09124-0707 GAA   7 (21 Hya)

Coord 2000	09124-0707		Discov num	GAA   7		Comp			Coord arcsec 2000	09 12 26.05 -07 06 35.3
Date first	2016		Date last	2017		Obs	6
Pa first	77		Pa last	73		P.A. Now (θ)	73°
Sep first	0.0		Sep last	0.0		Sep. Now (ρ)	0"
Mag pri	6.10		Mag sec	6.50		delta mag (ΔM)	0.4		Spectral class	A0m (white)
Pri motion ra	-019		Sec motion ra
Pri motion dec	+010		Sec motion dec
Notes	N O K (See Notes, Orbital solution, K-band or other infrared magnitudes)

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

Precise pa	73.2		Precise sep	0.001		Name	21 Hya		Var name	KW Hya
Constellation	Hydra		SAO	136662		HIP	45184		Tycho2	4891-01371-1
HD	79193		HR	3655		GC	12704		BD	BD-06 2845
Flamsteed	21 Hydrae		Flamsteed name	21 Hya		Distance	86.73		Distance ly	282.91
last precise pa	73.2		last precise sep	0.001

Period (P)	7.750468d	± 0.000006	Periastron (T)	24.421d (1858.943y)	± 0.032	Semi-major axis (a)	1.329m	± 0.007
Eccentricity (e)	0.094	± 0.004	Inclination (i)	92.5°	± 0.26	Longitude of periastron (ω)	225.38°	± 1.6
Node (Ω)	75.76°	± 0.11	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2017

label rho theta 2000 0.001 76.0 2001 0.001 74.1 2002 68.3 2003 0.001 262.1 2004 0.001 256.8 2005 0.001 254.4 2006 235.8 2007 0.001 78.5 2008 0.001 76.0 2009 0.001 74.1 2010 68.1 2011 0.001 261.9 2012 0.001 256.8 2013 0.001 254.3 2014 234.0 2015 0.001 78.4 2016 0.001 75.9 2017 0.001 74.0 2018 67.9 2019 0.001 261.8 2020 0.001 256.8 2021 0.001 254.3 2022 231.9 2023 0.001 78.4 2024 0.001 75.9 2025 0.001 74.0 2026 67.7 2027 0.001 261.6 2028 0.001 256.7 2029 0.001 254.3 2030 229.4		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
09124-0707	GAA 7		2017	6	73	0.0	6.10	6.50	A0m	NO K	091226.05-070635.3

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