18443+3940 CHR 77 Ca,Cb

18^h 44^m 22.78^s +39° 36' 45.8" P.A. 225.00 sep 0.1 mag 5.25, Sp A6IV dist. 47.69 pc (155.56 l.y.)

Coord 2000	18443+3940		Discov num	CHR 77		Comp	Ca,Cb		Coord arcsec 2000	18 44 22.78 +39 36 45.8
Date first	1985		Date last	2005		Obs	5
Pa first	66		Pa last	224.5		P.A. Now (θ)	224.5°
Sep first	0.2		Sep last	0.058		Sep. Now (ρ)	0.058"
Mag pri	5.25		Mag sec			delta mag (ΔM)			Spectral class	A6IV (white)
Pri motion ra	+008		Sec motion ra
Pri motion dec	+054		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

18443+3940 SYSTEM COMPONENTS

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

OTHER CATALOGS AND DESIGNATIONS

Var name	NSV11301 Lyr		Constellation	Lyra		SAO	67315		HIP	91926
Tycho2	3122-03439-1		Gaia DR2	2098202128093842432		HD	173607		HR	7053
GC	25668		ADS	11635		BD	BD+39 3510		Bayer	Epsilon 2 Lyrae
Bayer name	Eps2 Lyr		Flamsteed	5 Lyrae		Flamsteed name	5 Lyr		Distance	47.69
Distance ly	155.56		Bayer greek	ε² Lyr

ORBITAL ELEMENTS

Period (P)	15.75y		Periastron (T)	2008.94y		Semi-major axis (a)	0.191a
Eccentricity (e)	0.411		Inclination (i)	109.9°		Longitude of periastron (ω)	127.2°
Node (Ω)	42.4°		Notes	n		Reference	Doc2020e
Equinox	2000		Last observation	2005		Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	77.4	0.142
2001	67.1	0.177
2002	60.0	0.205
2003	54.4	0.224
2004	49.4	0.230
2005	44.3	0.219
2006	38.2	0.188
2007	28.0	0.131
2008	350.2	0.053
2009	243.9	0.079
2010	220.8	0.130
2011	206.0	0.129
2012	186.8	0.103
2013	155.1	0.082
2014	115.9	0.086
2015	89.2	0.115
2016	74.3	0.151
2017	65.1	0.184
2018	58.5	0.211
2019	53.1	0.226
2020	48.2	0.229
2021	42.9	0.214
2022	36.2	0.176
2023	23.6	0.112
2024	319.3	0.041
2025	235.5	0.097
2026	217.1	0.133
2027	201.9	0.123
2028	180.3	0.097
2029	145.1	0.080
2030	107.8	0.092

grafico orbita

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

wds18443%2B3940i.png orbit plot

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