02517+4559 A 1281 AB (HD 17647)

Coord 2000	02517+4559		Discov num	A  1281		Comp	AB		Coord arcsec 2000	02 51 39.69 +45 58 44.9
Date first	1906		Date last	2017		Obs	31
Pa first	189		Pa last	150.5		P.A. Now (θ)	149.9°
Sep first	0.5		Sep last	0.67		Sep. Now (ρ)	0.674"
Mag pri	8.97		Mag sec	10.72		delta mag (ΔM)	1.75		Spectral class	G5V (yellow)
Pri motion ra	+488		Sec motion ra
Pri motion dec	-286		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	HD 17647	38396	02 51 40 +45 58 45	A 1281 AB	2017	31	151	0.7	8.97	10.72	1.75	Y	<===
Show		38396	02 51 40 +45 58 45	RAO 45 AC	2012	3	82	15.2	8.97	14.67	5.70

Triple system
3 estimated visually detectable stars in this system

Name	HD 17647		Constellation	Perseus		SAO	38396		HIP	13336
Tycho2	3297-01554-1		HD	17647		GC	3416		ADS	2173
BD	BD+45 669		Distance	58.41		Distance ly	190.53

Period (P)	158.27y		Periastron (T)	1938.15y		Semi-major axis (a)	0.52a
Eccentricity (e)	0.354		Inclination (i)	43.8°		Longitude of periastron (ω)	149.6°
Node (Ω)	167.5°		Notes			Reference	Hrt2014a
Equinox	2000		Last observation	2012		Grade	3	(1=Definitive, 9=Indet.)

label theta rho 2000 125.9 0.574 2001 127.1 0.580 2002 128.3 0.586 2003 129.5 0.592 2004 130.7 0.598 2005 131.9 0.604 2006 133.0 0.610 2007 134.1 0.615 2008 135.2 0.620 2009 136.2 0.625 2010 137.3 0.630 2011 138.3 0.635 2012 139.4 0.639 2013 140.4 0.644 2014 141.4 0.648 2015 142.3 0.652 2016 143.3 0.655 2017 144.3 0.659 2018 145.2 0.662 2019 146.2 0.665 2020 147.1 0.667 2021 148.0 0.670 2022 149.0 0.672 2023 149.9 0.674 2024 150.8 0.675 2025 151.7 0.677 2026 152.6 0.678 2027 153.5 0.679 2028 154.4 0.679 2029 155.3 0.679 2030 156.2 0.679		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic