00106-7313 I    43AB

Coord 2000	00106-7313		Discov num	I    43		Comp	AB		Coord arcsec 2000	00 10 38.56 -73 13 27.7
Date first	1896		Date last	2017		Obs	13
Pa first	340		Pa last	196		P.A. Now (θ)	194.7°
Sep first	0.8		Sep last	0.5		Sep. Now (ρ)	0.54"
Mag pri	6.97		Mag sec	8.55		delta mag (ΔM)	1.58		Spectral class	F2V+F6V (yellow-white/yellow-white)
Pri motion ra	+123		Sec motion ra
Pri motion dec	+020		Sec motion dec
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		255642	00 10 39 -73 13 28	I 43 AB	2017	13	195	0.5	6.97	8.55	1.58	Y	<===
Show		255642	00 10 39 -73 13 28	I 43 AB,C	2015	4	334	30.4	6.70	14.20	7.50

Triple system
4 visible stars in this system

Precise pa	196		Precise sep	0.496		Constellation	Hydra		SAO	255642
HIP	865		Tycho2	9140-00836-1		Gaia DR2	4689416169048411008		HD	661
HR	32		CP	CP-73 4		Distance	70.42		Distance ly	229.71
last precise pa	196		last precise sep	0.496

Period (P)	1637.7y	± 84	Periastron (T)	2187.8y	± 86.3	Semi-major axis (a)	2.762a	± 0.177
Eccentricity (e)	0.487	± 0.036	Inclination (i)	95.6°	± 1.8	Longitude of periastron (ω)	13.9°	± 2.6
Node (Ω)	172.8°	± 5.3	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1996

label rho theta 2000 0.351 210.8 2001 0.359 209.7 2002 0.368 208.6 2003 0.376 207.6 2004 0.384 206.6 2005 0.393 205.6 2006 0.401 204.7 2007 0.410 203.9 2008 0.418 203.0 2009 0.427 202.2 2010 0.436 201.5 2011 0.445 200.7 2012 0.454 200.0 2013 0.463 199.3 2014 0.472 198.7 2015 0.481 198.0 2016 0.490 197.4 2017 0.499 196.9 2018 0.509 196.3 2019 0.518 195.8 2020 0.527 195.2 2021 0.536 194.7 2022 0.546 194.2 2023 0.555 193.8 2024 0.564 193.3 2025 0.574 192.9 2026 0.583 192.4 2027 0.593 192.0 2028 0.602 191.6 2029 0.611 191.2 2030 0.621 190.9		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
00106-7313	I 43	AB	1996	12	215	0.3	6.97	8.55	F2V+F6V	NOD	001038.31-731328.0
00106-7313	I 43	AB	2017	13	196	0.5	6.97	8.55	F2V+F6V	NO	001038.56-731327.7

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