19581-4808 HDS2842

Coord 2000	19581-4808		Discov num	HDS2842		Comp			Coord arcsec 2000	19 58 04.28 -48 08 01.2
Date first	1991		Date last	2017		Obs	10
Pa first	92		Pa last	63		P.A. Now (θ)	69.6°
Sep first	0.3		Sep last	0.1		Sep. Now (ρ)	0.13"
Mag pri	8.61		Mag sec	10.78		delta mag (ΔM)	2.17		Spectral class	G0V (yellow)
Pri motion ra	+052		Sec motion ra
Pri motion dec	+016		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

Precise pa	62.8		Precise sep	0.107		Cdsa2 id	HDS 2842		Constellation	Telescopium
HIP	98274		HD	188581		Ra deg	19.967855555555555		De deg	-48.13366666666666
Distance	53.79		Distance ly	175.46		last precise pa	62.8		last precise sep	0.107

Period (P)	35.28y	± 2.48	Periastron (T)	2016.036y	± 0.065	Semi-major axis (a)	0.2364a	± 0.014
Eccentricity (e)	0.738	± 0.037	Inclination (i)	70.2°	± 2.2	Longitude of periastron (ω)	60.6°	± 4.1
Node (Ω)	254.2°	± 2.4	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.217 109.3 2001 0.204 112.2 2002 0.191 115.6 2003 0.177 119.5 2004 0.163 124.0 2005 0.149 129.4 2006 0.135 135.9 2007 0.122 143.9 2008 0.110 153.6 2009 0.101 165.3 2010 0.096 178.8 2011 0.094 193.3 2012 0.096 207.8 2013 0.099 221.4 2014 0.101 234.4 2015 0.089 248.4 2016 0.038 281.7 2017 0.067 55.3 2018 0.132 69.6 2019 0.176 75.1 2020 0.209 78.6 2021 0.232 81.3 2022 0.249 83.5 2023 0.262 85.5 2024 0.270 87.3 2025 0.275 89.1 2026 0.278 90.8 2027 0.278 92.5 2028 0.276 94.2 2029 0.273 95.9 2030 0.267 97.7 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
19581-4808	HDS2842		1991	1	92	0.3	8.61	10.78	G0V		195804.28-480801.2
19581-4808	HDS2842		2009	3	168	0.1	8.61	10.78	G0V		195804.28-480801.2
19581-4808	HDS2842		2014	6	254	0.1	8.61	10.78	G0V	O	195804.28-480801.2
19581-4808	HDS2842		2015	9	268	0.1	8.61	10.78	G0V	O	195804.28-480801.2
19581-4808	HDS2842		2017	10	63	0.1	8.61	10.78	G0V	O	195804.28-480801.2

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