HD 89744
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Ursa Major[1] |
| A | |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 5.73[1] |
| B | |
| Right ascension | Template:RA[3] |
| Declination | Template:DEC[3] |
| Characteristics | |
| Evolutionary stage | Main sequence |
| Spectral type | F7V[4] or F8IV[5] |
| B−V Template:Engvar | Script error: No such module "val".[1] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | Script error: No such module "val".[1] km/s |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[2] Dec.: Script error: No such module "val". mas/yr[2] |
| Parallax (π) | 25.9334±0.0436 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 2.83[6] |
| B | |
| Proper motion (μ) | RA: Script error: No such module "val". mas/yr[3] Dec.: Script error: No such module "val". mas/yr[3] |
| Parallax (π) | 26.0070±0.4713 mas[3] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Details | |
| A | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[8] Template:Solar radius |
| Luminosity | Script error: No such module "val".[9] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[7] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | Script error: No such module "val".[7] dex |
| Rotation | ~9 days[9] |
| Rotational velocity (v sin i) | 9.3[10] km/s |
| Age | 8.4[9] Gyr |
| B | |
| Mass | 0.076[11] Template:Solar mass |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Database references | |
| A | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| B | |
| SIMBAD | data |
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HD 89744 is a star in the northern circumpolar constellation of Ursa Major, positioned about 0.4° due south of the bright star Tania Australis (μ UMa).[12] This object has a yellow-white hue and is dimly visible to the naked eye with an apparent visual magnitude of 5.73.[1] The distance to this star has been measured using the parallax method, which locates it 126 light years from the Sun. It is drifting closer with a radial velocity of −4.4 km/s.[1] There are two known exoplanets orbiting this star.
At various times the star HD 89744 has been assigned a stellar classification of F7V,[4][13] F7IV-V,[14] and F8IV,[5][1] suggesting it is an F-type main-sequence star that is evolving onto the subgiant branch. It is ~8.4[9] billion years old with an inactive chromosphere[14] and is spinning with a projected rotational velocity of 9.3 km/s.[10] The star is 2.16[8] times the size of the Sun with 1.4[7] times the Sun's radius. It is a high metallicity star, showing a greater abundance of heavier elements than in the Sun. The star is radiating 6.4[9] times the luminosity of the Sun from its photosphere at an effective temperature of 6,381 K.[7]
This star was identified as a member of the AB Doradus moving group by J. López-Santiago and collaborators in 2006.[15] It was later shown that its evolutionary state is incompatible with membership.[16]
In 2001, a faint co-moving companion was identified at an angular separation of Script error: No such module "val". from the primary.[17] This is equivalent to a linear projected separation of Script error: No such module "convert"..[11] The companion, designated component B, is an L-class (~L0.5)[4] brown dwarf[17] with a mass of Script error: No such module "val"..[11]
Planetary system
In April 2000, a planet was discovered using radial velocity measurements taken at Fred Lawrence Whipple Observatory and Lick Observatory.[13] The orbital parameters were updated in 2006 and 2007 using additional measurements.[18][19] A second planet with a much longer period was discovered in 2019.[20]
Template:OrbitboxPlanet begin Template:OrbitboxPlanet Template:OrbitboxPlanet hypothetical
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See also
- List of exoplanets discovered before 2000 - HD 89744 b
References
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