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19520-1021
BU 148AB

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

19520-1021 BU 148AB

19^h 52^m 01.89^s -10° 21' 13.5" P.A. 213.60 sep 0.5 mag 7.74,8.41 Sp F2 dist. 86.96 pc (283.66 l.y.)

Coord 2000	19520-1021		Discov num	BU 148		Comp	AB		Coord arcsec 2000	19 52 01.89 -10 21 13.5
Date first	1873		Date last	2018		Obs	72
Pa first	310		Pa last	223		P.A. Now (θ)	213.6°
Sep first	1.0		Sep last	0.6		Sep. Now (ρ)	0.54"
Mag pri	7.74		Mag sec	8.41		delta mag (ΔM)	0.67		Spectral class	F2 (yellow-white)
Pri motion ra	-014		Sec motion ra	-014
Pri motion dec	-049		Sec motion dec	-049
Notes	O (Orbital solution)

This double is physical.

19520-1021 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		163059	19 52 02 -10 21 14	BU 148 AB	2018	72	214	0.5	7.74	8.41	0.67	Y	<===
Show		163059	19 52 02 -10 21 14	BU 148 AC	2014	10	55	31.1	7.74	13.30	5.56

Triple system
3 visible stars in this system

OTHER CATALOGS AND DESIGNATIONS

Precise pa	222.6		Precise sep	0.609		Constellation	Aquila		SAO	163059
HIP	97766		Tycho2	5729-01628-1		Gaia DR2	4190490812075716224		HD	187774
ADS	13028		BD	BD-10 5203		Distance	86.96		Distance ly	283.66
last precise pa	222.6		last precise sep	0.609

ORBITAL ELEMENTS

Period (P)	783.31y		Periastron (T)	2032.84y		Semi-major axis (a)	1.365a
Eccentricity (e)	0.62		Inclination (i)	120.5°		Longitude of periastron (ω)	217.5°
Node (Ω)	38.1°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2002

label	rho	theta
2000	0.613	234.5
2001	0.612	233.6
2002	0.611	232.7
2003	0.609	231.8
2004	0.607	230.9
2005	0.605	229.9
2006	0.603	229.0
2007	0.601	228.1
2008	0.598	227.1
2009	0.596	226.1
2010	0.593	225.2
2011	0.589	224.2
2012	0.586	223.2
2013	0.582	222.2
2014	0.577	221.2
2015	0.573	220.2
2016	0.568	219.1
2017	0.563	218.1
2018	0.558	217.0
2019	0.552	215.9
2020	0.546	214.7
2021	0.539	213.6
2022	0.533	212.4
2023	0.526	211.2
2024	0.518	209.9
2025	0.511	208.6
2026	0.503	207.3
2027	0.494	205.9
2028	0.486	204.5
2029	0.477	203.0
2030	0.468	201.5

grafico orbita

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

wds19520-1021a.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
19520-1021	BU 148	AB	2004	85	231	0.6	7.74	8.41	F2	NOD	195201.89-102113.5
19520-1021	BU 148	AB	2008	86	229	0.6	7.74	8.41	F2	NOD	195201.89-102113.5
19520-1021	BU 148	AB	2009	87	228	0.6	7.74	8.41	F2	NOD	195201.89-102113.5
19520-1021	BU 148	AB	2017	71	223	0.6	7.74	8.41	F2	O	195201.89-102113.5
19520-1021	BU 148	AB	2018	72	223	0.6	7.74	8.41	F2	O	195201.89-102113.5

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