G 9-38

GJ 1116
	; An ultraviolet band light curve showing several flares on EI Cancri, adapted from Pettersen (1985)
Observation data; Epoch J2000 Equinox J2000
Constellation	Cancer
Right ascension	08h 58m 15.194s
Declination	+19° 45′ 47.08″
Apparent magnitude (V)	13.720
Characteristics
Spectral type	M8Ve+M7V
Astrometry
G 9-38 A
Radial velocity (Rv)	13 ± 5 km/s
Proper motion (μ)	RA: −767.060±0.122 mas/yr ; Dec.: −100.176±0.083 mas/yr
Parallax (π)	194.1443 ± 0.1228 mas
Distance	16.80 ± 0.01 ly ; (5.151 ± 0.003 pc)
G 9-38 B
Proper motion (μ)	RA: −937.133±0.190 mas/yr ; Dec.: −34.559±0.138 mas/yr
Parallax (π)	196.2619 ± 0.1976 mas
Distance	16.62 ± 0.02 ly ; (5.095 ± 0.005 pc)
Orbit
Primary	G 9-38A
Companion	G 9-38B
Period (P)	360 yr
Semi-major axis (a)	33 AU
Details
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, NLTT 20638
	B: Gaia DR2 660597997697274752, LHS 2077, NLTT 20637
Database references
SIMBAD	The system
	A
	B
	G 9-38 Location of G 9-38 in the constellation Cancer;

G 9-38, also known as EI Cancri and GJ 1116, is a binary star system consisting of two M-type stars. At 16.7 light-years from the Sun, the system is relatively nearby. The system has a very high stellar flare activity, with average five flares per hour.

In 2015, the search for third star in the system has yielded inconclusive results.

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