11037+6145 BU 1077 AB (Dubhe)

11^h 03^m 43.84^s +61° 45' 04.0" P.A. 342.00 sep 0.8 mag 2.02,4.95 Sp G9III dist. 37.68 pc (122.91 l.y.)

Coord 2000	11037+6145	Discov num	BU 1077	Comp	AB	Coord arcsec 2000	11 03 43.84 +61 45 04.0
Date first	1889	Date last	2017	Obs	83
Pa first	326	Pa last	342.3	P.A. Now (θ)	323.2°
Sep first	0.9	Sep last	0.806	Sep. Now (ρ)	0.819"
Mag pri	2.02	Mag sec	4.95	delta mag (ΔM)	2.93	Spectral class	G9III (yellow)
Pri motion ra	-119	Sec motion ra
Pri motion dec	-067	Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

11037+6145 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Dubhe	15384	11 03 44 +61 45 04	BU 1077 AB	2017	83	342	0.8	2.02	4.95	2.93	Y	<===
Show		15384	11 03 44 +61 45 04	BU 1077 AC	2020	15	206	384.5	2.02	7.19	5.17

Triple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Dubhe	Var name	NSV5070 UMa	Constellation	Ursa Major	SAO	15384
HIP	54061	Tycho2	4146-01274-1	HD	95689	HR	4301
GC	15185	ADS	8035	BD	BD+62 1161	Bayer	Alpha Ursae Majoris
Bayer name	Alp UMa	Flamsteed	50 Ursae Majoris	Flamsteed name	50 UMa	FK5	417
Distance	37.68	Distance ly	122.91	Bayer greek	α UMa

Other names

DUBB, AK

Meaning

Bear

ORBITAL ELEMENTS

Period (P)	44.448y	± 0.11	Periastron (T)	2002.17y	± 0.094	Semi-major axis (a)	0.59a	± 0.026
Eccentricity (e)	0.4392	± 0.004	Inclination (i)	159.9°	± 3.5	Longitude of periastron (ω)	232.8°	± 7.9
Node (Ω)	9.3°	± 8.2	Notes	n		Reference	Sca2011a
Equinox	2000		Last observation	2010		Grade	2	(1=Definitive, 9=Indet.)

label	theta	rho
2000	183.7	0.366
2001	164.4	0.338
2002	142.2	0.320
2003	118.6	0.318
2004	96.1	0.335
2005	76.6	0.367
2006	60.7	0.408
2007	47.9	0.453
2008	37.3	0.498
2009	28.5	0.542
2010	21.0	0.582
2011	14.4	0.619
2012	8.5	0.653
2013	3.2	0.683
2014	358.3	0.710
2015	353.7	0.734
2016	349.4	0.754
2017	345.4	0.772
2018	341.4	0.786
2019	337.6	0.798
2020	334.0	0.807
2021	330.3	0.813
2022	326.8	0.817
2023	323.2	0.819
2024	319.7	0.818
2025	316.1	0.814
2026	312.5	0.809
2027	308.8	0.801
2028	305.0	0.791
2029	301.2	0.779
2030	297.2	0.765

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS 11037+6145 BU 1077 AB (Dubhe) : NOTES

discov_num	notes	refcode
BU 1077	alp UMa = 50 UMa = Dubhe.
	Soderhjelm (1999) orbit has low incl. fixed at 180 deg; observations	Sod1999
	are lacking near periastron. Pair has a giant primary according to
	isochrone fit.
	Faint, distant pair at 385", 7.60V. Possible common proper motion
	with the SB HD 95638 at 280".
	See Baize & Petit (1989) catalog of doubles with variable component.	Baz1989d
	photocentric (astrometric) orbit based on combination of ground-	Gon2002a
	based catalogs with Hipparcos.
	Companion could not be seen any more the following years.	VBs1954
	Mk III Limb-darkened diameter 7.6 +/- 0.4 mas.	MkT1988
	Mk III Limb-darkened diameter 7.11 +/- 0.10 mas.	MkT2001
	Mk III Limb-darkened diameter 6.739 +/- 0.099 mas.	MkT2003
	NPOI Limb-darkened diameter 6.91 +/- 0.08 mas.	NOI2001b
	NPOI Limb-darkened diameter 6.419 +/- 0.041 mas, Sp = G9III,	NOI2018
	R =17.03 +/- 0.13 \rsun, Teff = 5012 +/- 65 K, L = 165.1 +/- 8.3 \lsun,
	M = 3.44 +/- 0.11 \msun, Age = 0.28 +/- 0.03 Gyr.
	AB: Malkov et al. (2012) derive dynamical and spectroscopic masses
	5.56 +/- 0.80 and 2.75 Msun, respectively.	Mlk2012
	Spectroscopic orbital elements have been determined.	XXX2018e

REFERENCES

refcode	metd	author	reference
Baz1989d	-	Baize, P. & Petit, M.	1989A&AS...77..497B
Baz1989d		A&AS 77, 497, 1989
Gon2002a	orb -	Gontcharov, G.A. & Kiyaeva, O.V.	2002SvAL...28..261G
Gon2002a		SvAL 28, 261, 2002
MkT1988	not j	Shao, M., Colavita, M.M., Hines, B.E., Staelin, D.H., Hutter, D.J., Johnston, K.J.,	1988ApJ...327..905S
MkT1988		Mozurkewich, D., Simon, R.S., Hershey, J.L., Hughes, J.A. & Kaplan, G.H.	.
MkT1988		ApJ 327, 905, 1988	.
MkT2001	not j	Nordgren, T.E., Sudol, J.J. & Mozurkewich, D.	2001AJ....122.2707N
MkT2001		AJ 122, 2707, 2001	.
MkT2003	Km -	Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A.,	2003AJ....126.2502M
MkT2003	+not	Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003		AJ 126, 2502, 2003
Mlk2012	not -	Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A.	2012A&A...546A..69M
Mlk2012		A&A 546, A69, 2012
NOI2001b	not j	Nordgren, T.E., Sudol, J.J. & Mozurkewich, D.	2001AJ....122.2707N
NOI2001b		AJ 122, 2707, 2001	.
NOI2018	not j	Baines, E.K., Armstrong, J.T., Schmitt, H.R., Zavala, R.T., Benson, J.A., Hutter,	2018AJ....155...30B
NOI2018		D.J., Tycner, C. & van Belle, G.T.
NOI2018		AJ 155, 30, 2018
Sca2011a	S j	Scardia, M., Prieur, J.-L., Pansecchi, L., Argyle, R.W., & Sala, M.	2011AN....332..508S
Sca2011a	+orb	AN 332, 508, 2011
Sod1999	orb -	Soderhjelm, S.	1999A&A...341..121S
Sod1999		A&A 341, 121, 1999
VBs1954	Ma -	Van Biesbroeck, G.	1954PYerO...8....6V
VBs1954	+Mb	Pub. Yerkes Obs. 8, pt. 6, 1954
VBs1954	+orb
XXX2018e	not -	Gray, D.F.	2018ApJ...869...81G
XXX2018e		ApJ 869, 81, 2018
XXX2018e	not -	Gray, D.F.	2018ApJ...869...81G
XXX2018e		ApJ 869, 81, 2018

DISCOVERER

idgroup	discov	author
1	BU	Burnham, S.W. (BU 1 - 81)

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
11037+6145	BU 1077	AB	2006	65	57	0.4	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2007	66	44	0.5	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2009	69	26	0.6	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2010	73	18	0.6	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2011	75	10	0.6	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2012	76	5	0.7	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2013	78	0	0.7	2.02	4.95	G9III	NOD	110343.84+614504.0
11037+6145	BU 1077	AB	2014	79	355	0.7	2.02	4.95	G9III	NO	110343.84+614504.0
11037+6145	BU 1077	AB	2017	81	342	0.8	2.02	4.95	G9III	NO	110343.84+614504.0

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WDS 11037+6145 BU 1077 AB (Dubhe) : VISUAL OBSERVATIONS REPORTS

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	19/07/12	shavarsh	easy	separated		very interesting	The main star was visibly large versus described yellow.

WDS 11037+6145 BU 1077 AB (Dubhe) : MEASURES

No records found.

WDS 11037+6145 (Dubhe) : VIRTUAL EYEPIECE

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WDS 11037+6145 (Dubhe) : ALADIN DSS IMAGE @

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS

Error -22130
Not valid ID.

Error -22130
Not valid ID.
Error -27220
Not valid ID.