01570+3101 A 819 AB

Coord 2000	01570+3101		Discov num	A   819		Comp	AB		Coord arcsec 2000	01 57 01.33 +31 01 22.4
Date first	1904		Date last	2013		Obs	51
Pa first	132		Pa last	0.6		P.A. Now (θ)	76.8°
Sep first	0.5		Sep last	0.14		Sep. Now (ρ)	0.201"
Mag pri	8.16		Mag sec	9.30		delta mag (ΔM)	1.14		Spectral class	F5 (yellow-white)
Pri motion ra	+028		Sec motion ra
Pri motion dec	-076		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		55122	01 57 01 +31 01 22	A 819 AB	2013	51	1	0.1	8.16	9.30	1.14	Y	<===
Show	HD 11849	55122	01 57 01 +31 01 22	A 819 AB,C	2014	15	271	66.4	7.79	10.00	2.21

Triple system
4 estimated visually detectable stars in this system

Constellation	Triangulum		SAO	55122		HIP	9087		Tycho2	2308-01185-1
Gaia DR2	301165516273256576		HD	11849		ADS	1548		BD	BD+30 303
Distance	86.06		Distance ly	280.73

Period (P)	138.6y	± 3.7	Periastron (T)	2010.8y	± 0.41	Semi-major axis (a)	0.421a	± 0.026
Eccentricity (e)	0.546	± 0.006	Inclination (i)	48.8°	± 2.3	Longitude of periastron (ω)	186.8°	± 2.3
Node (Ω)	154.1°	± 1.5	Notes	n		Reference	Sca2021b
Equinox			Last observation	2020		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 261.3 0.191 2001 268.4 0.187 2002 275.7 0.185 2003 283.2 0.184 2004 290.6 0.185 2005 298.0 0.186 2006 305.2 0.188 2007 312.3 0.190 2008 319.3 0.192 2009 326.2 0.192 2010 333.0 0.192 2011 340.0 0.190 2012 347.2 0.187 2013 354.6 0.182 2014 2.4 0.178 2015 10.7 0.173 2016 19.3 0.170 2017 28.2 0.168 2018 37.3 0.168 2019 46.2 0.170 2020 54.7 0.175 2021 62.8 0.181 2022 70.2 0.190 2023 76.8 0.201 2024 82.8 0.212 2025 88.1 0.225 2026 92.9 0.238 2027 97.1 0.252 2028 100.9 0.266 2029 104.3 0.281 2030 107.3 0.295		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic