HD 33636
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Orion |
| Right ascension | 05h 11m 46.448s[1] |
| Declination | +04° 24′ 12.73″[1] |
| Characteristics | |
| Spectral type | G0VH-03 / M6V |
| B−V color index | 0.588 ± 0.016 / ?[2] |
| Astrometry | |
| Proper motion (μ) | RA: 169.0 ± 0.3[3] mas/yr Dec.: -142.3 ± 0.3[3] mas/yr |
| Parallax (π) | 35.6 ± 0.2[3] mas |
| Distance | 91.6 ± 0.5 ly (28.1 ± 0.2 pc) |
| Absolute magnitude (MV) | 4.77 / ? |
| Orbit | |
| Companion | HD 33636 B |
| Period (P) | 5.797 ± 0.002[3] yr |
| Semi-major axis (a) | 14.2 ± 0.2 AU |
| Inclination (i) | 4.1 ± 0.1° |
| Details | |
| Mass | 1.12±0.03[4] / 0.135±0.01 M☉ |
| Radius | 1.01 / 0.2?[5] R☉ |
| Luminosity | 1.07 / 0.002?[5] L☉ |
| Temperature | 5990 ± 50 / ? K |
| Other designations | |
HD 33636 is a binary system located approximately 94 light-years away in Orion constellation. The visible member HD 33636 A is a 7th magnitude yellow main-sequence star. It is located at a distance of 91.6 light years from our home planet. It has Fe/H of −0.05 +/- 0.07.
A companion was discovered in 2002 with a minimum mass of planet size.[2][6] This was ascertained to be a tiny star in 2007, making it HD 33636 B.[3]
HD 33636 B
HD 33636 B was discovered in 2002 by the Keck telescope in Hawaii.[6] It was independently detected at the Haute-Provence Observatory in switzerland.[2] With this method it showed a minimum mass of 9.28 Jupiter masses, and was initially assumed to be a planet and provisionally labelled "HD 33636 b" (lower-case).
In 2007, Bean et al. used the Hubble Space Telescope (HST) and he found that this body has an inclination as little as 4.1 ± 0.1°, which yielded the true mass of 142 Jupiter masses. This is too high to be a planet. It is now classified as an M-dwarf star of spectral type M6V, "HD 33636 B" (upper-case).
This star takes 2117 days or 5.797 years to orbit at the average distance of 3.27 Astronomical Units (AU).
References
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- ↑ 1.0 1.1 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ 3.0 3.1 3.2 3.3 3.4 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ Santos 2003
- ↑ 5.0 5.1 Main Sequence lookup based on 0.135 mass.
- ↑ 6.0 6.1 Lua error in package.lua at line 80: module 'strict' not found.
