01512+2439 HO  311

Coord 2000	01512+2439		Discov num	HO  311		Comp			Coord arcsec 2000	01 51 13.34 +24 39 08.0
Date first	1890		Date last	2018		Obs	105
Pa first	174		Pa last	178		P.A. Now (θ)	359.6°
Sep first	0.4		Sep last	0.4		Sep. Now (ρ)	0.41"
Mag pri	8.22		Mag sec	7.82		delta mag (ΔM)	0.4		Spectral class	F1V (yellow-white)
Pri motion ra	-004		Sec motion ra
Pri motion dec	-026		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	178.4		Precise sep	0.417		Constellation	Aries		SAO	74984
HIP	8622		Tycho2	1756-00668-1		HD	11284		ADS	1473
BD	BD+23 246		Distance	131.06		Distance ly	427.52		last precise pa	178.4
last precise sep	0.417

Period (P)	119.3y	± 6.2	Periastron (T)	1982.72y	± 0.4	Semi-major axis (a)	0.298a	± 0.0062
Eccentricity (e)	0.888	± 0.016	Inclination (i)	52.8°	± 1.7	Longitude of periastron (ω)	142°	± 3.9
Node (Ω)	32.8°	± 3.9	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.255 346.1 2001 0.265 347.2 2002 0.275 348.2 2003 0.285 349.2 2004 0.295 350.0 2005 0.304 350.9 2006 0.313 351.7 2007 0.322 352.4 2008 0.330 353.1 2009 0.338 353.8 2010 0.346 354.4 2011 0.354 355.0 2012 0.361 355.6 2013 0.369 356.2 2014 0.376 356.7 2015 0.382 357.2 2016 0.389 357.7 2017 0.395 358.2 2018 0.401 358.7 2019 0.407 359.1 2020 0.413 359.6 2021 0.419 360.0 2022 0.424 0.4 2023 0.429 0.8 2024 0.434 1.2 2025 0.439 1.6 2026 0.443 2.0 2027 0.448 2.4 2028 0.452 2.7 2029 0.456 3.1 2030 0.459 3.5 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
01512+2439	HO 311		2002	101	170	0.3	8.22	7.82	F1V	NOD	015113.34+243908.0
01512+2439	HO 311		2008	102	174	0.3	8.22	7.82	F1V	NOD	015113.34+243908.0
01512+2439	HO 311		2014	102	177	0.4	8.22	7.82	F1V	NO	015113.34+243908.0
01512+2439	HO 311		2018	105	178	0.4	8.22	7.82	F1V	NO	015113.34+243908.0

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