00492+5720 A   921AB

Coord 2000	00492+5720		Discov num	A   921		Comp	AB		Coord arcsec 2000	00 49 09.10 +57 19 37.6
Date first	1905		Date last	2008		Obs	15
Pa first	39		Pa last	2		P.A. Now (θ)	30°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.18"
Mag pri	9.00		Mag sec	9.50		delta mag (ΔM)	0.5		Spectral class	G5 (yellow)
Pri motion ra	+016		Sec motion ra
Pri motion dec	+020		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		21736	00 49 09 +57 19 38	A 921 AB	2008	15	30	0.2	9.00	9.50	0.50	Y	<===
Show		21736	00 49 09 +57 19 38	A 921 AB,C	2000	9	268	4.1	8.60	14.00	5.40

Triple system
4 visible stars in this system

Precise pa	2.1		Precise sep	0.239		Constellation	Cassiopeia		SAO	21736
Tycho2	3663-02675-1		Gaia DR2	423900666397110016		HD	236538		ADS	674
last precise pa	2.1		last precise sep	0.239

Period (P)	120.47y		Periastron (T)	1982.4y		Semi-major axis (a)	0.221a
Eccentricity (e)	0.696		Inclination (i)	59.6°		Longitude of periastron (ω)	96.6°
Node (Ω)	140.3°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2007

label rho theta 2000 0.166 353.6 2001 0.168 355.5 2002 0.169 357.4 2003 0.170 359.3 2004 0.171 1.1 2005 0.172 2.9 2006 0.173 4.6 2007 0.174 6.4 2008 0.175 8.1 2009 0.175 9.9 2010 0.176 11.6 2011 0.176 13.3 2012 0.177 15.0 2013 0.177 16.7 2014 0.178 18.4 2015 0.178 20.1 2016 0.178 21.7 2017 0.179 23.4 2018 0.179 25.0 2019 0.180 26.7 2020 0.180 28.3 2021 0.180 30.0 2022 0.181 31.6 2023 0.181 33.2 2024 0.182 34.8 2025 0.182 36.4 2026 0.182 38.0 2027 0.183 39.6 2028 0.183 41.2 2029 0.184 42.8 2030 0.184 44.3		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
00492+5720	A 921	AB	1996	12	168	0.2	9.00	9.50	G5	NO	004909.10+571937.6
00492+5720	A 921	AB	2007	13	6	0.2	9.00	9.50	G5	NO	004909.10+571937.6
00492+5720	A 921	AB	2008	15	2	0.2	9.00	9.50	G5	NO	004909.10+571937.6

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