01198-0031 FIN 337BC

Coord 2000	01198-0031		Discov num	FIN 337		Comp	BC		Coord arcsec 2000	01 19 48.33 -00 30 31.0
Date first	1958		Date last	2020		Obs	88
Pa first	227		Pa last	5		P.A. Now (θ)	185°
Sep first	0.1		Sep last	0.1		Sep. Now (ρ)	0.09"
Mag pri	7.40		Mag sec	7.60		delta mag (ΔM)	0.2		Spectral class	F5 (yellow-white)
Pri motion ra	+013		Sec motion ra
Pri motion dec	-014		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	42 Cet	129235	01198-0031	STF 113	A,BC	1829	2020	333	22	1.6	6.45	6.99	0.54	Y
Show		129235	01198-0031	FIN 337	BC	1958	2020	88	185	0.1	7.40	7.60	0.20	Y	<===

Triple system
4 visible stars in this system

Precise pa	4.7		Precise sep	0.092		Constellation	Cetus		SAO	129235
HIP	6226		HD	8036		HR	385		GC	1600
ADS	1081		Flamsteed	42 Ceti		Flamsteed name	42 Cet		Distance	100.7
Distance ly	328.48		last precise pa	4.7		last precise sep	0.092

Period (P)	27.028y	± 0.09	Periastron (T)	1995.04y	± 0.13	Semi-major axis (a)	0.10855a	± 0.00071
Eccentricity (e)	0.215	± 0.011	Inclination (i)	16.8°	± 2.8	Longitude of periastron (ω)	13°	± 18
Node (Ω)	194°	± 17	Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.100 298.1 2001 0.106 312.1 2002 0.112 324.6 2003 0.117 335.8 2004 0.122 346.0 2005 0.126 355.6 2006 0.129 4.6 2007 0.131 13.3 2008 0.132 21.8 2009 0.131 30.2 2010 0.130 38.8 2011 0.128 47.7 2012 0.124 56.9 2013 0.120 66.7 2014 0.115 77.3 2015 0.110 88.8 2016 0.105 101.4 2017 0.100 115.4 2018 0.095 130.8 2019 0.091 147.6 2020 0.088 165.8 2021 0.086 185.0 2022 0.085 205.1 2023 0.085 225.4 2024 0.086 245.4 2025 0.089 264.5 2026 0.094 282.0 2027 0.099 297.7 2028 0.105 311.7 2029 0.111 324.2 2030 0.117 335.5		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
01198-0031	FIN 337	BC	2005	68	3	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2008	75	26	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2009	77	32	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2011	79	47	0.1	7.40	7.60	F5	NOD	011948.29-003032.4
01198-0031	FIN 337	BC	2013	80	254	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2014	83	267	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2015	84	280	0.1	7.40	7.60	F5	NO	011948.29-003032.4
01198-0031	FIN 337	BC	2018	85	322	0.1	7.40	7.60	F5	NO	011948.33-003031.0
01198-0031	FIN 337	BC	2019	86	329	0.1	7.40	7.60	F5	NO	011948.33-003031.0

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