01361-2954 HJ 3447 (Tau Scl)

Coord 2000	01361-2954		Discov num	HJ 3447		Comp			Coord arcsec 2000	01 36 08.50 -29 54 26.5
Date first	1835		Date last	2015		Obs	115
Pa first	254		Pa last	194		P.A. Now (θ)	198.3°
Sep first	3.0		Sep last	0.8		Sep. Now (ρ)	0.86"
Mag pri	5.97		Mag sec	7.35		delta mag (ΔM)	1.38		Spectral class	F2V (yellow-white)
Pri motion ra	+105		Sec motion ra	+105
Pri motion dec	+038		Sec motion dec	+038
Notes	N O (See Notes, Orbital solution)

This double is physical.

Name	Tau Scl		Constellation	Sculptor		SAO	193201		HIP	7463
Tycho2	6428-02436-1		HD	9906		HR	462		GC	1947
CD	CD-30 540		CP	CP-30 186		Bayer	Tau Sculptoris		Bayer name	Tau Scl
Distance	69.35		Distance ly	226.22		last precise pa	193.6		last precise sep	0.817

Period (P)	1503.58y	± 35.32	Periastron (T)	2039.79y	± 33.8	Semi-major axis (a)	3.155a	± 0.132
Eccentricity (e)	0.604	± 0.019	Inclination (i)	55.6°	± 0.8	Longitude of periastron (ω)	140.2°	± 2.8
Node (Ω)	69.6°	± 0.8	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2001

label rho theta 2000 0.800 169.2 2001 0.799 170.9 2002 0.798 172.6 2003 0.798 174.3 2004 0.799 175.9 2005 0.800 177.6 2006 0.801 179.3 2007 0.803 181.0 2008 0.806 182.6 2009 0.809 184.3 2010 0.812 185.9 2011 0.816 187.5 2012 0.821 189.1 2013 0.826 190.7 2014 0.831 192.3 2015 0.837 193.8 2016 0.843 195.3 2017 0.849 196.8 2018 0.856 198.3 2019 0.863 199.8 2020 0.871 201.2 2021 0.879 202.6 2022 0.887 204.0 2023 0.895 205.3 2024 0.904 206.6 2025 0.913 207.9 2026 0.922 209.2 2027 0.931 210.5 2028 0.941 211.7 2029 0.950 212.9 2030 0.960 214.1 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
01361-2954	HJ 3447		2007	99	180	0.8	5.97	7.35	F2V	NOD	013608.50-295426.5
01361-2954	HJ 3447		2008	103	182	0.8	5.97	7.35	F2V	NOD	013608.50-295426.5
01361-2954	HJ 3447		2010	105	185	0.8	5.97	7.35	F2V	NOD	013608.50-295426.5
01361-2954	HJ 3447		2011	109	185	0.8	5.97	7.35	F2V	NOD	013608.50-295426.5
01361-2954	HJ 3447		2015	113	191	0.8	5.97	7.35	F2V	NO	013608.50-295426.5

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