Theta Pictoris (θ Pic) is a star in the Pictor constellation.
Quick Facts Apparent magnitude (V), Characteristics ...
Theta Pictoris
Observation data
Epoch J2000.0 Equinox J2000.0 |
| 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 |
|---|
| Luminosity | 35.4[4] L☉ |
| Other designations |
|---|
|
| θ Pic AB: θ Pic, CD−52°1198, HD 35860, HIP 25303, HR 1818, SAO 233965, WDS J05248-5219AB[8] |
| θ Pic C: CPD−52°717, HD 35859, HIP 25298, HR 1818, SAO 233964, WDS J05248-5219C[9] |
| Database references |
|---|
| θ Pic AB |
|---|
| SIMBAD | data |
|
|---|
| θ Pic C |
|---|
| SIMBAD | data |
Close
The Theta Pictoris system consists of a total of 4 stars.[10] Theta Pictoris C (HD 35859), an A2V star of about 6.77 magnitude,[9] 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.[11] Theta Pictoris AB, in turn, consists of a magnitude 6.76 A0V star[8] and a magnitude 7.40 star separated by 0.287" with an orbital period of 123.2 years and eccentricity of 0.692.[11][12] One of them is also an unresolved spectroscopic binary.[10]