Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 09h 31m 31.70873s [1] |
Declination | +63° 03′ 42.7013″ [1] |
Apparent magnitude (V) | +3.65 [2] / +9.0 |
Characteristics | |
Spectral type | F0IV [3] |
B−V color index | 0.360±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −10.4±0.7 [2] km/s |
Proper motion (μ) |
RA: +107.99
[1]
mas/
yr Dec.: + 27.15 [1] mas/ yr |
Parallax (π) | 41.99 ± 0.16 mas [1] |
Distance | 77.7 ± 0.3
ly (23.82 ± 0.09 pc) |
Details | |
23 UMa A | |
Mass | 1.862 [3] M☉ |
Radius | 2.90±0.03 [3] R☉ |
Luminosity | 14.8±0.1 [3] L☉ |
Temperature | 6,651±27 [3] K |
Metallicity [Fe/H] | 0.17 [3] dex |
Age | 1.3 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
23 Ursae Majoris, or 23 UMa, is a binary star system in the constellation Ursa Major, [4] located is approximately 77.7 light years from the Sun. [1] It has the Bayer designation h Ursae Majoris; 23 Ursae Majoris is the Flamsteed designation. The system is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of +3.65. [2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s. [2]
The primary component is a yellow-white F-type subgiant with an apparent magnitude of +3.65. It has 1.9 times the Sun's mass, 2.9 times the Sun's radius and is emitting 15 times the luminosity of the Sun [5] at an effective temperature of 6,651 K. [3] Orbiting at an angular separation of 22.7 arcseconds is the 9th magnitude secondary companion. There is a magnitude +10.5 optical companion at an angular separation of 99.6 arcseconds.
With τ, υ, φ, θ, e and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and Al-Haud, the Pond. [6] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al-Haud was the title for seven stars : f as Alhaud I, τ as Alhaud II, e as Alhaud III, this star (h) as Alhaud IV, θ as Alhaud V, υ as Alhaud VI and φ as Alhaud VII . [7]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Ursa Major |
Right ascension | 09h 31m 31.70873s [1] |
Declination | +63° 03′ 42.7013″ [1] |
Apparent magnitude (V) | +3.65 [2] / +9.0 |
Characteristics | |
Spectral type | F0IV [3] |
B−V color index | 0.360±0.015 [2] |
Astrometry | |
Radial velocity (Rv) | −10.4±0.7 [2] km/s |
Proper motion (μ) |
RA: +107.99
[1]
mas/
yr Dec.: + 27.15 [1] mas/ yr |
Parallax (π) | 41.99 ± 0.16 mas [1] |
Distance | 77.7 ± 0.3
ly (23.82 ± 0.09 pc) |
Details | |
23 UMa A | |
Mass | 1.862 [3] M☉ |
Radius | 2.90±0.03 [3] R☉ |
Luminosity | 14.8±0.1 [3] L☉ |
Temperature | 6,651±27 [3] K |
Metallicity [Fe/H] | 0.17 [3] dex |
Age | 1.3 [3] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
23 Ursae Majoris, or 23 UMa, is a binary star system in the constellation Ursa Major, [4] located is approximately 77.7 light years from the Sun. [1] It has the Bayer designation h Ursae Majoris; 23 Ursae Majoris is the Flamsteed designation. The system is visible to the naked eye as a yellow-white hued star with an apparent visual magnitude of +3.65. [2] It is moving closer to the Earth with a heliocentric radial velocity of −10 km/s. [2]
The primary component is a yellow-white F-type subgiant with an apparent magnitude of +3.65. It has 1.9 times the Sun's mass, 2.9 times the Sun's radius and is emitting 15 times the luminosity of the Sun [5] at an effective temperature of 6,651 K. [3] Orbiting at an angular separation of 22.7 arcseconds is the 9th magnitude secondary companion. There is a magnitude +10.5 optical companion at an angular separation of 99.6 arcseconds.
With τ, υ, φ, θ, e and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and Al-Haud, the Pond. [6] According to the catalogue of stars in the Technical Memorandum 33-507 - A Reduced Star Catalog Containing 537 Named Stars, Al-Haud was the title for seven stars : f as Alhaud I, τ as Alhaud II, e as Alhaud III, this star (h) as Alhaud IV, θ as Alhaud V, υ as Alhaud VI and φ as Alhaud VII . [7]