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17156-1018
BU 957

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

17156-1018 BU 957

17^h 15^m 34.66^s -10° 17' 50.9" P.A. 37.30 sep 0.1 mag 7.51,9.69 Sp F5V dist. 108.11 pc (352.65 l.y.)

Coord 2000	17156-1018		Discov num	BU 957		Comp			Coord arcsec 2000	17 15 34.66 -10 17 50.9
Date first	1880		Date last	2020		Obs	51
Pa first	24		Pa last	67		P.A. Now (θ)	37.3°
Sep first	0.6		Sep last	0.1		Sep. Now (ρ)	0.1"
Mag pri	7.51		Mag sec	9.69		delta mag (ΔM)	2.18		Spectral class	F5V (yellow-white)
Pri motion ra	-009		Sec motion ra	-009
Pri motion dec	+022		Sec motion dec	+022
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	67		Precise sep	0.066		Constellation	Ophiuchus		SAO	160405
HIP	84423		Tycho2	5649-00247-1		Gaia DR2	4143224834422302336		HD	156023
ADS	10421		BD	BD-10 4462		Distance	108.11		Distance ly	352.65
last precise pa	67		last precise sep	0.066

ORBITAL ELEMENTS

Period (P)	90.33y	± 1.52	Periastron (T)	1934.61y	± 2.41	Semi-major axis (a)	0.296a	± 0.013
Eccentricity (e)	0.554	± 0.067	Inclination (i)	102°	± 4.6	Longitude of periastron (ω)	7°	± 11.3
Node (Ω)	23°	± 2.1	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label	rho	theta
2000	0.312	193.8
2001	0.299	193.1
2002	0.284	192.4
2003	0.270	191.6
2004	0.254	190.8
2005	0.238	189.8
2006	0.222	188.6
2007	0.205	187.3
2008	0.187	185.7
2009	0.169	183.8
2010	0.150	181.4
2011	0.131	178.3
2012	0.111	174.2
2013	0.092	168.3
2014	0.074	159.4
2015	0.058	145.2
2016	0.047	122.6
2017	0.046	93.9
2018	0.055	69.7
2019	0.070	54.0
2020	0.087	44.0
2021	0.103	37.3
2022	0.117	32.4
2023	0.128	28.3
2024	0.132	24.8
2025	0.131	21.3
2026	0.123	17.6
2027	0.109	13.1
2028	0.091	7.0
2029	0.071	357.7
2030	0.053	341.4

grafico orbita

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

wds17156-1018a.png orbit plot

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

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
17156-1018	BU 957		1999	44	184	0.3	7.51	9.69	F5V	NOD	171534.66-101750.9
17156-1018	BU 957		2009	45	180	0.1	7.51	9.69	F5V	NOD	171534.66-101750.9
17156-1018	BU 957		2013	46	165	0.1	7.51	9.69	F5V	NO	171534.66-101750.9
17156-1018	BU 957		2014	46	159	0.1	7.51	9.69	F5V	NO	171534.66-101750.9
17156-1018	BU 957		2017	47	116	0.1	7.51	9.69	F5V	NO	171534.66-101750.9
17156-1018	BU 957		2018	49	94	0.1	7.51	9.69	F5V	NO	171534.66-101750.9
17156-1018	BU 957		2019	50	77	0.1	7.51	9.69	F5V	NO	171534.66-101750.9

If you need more information about this double, apply for a data request form to the WDS.