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Doubles in session

Current system

15038+4739
STF1909
44 Boo

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

15038+4739 STF1909 (44 Boo)

15^h 03^m 47.30^s +47° 39' 14.6" P.A. 141.70 sep 0.2 mag 5.20,6.10 Sp F7V+K4V dist. 12.51 pc (40.81 l.y.)

Coord 2000	15038+4739		Discov num	STF1909		Comp			Coord arcsec 2000	15 03 47.30 +47 39 14.6
Date first	1819		Date last	2020		Obs	856
Pa first	228		Pa last	138		P.A. Now (θ)	141.7°
Sep first	1.5		Sep last	0.2		Sep. Now (ρ)	0.23"
Mag pri	5.20		Mag sec	6.10		delta mag (ΔM)	0.9		Spectral class	F7V+K4V (yellow-white/yellow-orange)
Pri motion ra	-444		Sec motion ra	-374
Pri motion dec	+010		Sec motion dec	+039
Notes	N O (See Notes, Orbital solution)

rPM=0.171 (< 0.3, Physical double)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	138		Precise sep	0.22		Name	44 Boo		Other name	i Boo
Var name	I Boo		Constellation	Bootes		SAO	45357		HIP	73695
Tycho2	3484-01580-1		HD	133640		HR	5618		GC	20281
ADS	9494		GL	Gl 575A		BD	BD+48 2259		Flamsteed	44 Bootis
Flamsteed name	44 Boo		Distance	12.51		Distance ly	40.81		last precise pa	138
last precise sep	0.22

ORBITAL ELEMENTS

Period (P)	214.7628y	± 2.2807	Periastron (T)	2011.9704y	± 0.1892	Semi-major axis (a)	3.70131a	± 0.02931
Eccentricity (e)	0.5145	± 0.00455	Inclination (i)	83.708°	± 0.093	Longitude of periastron (ω)	39.146°	± 0.813
Node (Ω)	56.678°	± 0.13	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label	rho	theta
2000	2.020	53.9
2001	2.025	54.4
2002	2.022	54.9
2003	2.009	55.5
2004	1.986	56.0
2005	1.953	56.6
2006	1.909	57.1
2007	1.853	57.8
2008	1.785	58.4
2009	1.705	59.1
2010	1.613	59.9
2011	1.510	60.8
2012	1.396	61.8
2013	1.272	63.0
2014	1.139	64.5
2015	0.999	66.4
2016	0.854	68.9
2017	0.704	72.5
2018	0.555	78.0
2019	0.411	87.5
2020	0.287	106.1
2021	0.225	141.7
2022	0.273	179.4
2023	0.391	200.0
2024	0.534	210.4
2025	0.685	216.3
2026	0.838	220.1
2027	0.991	222.7
2028	1.142	224.6
2029	1.291	226.0
2030	1.437	227.2

grafico orbita

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

wds15038%2B4739c.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
15038+4739	STF1909		2007	775	60	1.8	5.20	6.10	F7V+K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2008	777	59	1.7	5.20	6.10	F7V+K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2010	789	61	1.6	5.20	6.10	F7V+K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2011	795	62	1.5	5.20	6.10	F7V K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2012	796	63	1.2	5.20	6.10	F7V K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2013	798	63	1.2	5.20	6.10	F7V K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2014	811	66	1.1	5.20	6.10	F7V K4V	NOD	150347.30+473914.6
15038+4739	STF1909		2015	817	69	1.0	5.20	6.10	F7V+K4V	NO	150347.30+473914.6
15038+4739	STF1909		2016	832	72	0.9	5.20	6.10	F7V+K4V	NO	150347.30+473914.6
15038+4739	STF1909		2017	837	75	0.7	5.20	6.10	F7V+K4V	NO	150347.30+473914.6
15038+4739	STF1909		2018	843	81	0.5	5.20	6.10	F7V+K4V	NO	150347.30+473914.6
15038+4739	STF1909		2019	853	95	0.3	5.20	6.10	F7V+K4V	NO	150347.30+473914.6

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