23 Ursae Majoris
Template:Location mark Location of 23 Ursae Majoris (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +3.65[2] / +9.0 |
| Characteristics | |
| Spectral type | F0IV[3] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[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 | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| 23 UMa A | |
| Mass | 1.862[3] Template:Solar mass |
| Radius | Script error: No such module "val".[3] Template:Solar radius |
| Luminosity | Script error: No such module "val".[3] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[3] K |
| Metallicity [Fe/H] | 0.17[3] dex |
| Age | 1.3[3] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[4] | |
| Database references | |
| SIMBAD | data |
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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.
Nomenclature
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]
References
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- ↑ a b c d e f Script error: No such module "citation/CS1".
- ↑ a b c d e Script error: No such module "citation/CS1".
- ↑ a b c d e f g h Script error: No such module "citation/CS1". See Table 3.
- ↑ a b Template:Cite simbad
- ↑ Script error: No such module "citation/CS1".. See Table 10.
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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