Gliese 3470
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Cancer[1] |
| Right ascension | 07h 59m 05.8395618539s[2] |
| Declination | 15° 23′ 29.240025256″[2] |
| Apparent magnitude (V) | 12.330[3] |
| Characteristics | |
| Evolutionary stage | Main sequence red dwarf |
| Spectral type | M2.0Ve[2] |
| Apparent magnitude (B) | 13.5[2] |
| Apparent magnitude (V) | 12.330[3] |
| Apparent magnitude (R) | 11.934[2] |
| Apparent magnitude (J) | 8.794[2] |
| Apparent magnitude (H) | 8.206[2] |
| Apparent magnitude (K) | 7.989[2] |
| B−V color index | 1.17 |
| V−R color index | 0.396 |
| J−H color index | 0.588 |
| J−K color index | 0.217 |
| Astrometry | |
| Radial velocity (Rv) | 26.341±0.0038[2] km/s |
| Proper motion (μ) | RA: -185.734[2] mas/yr Dec.: -57.263[2] mas/yr |
| Parallax (π) | 33.9601 ± 0.0582[2] mas |
| Distance | 96.0 ± 0.2 ly (29.45 ± 0.05 pc) |
| Details[3] | |
| Mass | 0.539+0.047 −0.043 M☉ |
| Radius | 0.547±0.018 R☉ |
| Surface gravity (log g) | 4.695±0.046 cgs |
| Temperature | 3600±100 K |
| Metallicity [Fe/H] | 0.20±0.10 dex |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
GJ 3470 is a red dwarf star located in the constellation of Cancer, 30 parsecs away from Earth.[4]
Properties[]
The star has a mass of 0.539 solar masses and a radius of 0.547 solar radii.[3] It is 1.6 billion years old, with a metallicity of 0.2 Fe/H.[5] The star exhibits a strong stellar activity, with three ultraviolet flares detected by 2021.[6]
Planetary system[]
At least one exoplanet has been discovered orbiting at the distance of 0.031 astronomical units.[7] The exoplanet, which is called GJ 3470 b, is a mini-Neptune with an orbital period of 3.3 days.[7]
In July 2020, a group of amateur astronomers reported a new exoplanet candidate, which they hypothesize to be the size of Saturn and inside the system's habitable zone, along with twelve tentative transits from not yet characterized exoplanets in the same star system.[8][9] If confirmed, GJ 3470 c would become the second exoplanet discovered by amateur astronomers, after , an exoplanet discovered by Ural State Technical University using amateur data.[10] The new GJ 3470 candidate was discovered with amateur data and through a project led by amateur astronomers.[8][11][12][13][14][15][16] However, it is important to note that the study in question has not been published in any scientific journal, nor has it been peer reviewed.
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 12.57±1.3 M
|