13239+5456 PEA   1Aa,Ab

Coord 2000	13239+5456		Discov num	PEA   1		Comp	Aa,Ab		Coord arcsec 2000	13 23 55.42 +54 55 31.5
Date first	1925		Date last	2004		Obs	63
Pa first	247		Pa last	34		P.A. Now (θ)	34°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0"
Mag pri	3.00		Mag sec	3.00		delta mag (ΔM)	0		Spectral class	A1VpSrSi (white)
Pri motion ra	+122		Sec motion ra
Pri motion dec	-020		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		28737	13239+5456	PEA 1	Aa,Ab	1925	2004	63	34	0.0	3.00	3.00	0.00	Y	<===
Show	Mizar, Alcor	28737	13239+5456	STF1744	AB	1755	2019	497	154	14.6	2.23	3.88	1.65
Show		28737	13239+5456	STF1744	AC	1831	2017	14	72	707.7	2.23	4.01	1.78
Show		28737	13239+5456	SMR 4	AD	1913	2017	10	102	492.8	2.23	7.62	5.39
Show		28737	13239+5456	SHY 247	AE	1991	1999	3	321	999.9	2.23	6.88	4.65
Show		28737	13239+5456	SHY 247	AF	1991	1999	3	359	999.9	2.23	9.86	7.63
Show		28751	13239+5456	PSF 1	Ca,Cb	2007	2009	5	207	1.0	4.01	8.00	3.99
Show		28751	13239+5456	SHY 248	CE	1991	1999	3	317	999.9	4.01	6.88	2.87
Show		28751	13239+5456	SHY 248	CF	1991	1999	3	355	999.9	4.01	9.86	5.85
Show		28751	13239+5456	SHY 248	CG	1991	1999	3	271	999.9	4.01	8.21	4.20
Show		28751	13239+5456	SHY 248	CH	1991	1999	3	243	999.9	4.01	8.63	4.62

Decuple system
8 visible stars in this system

Precise pa	33.7		Precise sep	0.008		Constellation	Ursa Major		SAO	28737
HIP	65378		Gaia DR2	79345330944		HD	116656		HR	5054
GC	18133		ADS	8891		GL	NN 3783A		BD	BD+55 1598
Bayer	Zeta Ursae Majoris		Bayer name	Zet UMa		Flamsteed	79 Ursae Majoris		Flamsteed name	79 UMa
Distance	26.31		Distance ly	85.82		last precise pa	33.7		last precise sep	0.008

Period (P)	20.53835d	± 0.00005	Periastron (T)	47636.07d (1989.299y)	± 0.02	Semi-major axis (a)	9.83m	± 0.03
Eccentricity (e)	0.5354	± 0.0025	Inclination (i)	60.5°	± 0.3	Longitude of periastron (ω)	104.3°	± 0.3
Node (Ω)	106°	± 0.4	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1997

label rho theta 2000-01-01 0.007 349.7 2001-01-01 0.007 291.8 2002-01-01 0.009 102.5 2003-01-01 0.010 70.5 2004-01-01 0.007 27.5 2005-01-01 0.007 326.9 2006-01-01 0.002 225.7 2007-01-01 0.010 89.3 2008-01-01 0.009 56.9 2009-01-01 0.007 4.4 2010-01-01 0.008 306.0 2011-01-01 0.007 115.2 2012-01-01 0.010 77.9 2013-01-01 0.008 40.0 2014-01-01 0.007 340.6 2015-01-01 0.006 279.6 2016-01-01 0.009 96.9 2017-01-01 0.010 65.6 2018-01-01 0.007 18.9 2019-01-01 0.008 318.8 2020-01-01 0.003 150.2 2021-01-01 0.010 84.8 2022-01-01 0.009 50.8 2023-01-01 0.007 355.1 2024-01-01 0.007 297.4 2025-01-01 0.008 106.4 2026-01-01 0.010 73.3 2027-01-01 0.008 32.3 2028-01-01 0.007 331.9 2029-01-01 0.004 256.8 2030-01-01 0.010 92.0 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

Period (P)	36.5y	± 2	Periastron (T)	1994.8y	± 1	Semi-major axis (a)	0.78a	± 0.03
Eccentricity (e)	0.6	± 0.2	Inclination (i)	93°	± 7	Longitude of periastron (ω)	287°	± 14
Node (Ω)	32°	± 10	Note			Grade	9	(1=Definitive, 9=Indet.)
Equinox			Last observation

label rho theta 2000 0.477 28.4 2001 0.437 27.2 2002 0.387 25.7 2003 0.330 23.8 2004 0.268 20.9 2005 0.203 16.3 2006 0.138 7.3 2007 0.081 344.3 2008 0.064 286.6 2009 0.108 247.4 2010 0.171 233.8 2011 0.237 227.6 2012 0.303 224.1 2013 0.367 221.8 2014 0.429 220.2 2015 0.488 219.0 2016 0.544 218.1 2017 0.595 217.3 2018 0.642 216.6 2019 0.684 216.1 2020 0.719 215.6 2021 0.747 215.1 2022 0.766 214.7 2023 0.776 214.2 2024 0.773 213.8 2025 0.755 213.4 2026 0.719 212.9 2027 0.659 212.4 2028 0.567 211.7 2029 0.432 210.7 2030 0.238 208.4 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
13239+5456	PEA 1	Aa,Ab	1997	60	136	0.0	2.23		A1VpSrSi	NO	132355.42+545531.5
13239+5456	PEA 1	Aa,Ab	2004	63	34	0.0	2.23		A1VpSrSi	NO	132355.42+545531.5

If you need more information about this double, apply for a data request form to the WDS.