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Sigma Coronae Borealis

17 Coronae Borealis, Gliese 915.2, Gliese 9550
TZ Coronae Borealis (A component),
Gliese 9549 (C component)

Multiple star in Coronae Borealis

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Proper Name	None
Bayer Designation	Sigma Coronae Borealis Sigma² Coronae Borealis (A), Sigma¹ Coronae Borealis (B)
Flamsteed Number	17 Coronae Borealis
HR (BSC)	6063 (A), 6064 (B)
HD	146361 (A), 146362 (B)
Variable Designation	TZ Coronae Borealis (A component)
Other Designations	Gliese 915.2, Gliese 9550, Gliese 9549 (C component)
Constellation	Corona Borealis
Right Ascension	16h 14m 41s (A) 16h 14m 40s (B) 16h 13m 56s (C)
Declination	+33° 51' 31" (A) +33° 51' 27" (B) +33° 46' 24" (B)
Distance	74 light years 23 parsecs
Magnitude	Apparent: +5.53 (A), +6.51 (B), +14.31 (C) Absolute: +3.75 (A), +4.73 (B), +12.54 (C)
Spectral Class	F6V bright yellow dwarf (A) G1V yellow dwarf (B) M2.5V red dwarf (C)
Optimum Visibility	June

The star centred in this image is actually a system with three components: a close binary designated 'A' and a third star in a wider orbit designated 'B'. Sigma Coronae Borealis C is also a binary, much more widely separated from the triple system, and is visible among the fainter stars to the southwest (lower right) of this image. It follows a distant orbit around the AB system that takes nearly nine hundred thousand years to complete. Imagery provided by Aladin sky atlas

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Corona Borealis

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