| Observation data Epoch J2000.0 Equinox J2000.0 |
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|---|---|
| Constellation | Orion |
| Right ascension | 04h 49m 50.4s |
| Declination | +06° 57′ 41″ |
| Apparent magnitude (V) | 3.60 |
| Characteristics | |
| Spectral type | F6V |
| U-B color index | -0.01 |
| B-V color index | 0.45 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | 24.3 km/s |
| Proper motion (μ) | RA: 463.44 mas/yr Dec.: 11.62 mas/yr |
| Parallax (π) | 124.13 ± 0.87 mas |
| Distance | 26.3±0.2 ly (8.06±0.06 pc) |
| Absolute magnitude (MV) | 3.66 |
| Details | |
| Mass | 1.3 M☉ |
| Radius | 1.3 R☉ |
| Luminosity | 3 L☉ |
| Temperature | 6674 K |
| Metallicity | 20-150% |
| Age | 1.7×109 years |
| Other designations | |
|
Tabit, π3 Ori, 1 Ori, BD+06°762, FK5 1134, GCTP 1077.00, Gliese 178, HD 30652, HIP 22449, HR 1543, LTT 11517, SAO 112106
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| Database references | |
| SIMBAD | data |
Pi3 Orionis (π3 Ori / π3 Orionis), formally designated Tabit[1], is a white F-type dwarf star approximately 26 light-years away in the constellation of Orion. It is thought that the star may, in fact, be a binary star system. Though no extrasolar planets have been observed around Pi3 Orionis, the star is considered a prime location for planets as small as the Earth. Pi3 Orionis is the brightest star in the lion's hide (or shield) that Orion is holding.
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Stellar components
Pi3 Orionis is a dwarf star of spectral type F6V. It has been calculated that the star has 1.3 times the mass of the Sun, 1.6 times the radius, and 3 times the luminosity. The star may have anywhere from 20 to 151 percent of the Sun's enrichment in elements heavier than hydrogen (based on its abundance of iron). It is thought that Pi3 Orionis has a companion star, but the purported companion "B" may not in fact be part of the system.
Hunt for substellar objects
Although a periodicity of 73.26 days has been observed in star's radial velocity, it seems likely bound more to stellar activity than to a planetary object in close orbit. No substellar companion has been detected so far around Pi3 Orionis and McDonald Observatory team has set limits to the presence of one or more planets[2] with masses between 0.84 and 46.7 Jupiter masses and average separations spanning between 0.05 and 5.2 astronomical units. Thusly, so far it appears that an Earth-like planet could easily orbit the star without any complications.
See also
References
External links
- "Pi3 Orionis 2?". SolStation. http://www.solstation.com/stars/pi3ori2.htm. Retrieved 2008-07-11.
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