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00491+5749
SMR 2 AI

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

00491+5749 SMR 2 AI

00^h 49^m 06.29^s +57° 48' 54.7" P.A. 73.00 sep 90.3 mag 3.52,11.60 Sp G0V dist. 5.95 pc (19.41 l.y.)

Coord 2000	00491+5749		Discov num	SMR 2		Comp	AI		Coord arcsec 2000	00 49 06.29 +57 48 54.7
Date first	2000		Date last	2012		Obs	7
Pa first	79		Pa last	72.6		P.A. Now (θ)	72.6°
Sep first	102.6		Sep last	90.28		Sep. Now (ρ)	90.28"
Mag pri	3.52		Mag sec	11.60		delta mag (ΔM)	8.08		Spectral class	G0V (yellow)
Pri motion ra	+114		Sec motion ra	+006
Pri motion dec	-057		Sec motion dec	+003
Notes	N (See Notes)

rPM=0.969

This double is not 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	2022	1086	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			00 49 05 +57 49 04	STF 60 BC	2000	4	257	218.7	7.36	11.40	4.04
Show			00 49 05 +57 49 04	STF 60 BD	2000	1	1	172.2	7.36	12.80	5.44
Show			00 49 05 +57 49 04	STF 60 BE	2020	4	126	105.5	7.36	10.15	2.79
Show			00 49 05 +57 49 04	STF 60 BF	2000	2	275	369.1	7.36	11.53	4.17
Show			00 49 05 +57 49 04	STF 60 BG	2000	2	254	404.0	7.36	9.53	2.17
Show			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 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Achird		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		Bayer greek	η Cas

Other names

MARFAK

Meaning

first applied to ? Cassiopeiae in the Skalnate Pleso Atlas of the Heavens published in 1950, but is not known prior to that.