00572+2325 MKT   2Aa,Ab

Coord 2000	00572+2325		Discov num	MKT   2		Comp	Aa,Ab		Coord arcsec 2000	00 57 12.43 +23 25 03.9
Date first	1990		Date last	1992		Obs	23
Pa first	157		Pa last	41		P.A. Now (θ)	41°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0"
Mag pri	4.42		Mag sec			delta mag (ΔM)			Spectral class	G8IIIb (yellow)
Pri motion ra	-044		Sec motion ra
Pri motion dec	-045		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

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name

SAO

coord_2000

discov#

comp

first

last

obs

pa

sep

mag1

mag2

d_mag

orb

current

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74388

00572+2325

MKT 2

Aa,Ab

1990

1992

23

41

0.0

4.42

Y

<===

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Eta And

74388

00572+2325

FOX 116

AB

1894

2001

8

232

129.3

4.42

12.34

7.92

Triple system
2 visible stars in this system

Precise pa	40.5		Precise sep	0.01		Cdsa2 id	MKT 2 Aa,Ab		Constellation	Andromeda
SAO	74388		HIP	4463		Tycho2	1740-02109-1		HD	5516
HR	271		GC	1136		BD	BD+22 153		Bayer	Eta Andromedae
Bayer name	Eta And		Flamsteed	38 Andromedae		Flamsteed name	38 And		Ra deg	0.9534527777777777
De deg	23.41775		Distance	70.42		Distance ly	229.71		last precise pa	40.5
last precise sep	0.01

Period (P)	115.72d	± 0.01	Periastron (T)	48013d (1990.331y)	± 1	Semi-major axis (a)	10.37m	± 0.03
Eccentricity (e)	0.006	± 0.002	Inclination (i)	30.5°	± 0.4	Longitude of periastron (ω)	215°	± 4
Node (Ω)	69.4°	± 0.5	Note			Grade	1	(1=Definitive, 9=Indet.)
Equinox			Last observation	1992

label rho theta 2000-01-01 0.010 106.6 2001-01-01 0.009 167.6 2002-01-01 0.010 226.0 2003-01-01 0.010 276.0 2004-01-01 0.009 335.9 2005-01-01 0.010 36.7 2006-01-01 0.010 86.0 2007-01-01 0.009 141.9 2008-01-01 0.010 204.4 2009-01-01 0.010 255.8 2010-01-01 0.009 310.2 2011-01-01 0.009 14.2 2012-01-01 0.010 66.7 2013-01-01 0.010 117.7 2014-01-01 0.009 180.4 2015-01-01 0.010 236.1 2016-01-01 0.010 286.8 2017-01-01 0.009 349.1 2018-01-01 0.010 47.1 2019-01-01 0.010 96.1 2020-01-01 0.009 154.7 2021-01-01 0.010 215.5 2022-01-01 0.010 265.8 2023-01-01 0.009 322.9 2024-01-01 0.010 25.8 2025-01-01 0.010 76.4 2026-01-01 0.009 129.5 2027-01-01 0.009 192.8 2028-01-01 0.010 246.0 2029-01-01 0.009 298.2 2030-01-01 0.009 1.9 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
00572+2325	MKT 2	Aa,Ab	1992	23	41	0.0	4.42		G8IIIb	NO	005712.43+232503.9

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