| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Orion |
| Right ascension | 05h 11m 46.44941s[1] |
| Declination | +04° 24′ 12.7421″[1] |
| Apparent magnitude (V) | 7.00[2] |
| Characteristics | |
| Spectral type | G0V_CH-0.3[3] |
| B−V color index | 0.588 ± 0.016[2] |
| Astrometry | |
| Radial velocity (Rv) | 5.66±0.13[1] km/s |
| Proper motion (μ) | RA: 181.259(45) mas/yr[1] Dec.: −138.193(29) mas/yr[1] |
| Parallax (π) | 33.7982 ± 0.0529 mas[1] |
| Distance | 96.5 ± 0.2 ly (29.59 ± 0.05 pc) |
| Absolute magnitude (MV) | 4.71[2] |
| Orbit[4] | |
| Companion | HD 33636 B |
| Period (P) | 5.807+0.016 −0.017 yr |
| Semi-major axis (a) | 3.329+0.022 −0.023 AU |
| Eccentricity (e) | 0.483±0.0063 |
| Inclination (i) | 7.07+0.62 −0.54° |
| Longitude of the node (Ω) | 109.9+4.9 −5.0° |
| Periastron epoch (T) | 2455442+12 −13 |
| Argument of periastron (ω) (secondary) | 338.2±1.3° |
| Details | |
| Mass | 1.01 ± 0.02[5] M☉ |
| Radius | 0.97 ± 0.01[5] R☉ |
| Luminosity | 1.08 ± 0.003[5] L☉ |
| Surface gravity (log g) | 4.46 ± 0.02[5] cgs |
| Temperature | 5979 ± 28[5] K |
| Age | 2.5 ± 1.1[5] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 33636 is a G-type main-sequence star located approximately 96.5 light-years away in the Orion constellation. It is a 7th magnitude star with a metallicity of −0.05 ± 0.07. A likely substellar companion was discovered in 2002.[6][7]
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