18465-0058 MCA 53 Aa,Ab

18^h 46^m 28.58^s -00° 57' 41.9" P.A. 95.00 sep 0.0 mag 5.88,6.80 Sp A2V dist. 111.86 pc (364.89 l.y.)

Coord 2000	18465-0058		Discov num	MCA 53		Comp	Aa,Ab		Coord arcsec 2000	18 46 28.58 -00 57 41.9
Date first	1980		Date last	2014		Obs	8
Pa first	8		Pa last	95.3		P.A. Now (θ)	95.3°
Sep first	0.1		Sep last	0.027		Sep. Now (ρ)	0.027"
Mag pri	5.88		Mag sec	6.80		delta mag (ΔM)	0.92		Spectral class	A2V (white)
Pri motion ra	+023		Sec motion ra
Pri motion dec	-023		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

18465-0058 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		142606	18 46 29 -00 57 42	MCA 53 Aa,Ab	2014	8	95	0.0	5.88	6.80	0.92	Y	<===
Show	5 Aql	142606	18 46 29 -00 57 42	STF 2379 AB	2019	118	121	12.5	5.88	7.02	1.14
Show		142606	18 46 29 -00 57 42	STF 2379 AC	2017	16	155	21.8	5.88	11.30	5.42
Show			18 46 29 -00 57 48	STF 2379 BC	2017	14	172	13.4	7.02	11.30	4.28

Quadruple system
3 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Aquila		SAO	142606		HIP	92117		Tycho2	5114-02267-1
HD	173654		HR	7059		GC	25713		ADS	11667
BD	BD-01 3559		Flamsteed	5 Aquilae		Flamsteed name	5 Aql		Distance	111.86
Distance ly	364.89

ORBITAL ELEMENTS

Period (P)	41.28y		Periastron (T)	2012.5y		Semi-major axis (a)	0.103a
Eccentricity (e)	0.666		Inclination (i)	127.3°		Longitude of periastron (ω)	358°
Node (Ω)	164.8°		Notes	n		Reference	Doc2017f
Equinox	2000		Last observation	2014		Grade	4	(1=Definitive, 9=Indet.)

label	theta	rho
2000	333.2	0.147
2001	331.2	0.140
2002	329.0	0.133
2003	326.4	0.124
2004	323.5	0.114
2005	319.9	0.103
2006	315.5	0.091
2007	309.7	0.078
2008	301.4	0.064
2009	288.4	0.050
2010	265.6	0.037
2011	226.9	0.031
2012	184.2	0.033
2013	148.2	0.034
2014	108.2	0.032
2015	70.5	0.037
2016	46.7	0.048
2017	32.8	0.062
2018	23.9	0.076
2019	17.6	0.088
2020	12.9	0.100
2021	9.2	0.111
2022	6.1	0.121
2023	3.4	0.130
2024	1.1	0.138
2025	359.0	0.145
2026	357.1	0.151
2027	355.3	0.156
2028	353.7	0.161
2029	352.1	0.164
2030	350.6	0.167

grafico orbita

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

wds18465-0058c.png orbit plot

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