HIP 57274
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ursa Major |
| Right ascension | 11h 44m 40.9643s[1] |
| Declination | +30° 57′ 33.4509″[1] |
| Apparent magnitude (V) | 8.96[2] |
| Characteristics | |
| Spectral type | K5 V[2] |
| U−B color index | +1.06[3] |
| B−V color index | +1.111±0.016[4] |
| Absolute magnitude (MV) | 6.89[2] |
| Details Gyr | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
HIP 57274 is a
light years based on stellar parallax, and it is drifting further away with a radial velocity of +30 km/s.[1] The star has a relatively high rate of proper motion, traversing the celestial sphere at the rate of 0.382 arcsecond/year.[6]
This is an ordinary
luminosity of the Sun from its photosphere at an effective temperature
of 4,640 K.
Planetary system
The three exoplanets orbiting HIP 57274 were discovered by the
planetary transits was unsuccessful.[7] The planetary orbits are possibly highly variable, being strongly affected by mean motion resonances.[8] The most stable region for a hypothetical super-earth within the star's habitable zone would be an orbit inside 0.37–0.56 AU from the host star.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥11.6±1.3 M🜨 | 0.0713±0.00163 | 8.1352±0.004 | 0.187±0.10 | — | — |
| c | ≥0.41±0.01 MJ | 0.1778±0.0041 | 32.03±0.02 | 0.05±0.02 | — | — |
| d | ≥0.53±0.03 MJ | 1.007±0.027 | 431.7±8.5 | 0.27±0.05 | — | — |
References
- ^ .
- ^ .
- Bibcode:1986EgUBV........0M.
- S2CID 119257644.
- ^ "BD+31 2290". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 28 August 2017.
- S2CID 2603568.
- S2CID 37557541. 103.
- ^
