18443+3940 STFA 37 AI

Coord 2000	18443+3940		Discov num	STFA 37		Comp	AI		Coord arcsec 2000	18 44 20.34 +39 40 12.4
Date first	1863		Date last	2021		Obs	24
Pa first	135		Pa last	137.4		P.A. Now (θ)	137.4°
Sep first	145.4		Sep last	150.36		Sep. Now (ρ)	150.36"
Mag pri	5.15		Mag sec	10.12		delta mag (ΔM)	4.97		Spectral class	A4V (white)
Pri motion ra	+011		Sec motion ra	-007
Pri motion dec	+061		Sec motion dec	-004
Notes	N (See Notes)

rPM=1.088 This double is not 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

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
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

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	STFA 37	AI	2008	14	138	150.1	5.15	10.43		N D	184420.34+394012.4
18443+3940	STFA 37	AI	2009	16	138	149.6	5.15	10.43		N D	184420.34+394012.4
18443+3940	STFA 37	AI	2010	17	138	149.1	5.15	10.43		N D	184420.34+394012.4
18443+3940	STFA 37	AI	2011	19	137	150.4	5.15	10.43		N D	184420.34+394012.4
18443+3940	STFA 37	AI	2012	20	138	150.0	5.15	10.43	A4V	N	184420.34+394012.4
18443+3940	STFA 37	AI	2013	21	138	150.2	5.15	10.43	A4V	N	184420.34+394012.4
18443+3940	STFA 37	AI	2015	23	137	149.5	5.15	10.12	A4V	N	184420.34+394012.4
18443+3940	STFA 37	AI	2021	24	137	150.4	5.15	10.12	A4V	N	184420.34+394012.4

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