00491+5749 STF  60AB (Achird)

Coord 2000	00491+5749		Discov num	STF  60		Comp	AB		Coord arcsec 2000	00 49 06.29 +57 48 54.7
Date first	1779		Date last	2016		Obs	1076
Pa first	62		Pa last	325		P.A. Now (θ)	325.5°
Sep first	11.3		Sep last	13.4		Sep. Now (ρ)	13.35"
Mag pri	3.52		Mag sec	7.36		delta mag (ΔM)	3.84		Spectral class	G1V+M (yellow/red)
Pri motion ra	+114		Sec motion ra	+111
Pri motion dec	-057		Sec motion dec	-049
Notes	N O P (See Notes, Orbital solution, 100-year proper motion)

rPM=0.067 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Achird	21732	00491+5749	STF 60	AB	1779	2016	1076	326	13.4	3.52	7.36	3.84	Y	<===
Show		21732	00491+5749	STF 60	AC	1912	2000	4	260	225.0	3.52	11.40	7.88
Show		21732	00491+5749	STF 60	AD	1912	2011	7	354	189.4	3.52	12.80	9.28
Show		21732	00491+5749	STF 60	AE	1856	2015	24	126	75.6	3.52	10.15	6.63
Show		21732	00491+5749	STF 60	AF	1913	2000	3	276	378.3	3.52	11.53	8.01
Show		21732	00491+5749	STF 60	AG	1852	2012	18	258	426.0	3.52	9.53	6.01
Show		21732	00491+5749	STF 60	AH	1991	2000	3	355	694.7	3.52	8.41	4.89
Show		21732	00491+5749	SMR 2	AI	2000	2012	7	73	90.3	3.52	11.60	8.08
Show		21732	00491+5749	SMR 2	AJ	2000	2012	5	262	237.1	3.52	12.30	8.78
Show		21732	00491+5749	STF 60	BC	1912	2000	4	257	218.7	7.36	11.40	4.04
Show		21732	00491+5749	STF 60	BD	2000	2000	1	1	172.2	7.36	12.80	5.44
Show		21732	00491+5749	STF 60	BE	1913	2000	3	125	106.1	7.36	10.15	2.79
Show		21732	00491+5749	STF 60	BF	1991	2000	2	275	369.1	7.36	11.53	4.17
Show		21732	00491+5749	STF 60	BG	1991	2000	2	254	404.0	7.36	9.53	2.17
Show		21732	00491+5749	STF 60	BH	1928	2000	4	355	684.7	7.36	8.41	1.05
Show			00491+5749	STF 60	FG	1911	2003	6	188	142.4	11.53	9.53	2.00

Decuple system
10 visible stars in this system

Precise pa	324.9		Precise sep	13.37		Common name	Achird		Other names	MARFAK
Cdsa2 id	STF 60 AB		Constellation	Cassiopeia		SAO	21732		HIP	3821
Tycho2	3663-02669-1		HD	4614		HR	219		GC	962
ADS	671		GL	Gl 34A		BD	BD+57 150		Bayer	Eta Cassiopeiae
Bayer name	Eta Cas		Flamsteed	24 Cassiopeiae		Flamsteed name	24 Cas		Ra deg	0.8184138888888889
De deg	57.815194444444444		Distance	5.95		Distance ly	19.41		last precise pa	324.9
last precise sep	13.37

Period (P)	479.27y	± 8.2	Periastron (T)	1889.93y	± 0.18	Semi-major axis (a)	12.04a	± 0.02
Eccentricity (e)	0.497	± 0.006	Inclination (i)	35.6°	± 0.3	Longitude of periastron (ω)	269.8°	± 1
Node (Ω)	278°	± 0.6	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 12.783 317.4 2001 12.819 317.8 2002 12.854 318.3 2003 12.888 318.8 2004 12.922 319.2 2005 12.956 319.7 2006 12.989 320.1 2007 13.022 320.6 2008 13.054 321.1 2009 13.085 321.5 2010 13.117 321.9 2011 13.147 322.4 2012 13.178 322.8 2013 13.208 323.3 2014 13.237 323.7 2015 13.266 324.2 2016 13.295 324.6 2017 13.323 325.0 2018 13.350 325.5 2019 13.378 325.9 2020 13.405 326.3 2021 13.431 326.7 2022 13.457 327.2 2023 13.483 327.6 2024 13.509 328.0 2025 13.534 328.4 2026 13.558 328.9 2027 13.582 329.3 2028 13.606 329.7 2029 13.630 330.1 2030 13.653 330.5 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
00491+5749	STF 60	AB	2007	1033	320	13.0	3.52	7.36	G0V dM0	NODP	004905.10+574859.6
00491+5749	STF 60	AB	2008	1036	323	13.0	3.52	7.36	G0V dM0	NODP	004905.10+574859.6
00491+5749	STF 60	AB	2009	1043	322	13.1	3.52	7.36	G0V dM0	NODP	004905.10+574859.6
00491+5749	STF 60	AB	2010	1044	322	13.2	3.52	7.36	G0V dM0	NODP	004905.10+574859.6
00491+5749	STF 60	AB	2011	1045	321	13.2	3.52	7.36	G0V dM0	NODP	004905.10+574859.6
00491+5749	STF 60	AB	2013	1056	324	13.3	3.52	7.36	G0V dM0	NODP	004905.14+574859.4
00491+5749	STF 60	AB	2014	1061	324	12.8	3.52	7.36	G1V+M	NODP	004905.14+574859.4
00491+5749	STF 60	AB	2015	1063	325	13.7	3.52	7.36	G1V+M	NO P	004905.14+574859.4
00491+5749	STF 60	AB	2016	1069	324	12.9	3.52	7.36	G1V+M	NO P	004906.29+574854.7

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