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Doubles in this session

Current system

10200+1950
STF1424AB
Algieba

Nearby doubles

18' : 10192+2008
CVR1280

23' : 10197+1928
WNO 53

30' : 10178+2000
A 2149AB

43' : 10168+1955
CVR1276

44' : 10192+2034
STF1423

55' : 10199+1856
CVR1282

59' : 10213+1859
TDS7209

61' : 10192+1850
COU 289

70' : 10208+2058
SLW 464

72' : 10151+1907
STF1417

72' : 10248+2002
FMR 215

78' : 10149+2022
LDS3969

98' : 10217+2124
HJL1058

98' : 10168+1822
HJ 478AB

99' : 10264+1951
GWP1372

100' : 10125+1942
COU 288

101' : 10120+2007
HJ 476

101' : 10269+1931
COU 292

103' : 10143+2104
BWL 25

106' : 10210+1809
COU 50

113' : 10280+1950
STF1435

117' : 10217+2144
COU 171

119' : 10203+1753
COU 290

125' : 10269+2106
CVR1291

126' : 10187+2155
COU 170

128' : 10176+2155
LDS3973

Selections

Binocular doubles

Quadruple Systems

Multiple Systems

Neglected List I

Neglected List II

Herschel, J.F.W.

10200+1950 STF1424AB (Algieba)

10^h 19^m 58.35^s +19° 50' 29.4" P.A. 126.4 sep 4.72 mag 2.37,3.64 Sp K0III dist. 39.89 pc (130.12 l.y.)

Coord 2000	10200+1950		Discov num	STF1424		Comp	AB		Coord arcsec 2000	10 19 58.35 +19 50 29.4
Date first	1820		Date last	2017		Obs	848
Pa first	99		Pa last	126		P.A. Now (θ)	126.4°
Sep first	3.7		Sep last	4.8		Sep. Now (ρ)	4.72"
Mag pri	2.37		Mag sec	3.64		delta mag (ΔM)	1.27		Spectral class	K0III (yellow-orange)
Pri motion ra	+311		Sec motion ra	+306
Pri motion dec	-153		Sec motion dec	-161
Notes	N O (See Notes, Orbital solution)

rPM=0.027 (< 0.3, Physical double)

This double is physical.

10200+1950 SYSTEM COMPONENTS

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Algieba	81298	10200+1950	STF1424	AB	1820	2017	848	126	4.7	2.37	3.64	1.27	Y	<===
Show		81298	10200+1950	STF1424	AC	1851	2016	31	288	341.2	2.37	9.64	7.27
Show		81298	10200+1950	STF1424	AD	1904	2016	15	302	371.3	2.37	10.62	8.25
Show		81298	10200+1950	STF1424	BC	1877	1998	9	288	327.4	3.64	9.64	6.00
Show		81292	10200+1950	BAG 32	Ca,Cb	1981	1983	3	337	0.1	9.64			Y
Show		81292	10200+1950	STF1424	CD	1852	2016	30	6	90.7	9.64	10.62	0.98
Show		81292	10200+1950	FYM 38	CE	1998	2012	3	59	148.6	9.64	12.95	3.31
Show		81292	10200+1950	FYM 38	CF	1998	2012	3	238	53.4	9.64	14.10	4.46

Septuple system
6 visible stars in this system

OTHER CATALOGS AND DESIGNATIONS

Precise pa	125.5		Precise sep	4.776		Common name	Algieba		Other names	Algeiba
Cdsa2 id	STF 1424 AB		Constellation	Leo		SAO	81298		HIP	50583
Tycho2	1423-01349-1		HD	89484		HR	4057		GC	14177
ADS	7724		BD	BD+20 2467		Bayer	Gamma 1 Leonis		Bayer name	Gam1 Leo
Flamsteed	41 Leonis		Flamsteed name	41 Leo		Ra deg	10.332875		De deg	19.8415
Distance	39.89		Distance ly	130.12		last precise pa	125.5		last precise sep	4.776

ORBITAL ELEMENTS SOLUTION #1

Period (P)	554y	± 27	Periastron (T)	1769y	± 13	Semi-major axis (a)	3.1a	± 0.1
Eccentricity (e)	0.93	± 0.02	Inclination (i)	41°	± 5	Longitude of periastron (ω)	114°	± 10
Node (Ω)	188°	± 14	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label	rho	theta
2000	4.646	125.0
2001	4.651	125.1
2002	4.656	125.1
2003	4.660	125.2
2004	4.665	125.3
2005	4.670	125.4
2006	4.674	125.5
2007	4.678	125.5
2008	4.683	125.6
2009	4.687	125.7
2010	4.691	125.8
2011	4.695	125.9
2012	4.699	125.9
2013	4.703	126.0
2014	4.707	126.1
2015	4.711	126.2
2016	4.714	126.2
2017	4.718	126.3
2018	4.722	126.4
2019	4.725	126.5
2020	4.728	126.6
2021	4.732	126.6
2022	4.735	126.7
2023	4.738	126.8
2024	4.741	126.9
2025	4.744	126.9
2026	4.747	127.0
2027	4.750	127.1
2028	4.753	127.2
2029	4.755	127.2
2030	4.758	127.3

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

grafico orbita

wds10200%2B1950b.png orbit plot

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

ORBITAL ELEMENTS SOLUTION #2

Period (P)	554y	± 27	Periastron (T)	1750y	± 16	Semi-major axis (a)	3.1a	± 0.1
Eccentricity (e)	0.9	± 0.03	Inclination (i)	49°	± 6	Longitude of periastron (ω)	309°	± 6
Node (Ω)	347°	± 9	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label	rho	theta
2000	4.666	125.8
2001	4.671	125.9
2002	4.676	126.0
2003	4.681	126.1
2004	4.686	126.2
2005	4.690	126.2
2006	4.695	126.3
2007	4.699	126.4
2008	4.703	126.5
2009	4.708	126.6
2010	4.712	126.6
2011	4.716	126.7
2012	4.720	126.8
2013	4.724	126.9
2014	4.728	127.0
2015	4.731	127.0
2016	4.735	127.1
2017	4.739	127.2
2018	4.742	127.3
2019	4.746	127.4
2020	4.749	127.4
2021	4.752	127.5
2022	4.756	127.6
2023	4.759	127.7
2024	4.762	127.8
2025	4.765	127.8
2026	4.768	127.9
2027	4.771	128.0
2028	4.773	128.1
2029	4.776	128.1
2030	4.778	128.2

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

grafico orbita

wds10200%2B1950c.png orbit plot

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

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
10200+1950	STF1424	AB	2008	769	126	4.4	2.37	3.64	K0III	NODV	101958.16+195030.7
10200+1950	STF1424	AB	2010	800	126	4.7	2.37	3.64	K0III	NOD	101958.16+195030.7
10200+1950	STF1424	AB	2012	805	126	4.3	2.37	3.64	K0III	NOD	101958.16+195030.7
10200+1950	STF1424	AB	2013	822	126	4.6	2.37	3.64	K0III	NOD	101958.16+195030.7
10200+1950	STF1424	AB	2014	823	127	4.6	2.37	3.64	K0III	NOD	101958.16+195030.7
10200+1950	STF1424	AB	2015	834	127	4.7	2.37	3.64	K0III	NO	101958.16+195030.7
10200+1950	STF1424	AB	2016	843	126	4.7	2.37	3.64	K0III	NO	101958.35+195029.4
10200+1950	STF1424	AB	2017	848	126	4.8	2.37	3.64	K0III	NO	101958.35+195029.4

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