18055+0230 STF 2272 AB (70 Oph)

18^h 05^m 27.37^s +02° 29' 59.3" P.A. 121.00 sep 6.9 mag 4.22,6.17 Sp K0V+K4V dist. 5.08 pc (16.57 l.y.)

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.

18055+0230 SYSTEM COMPONENTS

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

OTHER CATALOGS AND DESIGNATIONS

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

ORBITAL ELEMENTS

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

grafico orbita

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

wds18055%2B0230d.png orbit plot

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