19487+1504 A  1658

Coord 2000	19487+1504		Discov num	A  1658		Comp			Coord arcsec 2000	19 48 39.64 +15 03 32.4
Date first	1907		Date last	2018		Obs	82
Pa first	161		Pa last	67		P.A. Now (θ)	58.6°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.23"
Mag pri	8.30		Mag sec	8.74		delta mag (ΔM)	0.44		Spectral class	F5V (yellow-white)
Pri motion ra	+044		Sec motion ra
Pri motion dec	+012		Sec motion dec
Notes	N O (See Notes, Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	66.5		Precise sep	0.228		Constellation	Aquila		SAO	105284
HIP	97469		Tycho2	1615-00730-1		Gaia DR2	94259738752		HD	187283
ADS	12961		BD	BD+14 4048		Distance	136.61		Distance ly	445.62
last precise pa	66.5		last precise sep	0.228

Period (P)	88.1y	± 1.3	Periastron (T)	1991.6y	± 1.2	Semi-major axis (a)	0.224a	± 0.001
Eccentricity (e)	0.087	± 0.004	Inclination (i)	169.8°	± 5	Longitude of periastron (ω)	228.2°	± 35
Node (Ω)	51.5°	± 40	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2000

label rho theta 2000 0.205 142.8 2001 0.206 138.1 2002 0.207 133.4 2003 0.208 128.7 2004 0.210 124.1 2005 0.211 119.6 2006 0.213 115.1 2007 0.214 110.7 2008 0.216 106.3 2009 0.217 102.0 2010 0.219 97.8 2011 0.220 93.6 2012 0.222 89.5 2013 0.224 85.5 2014 0.225 81.5 2015 0.227 77.5 2016 0.228 73.7 2017 0.230 69.8 2018 0.231 66.1 2019 0.233 62.3 2020 0.234 58.6 2021 0.235 55.0 2022 0.236 51.3 2023 0.237 47.7 2024 0.238 44.2 2025 0.239 40.6 2026 0.239 37.1 2027 0.240 33.6 2028 0.241 30.1 2029 0.241 26.7 2030 0.241 23.2 Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
19487+1504	A 1658		2000	78	145	0.2	8.30	8.74	F5V	NO	194839.64+150332.4
19487+1504	A 1658		2006	79	115	0.2	8.30	8.74	F5V	NO	194839.64+150332.4
19487+1504	A 1658		2007	82	112	0.2	8.30	8.74	F5V	NO	194839.64+150332.4
19487+1504	A 1658		2015	81	78	0.2	8.30	8.74	F5V	NO	194839.64+150332.4
19487+1504	A 1658		2018	82	67	0.2	8.30	8.74	F5V	NO	194839.64+150332.4

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