00569-5153 B  1418 (BW Phe)

Coord 2000	00569-5153		Discov num	B  1418		Comp			Coord arcsec 2000	00 56 55.38 -51 52 32.0
Date first	1928		Date last	2019		Obs	12
Pa first	100		Pa last	317		P.A. Now (θ)	14.1°
Sep first	0.3		Sep last	0.0		Sep. Now (ρ)	0.02"
Mag pri	9.77		Mag sec	10.02		delta mag (ΔM)	0.25		Spectral class	K3/4V (yellow-orange)
Pri motion ra	+096		Sec motion ra
Pri motion dec	-007		Sec motion dec
Notes	O (Orbital solution)

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

Precise pa	317		Precise sep	0.032		Var name	BW Phe		Constellation	Phoenix
SAO	232234		HIP	4448		Tycho2	8037-00492-1		Gaia DR2	33108236416
HD	5578		CP	CP-52 125		Distance	40.63		Distance ly	132.54
last precise pa	317		last precise sep	0.032

Period (P)	19.82y	± 0.54	Periastron (T)	2015.44y	± 0.2	Semi-major axis (a)	0.227a	± 0.012
Eccentricity (e)	0.404	± 0.054	Inclination (i)	85.8°	± 0.6	Longitude of periastron (ω)	323.3°	± 7.3
Node (Ω)	279.8°	± 0.5	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox			Last observation	2018

label rho theta 2000 0.020 342.3 2001 0.054 78.5 2002 0.108 89.3 2003 0.159 92.9 2004 0.203 94.9 2005 0.240 96.1 2006 0.268 97.1 2007 0.286 97.9 2008 0.294 98.7 2009 0.289 99.4 2010 0.270 100.2 2011 0.236 101.2 2012 0.183 102.6 2013 0.111 105.6 2014 0.023 130.5 2015 0.075 273.4 2016 0.137 279.0 2017 0.143 282.0 2018 0.110 285.8 2019 0.060 295.2 2020 0.018 14.1 2021 0.063 81.8 2022 0.118 90.2 2023 0.167 93.3 2024 0.210 95.1 2025 0.246 96.3 2026 0.272 97.3 2027 0.288 98.1 2028 0.294 98.8 2029 0.287 99.5 2030 0.265 100.3 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
00569-5153	B 1418		1991	5	93	0.2	9.77	10.02	K3/4V		005655.38-515232.0
00569-5153	B 1418		2015	7	279	0.1	9.77	10.02	K3/4V		005655.38-515232.0
00569-5153	B 1418		2017	9	284	0.1	9.77	10.02	K3/4V		005655.38-515232.0
00569-5153	B 1418		2018	10	290	0.1	9.77	10.02	K3/4V		005655.38-515232.0
00569-5153	B 1418		2019	12	317	0.0	9.77	10.02	K3/4V	O	005655.38-515232.0

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