Theta Persei
Template:Location mark Location of θ Persei (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Perseus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.11[2] / 9.987[3] |
| Characteristics | |
| θ Per A | |
| Evolutionary stage | Main sequence |
| Spectral type | F8 V[4] |
| U−B Template:Engvar | +0.00[5] |
| B−V Template:Engvar | +0.49[5] |
| θ Per B | |
| Spectral type | M1.5 V[6] |
| B−V Template:Engvar | +1.48[7] |
| Astrometry | |
| Radial velocity (Rv) | +24.32[8] km/s |
| Proper motion (μ) | RA: +334.66[1] mas/yr Dec.: -89.99[1] mas/yr |
| Parallax (π) | 89.87±0.22 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | 3.88[9] |
| Orbit[10] | |
| Period (P) | 2,720 yr |
| Semi-major axis (a) | 22.289″ |
| Eccentricity (e) | 0.13 |
| Inclination (i) | 75.44° |
| Longitude of the node (Ω) | 128° |
| Periastron epoch (T) | B 1613 |
| Argument of periastron (ω) (secondary) | 100.64° |
| Details | |
| θ Per A | |
| Mass | Script error: No such module "val".[11] Template:Solar mass |
| Radius | Script error: No such module "val".[11] Template:Solar radius |
| Luminosity | Script error: No such module "val".[11] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[12] cgs |
| Temperature | Script error: No such module "val".[12] K |
| Metallicity [Fe/H] | Script error: No such module "val".[12] dex |
| Age | Script error: No such module "val".[11] Gyr |
| θ Per B | |
| Mass | Script error: No such module "val".[3] Template:Solar mass |
| Radius | Script error: No such module "val".[3] Template:Solar radius |
| Temperature | Script error: No such module "val".[3] K |
| Metallicity [Fe/H] | Script error: No such module "val".[12] dex |
| Age | 2.4[3] Gyr |
| Other designations | |
| θ Per, BD+48°746, GJ 107, CCDM J02441+4913, IDS 02374+4848, WDS J02442+4914 | |
| θ Per A: 13 Persei, HR 799, HD 16895, HIP 12777, FK5 93, GC 3277, PPM 45428, SAO 38288 | |
| θ Per B: 2MASS J02441025+4913540 | |
| Database references | |
| SIMBAD | θ Per |
| θ Per A | |
| θ Per B | |
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Theta Persei (Theta Per, θ Persei, θ Per) is a star system 37 light years away from Earth, in the constellation Perseus. It is one of the closest naked-eye stars.
The primary star is a yellowish dwarf (main sequence) star of spectral type F8V, which is somewhat larger and brighter than the Sun, but still within the range considered to have the potential for Earth-like planets. There is also a red dwarf companion of spectral type M1.V, orbiting about 250 AU from the primary. It has a Gaia Data Release 2 parallax of Script error: No such module "val"., corresponding to a distance of Script error: No such module "val"..[13]
An 11th-magnitude star is listed in double-star catalogues as component C of the multiple system. It was Script error: No such module "val". away from component A in 2002,[14] although the separation is rapidly increasing as it is a distant background object with a very different proper motion to the other two stars.[15] An unconfirmed companion, possibly a brown dwarf, was reported Script error: No such module "val". from θ Persei B in 2010.[16]
References
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- ↑ Template:Cite DR2
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External links
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