01166+1831 HDS 169

Coord 2000	01166+1831		Discov num	HDS 169		Comp			Coord arcsec 2000	01 16 36.45 +18 31 21.6
Date first	1991		Date last	2013		Obs	11
Pa first	264		Pa last	234		P.A. Now (θ)	226.1°
Sep first	0.6		Sep last	0.6		Sep. Now (ρ)	0.6"
Mag pri	8.61		Mag sec	12.20		delta mag (ΔM)	3.59		Spectral class	G5 (yellow)
Pri motion ra	+282		Sec motion ra
Pri motion dec	+020		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

Precise pa	234.2		Precise sep	0.604		Constellation	Pisces		SAO	92344
HIP	5952		Tycho2	1200-01141-1		Gaia DR2	17611229056		HD	7640
BD	BD+17 176		Distance	63.86		Distance ly	208.31		last precise pa	234.2
last precise sep	0.604

Period (P)	143.73y		Periastron (T)	2115.16y		Semi-major axis (a)	0.767a
Eccentricity (e)	0.575		Inclination (i)	118.3°		Longitude of periastron (ω)	93.9°
Node (Ω)	102.7°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2010

label rho theta 2000 0.647 253.7 2001 0.647 252.4 2002 0.646 251.0 2003 0.645 249.6 2004 0.643 248.3 2005 0.641 246.9 2006 0.639 245.5 2007 0.637 244.1 2008 0.634 242.7 2009 0.631 241.2 2010 0.628 239.8 2011 0.625 238.3 2012 0.622 236.9 2013 0.619 235.4 2014 0.616 233.9 2015 0.613 232.4 2016 0.609 230.8 2017 0.606 229.3 2018 0.603 227.7 2019 0.600 226.1 2020 0.597 224.5 2021 0.594 222.9 2022 0.591 221.3 2023 0.588 219.7 2024 0.585 218.0 2025 0.583 216.3 2026 0.581 214.6 2027 0.579 212.9 2028 0.577 211.2 2029 0.575 209.5 2030 0.574 207.8 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
01166+1831	HDS 169		1999	3	254	0.6	8.61	12.20	G5	D	011636.28+183121.4
01166+1831	HDS 169		2004	4	248	0.6	8.61	12.20	G5	D	011636.28+183121.4
01166+1831	HDS 169		2007	6	244	0.6	8.61	12.20	G5	D	011636.28+183121.4
01166+1831	HDS 169		2010	8	239	0.6	8.61	12.20	G5	D	011636.28+183121.4
01166+1831	HDS 169		2012	10	235	0.6	8.61	12.20	G5	OD	011636.28+183121.4
01166+1831	HDS 169		2013	11	234	0.6	8.61	12.20	G5	NO	011636.45+183121.6

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