HIP 70849
HIP 70849 is a 10th magnitude K-type main sequence star located approximately 78 light years away in the constellation Lupus. This star, which resembles a brighter red dwarf, is smaller, cooler, dimmer, and less massive than our Sun. In 2009, a gas giant planet/brown dwarf was found in orbit around it.
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 29m 18.563s[1] |
| Declination | −46° 27′ 49.74″[1] |
| Apparent magnitude (V) | 10.4 |
| Characteristics | |
| Spectral type | K7V |
| Apparent magnitude (B) | 11.6 |
| Apparent magnitude (J) | 7.639 |
| Apparent magnitude (H) | 7.006 |
| Apparent magnitude (K) | 6.790 |
| B−V color index | 1.2 |
| Astrometry | |
| Proper motion (μ) | RA: −47.12 ± 2.15[1] mas/yr Dec.: −203.52 ± 1.93[1] mas/yr |
| Parallax (π) | 42.42 ± 2.09[1] mas |
| Distance | 77 ± 4 ly (24 ± 1 pc) |
| Absolute magnitude (MV) | 8.5 |
| Details | |
| Mass | 0.62 M☉ |
| Radius | 0.67 ± 0.04 R☉ |
| Luminosity | 0.097 ± 0.012 L☉ |
| Surface gravity (log g) | 4.34 cgs |
| Temperature | 3950 ± 100 K |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| Extrasolar Planets Encyclopaedia | data |
There is also a potential T4.5 brown dwarf companion orbiting ~9000AU from HIP 70849.[2]
Planetary system
HIP 70849 b is an extrasolar planet orbiting the star. It has more than five times the mass of Jupiter and takes more than 3000 days to orbit at a semimajor axis of more than 3.5 AU.[3]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | >5 MJ | >3.5 | >3000 | ? | — | — |
See also
- List of extrasolar planets
References
- van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.Vizier catalog entry
- Lodieu, N.; et al. (2014). "Binary frequency of planet-host stars at wide separations. A new brown dwarf companion to a planet-host star". Astronomy and Astrophysics. 569. A120. arXiv:1408.1208. Bibcode:2014A&A...569A.120L. doi:10.1051/0004-6361/201424210.
- Ségransan, D.; et al. (2011). "The HARPS search for southern extra-solar planets. XXIX. Four new planets in orbit around the moderately active dwarfs HD 63765, HD 104067, HD 125595, and HIP 70849". Astronomy and Astrophysics. 535. A54. arXiv:1107.0339. Bibcode:2011A&A...535A..54S. doi:10.1051/0004-6361/200913580.
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