00308+4732 BU  394AB

Coord 2000	00308+4732		Discov num	BU  394		Comp	AB		Coord arcsec 2000	00 30 45.56 +47 31 47.5
Date first	1876		Date last	2017		Obs	61
Pa first	278		Pa last	278		P.A. Now (θ)	278.2°
Sep first	0.8		Sep last	0.8		Sep. Now (ρ)	0.9"
Mag pri	8.49		Mag sec	8.77		delta mag (ΔM)	0.28		Spectral class	G0 (yellow)
Pri motion ra	+005		Sec motion ra
Pri motion dec	-056		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		36427	00 30 46 +47 31 48	BU 394 AB	2017	61	278	0.9	8.49	8.77	0.28	Y	<===
Show		36427	00 30 46 +47 31 48	TOK 223 AC	2015	10	201	105.5	8.49	10.95	2.46

Triple system
3 visible stars in this system

Precise pa	278.2		Precise sep	0.84		Constellation	Hydra		SAO	36427
HIP	2414		Tycho2	3252-02035-1		Gaia DR2	390973763472251392		HD	2675
ADS	416		BD	BD+46 95		Distance	49.33		Distance ly	160.91
last precise pa	278.2		last precise sep	0.84

Period (P)	142.14y		Periastron (T)	1992.37y		Semi-major axis (a)	0.689a
Eccentricity (e)	0.847		Inclination (i)	78°		Longitude of periastron (ω)	2°
Node (Ω)	102.1°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1991

label rho theta 2000 0.282 268.7 2001 0.325 270.1 2002 0.366 271.2 2003 0.405 272.1 2004 0.443 272.9 2005 0.479 273.5 2006 0.513 274.0 2007 0.546 274.5 2008 0.578 274.9 2009 0.608 275.3 2010 0.637 275.7 2011 0.666 276.0 2012 0.693 276.3 2013 0.719 276.5 2014 0.745 276.8 2015 0.769 277.0 2016 0.793 277.2 2017 0.816 277.4 2018 0.838 277.6 2019 0.859 277.8 2020 0.880 278.0 2021 0.900 278.2 2022 0.919 278.3 2023 0.938 278.5 2024 0.956 278.6 2025 0.973 278.8 2026 0.990 278.9 2027 1.006 279.0 2028 1.022 279.2 2029 1.037 279.3 2030 1.051 279.4		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
00308+4732	BU 394	AB	2012	52	277	0.7	8.49	8.77	G0	O	003045.56+473147.5
00308+4732	BU 394	AB	2015	54	278	0.8	8.49	8.77	G0	O	003045.56+473147.5
00308+4732	BU 394	AB	2016	55	279	0.8	8.49	8.77	G0	O	003045.56+473147.5
00308+4732	BU 394	AB	2017	59	278	0.8	8.49	8.77	G0	O	003045.56+473147.5
00308+4732	BU 394	AB	2018	62	279	0.8	8.49	8.77	G0	O	003045.56+473147.5

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