00055+3406 HU 1201 AB (HD 39)

Coord 2000	00055+3406		Discov num	HU 1201		Comp	AB		Coord arcsec 2000	00 05 29.06 +34 06 20.4
Date first	1904		Date last	2014		Obs	36
Pa first	310		Pa last	310.6		P.A. Now (θ)	304.5°
Sep first	0.2		Sep last	0.147		Sep. Now (ρ)	0.057"
Mag pri	8.20		Mag sec	9.76		delta mag (ΔM)	1.56		Spectral class	F8 (yellow-white)
Pri motion ra	-015		Sec motion ra
Pri motion dec	+026		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	HD 39	53635	00 05 29 +34 06 20	HU 1201 AB	2014	36	311	0.1	8.20	9.76	1.56	Y	<===
Show		53635	00 05 29 +34 06 20	HO 490 AC	2015	12	163	25.3	8.20	13.40	5.20

Triple system
3 estimated visually detectable stars in this system

Name	HD 39		Constellation	Andromeda		SAO	53635		HIP	461
Tycho2	2267-01706-1		Gaia DR2	2874421366954299904		HD	39		ADS	51
BD	BD+33 4832		Distance	97.09		Distance ly	316.71

Period (P)	47.06y		Periastron (T)	1983.89y		Semi-major axis (a)	0.138a
Eccentricity (e)	0.651		Inclination (i)	91.5°		Longitude of periastron (ω)	23.9°
Node (Ω)	128.1°		Notes	n		Reference	Zir2003
Equinox	2000		Last observation	1998		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 307.9 0.210 2001 307.8 0.212 2002 307.8 0.214 2003 307.7 0.215 2004 307.7 0.215 2005 307.6 0.214 2006 307.5 0.212 2007 307.5 0.210 2008 307.4 0.206 2009 307.3 0.202 2010 307.3 0.197 2011 307.2 0.191 2012 307.1 0.184 2013 307.0 0.177 2014 306.9 0.168 2015 306.8 0.159 2016 306.7 0.149 2017 306.5 0.139 2018 306.4 0.127 2019 306.2 0.115 2020 305.9 0.102 2021 305.6 0.088 2022 305.2 0.073 2023 304.5 0.057 2024 303.2 0.041 2025 300.3 0.024 2026 281.6 0.007 2027 140.2 0.012 2028 132.1 0.029 2029 129.8 0.044 2030 128.6 0.051		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic