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

Star 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.^[11] At 16.7 light-years from the Sun, the system is relatively nearby.^[12] The system has a very high stellar flare activity, with average five flares per hour.^[1]

Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...

In 2015, the search for third star in the system has yielded inconclusive results.^[13]

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This article uses material from the Wikipedia article G_9-38, and is written by contributors. Text is available under a CC BY-SA 4.0 International License; additional terms may apply. Images, videos and audio are available under their respective licenses.

[Pettersen-1] [1]
Pettersen, B. R. (July 1985). "Discovery of flare activity on the low luminosity red dwarf system G9-38 AB". Astronomy & Astrophysics. 148: 151–154. Bibcode:1985A&A...148..151P. Retrieved 11 November 2021.

[2MASS-2] [2]
Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E.; Fowler, John W.; Gizis, John E.; Howard, Elizabeth V.; Huchra, John P.; Jarrett, Thomas H.; Kopan, Eugene L.; Kirkpatrick, J. Davy; Light, Robert M.; Marsh, Kenneth A.; McCallon, Howard L.; Schneider, Stephen E.; Stiening, Rae; Sykes, Matthew J.; Weinberg, Martin D.; Wheaton, William A.; Wheelock, Sherry L.; Zacarias, N. (2003). "VizieR Online Data Catalog: 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)". CDS/ADC Collection of Electronic Catalogues. 2246: II/246. Bibcode:2003yCat.2246....0C.

[UCAC4-3] [3]
Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode:2012yCat.1322....0Z.

[Simbad2-4] [4]
"G9-38A". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.

[Simbad3-5] [5]
"G9-38B". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.

[SIMBAD-6] [6]
"G9-38". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 September 2020.

[GaiaEDR3a-7] [7]
Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[GaiaEDR3b-8] [8]
Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.

[9] [9]
Rojas-Ayala, Bárbara; Covey, Kevin R.; Muirhead, Philip S.; Lloyd, James P. (2011), "Metallicity and Temperature Indicators in M dwarf K band Spectra: Testing New & Updated Calibrations With Observations of 133 Solar Neighborhood M dwarfs", The Astrophysical Journal, 748 (2): 93, arXiv:1112.4567, Bibcode:2012ApJ...748...93R, doi:10.1088/0004-637X/748/2/93, S2CID 41902340

[10] [10]
Nearby Star Summary Table

[11] [11]
Vizier query: Name=G* 1116, Centre de Données astronomiques de Strasbourg, accessed 30 December 2012.

[12] [12]
Nearby Stars Catalog (NSC) Archived 2021-02-27 at the Wayback Machine, Planetary Habitability Laboratory, University of Puerto Rico at Arecibo accessed 31 December 2012.

[13] [13]
Davison, Cassy L.; White, R. J.; Henry, T. J.; Riedel, A. R.; Jao, W-C.; Bailey Iii, J. I.; Quinn, S. N.; Cantrell, J. R.; Subasavage, J. P.; Winters, J. G. (2015), "A 3D Search for Companions to 12 Nearby M-Dwarfs", The Astronomical Journal, 149 (3): 106, arXiv:1501.05012, Bibcode:2015AJ....149..106D, doi:10.1088/0004-6256/149/3/106, S2CID 9719725

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[2]

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Observation data Epoch J2000 Equinox J2000
An ultraviolet band light curve showing several flares on EI Cancri, adapted from Pettersen (1985)^[1]
Constellation	Cancer
Right ascension	08^h 58^m 15.194^s^[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 (R_v)	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)	360 yr
Semi-major axis (a)	33 AU
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 constellation Cancer

G_9-38

References

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