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Doubles in this session

Current system

00491+5749
STF 60AB
Achird

Nearby doubles

14' : 00490+5802
TDS1629

24' : 00469+5735
TDS1610AB

27' : 00503+5725
STI1442

27' : 00465+5731
MLR 651

30' : 00492+5720
A 921AB

30' : 00522+5805
TDS1646

32' : 00479+5819
TDS1615

35' : 00483+5823
STI1429

37' : 00513+5717
TDS1638

37' : 00472+5716
TDS 29

40' : 00492+5830
J 2385

45' : 00434+5750
MLR 649

47' : 00548+5759
STI1471

48' : 00437+5807
STI1419AB

49' : 00531+5713
ES 552

49' : 00486+5701
STI1432

50' : 00514+5705
ES 1868AB

51' : 00429+5742
A 916

51' : 00429+5738
ES 404

52' : 00533+5711
STI1463AB

52' : 00555+5800
ES 1771

53' : 00557+5748
ES 405

54' : 00426+5736
ES 1806

54' : 00513+5840
GIC 14

55' : 00425+5735
TDS1575

56' : 00450+5833
BKO 138

Selections

Binocular doubles

Quadruple Systems

Multiple Systems

Neglected List I

Neglected List II

Herschel, J.F.W.

00491+5749 STF 60AB (Achird)

00^h 49^m 06.29^s +57° 48' 54.7" P.A. 325 sep 13.32 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	2016		Obs	1069
Pa first	62		Pa last	324		P.A. Now (θ)	325°
Sep first	11.3		Sep last	12.9		Sep. Now (ρ)	13.32"
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_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Achird	21732	00491+5749	STF 60	AB	1779	2016	1069	325	13.3	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

OTHER CATALOGS AND DESIGNATIONS

Precise pa	324.2		Precise sep	12.9		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	324.9		last precise sep	13.37

ORBITAL ELEMENTS

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.

grafico orbita

wds00491%2B5749b.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

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