Sigma Ursae Majoris

The Bayer designation Sigma Ursae Majoris (σ UMa, σ Ursae Majoris) is shared by two star systems in the constellation Ursa Major:

Sigma¹ Ursae Majoris (11 Ursae Majoris)
Sigma² Ursae Majoris (13 Ursae Majoris)

They are separated by 0.33° in the sky.

The two stars, Sigma¹ and Sigma² together, are considered an optical double star. They are not a binary star, in that they are not gravitationally linked, but they are close to each other as seen in the sky.

Stars of Ursa Major

Bayer	α (Dubhe) β (Merak) γ (Phecda) δ (Megrez) ε (Alioth) ζ (Mizar) η (Alkaid) θ (Alhaud) ι (Talitha) κ (Talitha Aus) λ (Tania Bor) μ (Tania Aus) ν (Alula Bor) ξ (Alula Aus) ο (Muscida) π¹ π² ρ σ¹ σ² τ υ φ χ ψ ω

Flamsteed	2 5 6 15 16 17 18 19 20 21 22 23 24 26 27 28 31 32 35 36 37 38 39 40 41 42 43 44 46 47 (Chalawan) 49 51 55 56 57 58 59 60 61 62 65 66 67 68 70 71 72 73 74 75 76 78 80 (Alcor) 81 82 83 84 86 55 Cam 56 Cam 57 Cam 1 CVn 14 LMi 15 LMi 25 LMi 47 LMi 37 Lyn 39 Lyn 41 Lyn 44 Lyn

Variable	R T U W Z RV ST SU SW SX TU TX TY UX UY VV VX VY XY ZZ AA AB AE AN AR AW BC BE BM BZ CG CH CO CQ CY DH DI DM DN DV DW EE EG EI EK EN EP ER ET EU EV EZ IY KS NQ NY

HR	3236 3263 3303 3332 3400 3401 3405 3408 3436 3470 3506 3592 3603 3608 3645 3676 3725 3743 (Intercrus) 3747 3824 3838 3854 3855 3859 3885 3911 3918 3922 3929 3939 3954 3958 4044 4046 4051 4052 4067 4096 4098 4103 4108 4132 4165 4176 4181 4191 4215 4242 4243 4264 4275 4278 4280 4283 4285 4286 4336 4340 4345 4351 4367 4383 4388 4391 4407 4412 4421 4424 4435 4439 4452 4457 4474 4481 4482 4486 4493 4500 4521 4536 4545 4562 4569 4574 4581 4584 4593 4610 4672 4767 4840 4859 4867 4917 4936 4953 5070 5076 5085 5126 5148 5169 5077 5213 5216 5256 5280 5302

HD	68988 74389 80461 80606 82408 82969 83564 88609 89221 93551 95572 96127 98618 99706 100018 102956 115043 118203 118970 233604

Gliese	Gliese 338 Gliese 412 Gliese 424 Gliese 450 Gliese 1151

Other	ADS 7251 Feige 34 Feige 48 Feige 55 G 119-62 G 195-19 G 196-3 Groombridge 1618 Groombridge 1830 HAT-P-3 HAT-P-13 HAT-P-21 HAT-P-22 HIP 57050 HIP 57274 HD 80606 and HD 80607 Holmberg IX X-1 Lalande 21185 M82 X-1 M82 X-2 PG 1219+534 PG 1351+489 PSR B1112+50 PSR J1012+5307 Sidus Ludoviciana Winnecke 4 WISE 1405+5534 XTE J1118+480

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