01556+0146 BU 1367

Coord 2000	01556+0146		Discov num	BU 1367		Comp			Coord arcsec 2000	01 55 33.97 +01 45 56.9
Date first	1904		Date last	2001		Obs	24
Pa first	30		Pa last	89		P.A. Now (θ)	109.4°
Sep first	0.9		Sep last	0.6		Sep. Now (ρ)	0.73"
Mag pri	10.44		Mag sec	10.71		delta mag (ΔM)	0.27		Spectral class	K2 (yellow-orange)
Pri motion ra	-002		Sec motion ra	-002
Pri motion dec	-017		Sec motion dec	-017
Notes	N O (See Notes, Orbital solution)

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

Precise pa	89.3		Precise sep	0.61		Constellation	Cetus		Tycho2	0030-00736-1
Gaia DR2	83441853824		ADS	1533		last precise pa	89.3		last precise sep	0.61

Period (P)	882.5951y	± 507.1726	Periastron (T)	1884.0678y	± 31.8613	Semi-major axis (a)	3.7532a	± 2.38687
Eccentricity (e)	0.88304	± 0.12481	Inclination (i)	80.859°	± 10.007	Longitude of periastron (ω)	291.812°	± 27.663
Node (Ω)	19.732°	± 10.395	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox			Last observation	2001

label rho theta 2000 0.696 92.2 2001 0.696 93.1 2002 0.697 94.0 2003 0.697 94.9 2004 0.698 95.8 2005 0.699 96.7 2006 0.700 97.5 2007 0.701 98.4 2008 0.702 99.3 2009 0.703 100.1 2010 0.705 101.0 2011 0.707 101.9 2012 0.708 102.7 2013 0.710 103.6 2014 0.712 104.4 2015 0.715 105.3 2016 0.717 106.1 2017 0.719 106.9 2018 0.722 107.8 2019 0.725 108.6 2020 0.728 109.4 2021 0.731 110.2 2022 0.734 111.0 2023 0.737 111.8 2024 0.740 112.6 2025 0.744 113.3 2026 0.747 114.1 2027 0.751 114.9 2028 0.755 115.6 2029 0.759 116.4 2030 0.763 117.1 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
01556+0146	BU 1367		2001	24	89	0.6	10.44	10.71	K2	N	015533.97+014556.9

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