GJ 3685 - Misplaced Pages

Star in the constellation Leo

GJ 3685
Observation data Epoch J2000 Equinox J2000
Constellation	Leo
Right ascension	11 47 40.74723
Declination	+00° 15′ 20.1018″
Apparent magnitude (V)	13.34
Characteristics
Spectral type	M4V
V−R color index	+1.22
R−I color index	+1.55
Variable type	Flare star
Astrometry

Radial velocity (R_v)	7.02 ± 0.32 km/s
Proper motion (μ)	RA: −314.284 mas/yr Dec.: −100.757 mas/yr
Parallax (π)	53.1361 ± 0.0304 mas
Distance	61.38 ± 0.04 ly (18.82 ± 0.01 pc)

Details

Surface gravity (log g)	4.5 cgs
Temperature	3100 K
Metallicity	0.23
Rotational velocity (v sin i)	5.60 ± 1.40 km/s

Other designations
LP 613-49, LTT 13239, G 10-49, G 11-21
Database references
SIMBAD	data
ARICNS	data

GJ 3685 is a star in the constellation of Leo. It is extremely faint; its apparent magnitude is 13.3, and can only be seen with a ten-inch (25 cm) telescope (see Limiting magnitude). Based on a parallax of 53.1361 milliarcseconds, the system is located 61.4 light-years (18.8 parsecs) away from the Earth.

This is a part of a binary star system consisting of two components separated by 24″. The primary component, GJ 3685 (also known as GJ 3685 A), is a very old red dwarf that is also a flare star. A 20-minute flare was observed in 2004 by the GALEX satellite. Its companion, GJ 3686, is another faint red dwarf with a spectral type of M5. It is also known as LP 613-50 and is also located roughly the same distance as its primary.

References

^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
^ Zacharias, N. (2012). "The fourth US Naval Observatory CCD Astrograph Catalog (UCAC4)". VizieR On-line Data Catalog. 1322. Bibcode:2012yCat.1322....0Z.
^ Newton, Elisabeth R. (2014). "Near-infrared Metallicities, Radial Velocities, and Spectral Types for 447 Nearby M Dwarfs". The Astronomical Journal. 147 (1): 20. arXiv:1310.1087. Bibcode:2014AJ....147...20N. doi:10.1088/0004-6256/147/1/20. S2CID 26818462.
^ "N1 990 A". ARICNS. Centre of Astronomy, Heidelberg University. 5 November 1998. Retrieved 21 March 2017.
^ Deshpande, R.; Blake, C. H.; Bender, C. F.; Mahadevan, S.; Terrien, R. C.; Carlberg, J. K.; Zasowski, G.; Crepp, J.; Rajpurohit, A. S.; Reylé, C.; Nidever, D. L.; Schneider, D. P.; Prieto, C. Allende; Bizyaev, D.; Ebelke, G.; Fleming, S. W.; Frinchaboy, P. M.; Ge, J.; Hearty, F.; Hernández, J.; Malanushenko, E.; Malanushenko, V.; Majewski, S. R.; Marchwinski, R.; Muna, D.; Oravetz, D.; Pan, K.; Schiavon, R. P.; Shetrone, M.; et al. (2013). "The Sdss-Iii Apogee Radial Velocity Survey of M Dwarfs. I. Description of the Survey and Science Goals". The Astronomical Journal. 146 (6): 156. arXiv:1307.8121. Bibcode:2013AJ....146..156D. doi:10.1088/0004-6256/146/6/156. S2CID 118667962.
^ Lépine, Sébastien (2013). "A Spectroscopic Catalog of the Brightest (J < 9) M Dwarfs in the Northern Sky". The Astronomical Journal. 145 (4): 102. arXiv:1206.5991. Bibcode:2013AJ....145..102L. doi:10.1088/0004-6256/145/4/102. S2CID 117144290.
"GJ 3685 A -- Flare Star". SIMBAD Astronomical Database. Centre de données astronomiques de Strasbourg.
"N1 990 B". ARICNS. Centre of Astronomy, Heidelberg University. 5 November 1998. Retrieved 21 March 2017.
Robinson, Richard D.; Wheatley, Jonathan M.; Welsh, Barry Y.; Forster, Karl; Morrissey, Patrick; Seibert, Mark; Rich, R. Michael; Salim, Samir; Barlow, Tom A.; Bianchi, Luciana; Byun, Yong-Ik; Donas, Jose; Friedman, Peter G.; Heckman, Timothy M.; Jelinsky, Patrick N.; Lee, Young-Wook; Madore, Barry F.; Malina, Roger F.; Martin, D. Christopher; Milliard, Bruno; Neff, Susan G.; Schiminovich, David; Siegmund, Oswald H. W.; Small, Todd; Szalay, Alex S.; Wyder, Ted K. (2005). "GALEX Observations of an Energetic Ultraviolet Flare on the dM4e Star GJ 3685A". The Astrophysical Journal. 633 (1): 447–51. arXiv:astro-ph/0507396. Bibcode:2005ApJ...633..447R. doi:10.1086/444608. S2CID 14054351.
Phan-Bao, N.; Bessell, M. S. (2006). "Spectroscopic distances of nearby ultracool dwarfs". Astronomy and Astrophysics. 446 (2): 515–523. arXiv:astro-ph/0509321. Bibcode:2006A&A...446..515P. doi:10.1051/0004-6361:20054064. S2CID 18565840.

Constellation of Leo

Stars

Bayer	α (Regulus) β (Denebola) γ (Algieba) δ (Zosma) ε (Algenubi) ζ (Adhafera) η θ (Chertan) ι κ (Al Minliar al Asad) λ (Alterf) μ (Rasalas) ν ξ ο (Subra) π ρ σ τ υ φ χ ψ ω
Flamsteed	3 6 (h) 7 8 9 10 11 12 13 15 (f) 18 19 20 21 22 (g) 23 26 31 (A) 33 34 35 37 39 40 42 43 44 45 46 48 49 50 51 (m) 52 (k) 53 (l) 54 55 56 57 58 (d) 59 (c) 60 (b) 61 (p) 62 (p) 64 65 (p) 66 67 69 (p) 71 72 73 (n) 75 76 79 80 81 82 83 85 86 87 (e) 88 89 90 92 93 95 (o) 6 LMi 18 LMi 49 LMi 52 LMi
Variable	R AD CN CW DP EE
HR	4253 (p) 4459 (Formosa)
HD	81040 88133 89307 96063 (Dingolay) 97658 99109 (Shama) 100777 (Sagarmatha) 102272
Other	BD+20 2457 Gliese 408 Gliese 436 (Noquisi) GJ 3685 HVS 7 K2-3 K2-18 2MASSI J0937347+293142 2MASS J10475385+2124234 MACS J1149 Lensed Star 1 PSR B0943+10 PSR B0950+08 SDSS J102915+172927

Exoplanets	γ Leonis b μ Leonis b υ Leonis b DP Leonis b Gliese 436 b (Awohali) HD 81040 b HD 88133 b HD 89307 b HD 89345 b HD 96063 b (Ramajay) HD 99109 b (Perwana) HD 100777 b (Laligurans) HD 102272 b c K2-18b c

Galaxies

Messier	65 66 95 96 105
NGC	2903 2906 2911 2964 3041 3048 3049 3177 3185 3187 3190 3193 3226 3227 3239 3274 3301 3357 3362 3367 3370 3377 3384 3412 3426 3447 3455 3489 3501 3506 3521 3524 3535 3593 3596 3598 3599 3602 3605 3607 3608 3628 3632 3640 3646 3647 3664 3666 3678 3686 3697 3705 3710 3758 3799 3800 3801 3805 3806 3810 3816 3821 3837 3840 3841 3842 3844 3845 3851 3857 3859 3860 3861 3862 3864 3867 3868 3873 3875 3883 3884 3886 3900 3902 3908 3925 3937 3947 3954 4005
Numbered	I II III IV V
Other	Cosmic Horseshoe IC 2498 IC 2628 IRAS 10565+2448 J1000+1242 Leo P Leo T PSO J172.3556+18.7734 UGC 6614 UGC 6697