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00491+5749
STF 60AB
Achird

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

00491+5749 STF 60AB (Achird)

00^h 49^m 06.29^s +57° 48' 54.7" P.A. 326.70 sep 13.4 mag 3.52,7.36 Sp G1V+M dist. 5.95 pc (19.41 l.y.)

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	2020		Obs	1084
Pa first	62		Pa last	326		P.A. Now (θ)	326.7°
Sep first	11.3		Sep last	13.6		Sep. Now (ρ)	13.43"
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.

00491+5749 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Achird	21732	00 49 06 +57 48 55	STF 60 AB	2020	1084	327	13.4	3.52	7.36	3.84	Y	<===
Show		21732	00 49 06 +57 48 55	STF 60 AC	2000	4	260	225.0	3.52	11.40	7.88
Show		21732	00 49 06 +57 48 55	STF 60 AD	2011	7	354	189.4	3.52	12.80	9.28
Show		21732	00 49 06 +57 48 55	STF 60 AE	2015	24	126	75.6	3.52	10.15	6.63
Show		21732	00 49 06 +57 48 55	STF 60 AF	2000	3	276	378.3	3.52	11.53	8.01
Show		21732	00 49 06 +57 48 55	STF 60 AG	2012	19	259	419.7	3.52	9.53	6.01
Show		21732	00 49 06 +57 48 55	STF 60 AH	2012	4	355	701.1	3.52	8.41	4.89
Show		21732	00 49 06 +57 48 55	SMR 2 AI	2012	7	73	90.3	3.52	11.60	8.08
Show		21732	00 49 06 +57 48 55	SMR 2 AJ	2012	5	262	237.1	3.52	12.30	8.78
Show		21732	00 49 05 +57 49 04	STF 60 BC	2000	4	257	218.7	7.36	11.40	4.04
Show		21732	00 49 05 +57 49 04	STF 60 BD	2000	1	1	172.2	7.36	12.80	5.44
Show		21732	00 49 05 +57 49 04	STF 60 BE	2020	4	126	105.5	7.36	10.15	2.79
Show		21732	00 49 05 +57 49 04	STF 60 BF	2000	2	275	369.1	7.36	11.53	4.17
Show		21732	00 49 05 +57 49 04	STF 60 BG	2000	2	254	404.0	7.36	9.53	2.17
Show		21732	00 49 05 +57 49 04	STF 60 BH	2020	5	355	688.4	7.36	8.41	1.05
Show			00 48 19 +57 49 34	STF 60 FG	2015	10	188	142.2	11.53	9.53	2.00

Decuple system
10 visible stars in this system

OTHER CATALOGS AND DESIGNATIONS

Precise pa	326.3		Precise sep	13.57		Common name	Achird		Other names	MARFAK
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		Distance	5.95		Distance ly	19.41
last precise pa	326.3		last precise sep	13.57

ORBITAL ELEMENTS

Period (P)	479.27y		Periastron (T)	1889.93y		Semi-major axis (a)	12.04a
Eccentricity (e)	0.497		Inclination (i)	35.6°		Longitude of periastron (ω)	269.8°
Node (Ω)	278°		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

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds00491%2B5749a.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic

WDS HISTORIC DATA

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
00491+5749	STF 60	AB	2018	1079	327	13.5	3.52	7.36	G1V+M	NO P	004906.29+574854.7
00491+5749	STF 60	AB	2019	1081	326	13.4	3.52	7.36	G1V+M	NO P	004906.29+574854.7

If you need more information about this double, apply for a data request form to the WDS.