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Doubles in this session

Current system

18443+3940
STF2382AB
Eps1 Lyr

Nearby doubles

16' : 18457+3942
BU 51AB

21' : 18426+3937
HJ 1341

26' : 18433+3918
BLL 35

28' : 18453+4005
ROE 50AB

29' : 18452+3914
STF2392AB

30' : 18465+3958
LDS4799

36' : 18418+4001
LSC 83

41' : 18436+4020
SLE 122

43' : 18478+3954
GRV 240

45' : 18481+3929
COU1609

46' : 18453+3856
COU1608

49' : 18483+3956
SLW1221

55' : 18466+3853
ES 2021AB

56' : 18397+3955
TDT 981

60' : 18483+4018
UC 3676

60' : 18480+3858
ES 2572

61' : 18490+3914
COU1610

66' : 18404+4028
SLE 92

67' : 18466+4042
HDS2663

71' : 18501+4002
HU 1192

72' : 18450+4051
COU1792

73' : 18496+4020
UC 3687

73' : 18381+3935
BU 50AB

76' : 18397+4035
AG 225AB

76' : 18507+3920
HDS2672

80' : 18432+3822
HDS2651

Selections

Binocular doubles

Quadruple Systems

Multiple Systems

Neglected List I

Neglected List II

Herschel, J.F.W.

18443+3940 STF2382AB (Eps1 Lyr)

18^h 44^m 20.34^s +39° 40' 12.4" P.A. 344.20 sep 2.3 mag 5.15,6.10 Sp A4V+F1V dist. 49.78 pc (162.38 l.y.)

Coord 2000	18443+3940		Discov num	STF2382		Comp	AB		Coord arcsec 2000	18 44 20.34 +39 40 12.4
Date first	1777		Date last	2020		Obs	639
Pa first	45		Pa last	345		P.A. Now (θ)	344.2°
Sep first	4.0		Sep last	2.2		Sep. Now (ρ)	2.3"
Mag pri	5.15		Mag sec	6.10		delta mag (ΔM)	0.95		Spectral class	A4V+F1V (white/yellow-white)
Pri motion ra	+011		Sec motion ra	+002
Pri motion dec	+061		Sec motion dec	+047
Notes	N O (See Notes, Orbital solution)

rPM=0.269 (< 0.3, Physical double)

This double is physical.

18443+3940 SYSTEM COMPONENTS

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Eps1 Lyr	67310	18443+3940	STF2382	AB	1777	2020	639	344	2.3	5.15	6.10	0.95	Y	<===
Show	Double Double	67310	18443+3940	STFA 37	AB,CD	1830	2016	97	172	209.5	4.67	4.56	0.11
Show		67310	18443+3940	STFA 37	AD	1903	2017	18	172	210.5	5.15	5.38	0.23
Show		67310	18443+3940	STFA 37	AI	1863	2015	23	137	149.5	5.15	10.12	4.97
Show		67310	18443+3940	STFA 37	BC	1903	2011	14	172	210.9	6.10	5.25	0.85
Show		67310	18443+3940	STFA 37	BD	1903	2000	11	172	209.6	6.10	5.38	0.72
Show		67310	18443+3940	STFA 37	BI	1872	2015	10	137	151.3	6.10	10.12	4.02
Show		67315	18443+3940	CHR 77	Ca,Cb	1985	2005	5	43	0.2	5.25			Y
Show		67315	18443+3940	STF2383	CD	1777	2020	636	74	2.4	5.25	5.38	0.13	Y
Show		67315	18443+3940	SHJ 277	CD,F	2002	2015	3	0	93.3	4.56	12.70	8.14
Show		67315	18443+3940	SHJ 277	CD,G	2000	2015	4	293	75.1	4.56	14.20	9.64
Show		67315	18443+3940	SHJ 277	CD,H	2000	2015	4	313	95.7	4.56	13.90	9.34
Show		67315	18443+3940	STF2383	CE	2000	2015	8	334	63.2	5.25	12.30	7.05
Show		67315	18443+3940	STFA 37	CI	1863	2012	18	37	120.4	5.25	10.12	4.87
Show		67315	18443+3940	STFA 37	DI	1909	2000	6	37	121.6	5.38	10.12	4.74
Show		67315	18443+3940	SHJ 277	EF	1831	2015	15	37	45.6	12.30	12.70	0.40
Show		67315	18443+3940	SHJ 277	EG	1878	2015	11	236	50.0	12.30	14.20	1.90
Show		67315	18443+3940	STFA 37	EI	2000	2015	7	68	108.9	12.30	10.12	2.18
Show		67315	18443+3940	SHJ 277	GH	1878	2015	13	358	35.8	14.20	13.90	0.30

11-fold system
11 visible stars in this system

OTHER CATALOGS AND DESIGNATIONS

Precise pa	345.1		Precise sep	2.19		Name	Eps1 Lyr		Constellation	Lyra
SAO	67310		HIP	91919		Tycho2	3122-03438-2		Gaia DR2	60363229312
HD	173582		HR	7051		GC	25667		ADS	11635
BD	BD+39 3509		Bayer	Epsilon 1 Lyrae		Bayer name	Eps1 Lyr		Flamsteed	4 Lyrae
Flamsteed name	4 Lyr		Distance	49.78		Distance ly	162.38		last precise pa	345.1
last precise sep	2.19

ORBITAL ELEMENTS SOLUTION #1

Period (P)	1725y		Periastron (T)	190y		Semi-major axis (a)	4.17a
Eccentricity (e)	0.243		Inclination (i)	118.6°		Longitude of periastron (ω)	198°
Node (Ω)	198°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2003

label	rho	theta
2000	2.468	350.4
2001	2.460	350.1
2002	2.452	349.9
2003	2.444	349.6
2004	2.436	349.3
2005	2.428	349.0
2006	2.419	348.7
2007	2.411	348.4
2008	2.403	348.1
2009	2.395	347.8
2010	2.387	347.5
2011	2.378	347.2
2012	2.370	347.0
2013	2.362	346.7
2014	2.354	346.3
2015	2.346	346.0
2016	2.337	345.7
2017	2.329	345.4
2018	2.321	345.1
2019	2.313	344.8
2020	2.305	344.5
2021	2.296	344.2
2022	2.288	343.8
2023	2.280	343.5
2024	2.272	343.2
2025	2.264	342.9
2026	2.256	342.5
2027	2.248	342.2
2028	2.240	341.9
2029	2.231	341.5
2030	2.223	341.2

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

grafico orbita

wds18443%2B3940a.png orbit plot

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

ORBITAL ELEMENTS SOLUTION #2

Period (P)	2802.8y		Periastron (T)	2051.49y		Semi-major axis (a)	14.237a
Eccentricity (e)	0.953		Inclination (i)	102.2°		Longitude of periastron (ω)	258.8°
Node (Ω)	149.6°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2020

label	rho	theta
2000	2.484	350.3
2001	2.472	350.0
2002	2.460	349.7
2003	2.448	349.5
2004	2.436	349.2
2005	2.423	348.9
2006	2.410	348.6
2007	2.396	348.3
2008	2.382	348.0
2009	2.368	347.7
2010	2.353	347.4
2011	2.338	347.1
2012	2.323	346.8
2013	2.307	346.5
2014	2.290	346.2
2015	2.273	345.9
2016	2.255	345.6
2017	2.237	345.2
2018	2.218	344.9
2019	2.198	344.5
2020	2.178	344.2
2021	2.157	343.8
2022	2.135	343.5
2023	2.112	343.1
2024	2.088	342.7
2025	2.064	342.3
2026	2.038	341.9
2027	2.011	341.5
2028	1.983	341.1
2029	1.953	340.7
2030	1.922	340.3

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

grafico orbita

wds18443%2B3940g.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
18443+3940	STF2382	AB	2007	558	349	2.3	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2008	563	348	2.3	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2009	566	348	2.4	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2010	581	347	2.3	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2011	588	349	2.4	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2012	590	347	2.2	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2013	599	346	2.3	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2014	588	346	2.2	5.15	6.10	A4V F1V	NOD	184420.34+394012.4
18443+3940	STF2382	AB	2015	600	346	2.4	5.15	6.10	A4V+F1V	NO	184420.34+394012.4
18443+3940	STF2382	AB	2016	615	346	2.3	5.15	6.10	A4V+F1V	NO	184420.34+394012.4
18443+3940	STF2382	AB	2017	619	346	2.3	5.15	6.10	A4V+F1V	NO	184420.34+394012.4
18443+3940	STF2382	AB	2018	621	346	2.2	5.15	6.10	A4V+F1V	NO	184420.34+394012.4
18443+3940	STF2382	AB	2019	628	345	2.2	5.15	6.10	A4V+F1V	NO	184420.34+394012.4

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