19531-2528 B   454

Coord 2000	19531-2528		Discov num	B   454		Comp			Coord arcsec 2000	19 53 08.30 -25 27 41.2
Date first	1926		Date last	2017		Obs	29
Pa first	338		Pa last	337		P.A. Now (θ)	336.5°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.29"
Mag pri	8.71		Mag sec	8.87		delta mag (ΔM)	0.16		Spectral class	F8V (yellow-white)
Pri motion ra	+008		Sec motion ra
Pri motion dec	-037		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	336.8		Precise sep	0.266		Constellation	Sagittarius		SAO	188673
HIP	97851		Tycho2	6895-01740-1		HD	187858		ADS	13048
CD	CD-2514403		CP	CP-25 6930		Distance	89.13		Distance ly	290.74
last precise pa	336.8		last precise sep	0.266

Period (P)	47.21y		Periastron (T)	2006.84y		Semi-major axis (a)	0.196a
Eccentricity (e)	0.764		Inclination (i)	78.8°		Longitude of periastron (ω)	32°
Node (Ω)	153.8°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.086 0.2 2001 0.066 6.7 2002 0.046 19.0 2003 0.030 47.1 2004 0.028 97.8 2005 0.041 131.1 2006 0.052 147.5 2007 0.033 165.2 2008 0.025 303.5 2009 0.073 323.1 2010 0.112 327.5 2011 0.145 329.8 2012 0.173 331.2 2013 0.196 332.3 2014 0.216 333.2 2015 0.234 333.9 2016 0.249 334.5 2017 0.261 335.1 2018 0.272 335.6 2019 0.282 336.1 2020 0.289 336.5 2021 0.295 337.0 2022 0.300 337.4 2023 0.304 337.8 2024 0.306 338.2 2025 0.307 338.6 2026 0.307 338.9 2027 0.306 339.3 2028 0.304 339.7 2029 0.301 340.1 2030 0.297 340.5 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
19531-2528	B 454		1991	25	345	0.2	8.71	8.87	F8V	NO	195308.30-252741.2
19531-2528	B 454		2009	29	324	0.1	8.71	8.87	F8V	NO	195308.30-252741.2
19531-2528	B 454		2014	28	336	0.2	8.71	8.87	F8V	NO	195308.30-252741.2
19531-2528	B 454		2017	29	337	0.3	8.71	8.87	F8V	NO	195308.30-252741.2

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