Theta Persei
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| Observation data Epoch J2000 |
|
|---|---|
| Constellation (pronunciation) |
Perseus |
| Right ascension | 02h 44m 11.99s |
| Declination | +49° 13' 42.4" |
| Apparent magnitude (V) | 4.12/10 |
| Characteristics | |
| Spectral type | F7V/M1V |
| U-B color index | 0/0.99 |
| B-V color index | 0.49/1.48 |
| Astrometry | |
| Radial velocity (Rv) | +25.0 km/s |
| Proper motion (μ) | RA: 334.02 mas/yr Dec.: -89.96 mas/yr |
| Parallax (π) | 89.03 ± 0.79 mas |
| Distance | 36.6 ± 0.3 ly (11.23 ± 0.1 pc) |
| Absolute magnitude (MV) | 3.89/9.8 |
| Visual binary orbit | |
| Companion | Theta Persei B |
| Period (P) | 2720 yr |
| Semimajor axis (a) | 22.29" |
| Eccentricity (e) | 0.13 |
| Inclination (i) | 75.44° |
| Longitude of the node (Ω) | 128° |
| Periastron epoch (T) | ? |
| Details | |
| Mass | 1.14/? M☉ |
| Radius | ?/? R☉ |
| Luminosity | 2.82/? L☉ |
| Temperature | ?/? K |
| Metallicity | ? |
| Rotation | ? |
| Age | ? years |
| Other designations | |
Theta Persei (θ Per) is a star system 37 light years away from Earth, in the constellation Perseus. The primary star is a yellowish dwarf (main sequence) star of spectral type F7V, which is somewhat larger and brighter than our 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 M1V, orbiting about 250 AU from the primary.
[edit] External links
- Simbad Query Result. Simbad. Retrieved on March 28, 2007.
- Draft of SIM target stars. JPL. Retrieved on March 28, 2007.
- theta Persei. Alcyone software. Retrieved on March 28, 2007.
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