18055+0230 STF 2272 AB (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	2021		Obs	1735
Pa first	82		Pa last	120.7		P.A. Now (θ)	119.2°
Sep first	7.0		Sep last	6.86		Sep. Now (ρ)	6.724"
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	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	70 Oph	123107	18 05 27 +02 29 59	STF 2272 AB	2021	1735	121	6.9	4.22	6.17	1.95	Y	<===
Show		123107	18 05 27 +02 29 59	STF 2272 AC	2013	58	326	93.1	4.22	12.05	7.83
Show		123107	18 05 27 +02 29 59	STF 2272 AD	2009	20	315	129.3	4.22	14.36	10.14
Show		123107	18 05 27 +02 29 59	TNN 9 AE	2004	1	231	9.4	4.22
Show		123107	18 05 27 +02 29 59	TNN 9 AF	2004	1	196	11.5	4.22
Show		123107	18 05 27 +02 29 59	STF 2272 AR	2012	27	26	164.8	4.22	12.87	8.65
Show		123107	18 05 27 +02 29 59	STF 2272 AS	2009	37	10	202.6	4.22	12.45	8.23
Show		123107	18 05 27 +02 29 59	STF 2272 AT	2013	28	45	128.4	4.22	12.25	8.03
Show		123107	18 05 27 +02 29 59	STF 2272 AU	2009	17	337	255.5	4.22	13.79	9.57
Show		123107	18 05 27 +02 29 59	STF 2272 AV	2013	41	276	144.5	4.22	10.83	6.61
Show		123107	18 05 27 +02 29 59	STF 2272 AY	2009	4	357	250.5	4.22	14.73	10.51
Show		123107	18 05 27 +02 29 59	STF 2272 AZ	2000	1	163	68.3	4.22	16.04	11.82
Show			18 05 27 +02 29 56	STF 2272 BC	2000	5	322	81.2	6.17	12.05	5.88
Show			18 05 27 +02 29 56	STF 2272 BD	2000	3	311	120.0	6.17	14.36	8.19
Show			18 05 27 +02 29 56	STF 2272 BR	2000	23	29	154.3	6.17	12.87	6.70
Show			18 05 27 +02 29 56	STF 2272 BZ	2000	3	163	70.2	6.17	16.04	9.87
Show			18 05 18 +02 30 00	STF 2272 VT	2015	28	72	247.5	10.83	12.25	1.42
Show			18 05 18 +02 30 00	STF 2272 VW	2015	11	270	180.6	10.83	11.77	0.94
Show			18 05 18 +02 30 00	STF 2272 VX	2015	10	253	17.5	10.83	13.88	3.05

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

Name	70 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

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	Notes	n		Reference	Izm2019
Equinox			Last observation	2015		Grade	1	(1=Definitive, 9=Indet.)

label theta rho 2000 148.4 3.727 2001 145.8 3.974 2002 143.6 4.211 2003 141.6 4.437 2004 139.8 4.652 2005 138.1 4.856 2006 136.6 5.049 2007 135.2 5.231 2008 133.8 5.402 2009 132.6 5.562 2010 131.4 5.711 2011 130.3 5.849 2012 129.2 5.977 2013 128.2 6.094 2014 127.2 6.201 2015 126.2 6.298 2016 125.3 6.385 2017 124.4 6.462 2018 123.5 6.529 2019 122.6 6.587 2020 121.8 6.635 2021 120.9 6.674 2022 120.1 6.704 2023 119.2 6.724 2024 118.4 6.736 2025 117.6 6.738 2026 116.7 6.732 2027 115.9 6.717 2028 115.1 6.693 2029 114.2 6.661 2030 113.4 6.620 2031 112.5 6.571 2032 111.7 6.513 2033 110.8 6.447 2034 109.8 6.372 2035 108.9 6.289 2036 107.9 6.198 2037 107.0 6.099 2038 105.9 5.992 2039 104.9 5.877 2040 103.7 5.754 2041 102.6 5.623 2042 101.4 5.484 2043 100.1 5.337 2044 98.7 5.183 2045 97.3 5.022 2046 95.7 4.854 2047 94.1 4.679 2048 92.3 4.497 2049 90.4 4.309 2050 88.3 4.115		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic