00121-5832 RST4739

Coord 2000	00121-5832		Discov num	RST4739		Comp			Coord arcsec 2000	00 12 05.19 -58 31 29.3
Date first	1942		Date last	2019		Obs	12
Pa first	283		Pa last	270		P.A. Now (θ)	267.2°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.25"
Mag pri	8.44		Mag sec	8.61		delta mag (ΔM)	0.17		Spectral class	G5IV/V (yellow)
Pri motion ra	+066		Sec motion ra
Pri motion dec	-156		Sec motion dec
Notes	O (Orbital solution)

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

Precise pa	269.6		Precise sep	0.256		Constellation	Tucana		SAO	231967
HIP	975		Tycho2	8470-00653-1		HD	791		CP	CP-59 10
Distance	59.38		Distance ly	193.7		last precise pa	269.6		last precise sep	0.256

Period (P)	38.23y		Periastron (T)	2027.97y		Semi-major axis (a)	0.226a
Eccentricity (e)	0.551		Inclination (i)	155.6°		Longitude of periastron (ω)	275.8°
Node (Ω)	50.1°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2018

label rho theta 2000 0.273 349.0 2001 0.283 344.3 2002 0.292 339.9 2003 0.299 335.7 2004 0.305 331.7 2005 0.310 327.8 2006 0.314 324.1 2007 0.317 320.4 2008 0.319 316.8 2009 0.320 313.2 2010 0.319 309.6 2011 0.318 306.0 2012 0.315 302.4 2013 0.312 298.7 2014 0.307 294.9 2015 0.301 290.9 2016 0.294 286.8 2017 0.285 282.4 2018 0.275 277.8 2019 0.263 272.7 2020 0.250 267.2 2021 0.235 261.0 2022 0.218 253.8 2023 0.198 245.3 2024 0.176 234.9 2025 0.151 221.1 2026 0.125 201.8 2027 0.102 172.7 2028 0.093 132.5 2029 0.105 93.6 2030 0.128 66.2 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
00121-5832	RST4739		1991	5	259	0.1	8.44	8.61	G5IV/V		001205.19-583129.3
00121-5832	RST4739		2008	7	134	0.3	8.44	8.61	G5IV/V		001205.19-583129.3
00121-5832	RST4739		2015	8	288	0.3	8.44	8.61	G5IV/V		001205.19-583129.3
00121-5832	RST4739		2017	10	279	0.3	8.44	8.61	G5IV/V		001205.19-583129.3
00121-5832	RST4739		2018	11	275	0.3	8.44	8.61	G5IV/V		001205.19-583129.3
00121-5832	RST4739		2019	12	270	0.3	8.44	8.61	G5IV/V	O	001205.19-583129.3

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