Astronomy:G 9-38
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Short description: Star in the constellation Cancer
Coordinates: 
08h 58m 15.194s, +19° 45′ 47.08″
 An ultraviolet band light curve showing several flares on EI Cancri, adapted from Pettersen (1985)[1] | |
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[7] mas |
| 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[8] 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[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 | |
| 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, 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]
In 2015, the search for third star in the system has yielded inconclusive results.[13]
References
- ↑ 1.0 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. https://ui.adsabs.harvard.edu/abs/1985A&A...148..151P. Retrieved 11 November 2021.
- ↑ 2.0 2.1 Cutri, Roc M.; Skrutskie, Michael F.; Van Dyk, Schuyler D.; Beichman, Charles A.; Carpenter, John M.; Chester, Thomas; Cambresy, Laurent; Evans, Tracey E. et al. (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. http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=II/246.
- ↑ Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. Bibcode: 2012yCat.1322....0Z.
- ↑ 4.0 4.1 4.2 "G9-38A". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G9-38A.
- ↑ 5.0 5.1 5.2 "G9-38B". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G9-38B.
- ↑ "G9-38". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=G9-38.
- ↑ 7.0 7.1 7.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 8.0 8.1 8.2 Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 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, doi:10.1088/0004-637X/748/2/93, Bibcode: 2012ApJ...748...93R
- ↑ Nearby Star Summary Table
- ↑ Vizier query: Name=G* 1116, Centre de Données astronomiques de Strasbourg , accessed 30 December 2012.
- ↑ Nearby Stars Catalog (NSC) , Planetary Habitability Laboratory, University of Puerto Rico at Arecibo accessed 31 December 2012.
- ↑ 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. et al. (2015), "A 3D Search for Companions to 12 Nearby M-Dwarfs", The Astronomical Journal 149 (3): 106, doi:10.1088/0004-6256/149/3/106, Bibcode: 2015AJ....149..106D
- Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal 784 (2): 156. doi:10.1088/0004-637X/784/2/156. Bibcode: 2014ApJ...784..156D. Table with parallaxes.
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