| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 58m 15.194s[2] |
| Declination | +19° 45′ 47.08″[2] |
| Apparent magnitude (V) | 13.720[3] |
| Characteristics | |
| Spectral type | M8Ve+M7V[4][5] |
| Astrometry | |
| G 9-38 A | |
| Radial velocity (Rv) | 13 ± 5[6] km/s |
| Proper motion (μ) | RA: −767.060±0.122[7]mas/yr Dec.: −100.176±0.083[7]mas/yr |
| Parallax (π) | 194.1443±0.1228 mas[7] |
| Distance | 16.80 ± 0.01 ly (5.151 ± 0.003 pc) |
| G 9-38 B | |
| Proper motion (μ) | RA: −937.133±0.190[8] mas/yr Dec.: −34.559±0.138[8] mas/yr |
| Parallax (π) | 196.2619 ± 0.1976 mas[8] |
| Distance | 16.62 ± 0.02 ly (5.095 ± 0.005 pc) |
| Orbit | |
| Primary | G 9-38A |
| Companion | G 9-38B |
| Period (P) | 360yr |
| Semi-major axis (a) | 33AU |
| Details[9][10] | |
| G 9-38A | |
| Mass | 0.12 M☉ |
| Luminosity (bolometric) | 0.000965 L☉ |
| Temperature | 2896±18 K |
| Metallicity [Fe/H] | -0.12(unreliable) dex |
| G 9-38B | |
| Mass | 0.10 M☉ |
| Luminosity (bolometric) | 0.000992 L☉ |
| Other designations | |
| EI Cnc,GJ 1116,WDS J08582+1945AB,G 9-38,G 47-14,G 41-11,LP 426-40,LTT 12343,PLX 2144.03,GSC 01397-01138,2MASS J08581519+1945470 | |
| A:Gaia DR2 660597997696173440,LHS 2076[4],NLTT 20638[4] | |
| B:Gaia DR2 660597997697274752,LHS 2077[5],NLTT 20637[5] | |
| Database references | |
| SIMBAD | The system |
| A | |
| B | |
  G 9-38 Location of G 9-38 in the constellationCancer | |
G 9-38, also known asEI Cancri andGJ 1116, is abinary star system consisting of twoM-type stars.[11] At 16.7light-years from theSun, the system is relativelynearby.[12]
In 1985, Bjørn Ragnvald Pettersen announced his discovery that the star shows very highstellar flare activity, with an average of five flares per hour.[1] It was given itsvariable star designation, EI Cancri, in 1987.[13]
In 2015, the search for third star in the system has yielded inconclusive results.[14]
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