01198-0031 STF 113A,BC (42 Cet)

Coord 2000	01198-0031		Discov num	STF 113		Comp	A,BC		Coord arcsec 2000	01 19 48.30 -00 30 32.5
Date first	1829		Date last	2016		Obs	325
Pa first	331		Pa last	21		P.A. Now (θ)	20.9°
Sep first	1.3		Sep last	1.6		Sep. Now (ρ)	1.64"
Mag pri	6.45		Mag sec	6.99		delta mag (ΔM)	0.54		Spectral class	A2V+G4III (white/yellow)
Pri motion ra	+014		Sec motion ra	+014
Pri motion dec	-016		Sec motion dec	-016
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	2016	325	21	1.6	6.45	6.99	0.54	Y	<===
Show		129235	01198-0031	FIN 337	BC	1958	2015	84	115	0.1	7.40	7.60	0.20	Y

Triple system
4 visible stars in this system

Precise pa	21.4		Precise sep	1.623		Name	42 Cet		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	21.4		last precise sep	1.623

Period (P)	650y		Periastron (T)	1686y		Semi-major axis (a)	1.324a
Eccentricity (e)	0.64		Inclination (i)	43.5°		Longitude of periastron (ω)	106.7°
Node (Ω)	87.2°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2013

label rho theta 2000 1.620 17.4 2001 1.621 17.6 2002 1.623 17.8 2003 1.624 18.0 2004 1.625 18.2 2005 1.626 18.4 2006 1.627 18.7 2007 1.628 18.9 2008 1.629 19.1 2009 1.630 19.3 2010 1.632 19.5 2011 1.633 19.7 2012 1.634 19.9 2013 1.635 20.1 2014 1.636 20.3 2015 1.637 20.5 2016 1.638 20.7 2017 1.639 20.9 2018 1.639 21.1 2019 1.640 21.3 2020 1.641 21.5 2021 1.642 21.7 2022 1.643 21.9 2023 1.644 22.1 2024 1.645 22.3 2025 1.646 22.5 2026 1.647 22.7 2027 1.647 22.9 2028 1.648 23.1 2029 1.649 23.3 2030 1.650 23.5 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	STF 113	A,BC	2010	332	19	1.5	6.45	6.99	A2V+G4III	N D	011948.29-003032.4
01198-0031	STF 113	A,BC	2011	337	20	1.7	6.45	6.99	A2V G4III	N D	011948.29-003032.4
01198-0031	STF 113	A,BC	2013	338	22	1.7	6.45	6.99	A2V G4III	N D	011948.29-003032.4
01198-0031	STF 113	A,BC	2014	323	22	1.7	6.45	6.99	A2V+G4III	NOD	011948.29-003032.4
01198-0031	STF 113	A,BC	2015	324	22	1.6	6.45	6.99	A2V+G4III	NOD	011948.29-003032.4
01198-0031	STF 113	A,BC	2016	325	21	1.6	6.45	6.99	A2V+G4III	NO	011948.30-003032.5

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