00284-2020 B  1909

Coord 2000	00284-2020		Discov num	B  1909		Comp			Coord arcsec 2000	00 28 21.17 -20 20 05.2
Date first	1929		Date last	2015		Obs	88
Pa first	119		Pa last	137		P.A. Now (θ)	248.7°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.09"
Mag pri	7.23		Mag sec	7.40		delta mag (ΔM)	0.17		Spectral class	G0V (yellow)
Pri motion ra	-116		Sec motion ra
Pri motion dec	-114		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	137.2		Precise sep	0.156		Cdsa2 id	B 1909		Constellation	Cetus
SAO	166296		HIP	2237		Tycho2	5846-00959-1		HD	2475
HR	108		BD	BD-21 57		Ra deg	0.47254722222222223		De deg	-20.334777777777777
Distance	32.2		Distance ly	105.04		last precise pa	137.2		last precise sep	0.156

Period (P)	11.35y		Periastron (T)	1995.09y		Semi-major axis (a)	0.202a
Eccentricity (e)	0.005		Inclination (i)	69.8°		Longitude of periastron (ω)	99°
Node (Ω)	119.49°		Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.086 351.6 2001 0.088 69.9 2002 0.157 102.1 2003 0.199 115.8 2004 0.190 127.1 2005 0.133 144.0 2006 0.071 195.0 2007 0.110 265.3 2008 0.176 287.7 2009 0.202 299.8 2010 0.175 311.9 2011 0.109 334.7 2012 0.072 44.8 2013 0.134 94.7 2014 0.190 111.7 2015 0.199 123.0 2016 0.157 136.6 2017 0.087 169.2 2018 0.086 248.7 2019 0.156 282.1 2020 0.199 295.9 2021 0.190 307.2 2022 0.134 324.1 2023 0.073 13.6 2024 0.109 84.0 2025 0.175 107.0 2026 0.202 119.1 2027 0.177 131.0 2028 0.111 153.0 2029 0.071 222.4 2030 0.132 274.5 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
00284-2020	B 1909		1999	71	156	0.1	7.23	7.40	G0V	NOD	002821.17-202005.2
00284-2020	B 1909		2008	77	297	0.2	7.23	7.40	G0V	NOD	002821.17-202005.2
00284-2020	B 1909		2010	80	337	0.1	7.23	7.40	G0V	NOD	002821.17-202005.2
00284-2020	B 1909		2014	83	301	0.2	7.23	7.40	G0V	NO	002821.17-202005.2
00284-2020	B 1909		2015	84	137	0.2	7.23	7.40	G0V	NO	002821.17-202005.2

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