18443+3940 STF 2382 AB

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	2021		Obs	641
Pa first	45		Pa last	344.7		P.A. Now (θ)	344.7°
Sep first	4.0		Sep last	2.15		Sep. Now (ρ)	2.15"
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.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		67310	18 44 20 +39 40 12	STF 2382 AB	2021	641	345	2.2	5.15	6.10	0.95	Y	<===
Show	Double Double	67310	18 44 20 +39 40 12	STFA 37 AB,CD	2021	98	172	209.4	4.67	4.56	0.11
Show		67310	18 44 20 +39 40 12	STFA 37 AD	2021	19	172	208.2	5.15	5.38	0.23
Show		67310	18 44 20 +39 40 12	STFA 37 AI	2021	24	137	150.4	5.15	10.12	4.97
Show		67315	18 44 20 +39 40 14	STFA 37 BC	2011	14	172	210.9	6.10	5.25	0.85
Show		67315	18 44 20 +39 40 14	STFA 37 BD	2021	12	171	212.5	6.10	5.38	0.72
Show			18 44 20 +39 40 14	STFA 37 BI	2015	10	137	151.3	6.10	10.12	4.02
Show		67315	18 44 23 +39 36 46	CHR 77 Ca,Cb	2005	5	225	0.1	5.25			Y
Show		67315	18 44 23 +39 36 46	STF 2383 CD	2021	641	75	2.3	5.25	5.38	0.13	Y
Show		67315	18 44 23 +39 36 46	SHJ 277 CD,F	2015	3	0	93.3	4.56	12.70	8.14
Show		67315	18 44 23 +39 36 46	SHJ 277 CD,G	2015	4	293	75.1	4.56	14.20	9.64
Show		67315	18 44 23 +39 36 46	SHJ 277 CD,H	2015	4	313	95.7	4.56	13.90	9.34
Show		67310	18 44 23 +39 36 46	STF 2383 CE	2015	8	334	63.2	5.25	12.30	7.05
Show			18 44 23 +39 36 46	STFA 37 CI	2012	18	37	120.4	5.25	10.12	4.87
Show		67315	18 44 23 +39 36 46	STFA 37 DI	2000	6	37	121.6	5.38	10.12	4.74
Show		67310	18 44 20 +39 37 43	SHJ 277 EF	2021	16	37	45.4	12.30	12.70	0.40
Show		67310	18 44 20 +39 37 43	SHJ 277 EG	2015	11	236	50.0	12.30	14.20	1.90
Show			18 44 20 +39 37 43	STFA 37 EI	2015	7	68	108.9	12.30	10.12	2.18
Show			18 44 17 +39 37 16	SHJ 277 GH	2015	13	358	35.8	14.20	13.90	0.30

11-fold system
11 estimated visually detectable stars in this system

Constellation	Lyra		SAO	67310		HIP	91919		Tycho2	3122-03438-2
Gaia DR2	2098237660363229312		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
Bayer greek	ε1 Lyr

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°		Notes	n		Reference	WSI2004b
Equinox	2000		Last observation	2003		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 350.4 2.468 2001 350.1 2.460 2002 349.9 2.452 2003 349.6 2.444 2004 349.3 2.436 2005 349.0 2.428 2006 348.7 2.419 2007 348.4 2.411 2008 348.1 2.403 2009 347.8 2.395 2010 347.5 2.387 2011 347.2 2.378 2012 347.0 2.370 2013 346.7 2.362 2014 346.3 2.354 2015 346.0 2.346 2016 345.7 2.337 2017 345.4 2.329 2018 345.1 2.321 2019 344.8 2.313 2020 344.5 2.305 2021 344.2 2.296 2022 343.8 2.288 2023 343.5 2.280 2024 343.2 2.272 2025 342.9 2.264 2026 342.5 2.256 2027 342.2 2.248 2028 341.9 2.240 2029 341.5 2.231 2030 341.2 2.223		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

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°		Notes	n		Reference	Doc2020e
Equinox	2000		Last observation	2020		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 350.3 2.484 2001 350.0 2.472 2002 349.7 2.460 2003 349.5 2.448 2004 349.2 2.436 2005 348.9 2.423 2006 348.6 2.410 2007 348.3 2.396 2008 348.0 2.382 2009 347.7 2.368 2010 347.4 2.353 2011 347.1 2.338 2012 346.8 2.323 2013 346.5 2.307 2014 346.2 2.290 2015 345.9 2.273 2016 345.6 2.255 2017 345.2 2.237 2018 344.9 2.218 2019 344.5 2.198 2020 344.2 2.178 2021 343.8 2.157 2022 343.5 2.135 2023 343.1 2.112 2024 342.7 2.088 2025 342.3 2.064 2026 341.9 2.038 2027 341.5 2.011 2028 341.1 1.983 2029 340.7 1.953 2030 340.3 1.922		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

discov_num	notes	refcode
STF2382	A: eps 1 Lyr = 4 Lyr
	AB: A premature orbit has been computed.
STFA 37	AB,CD: See ADS for notes of components.	A__1932a
	AB and CD form the physical quadruple eps Lyrae, separation
	208". The observed small RV variations in each pair are probably
	merely scatter due to the very poor lines.
	BD: SHY 307. Bayesian analysis by Shaya & Olling (2011) indicates very	Shy2011
	high (near 100%) probability pair is physical.
STF2383	C: eps 2 Lyr = 5 Lyr
CHR 77	Ca: See note for 18323-1439 = CHR 73.	Hrt1996b
	Ca is an Alpha CVn-type variable.
	The measures show a large scatter and there are many observations of
	the wider pair without a measure of this close companion. The nature
	of the motion or even the reality of this pair is in question.	Tok2010b
STF2383	The longitude of periastron in the orbit of CD has been corrected.	Gzl1956a
SHJ 277	EF, EG, etc.: A preliminary sketch of the motions of the SHJ group
	show the G component may be flying away in position angle ~190	Dal2002a
STF2382	AB: H 2 5. STF2383CD: H 2 6.	MEv2010

refcode	metd	author	reference
A__1932a	Ma -	Aitken, R.G.	1932QB821.A43......
A__1932a		Aitken Double Star Catalogue, 1932
Dal2002a	Ma u	Daley, J.A.	2002DSO.....8....1D
Dal2002a	+C	Double Star Observer 8, #1, 2002
Doc2020e	orb -	Docobo, J.A. & Campo, P.	2020IAUDS.202....1S
Doc2020e		Inf. Circ. 202, 1, 2020
Gzl1956a	orb -	Guntzel-Lingner, U.	1956AN....283...73G
Gzl1956a		AN 283, 73, 1956
Hrt1996b	Sc j	Hartkopf, W.I., Mason, B.D., McAlister, H.A., Turner, N.H., Barry, D.J., Franz, .	1996AJ....111..936H
Hrt1996b		O.G., & Prieto, C.M
Hrt1996b		AJ 111, 936, 1996
MEv2010	-	MacEvoy, B.	...................
MEv2010		private communication, 2010 (see http://www.handprint.com/ASTRO/index.html)
Shy2011	-	Shaya, E.J. & Olling, R.	2011ApJS..192....2S
Shy2011		ApJS 192, 2, 2011
Shy2011		(Statistical analysis of probability that wide Hipparcos pairs are physical. Pairs
Shy2011		added to WDS only if probability 90% or greater.)
Tok2010b	S -	Tokovinin, A.	...................
Tok2010b		private communication
WSI2004b	Su j	Mason, B.D., Hartkopf, W.I., Wycoff, G.L., Rafferty, T.J., Urban, S., & Flagg, L.	2004AJ....128.3012M
WSI2004b	+orb	AJ 128, 3012, 2004

idgroup	discov	author
1	CHR	Center for High Ang. Res. Astronomy (speckle interferometry systems)
3	SHJ	South, J. & Herschel, J.
20	STF	Struve, F.G.W.

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
18443+3940	STF2382	AB	2020	639	345	2.2	5.15	6.10	A4V+F1V	NO	184420.34+394012.4
18443+3940	STF2382	AB	2021	641	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.

Show	date	username	difficulty	separation	pa_estim	interest	notes
Show	22/07/16	daedalus1	mean difficulty	separated	344		Seeing Pickering 6, Measure: theta 344, rho 2.5 +/- 0.168. Very nice, bright white pair, companion slightly yellow.

Show	date	username	difficulty	sep	sep_sigma	pa	pa_sigma	delta_mag	#	notes
Show	14/10/23	theophilusmonk	mean difficulty	2.00		342.00			4

Click on the map to see the double of your interest. Pass over with the mouse cursor to display the catalog designation.

Radius: auto 0.5" 0.8" 1" 2" 3" 5" 10" 15" 20" 25" 30" 35" 40" 45" 50" 55" 1' 2' 3' 4' 5' 6' 7' 8' 9' 10' 15' 20' 30' 40' 50' 1° 2° 4° 5° 8° Components only

DSS color DSS blue 2MASS AllWISE GALEX SDSS9 XMM PanSTARRS