01158+0947 A  2102

Coord 2000	01158+0947		Discov num	A  2102		Comp			Coord arcsec 2000	01 15 46.78 +09 47 05.3
Date first	1909		Date last	2016		Obs	28
Pa first	149		Pa last	96		P.A. Now (θ)	93.1°
Sep first	0.5		Sep last	0.2		Sep. Now (ρ)	0.21"
Mag pri	7.36		Mag sec	9.89		delta mag (ΔM)	2.53		Spectral class	F4V (yellow-white)
Pri motion ra	-083		Sec motion ra
Pri motion dec	+043		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	96.2		Precise sep	0.235		Constellation	Pisces		HIP	5898
Tycho2	0613-00226-1		Gaia DR2	22143890304		HD	7564		ADS	1016
BD	BD+09 142		Distance	57.41		Distance ly	187.27		last precise pa	96.2
last precise sep	0.235

Period (P)	162y	± 13	Periastron (T)	2101y	± 13	Semi-major axis (a)	0.607a	± 0.035
Eccentricity (e)	0.447	± 0.054	Inclination (i)	101.7°	± 1	Longitude of periastron (ω)	262.8°	± 6.6
Node (Ω)	151.2°	± 2.1	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2012

label rho theta 2000 0.407 129.3 2001 0.397 128.4 2002 0.387 127.4 2003 0.376 126.4 2004 0.366 125.3 2005 0.355 124.2 2006 0.345 123.0 2007 0.334 121.7 2008 0.323 120.3 2009 0.313 118.8 2010 0.302 117.3 2011 0.292 115.6 2012 0.281 113.8 2013 0.271 111.8 2014 0.261 109.7 2015 0.251 107.4 2016 0.242 105.0 2017 0.233 102.4 2018 0.224 99.5 2019 0.216 96.4 2020 0.208 93.1 2021 0.201 89.6 2022 0.195 85.8 2023 0.189 81.8 2024 0.185 77.5 2025 0.181 73.1 2026 0.179 68.5 2027 0.177 63.8 2028 0.177 59.1 2029 0.178 54.3 2030 0.180 49.7 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
01158+0947	A 2102		1994	22	138	0.5	7.36	9.89	F4V	NOD	011546.78+094705.3
01158+0947	A 2102		2008	24	118	0.3	7.36	9.89	F4V	NOD	011546.78+094705.3
01158+0947	A 2102		2009	25	115	0.3	7.36	9.89	F4V	NOD	011546.78+094705.3
01158+0947	A 2102		2012	26	114	0.2	7.36	9.89	F4V	NOD	011546.78+094705.3
01158+0947	A 2102		2016	28	96	0.2	7.36	9.89	F4V	NO	011546.78+094705.3

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