01520+1326 HU 1213

Coord 2000	01520+1326		Discov num	HU 1213		Comp			Coord arcsec 2000	01 51 57.60 +13 25 38.0
Date first	1904		Date last	2017		Obs	24
Pa first	144		Pa last	46		P.A. Now (θ)	64.9°
Sep first	0.2		Sep last	0.0		Sep. Now (ρ)	0.07"
Mag pri	9.46		Mag sec	9.87		delta mag (ΔM)	0.41		Spectral class	A3 (white)
Pri motion ra	+012		Sec motion ra
Pri motion dec	+005		Sec motion dec
Notes	O (Orbital solution)

Visually invisible, K-band or other infrared star This double is physical.

Precise pa	46.4		Precise sep	0.025		Constellation	Aries		SAO	92668
HIP	8703		Tycho2	0628-01011-1		Gaia DR2	66617401600		HD	11364
ADS	1482		BD	BD+12 246		Distance	210.97		Distance ly	688.18
last precise pa	46.4		last precise sep	0.025

Period (P)	200y		Periastron (T)	1830y		Semi-major axis (a)	0.13a
Eccentricity (e)	0.725		Inclination (i)	139.4°		Longitude of periastron (ω)	119.6°
Node (Ω)	81.3°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1995

label rho theta 2000 0.135 97.1 2001 0.133 96.2 2002 0.130 95.3 2003 0.128 94.3 2004 0.125 93.3 2005 0.123 92.3 2006 0.120 91.2 2007 0.117 90.1 2008 0.114 88.9 2009 0.111 87.6 2010 0.107 86.3 2011 0.104 84.9 2012 0.101 83.4 2013 0.097 81.7 2014 0.093 80.0 2015 0.089 78.1 2016 0.085 76.0 2017 0.081 73.7 2018 0.077 71.1 2019 0.072 68.2 2020 0.067 64.9 2021 0.062 61.1 2022 0.057 56.6 2023 0.052 51.2 2024 0.046 44.5 2025 0.041 36.1 2026 0.036 25.2 2027 0.032 11.2 2028 0.029 353.7 2029 0.028 333.9 2030 0.029 314.5 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
01520+1326	HU 1213		1995	19	99	0.1	9.46	9.87	A3	O	015157.60+132538.0
01520+1326	HU 1213		2007	20	103	0.1	9.46	9.87	A3	O	015157.60+132538.0
01520+1326	HU 1213		2015	22	63	0.1	9.46	9.87	A3	O	015157.60+132538.0
01520+1326	HU 1213		2017	24	46	0.0	9.46	9.87	A3	O	015157.60+132538.0

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