [10] times the Sun's luminosity from its photosphere at an effective temperature of 6,149 K. [11]
HD 119124 A displays a strong infrared excess at a wavelength of 70 μm, indicating an orbiting circumstellar disk of cold dust. The emission fits a model with a grain temperature of 40 K, indicating a minimum orbital radius of 60 AU from the host star. The estimated grain lifetimes are 84,000 years – much shorter than the star's lifespan. This suggests the grains are being replenished via collisions between some number of larger bodies totaling around 1−6 times the mass of the Moon. [10]
This system is a likely (80.4% chance) source of the strong X-ray emission coming from these coordinates. [20]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
A | |
Right ascension | 13h 40m 23.2324s [1] |
Declination | +50° 31′ 09.8962″ [1] |
Apparent magnitude (V) | 6.32 [2] |
B | |
Right ascension | 13h 40m 24.5190s [3] |
Declination | +50° 30′ 57.5709″ [3] |
Apparent magnitude (V) | 10.51 [4] |
Characteristics | |
Spectral type | F8 V [5] + K7 [6] |
U−B color index | −0.01 [2] |
B−V color index | +0.52 [2] |
Astrometry | |
A | |
Radial velocity (Rv) | −12.2±0.3 [7] km/s |
Proper motion (μ) |
RA: −125.728±0.047
[1]
mas/
yr Dec.: 58.567±0.046 [1] mas/ yr |
Parallax (π) | 39.2353 ± 0.0354 mas [1] |
Distance | 83.13 ± 0.08
ly (25.49 ± 0.02 pc) |
Absolute magnitude (MV) | 4.30 [8] |
B | |
Proper motion (μ) |
RA: −131.130±0.044
[3]
mas/
yr Dec.: 59.299±0.049 [3] mas/ yr |
Parallax (π) | 39.3513 ± 0.0326 mas [3] |
Distance | 82.88 ± 0.07
ly (25.41 ± 0.02 pc) |
Details | |
A | |
Mass | 1.15 [9] M☉ |
Radius | 1.1 [10] R☉ |
Luminosity | 1.5 [10] L☉ |
Temperature | 6,149 [11] K |
Metallicity [Fe/H] | −0.18 [11] dex |
Rotational velocity (v sin i) | 10.2 [12] km/s |
Age | 2.06±22 [12] Gyr |
B | |
Mass | 0.63 [9] M☉ |
Temperature | 4,130 [13] K |
Other designations | |
A: BD+51°1859, GJ 521.2, HIP 66704, HR 5148, SAO 28836 [15] | |
B: BD+51°1859 B, HIP 66704 B, HR 5148 B, TYC 3469-1423-1, 2MASS J13402450+5030576 [16] | |
Database references | |
SIMBAD | data |
HD 119124 is a wide binary star [17] system in the circumpolar constellation of Ursa Major. With an apparent visual magnitude of 6.3, [2] it lies below the normal brightness limit of stars that are visible with the naked eye under most viewing conditions. An annual parallax shift of 39.24 [1] mas for the A component provides a distance estimate of 83 light years. The pair are candidate members of the Castor Moving Group, [18] which implies a relatively youthful age of around 200 million years. [12] HD 119124 is moving closer to the Sun with a radial velocity of −12 km/s. [7]
This system was first identified as a double star by Friedrich von Struve (1793−1864) and catalogued as the 1774th entry in his list. As of 2015, the magnitude 10.5 K-type companion star was located at an angular separation of 18.10 arc seconds along a position angle of 135° from the brighter primary. [4] They appear to be gravitationally bound with an estimated orbital period of around 7,000 years and a linear projected separation of 444.6 AU. [17]
The primary, component A, is a Sun-like star [10] with a stellar classification of F8 V, [5] indicating it is an F-type main-sequence star that is generating energy via hydrogen fusion at its core. It is slightly larger and more massive than the Sun [10] [9] and appears mildly variable. [19] The star is radiating 1.5 [10] times the Sun's luminosity from its photosphere at an effective temperature of 6,149 K. [11]
HD 119124 A displays a strong infrared excess at a wavelength of 70 μm, indicating an orbiting circumstellar disk of cold dust. The emission fits a model with a grain temperature of 40 K, indicating a minimum orbital radius of 60 AU from the host star. The estimated grain lifetimes are 84,000 years – much shorter than the star's lifespan. This suggests the grains are being replenished via collisions between some number of larger bodies totaling around 1−6 times the mass of the Moon. [10]
This system is a likely (80.4% chance) source of the strong X-ray emission coming from these coordinates. [20]