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Pi3 Orionis
Orion constellation map.png
The location of Pi3 Orionis (π3) in the constellation of Orion.
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Orion
Right ascension 04h 49m 50.4s
Declination +06° 57′ 41″
Apparent magnitude (V) 3.60
Spectral type F6V
U-B color index -0.01
B-V color index 0.45
Variable type Suspected
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
Mass 1.3 M
Radius 1.3 R
Luminosity 3 L
Temperature 6674 K
Metallicity 20-150%
Age 1.7×109 years
Other designations
Database references

Pi3 Orionis3 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.


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


External links



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