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Struve 2398

STF 2398, Gliese 725
HD 173739/173740, LHS 58/59

Binary red dwarf in Draco

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Proper Name	None
Bayer Designation	None
Flamsteed Number	None
HR (BSC)	None
HD	173739 (A), 173740 (B)
Other Designations	STF 2398, Gliese 725; LHS 58 (A), LHS 59 (B)
Constellation	Draco
Right Ascension	18h 42m 47s (A), 18h 42m 47s (B)
Declination	+59° 37' 49" (A), +59° 37' 49" (B)
Distance	11.5 light years 3.5 parsecs
Magnitude	Apparent: +8.89 (A), +9.96 (B) Absolute: +11.16 (A), +12.23 (B)
Spectral Class	M3V red dwarf (A), M3.5V red dwarf (B)
Planets in this system	Struve 2398 B b, super Earth or small gas giant (unconfirmed) Struve 2398 B c, super Earth (unconfirmed)
Optimum Visibility	July (Usually visible from northern latitudes)

The two red dwarfs that together make up the binary system Struve 2398 can be easily distinguished as distinct stars in this image. Struve 2398 A is the slightly brighter northern member of the pair, while its companion Struve 2398 B is the fainter star to the south of the central reticle. Imagery provided by Aladin sky atlas

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