Upsilon Ursae Majoris

Upsilon Ursae Majoris
Observation data Epoch J2000.0 Equinox J2000.0
Location of υ Ursae Majoris (circled)
Constellation	Ursa Major
Right ascension	09^h 50^m 59.4^s
Declination	+59° 02′ 19″
Apparent magnitude (V)	+3.78
Characteristics
Spectral type	F2 IV^[1]
Astrometry

Distance	115 ± 3 ly (35 ± 1 pc)

Other designations
υ Ursae Majoris, υ UMa, Upsilon UMa, 29 Ursae Majoris, BD+59 1268, CCDM J09510+5902A, FK5368, GC 13540, HD 84999, HIP 48319, HR 3888, IDS 09439+5931, PPM 32349, SAO 27401, WDS J09510+5902A.
Database references
SIMBAD	data

Upsilon Ursae Majoris (Upsilon UMa, υ Ursae Majoris, υ UMa) is a binary star in the constellation Ursa Major. It is approximately 115 light years from Earth.

The primary component, Upsilon Ursae Majoris A, is a yellow-white F-type subgiant with a mean apparent magnitude of +3.78. It is classified as a Delta Scuti type^[1] variable star and its brightness varies from magnitude +3.68 to +3.86 with a period of 3.18 hours. It has a projected rotational velocity of 110 km s⁻¹, an effective temperature of 7,080 K, and a luminosity 29–30 times that of the Sun.^[1]

The companion, Upsilon Ursae Majoris B, is a magnitude +11.5 star, 11.3 arcseconds away from the primary.

Naming

With τ, h, φ, θ, e, and f, it composed the Arabic asterism Sarīr Banāt al-Na'sh, the Throne of the daughters of Na'sh, and al-Haud, the Pond,^[2]
In Chinese, 文昌 (Wén Chāng), meaning Administrative Center, refers to an asterism consisting of υ Ursae Majoris, 44 Lyncis, φ Ursae Majoris, θ Ursae Majoris, 15 Ursae Majoris and 18 Ursae Majoris. Consequently, υ Ursae Majoris itself is known as 文昌一 (Wén Chāng yī, English: the first Star of Administrative Center.).^[3]

References

1 2 3 Balona, L. A.; Dziembowski, W. A. (October 1999), "Excitation and visibility of high-degree modes in stars", Monthly Notices of the Royal Astronomical Society 309 (1): 221–232, Bibcode:1999MNRAS.309..221B, doi:10.1046/j.1365-8711.1999.02821.x
↑ Allen, Richard Hinckley (1899), Star-Names and Their Meanings, New York: G. E. Stechert, p. 442
↑ (Chinese) AEEA (Activities of Exhibition and Education in Astronomy) 天文教育資訊網 2006 年 6 月 16 日

Stars of Ursa Major

Bayer	α (Dubhe) β (Merak) γ (Phecda) δ (Megrez) ε (Alioth) ζ (Mizar) η (Alkaid) θ (Alhaud) ι (Talitha Bor) 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 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 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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