20081-3929 RST2134

Coord 2000	20081-3929		Discov num	RST2134		Comp			Coord arcsec 2000	20 08 08.89 -39 29 29.6
Date first	1932		Date last	2018		Obs	9
Pa first	137		Pa last	50		P.A. Now (θ)	46.4°
Sep first	0.2		Sep last	0.3		Sep. Now (ρ)	0.26"
Mag pri	10.49		Mag sec	10.90		delta mag (ΔM)	0.41		Spectral class	G0+G0 (yellow/yellow)
Pri motion ra	-014		Sec motion ra
Pri motion dec	+010		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	49.6		Precise sep	0.251		Constellation	Sagittarius		HIP	99185
Tycho2	7951-00440-1		Gaia DR2	12872066304		HD	190759		CD	CD-3913627
CP	CP-39 8624		Distance	136.24		Distance ly	444.41		last precise pa	49.6
last precise sep	0.251

Period (P)	151.79y	± 5	Periastron (T)	1977.23y	± 0.75	Semi-major axis (a)	0.259a	± 0.008
Eccentricity (e)	0.258	± 0.03	Inclination (i)	133.1°	± 3	Longitude of periastron (ω)	198.9°	± 5
Node (Ω)	22.2°	± 3	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2015

label rho theta 2000 0.163 96.1 2001 0.167 92.3 2002 0.171 88.6 2003 0.175 85.1 2004 0.180 81.8 2005 0.185 78.6 2006 0.190 75.6 2007 0.196 72.8 2008 0.201 70.1 2009 0.206 67.6 2010 0.212 65.2 2011 0.217 62.9 2012 0.223 60.7 2013 0.228 58.7 2014 0.233 56.7 2015 0.238 54.8 2016 0.244 53.0 2017 0.249 51.2 2018 0.253 49.6 2019 0.258 48.0 2020 0.263 46.4 2021 0.267 44.9 2022 0.272 43.5 2023 0.276 42.1 2024 0.280 40.7 2025 0.284 39.4 2026 0.287 38.1 2027 0.291 36.9 2028 0.294 35.6 2029 0.297 34.4 2030 0.300 33.3 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
20081-3929	RST2134		1991	7	136	0.2	10.49	10.90	G0V	NO	200808.89-392929.6
20081-3929	RST2134		2015	8	53	0.2	10.49	10.90	G0V	O	200808.89-392929.6
20081-3929	RST2134		2018	9	50	0.3	10.49	10.90	G0+G0	NO	200808.89-392929.6

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