HIP 70849
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lupus |
| Right ascension | 14h 29m 18.56436s |
| Declination | −46° 27′ 49.7378″ |
| Apparent magnitude (V) | 10.36 |
| Characteristics | |
| Spectral type | K7Vk |
| Apparent magnitude (B) | 11.787 |
| Apparent magnitude (J) | 7.639±0.023 |
| Apparent magnitude (H) | 7.006±0.061 |
| Apparent magnitude (K) | 6.790±0.027 |
| B−V color index | 1.427±0.019 |
| Variable type | 8.50 |
| Astrometry | |
| Radial velocity (Rv) | −0.134±0.0013 km/s |
| Proper motion (μ) | RA: −44.051±0.017 mas/yr Dec.: −201.577±0.020 mas/yr |
| Parallax (π) | 41.4618±0.0175 mas |
| Distance | 78.66 ± 0.03 ly (24.12 ± 0.01 pc) |
| Absolute magnitude (MV) | 8.5 |
| Details | |
| Mass | 0.63±0.03 0.76±0.07 M☉ |
| Radius | 0.62±0.02 R☉ |
| Luminosity (bolometric) | 0.0892±0.0005 L☉ |
| Surface gravity (log g) | 3.70±0.09 cgs |
| Temperature | 4,103±25 K |
| Metallicity [Fe/H] | 0.00±0.03 dex |
| Rotation | 41.2 d |
| Rotational velocity (v sin i) | 1.93 km/s 0.30±0.30 km/s |
| Age | 3.6±0.15 Gyr |
| Other designations | |
| NSV 6678, CD−45°9206, GJ 550.3, HIP 70849, PPM 760399, LTT 5717, NLTT 37446 | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HIP 70849 is a star with two non-stellar companions in the southern constellation Lupus. It is a 10th magnitude star, making it too faint to be visible to the naked eye. The system is located at a distance of 78.7 light-years from the Sun based on parallax measurements.
This is a K-type main-sequence star with a stellar classification of K7Vk, where the 'k' indicates interstellar absorption features in the spectrum. The star is magnetically active with a 10.1±1.4 yr starspot cycle. It appears about 3.6 billion years old and the light emission shows a 41.2 day periodicity, which is likely the rotation period. This star, which resembles a brighter red dwarf, is smaller and less massive than the Sun. It is radiating just 9% of the luminosity of the Sun from its photosphere at an effective temperature of 4,103 K.
In 2009, a gas giant planet was found in orbit around it. Designated HIP 70849 b, it has 4.5 times the mass of Jupiter and takes more than 3000 days to orbit at a semimajor axis of 3.99 AU, with a high eccentricity. There is also a T4.5 brown dwarf companion orbiting ~9000AU from HIP 70849.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 4.5+0.4 −0.3 MJ |
3.99+0.06 −0.07 |
3649±18 | 0.65+0.02 −0.01 |
96±16° | — |