Gliese 625
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Draco |
| Right ascension | 16h 25m 24.62304s[1] |
| Declination | +54° 18′ 14.7655″[1] |
| Apparent magnitude (V) | 10.13[2] |
| Characteristics | |
| Spectral type | M1.5V[3] |
| B−V color index | 1.591±0.027[2] |
| Absolute magnitude (MV) | 11.06[2] |
| Details | |
Rotational velocity (v sin i) | 2.2±0.7[7] km/s |
| Database references | |
| SIMBAD | data |
GJ 625 (AC 54 1646-56) is a small
This is an
magnetic activity level.[6] The star has about a quarter of the mass and size of the Sun,[4] and the metal content is 40% the abundances in the Sun's atmosphere. It is radiating just 1.5% of the luminosity of the Sun from its photosphere at an effective temperature of 3,557 K.[7]
Planetary system
On May 18, 2017, a planet was detected orbiting GJ 625 by the
circumstellar habitable zone of its star, and the discoverers speculate it may support liquid water, depending on atmospheric conditions.[6] Based on the habitable zone model of Kopparapu et al. 2013, the planet is not considered to be in the habitable zone as it would likely experience a runaway greenhouse effect, similar to Venus.[9][10][11][12]
Since the star is considered quiescent (having a low X-ray emission and flare rate), the radio emission from the system may be auroral in nature and coming from a short-period planet. Further observations will be needed to confirm this.[13]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥2.82±0.51 M🜨 | 0.078361+0.000044 −0.000046 |
14.628+0.012 −0.013 |
0.13+0.12 −0.09 |
— | — |
References
- ^ S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ S2CID 119257644.
- ^ S2CID 53135130. A128.
- ^ .
- S2CID 102351979. A68. VizieR entry
- ^ S2CID 119003137.
- ^ .
- ^ "G 202-48". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-11-21.
- S2CID 76651902.
- ^ Kopparapu, Ravi Kumar. "Calculation of Habitable Zones". Retrieved 20 November 2023.
- ^ "GJ 625". hzgallery.org. Retrieved 15 September 2022.
- ^ LePage, Andrew (22 May 2017). "Habitable Planet Reality Check: Is GJ 625b a Super-Earth or a Super-Venus?". drewexmachina.com. Retrieved 15 September 2022.
- S2CID 238583021. L10.
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