20154+6412 MLR  60AB

Coord 2000	20154+6412		Discov num	MLR  60		Comp	AB		Coord arcsec 2000	20 15 21.50 +64 11 55.6
Date first	1970		Date last	2008		Obs	24
Pa first	20		Pa last	173		P.A. Now (θ)	28.8°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.12"
Mag pri	8.46		Mag sec	8.50		delta mag (ΔM)	0.04		Spectral class	G5 (yellow)
Pri motion ra	+178		Sec motion ra
Pri motion dec	+232		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		18780	20154+6412	MLR 60	AB	1970	2008	24	29	0.1	8.46	8.50	0.04	Y	<===
Show		18780	20154+6412	LDS5245	AC	1960	1960	1	122	20.0	8.46	17.03	8.57
Show		18780	20154+6412	SHY 772	AD	1991	1999	3	246	999.9	8.46	10.12	1.66

Quadruple system
4 visible stars in this system

Precise pa	173.2		Precise sep	0.249		Constellation	Draco		SAO	18780
HIP	99832		Tycho2	4240-00516-1		Gaia DR2	34213430272		HD	193215
BD	BD+63 1608		Distance	68.97		Distance ly	224.98		last precise pa	173.2
last precise sep	0.249

Period (P)	50y		Periastron (T)	1963.9y		Semi-major axis (a)	0.239a
Eccentricity (e)	0.035		Inclination (i)	107.5°		Longitude of periastron (ω)	68.2°
Node (Ω)	176°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2008

label rho theta 2000 0.200 188.2 2001 0.213 185.3 2002 0.224 182.8 2003 0.231 180.4 2004 0.235 178.1 2005 0.236 175.9 2006 0.233 173.6 2007 0.226 171.3 2008 0.216 168.8 2009 0.203 165.9 2010 0.187 162.7 2011 0.169 158.8 2012 0.148 153.9 2013 0.127 147.3 2014 0.105 138.0 2015 0.086 124.2 2016 0.073 104.0 2017 0.070 79.0 2018 0.079 56.2 2019 0.096 39.8 2020 0.117 28.8 2021 0.139 21.2 2022 0.160 15.7 2023 0.180 11.4 2024 0.198 8.0 2025 0.213 5.0 2026 0.225 2.5 2027 0.234 0.1 2028 0.240 357.9 2029 0.242 355.8 2030 0.241 353.7 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
20154+6412	MLR 60	AB	1997	21	349	0.2	8.46	8.50	G5	O	201521.50+641153.5
20154+6412	MLR 60	AB	2007	22	349	0.2	8.46	8.50	G5	O	201521.50+641153.5
20154+6412	MLR 60	AB	2008	24	173	0.2	8.46	8.50	G5	NOD	201521.50+641153.5

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