01220-6943 I   263

Coord 2000	01220-6943		Discov num	I   263		Comp			Coord arcsec 2000	01 21 58.64 -69 43 07.6
Date first	1897		Date last	2014		Obs	47
Pa first	52		Pa last	289		P.A. Now (θ)	292.7°
Sep first	0.7		Sep last	0.4		Sep. Now (ρ)	0.39"
Mag pri	7.66		Mag sec	8.61		delta mag (ΔM)	0.95		Spectral class	F3V (yellow-white)
Pri motion ra	-002		Sec motion ra	-002
Pri motion dec	+006		Sec motion dec	+006
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	288.8		Precise sep	0.397		Constellation	Tucana		SAO	248370
HIP	6377		Tycho2	9136-01600-1		HD	8519		CP	CP-70 64
Distance	89.61		Distance ly	292.31		last precise pa	288.8		last precise sep	0.397

Period (P)	272.15y	± 47.48	Periastron (T)	1936.56y	± 5.3	Semi-major axis (a)	0.791a	± 0.075
Eccentricity (e)	0.374	± 0.059	Inclination (i)	68.6°	± 1.9	Longitude of periastron (ω)	297.3°	± 14.1
Node (Ω)	231.3°	± 2.8	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 0.491 266.0 2001 0.484 267.2 2002 0.478 268.4 2003 0.472 269.7 2004 0.466 270.9 2005 0.459 272.2 2006 0.453 273.6 2007 0.447 275.0 2008 0.441 276.4 2009 0.436 277.9 2010 0.430 279.3 2011 0.425 280.9 2012 0.419 282.5 2013 0.414 284.1 2014 0.409 285.7 2015 0.405 287.4 2016 0.400 289.1 2017 0.396 290.9 2018 0.392 292.7 2019 0.388 294.6 2020 0.385 296.4 2021 0.382 298.3 2022 0.379 300.3 2023 0.377 302.2 2024 0.375 304.2 2025 0.373 306.2 2026 0.372 308.2 2027 0.371 310.3 2028 0.370 312.3 2029 0.370 314.4 2030 0.370 316.4 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
01220-6943	I 263		2001	42	267	0.5	7.66	8.61	F3V	NOD	012158.64-694307.6
01220-6943	I 263		2008	45	278	0.4	7.66	8.61	F3V	NOD	012158.64-694307.6
01220-6943	I 263		2009	46	279	0.4	7.66	8.61	F3V	NOD	012158.64-694307.6
01220-6943	I 263		2014	47	289	0.4	7.66	8.61	F3V	NO	012158.64-694307.6

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