Gliese 710
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Serpens |
| Right ascension | 18h 19m 50.84215s |
| Declination | –01° 56′ 18.9841″ |
| Apparent magnitude (V) | 9.69 (9.65–9.69) |
| Characteristics | |
| Spectral type | K7 Vk |
| U−B color index | +1.23 |
| B−V color index | +1.36 |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | –13.8 km/s |
| Proper motion (μ) |
RA: +1.15 mas/yr Dec.: +1.99 mas/yr |
| Parallax (π) | 51.12 ± 1.63 mas |
| Distance | 64 ± 2 ly (19.6 ± 0.6 pc) |
| Absolute magnitude (MV) | 8.23 (8.19-8.23) |
| Details | |
| Mass | 0.6 M☉ |
| Radius | 0.67 R☉ |
| Luminosity (bolometric) | 0.084 L☉ |
| Luminosity (visual, LV) | 0.044 L☉ |
| Temperature | 4,250 K |
| Rotational velocity (v sin i) | 6.42 ± 0.78 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
| ARICNS | data |
Gliese 710 is a star in the constellation Serpens Cauda which is expected to pass through our Solar System's Oort cloud 1.35 million years from now. Its distance at closest approach is expected to be about 13000 astronomical units, or a mere 77 light days, with an uncertainty of about 50%. For comparison, Proxima Centauri is more than 1500 light days away. "This event will be the strongest disrupting encounter in the future and history of the solar system" according to astronomers Filip Berski and Piotr Dybczyński. At that close distance, it would be similar in brightness to a bright planet, at an apparent visual magnitude of about -2.7 (brighter than Mars), with a total proper motion around one arcminute per year.
Gliese 710 currently is 63.8 light-years (19.6 parsecs) from Earth in the constellation Serpens and has a magnitude of 9.69. It has a stellar classification of K7 Vk, which means it is a main sequence star that is generating energy through the thermonuclear fusion of hydrogen at its core. (The suffix 'k' indicates that the spectrum shows absorption lines from interstellar matter.) The mass of this star is about 60% of the Sun's mass and it has an estimated 67% of the Sun's radius. It is a suspected variable star that may vary in magnitude from 9.65–9.69.
Earlier studies of its proper motion, distance, and radial velocity indicated that its closest approach would be closer to one light year, based on less precise Hipparcos data. The proper motion of Gliese 710 is currently very small for its distance, meaning it is traveling nearly directly in our line of sight.
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