HIP 41378
Star in the constellation Cancer
From Wikipedia, the free encyclopedia
HIP 41378 is a star located 346 light-years away in the constellation of Cancer. The star has an apparent magnitude of 8.92. This F-type main sequence dwarf has a mass of 1.245 M☉[6] and a radius of 1.299 R☉.[7] It has a surface temperature of about 6,371 K.[6]
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 08h 26m 27.84909s[2] |
| Declination | +10° 04′ 49.3342″[2] |
| Apparent magnitude (V) | 8.92[3] |
| Characteristics | |
| Evolutionary stage | Main sequence[2] |
| Spectral type | F8[4] |
| Astrometry | |
| Radial velocity (Rv) | 50.42±0.37[5] km/s |
| Proper motion (μ) | RA: −48.002(20) mas/yr[2] Dec.: 0.062(15) mas/yr[2] |
| Parallax (π) | 9.4360±0.0208 mas[2] |
| Distance | 345.7 ± 0.8 ly (106.0 ± 0.2 pc) |
| Absolute magnitude (MV) | +3.65[1] |
| Details | |
| Mass | 1.245+0.037 −0.043[6] M☉ |
| Radius | 1.299±0.002[7] R☉ |
| Luminosity | 2.44[2] L☉ |
| Surface gravity (log g) | 4.32±0.02[6] cgs |
| Temperature | 6,371±65[6] K |
| Metallicity [Fe/H] | 0.046±0.044[6] dex |
| Rotation | 7.8±1.0 d[7] |
| Rotational velocity (v sin i) | 7.5±0.5[6] km/s |
| Age | 1.8+0.7 −0.6[6] Gyr |
| Other designations | |
| AG+10 1097, BD+10 1799, HIP 41378, SAO 97816, PPM 125260, K2-93, EPIC 211311380, TOI-4304, TIC 366443426, TYC 800-1325-1, YZ 10 3402[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
Planetary system
In 2016, the K2 Kepler mission discovered five planets around HIP 41378, with sizes ranging from 2 times the size of Earth to the size of Jupiter, out to about 1 AU for the outermost planet.[9] The semi-major axes were not known until K2 Haute-Provence Observatory radial velocity data was obtained in 2019. Also, a sixth non-transiting planet, HIP 41378 g, was discovered, along with speculation that additional planets may exist between HIP 41378 g and HIP 41378 d. The planet HIP 41378 f was also found to likely have optically-thick rings or a highly extended atmosphere.[10][11] In 2026, radial velocity evidence for a seventh planet, named HIP 41378 h, with an orbital period of 2,600 days was found. However, it remains uncertain if the variations are caused by a planet or a magnetic cycle.[12]
The stellar rotation of HIP 41378 appears to be misaligned relative to the orbit of HIP 41378 f, and thus likely the other planets' orbits as well.[7]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination (°) |
Radius |
|---|---|---|---|---|---|---|
| b | 6.9±0.5 M🜨 | 0.1300±0.0009 | 15.57209±0.00002 | 0.05+0.03 −0.05 |
88.847±0.048 | 2.640+0.022 −0.024 R🜨 |
| c | 5.97+0.56 −0.86 M🜨 |
0.2088±0.0014 | 31.70591±0.00005 | 0.044+0.022 −0.044 |
88.475±0.013 | 2.740+0.043 −0.049 R🜨 |
| g | 6.81+1.14 −0.98[6] M🜨 |
0.3307±0.0023 | 64.067+0.026 −0.067[6] |
0.055+0.024 −0.054 |
95+1 −10[6] |
— |
| d | 6.53+2.65 −3.15 M🜨 |
0.8885+0.0060 −0.0058 |
278.3618±0.0003 | 0.063+0.027 −0.063 |
89.789±0.005 | 3.650±0.029 R🜨 |
| e | 7.6+3.2 −4.6 M🜨 |
1.1195+0.0094 −0.0110 |
393+3 −5 |
0.065+0.031 −0.065 |
89.801±0.003 | 5.19±0.04 R🜨 |
| f | 25±5 M🜨 | 1.3856+0.0094 −0.0090 |
542.0797±0.0001 | 0.052+0.025 −0.052 |
89.948±0.008 | 9.47±0.07 R🜨 |
| h (unconfirmed) | ≥43+16 −13 M🜨 |
3.94+0.41 −0.51 |
2,602+468 −433 |
0.066+0.033 −0.066 |
— | — |
