11363+2747 STF 1555 AB

Coord 2000	11363+2747		Discov num	STF1555		Comp	AB		Coord arcsec 2000	11 36 17.94 +27 46 52.7
Date first	1829		Date last	2022		Obs	303
Pa first	339		Pa last	151.3		P.A. Now (θ)	151.3°
Sep first	1.3		Sep last	0.66		Sep. Now (ρ)	0.66"
Mag pri	6.41		Mag sec	6.78		delta mag (ΔM)	0.37		Spectral class	F0V (yellow-white)
Pri motion ra	+027		Sec motion ra	+027
Pri motion dec	+013		Sec motion dec	+013
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		81893	11 36 18 +27 46 53	STF 1555 AB	2022	303	151	0.7	6.41	6.78	0.37	Y	<===
Show	HD 100808	81893	11 36 18 +27 46 53	HJ 503 AB,C	2016	55	156	22.5	5.83	11.17	5.34

Triple system
4 estimated visually detectable stars in this system

Constellation	Leo		SAO	81893		HIP	56601		Tycho2	1984-02611-1
HD	100808		HR	4465		GC	15905		ADS	8231
BD	BD+28 2022		Distance	71.58		Distance ly	233.49

Period (P)	1730y		Periastron (T)	2023.2y		Semi-major axis (a)	3.042a
Eccentricity (e)	0.778		Inclination (i)	86.1°		Longitude of periastron (ω)	22.4°
Node (Ω)	149.8°		Notes	n		Reference	Doc2017a
Equinox	2000		Last observation	2015		Grade	4	(1=Definitive, 9=Indet.)

label theta rho 2000 147.4 0.703 2001 147.6 0.707 2002 147.8 0.710 2003 147.9 0.712 2004 148.1 0.714 2005 148.2 0.716 2006 148.4 0.717 2007 148.6 0.717 2008 148.7 0.717 2009 148.9 0.716 2010 149.1 0.715 2011 149.2 0.712 2012 149.4 0.709 2013 149.5 0.706 2014 149.7 0.701 2015 149.9 0.696 2016 150.0 0.690 2017 150.2 0.683 2018 150.4 0.676 2019 150.6 0.668 2020 150.8 0.659 2021 151.0 0.649 2022 151.2 0.638 2023 151.4 0.627 2024 151.6 0.615 2025 151.8 0.602 2026 152.0 0.589 2027 152.3 0.574 2028 152.5 0.559 2029 152.8 0.544 2030 153.1 0.528		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic