11319-3436 ZUC 1 Aa,Ab

Coord 2000	11319-3436		Discov num	ZUC   1		Comp	Aa,Ab		Coord arcsec 2000	11 31 55.26 -34 36 27.4
Date first	2000		Date last	2013		Obs	17
Pa first	26		Pa last	18.3		P.A. Now (θ)	33.8°
Sep first	0.1		Sep last	0.043		Sep. Now (ρ)	0.049"
Mag pri	8.46		Mag sec	8.39		delta mag (ΔM)	0.07		Spectral class	M2Ve (red)
Pri motion ra	-082		Sec motion ra
Pri motion dec	-029		Sec motion dec
Notes	N O K (See Notes, Orbital solution, K-band or other infrared magnitudes)

Visually invisible, K-band or other infrared star : Summary line gives K-band or other infrared (>1 micron) magnitudes This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			11 31 55 -34 36 27	ZUC 1 Aa,Ab	2013	17	18	0.0	8.46	8.39	0.07	Y	<===
Show			11 31 55 -34 36 27	LWR 2 AB	2018	20	352	1.8	7.70	12.60	4.90	Y

Triple system
2 estimated visually detectable stars in this system

Constellation

Hydra

Gaia DR2

5398663566249861120

Period (P)	6.0296y	± 0.0388	Periastron (T)	2004.4024y	± 0.0802	Semi-major axis (a)	0.07113a	± 0.00821
Eccentricity (e)	0.81079	± 0.0491	Inclination (i)	96.981°	± 1.367	Longitude of periastron (ω)	255.72°	± 2.847
Node (Ω)	37.887°	± 1.022	Notes	n		Reference	Izm2019
Equinox			Last observation	2013		Grade	2	(1=Definitive, 9=Indet.)

label theta rho 2000 26.3 0.057 2001 17.9 0.043 2002 355.7 0.022 2003 268.4 0.016 2004 226.7 0.030 2005 33.1 0.052 2006 26.5 0.057 2007 18.2 0.043 2008 356.9 0.023 2009 270.9 0.016 2010 227.4 0.030 2011 33.3 0.051 2012 26.7 0.058 2013 18.5 0.044 2014 358.1 0.024 2015 273.6 0.015 2016 228.1 0.030 2017 33.6 0.050 2018 26.9 0.058 2019 18.9 0.045 2020 359.2 0.024 2021 276.4 0.015 2022 228.8 0.030 2023 33.8 0.049 2024 27.1 0.058 2025 19.2 0.045 2026 0.2 0.025 2027 279.3 0.015 2028 229.5 0.030 2029 34.1 0.048 2030 27.3 0.058		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic