Theta Pictoris
Star in the constellation Pictor
From Wikipedia, the free encyclopedia
Theta Pictoris (θ Pic) is a star in the Pictor constellation.
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Pictor |
| θ Pic AB | |
| Right ascension | 05h 24m 46.28819s[1] |
| Declination | −52° 18′ 58.4836″[1] |
| Apparent magnitude (V) | 6.26[2] |
| θ Pic C | |
| Right ascension | 05h 24m 42.32511s[3] |
| Declination | −52° 18′ 46.9457″[3] |
| Apparent magnitude (V) | 6.79[4] |
| Characteristics | |
| θ Pic AB | |
| Spectral type | A0V[5] (A1III + Am)[6] |
| B−V color index | 0.067±0.004[2] |
| θ Pic C | |
| Spectral type | A2V[6] |
| Astrometry | |
| θ Pic AB | |
| Radial velocity (Rv) | −3.1±0.8[7] km/s |
| Proper motion (μ) | RA: −4.00[1] mas/yr Dec.: −27.71[1] mas/yr |
| Parallax (π) | 6.36±0.32 mas[1] |
| Distance | 510 ± 30 ly (157 ± 8 pc) |
| Absolute magnitude (MV) | +0.28[2] |
| θ Pic C | |
| Radial velocity (Rv) | −8.20±3.7[7] km/s |
| Proper motion (μ) | RA: −5.411[3] mas/yr Dec.: −27.743[3] mas/yr |
| Parallax (π) | 6.3027±0.0322 mas[3] |
| Distance | 517 ± 3 ly (158.7 ± 0.8 pc) |
| Absolute magnitude (MV) | +0.99[4] |
| Details | |
| θ Pic AB | |
| Luminosity | 68.0[2] L☉ |
| θ Pic C | |
| Mass | 2.647+0.129 −0.130[8] M☉ |
| Radius | 2.69+0.99 −0.20[8] R☉ |
| Luminosity | 69.6+9.0 −8.0[8] L☉ |
| Surface gravity (log g) | 3.96+0.18 −0.09[8] cgs |
| Temperature | 10,085+790 −202[8] K |
| Metallicity [Fe/H] | -0.18±0.08[8] dex |
| Age | 340+70 −40[8] Myr |
| Other designations | |
| θ Pic AB: θ Pic, CD−52°1198, HD 35860, HIP 25303, HR 1818, SAO 233965, WDS J05248-5219AB[9] | |
| θ Pic C: CPD−52°717, HD 35859, HIP 25298, HR 1818, SAO 233964, WDS J05248-5219C[10] | |
| Database references | |
| θ Pic AB | |
| SIMBAD | data |
| θ Pic C | |
| SIMBAD | data |
The Theta Pictoris system consists of a total of 4 stars.[11] Theta Pictoris C (HD 35859), an A2V star of about 6.77 magnitude,[10] can be distinguished visually with a small telescope from the main system Theta Pictoris AB; its angular separation from AB is 38.3 arc seconds.[12] Theta Pictoris AB, in turn, consists of a magnitude 6.76 A0V star[9] and a magnitude 7.40 star separated by 0.287" with an orbital period of 123.2 years and eccentricity of 0.692.[12][13] One of them is also an unresolved spectroscopic binary.[11]
