18055+0230 STF2272AB (70 Oph)

Coord 2000	18055+0230		Discov num	STF2272		Comp	AB		Coord arcsec 2000	18 05 27.37 +02 29 59.3
Date first	1777		Date last	2019		Obs	1726
Pa first	82		Pa last	122		P.A. Now (θ)	120.9°
Sep first	7.0		Sep last	6.6		Sep. Now (ρ)	6.67"
Mag pri	4.22		Mag sec	6.17		delta mag (ΔM)	1.95		Spectral class	K0V+K4V (yellow-orange/yellow-orange)
Pri motion ra	+028		Sec motion ra	+044
Pri motion dec	-109		Sec motion dec	-125
Notes	N O P (See Notes, Orbital solution, 100-year proper motion)

rPM=0.171 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	70 Oph	123107	18055+0230	STF2272	AB	1777	2019	1726	121	6.7	4.22	6.17	1.95	Y	<===
Show		123107	18055+0230	STF2272	AC	1878	2013	58	326	93.1	4.22	12.05	7.83
Show		123107	18055+0230	STF2272	AD	1905	2009	20	315	129.3	4.22	14.36	10.14
Show		123107	18055+0230	TNN 9	AE	2004	2004	1	231	9.4	1.79	13.01	11.22
Show		123107	18055+0230	TNN 9	AF	2004	2004	1	196	11.5	1.79	13.82	12.03
Show		123107	18055+0230	STF2272	AR	1905	2012	27	26	164.8	4.22	12.87	8.65
Show		123107	18055+0230	STF2272	AS	1878	2009	37	10	202.6	4.22	12.45	8.23
Show		123107	18055+0230	STF2272	AT	1905	2013	28	45	128.4	4.22	12.25	8.03
Show		123107	18055+0230	STF2272	AU	1905	2009	17	337	255.5	4.22	13.79	9.57
Show		123107	18055+0230	STF2272	AV	1886	2013	41	276	144.5	4.22	10.83	6.61
Show		123107	18055+0230	STF2272	AY	1924	2009	4	357	250.5	4.22	14.73	10.51
Show		123107	18055+0230	STF2272	AZ	2000	2000	1	163	68.3	4.22	16.04	11.82
Show		123107	18055+0230	STF2272	BC	1899	2000	5	322	81.2	6.17	12.05	5.88
Show		123107	18055+0230	STF2272	BD	1900	2000	3	311	120.0	6.17	14.36	8.19
Show		123107	18055+0230	STF2272	BR	1908	2000	23	29	154.3	6.17	12.87	6.70
Show		123107	18055+0230	STF2272	BZ	1900	2000	3	163	70.2	6.17	16.04	9.87
Show			18055+0230	STF2272	VT	1905	2015	28	72	247.5	10.83	12.25	1.42
Show			18055+0230	STF2272	VW	1906	2015	11	270	180.6	10.83	11.77	0.94
Show			18055+0230	STF2272	VX	1906	2015	10	253	17.5	10.83	13.88	3.05

15-fold system
15 visible stars in this system

Precise pa	121.8		Precise sep	6.645		Name	70 Oph		Other name	p Oph
Var name	V2391 Oph		Constellation	Ophiuchus		SAO	123107		HIP	88601
Tycho2	0434-05213-1		Gaia DR2	4468557989937892096		HD	165341		HR	6752
GC	24641		ADS	11046		GL	Gl 702A		BD	BD+02 3482
Flamsteed	70 Ophiuchi		Flamsteed name	70 Oph		Distance	5.08		Distance ly	16.57
last precise pa	121.8		last precise sep	6.645

Period (P)	88.3983y	± 0.0384	Periastron (T)	1895.8216y	± 0.0525	Semi-major axis (a)	4.55038a	± 0.00625
Eccentricity (e)	0.49803	± 0.00052	Inclination (i)	120.892°	± 0.089	Longitude of periastron (ω)	193.376°	± 0.252
Node (Ω)	121.692°	± 0.126	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label rho theta 2000 3.727 148.4 2001 3.974 145.8 2002 4.211 143.6 2003 4.437 141.6 2004 4.652 139.8 2005 4.856 138.1 2006 5.049 136.6 2007 5.231 135.2 2008 5.402 133.8 2009 5.562 132.6 2010 5.711 131.4 2011 5.849 130.3 2012 5.977 129.2 2013 6.094 128.2 2014 6.201 127.2 2015 6.298 126.2 2016 6.385 125.3 2017 6.462 124.4 2018 6.529 123.5 2019 6.587 122.6 2020 6.635 121.8 2021 6.674 120.9 2022 6.704 120.1 2023 6.724 119.2 2024 6.736 118.4 2025 6.738 117.6 2026 6.732 116.7 2027 6.717 115.9 2028 6.693 115.1 2029 6.661 114.2 2030 6.620 113.4		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
18055+0230	STF2272	AB	2007	1681	134	5.4	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2008	1685	133	5.7	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2009	1690	132	5.7	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2010	1699	131	5.8	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2012	1713	128	6.2	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2013	1730	130	5.9	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2014	1697	128	6.2	4.22	6.17	K0V K4V	NODP	180527.37+022959.3
18055+0230	STF2272	AB	2015	1698	126	6.6	4.22	6.17	K0V+K4V	NO P	180527.37+022959.3
18055+0230	STF2272	AB	2016	1706	124	6.6	4.22	6.17	K0V+K4V	NO P	180527.37+022959.3
18055+0230	STF2272	AB	2017	1709	124	6.5	4.22	6.17	K0V+K4V	NO P	180527.37+022959.3
18055+0230	STF2272	AB	2018	1713	121	6.8	4.22	6.17	K0V+K4V	NO P	180527.37+022959.3
18055+0230	STF2272	AB	2019	1721	122	6.6	4.22	6.17	K0V+K4V	NO P	180527.37+022959.3

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