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	2016		Obs	1707
Pa first	82		Pa last	124		P.A. Now (θ)	123.5°
Sep first	7.0		Sep last	6.6		Sep. Now (ρ)	6.5"
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)

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	2016	1707	124	6.5	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	6	322	81.2	6.17	12.05	5.88
Show		123107	18055+0230	STF2272	BD	1900	2000	4	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	2009	23	72	247.5	10.83	12.25	1.42
Show			18055+0230	STF2272	VW	1906	2009	6	270	180.4	10.83	11.77	0.94
Show			18055+0230	STF2272	VX	1906	2012	5	252	17.4	10.83	13.88	3.05

15-fold system
15 visible stars in this system

Name	70 Oph		Other name	p Oph		Var name	V2391 Oph		Constellation	Ophiuchus
SAO	123107		HIP	88601		Tycho2	0434-05213-1		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	124.3		last precise sep	6.55

Period (P)	32279d (88.38y)	± 15	Periastron (T)	45809d (1984.297y)	± 14	Semi-major axis (a)	4.526a	± 0.007
Eccentricity (e)	0.5005	± 0.0006	Inclination (i)	121.1°	± 0.1	Longitude of periastron (ω)	193.4°	± 0.3
Node (Ω)	121.7°	± 0.1	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox			Last observation

label rho theta 2000 3.709 148.5 2001 3.955 145.9 2002 4.191 143.7 2003 4.416 141.7 2004 4.630 139.8 2005 4.833 138.2 2006 5.026 136.6 2007 5.207 135.2 2008 5.377 133.9 2009 5.536 132.6 2010 5.684 131.4 2011 5.822 130.3 2012 5.949 129.2 2013 6.066 128.2 2014 6.173 127.2 2015 6.270 126.2 2016 6.356 125.3 2017 6.434 124.4 2018 6.501 123.5 2019 6.559 122.6 2020 6.607 121.8 2021 6.647 120.9 2022 6.677 120.1 2023 6.698 119.2 2024 6.710 118.4 2025 6.713 117.6 2026 6.708 116.8 2027 6.693 115.9 2028 6.670 115.1 2029 6.639 114.3 2030 6.599 113.4 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

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