HD 7924
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Cassiopeia |
| Right ascension | 01h 21m 59.11s[1] |
| Declination | +76° 42′ 37.0″[1] |
| Apparent magnitude (V) | 7.185 |
| Characteristics | |
| Spectral type | K0V |
| Apparent magnitude (B) | 8.005 |
| Apparent magnitude (J) | 5.618 |
| Apparent magnitude (H) | 5.231 |
| Apparent magnitude (K) | 5.159 |
| B−V color index | 0.820 |
| Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | –22.7 km/s |
| Proper motion (μ) | RA: –34.23 ± 0.43[1] mas/yr Dec.: –33.28 ± 0.48[1] mas/yr |
| Parallax (π) | 59.49 ± 0.46[1] mas |
| Distance | 54.8 ± 0.4 ly (16.8 ± 0.1 pc) |
| Absolute magnitude (MV) | 6.056 |
| Details | |
| Mass | 0.832+0.022 −0.036 M☉ |
| Radius | 0.78 ± 0.02 R☉ |
| Luminosity | 0.389 L☉ |
| Surface gravity (log g) | 4.47 cgs |
| Temperature | 5177 ± 44 K |
| Metallicity | -0.15 ± 0.03 |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
| ARICNS | data |
| Extrasolar Planets Encyclopaedia |
data |
HD 7924 is a 7th magnitude K-type main sequence star located approximately 55 light years away in the constellation Cassiopeia. This star is smaller, cooler, dimmer, and less massive than our Sun. Also its metal content is about seven-tenths as much as the Sun. In 2009, a super-Earth exoplanet was found in orbit around the star.[2] In 2015, two more planets were discovered, and the mass of the original planet was revised downwards slightly.[3][4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥8.68 ± 0.52 M⊕ | 0.05664 ± 0.00068 | 5.39792 ± 0.00025 | 0.058 +0.056 −0.040 |
— | — |
| c | ≥7.86 ± 0.72 M⊕ | 0.1134 ± 0.0014 | 15.299 ± 0.0033 | 0.098 +0.096 −0.069 |
— | — |
| d | ≥6.44 ± 0.79 M⊕ | 0.1551 ± 0.0019 | 24.451 ± 0.016 | 0.21 +0.13 −0.12 |
— | —
|
See also
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Lua error in package.lua at line 80: module 'strict' not found. Vizier catalog entry
- ↑ 2.0 2.1 Lua error in package.lua at line 80: module 'strict' not found.
- ↑ http://newscenter.berkeley.edu/2015/04/28/robotic-telescope-discovers-three-super-earth-planetary-neighbors/
- ↑ 4.0 4.1 http://arxiv.org/abs/1504.06629
Coordinates: 
01h 21m 59.1153s, +76° 42′ 37.024″
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