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	2019		Obs	119
Pa first	254		Pa last	198		P.A. Now (θ)	198.8°
Sep first	3.0		Sep last	0.8		Sep. Now (ρ)	0.82"
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)

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

Precise pa	197.9		Precise sep	0.822		Name	Tau Scl		Constellation	Sculptor
SAO	193201		HIP	7463		Tycho2	6428-02436-1		Gaia DR2	91741784064
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	197.9		last precise sep	0.822

Period (P)	679.9164y	± 280.5184	Periastron (T)	2049.609y	± 11.3345	Semi-major axis (a)	2.73159a	± 0.85307
Eccentricity (e)	0.75614	± 0.17019	Inclination (i)	67.832°	± 9.489	Longitude of periastron (ω)	220.95°	± 28.609
Node (Ω)	50.738°	± 8.08	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label rho theta 2000 0.783 167.7 2001 0.782 169.3 2002 0.781 170.9 2003 0.781 172.5 2004 0.781 174.1 2005 0.781 175.7 2006 0.782 177.3 2007 0.783 178.9 2008 0.785 180.4 2009 0.786 182.0 2010 0.788 183.6 2011 0.791 185.2 2012 0.793 186.7 2013 0.796 188.3 2014 0.799 189.8 2015 0.802 191.3 2016 0.805 192.8 2017 0.808 194.3 2018 0.812 195.8 2019 0.815 197.3 2020 0.819 198.8 2021 0.822 200.2 2022 0.825 201.6 2023 0.828 203.1 2024 0.831 204.5 2025 0.834 205.9 2026 0.836 207.3 2027 0.838 208.7 2028 0.839 210.1 2029 0.840 211.5 2030 0.840 212.8 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
01361-2954	HJ 3447		2016	116	195	0.8	5.97	7.35	F2V	NO	013608.50-295426.5
01361-2954	HJ 3447		2018	118	197	0.8	5.97	7.35	F2V	NO	013608.50-295426.5
01361-2954	HJ 3447		2019	119	198	0.8	5.97	7.35	F2V	NO	013608.50-295426.5

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