01213+1132 BU 4 AB (HD 8187)

Coord 2000	01213+1132		Discov num	BU    4		Comp	AB		Coord arcsec 2000	01 21 19.23 +11 32 12.3
Date first	1872		Date last	2018		Obs	98
Pa first	100		Pa last	113.8		P.A. Now (θ)	113.8°
Sep first	0.5		Sep last	0.639		Sep. Now (ρ)	0.639"
Mag pri	7.12		Mag sec	8.86		delta mag (ΔM)	1.74		Spectral class	F1III (yellow-white)
Pri motion ra	+060		Sec motion ra	+060
Pri motion dec	+001		Sec motion dec	+001
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 8187	92388	01 21 19 +11 32 12	BU 4 AB	2018	98	114	0.6	7.12	8.86	1.74	Y	<===
Show		92388	01 21 19 +11 32 12	BU 4 AC	2015	8	250	29.3	7.12	13.60	6.48

Triple system
3 estimated visually detectable stars in this system

Name	HD 8187		Constellation	Pisces		SAO	92388		HIP	6334
Tycho2	0616-00939-1		Gaia DR2	2586478199560585344		HD	8187		GC	1634
ADS	1097		BD	BD+10 168		Distance	206.61		Distance ly	673.96

Period (P)	291.05y		Periastron (T)	1942.93y		Semi-major axis (a)	0.43a
Eccentricity (e)	0.89		Inclination (i)	141°		Longitude of periastron (ω)	242.8°
Node (Ω)	149.8°		Notes	n		Reference	Sca2015b
Equinox	2000		Last observation	2008		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 111.2 0.535 2001 110.9 0.539 2002 110.7 0.543 2003 110.4 0.547 2004 110.1 0.551 2005 109.9 0.555 2006 109.6 0.558 2007 109.3 0.562 2008 109.1 0.565 2009 108.8 0.569 2010 108.6 0.572 2011 108.3 0.575 2012 108.1 0.579 2013 107.8 0.582 2014 107.6 0.585 2015 107.4 0.588 2016 107.1 0.591 2017 106.9 0.594 2018 106.7 0.597 2019 106.5 0.600 2020 106.2 0.602 2021 106.0 0.605 2022 105.8 0.608 2023 105.6 0.610 2024 105.3 0.613 2025 105.1 0.615 2026 104.9 0.618 2027 104.7 0.620 2028 104.5 0.622 2029 104.3 0.624 2030 104.1 0.627		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic