09207-0742 A  1082AB

Coord 2000	09207-0742		Discov num	A  1082		Comp	AB		Coord arcsec 2000	09 20 39.31 -07 41 56.0
Date first	1905		Date last	2019		Obs	23
Pa first	160		Pa last	200		P.A. Now (θ)	199.5°
Sep first	0.8		Sep last	0.6		Sep. Now (ρ)	0.59"
Mag pri	9.30		Mag sec	10.40		delta mag (ΔM)	1.1		Spectral class	K0 (yellow-orange)
Pri motion ra	-135		Sec motion ra
Pri motion dec	-014		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			09 20 39 -07 41 56	A 1082 AB	2019	23	200	0.6	9.30	10.40	1.10	Y	<===
Show			09 20 44 -07 43 48	BGH 4 CA	2015	17	326	135.0	7.46	9.30	1.84
Show			09 20 44 -07 43 48	TOK 527 CD	2015	4	342	999.9	7.46	17.80	10.34

Quadruple system
4 visible stars in this system

Precise pa	200.2		Precise sep	0.586		Constellation	Hydra		Tycho2	5459-00108-1
Gaia DR2	5744858885451276544		HD	80615		ADS	7316		last precise pa	200.2
last precise sep	0.586

Period (P)	212.7y		Periastron (T)	1987.66y		Semi-major axis (a)	0.6a
Eccentricity (e)	0.644		Inclination (i)	127°		Longitude of periastron (ω)	24.2°
Node (Ω)	5°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2009

label rho theta 2000 0.232 240.6 2001 0.250 235.8 2002 0.269 231.6 2003 0.288 228.0 2004 0.307 224.8 2005 0.326 222.0 2006 0.345 219.6 2007 0.364 217.3 2008 0.383 215.3 2009 0.401 213.5 2010 0.419 211.8 2011 0.436 210.3 2012 0.453 208.9 2013 0.470 207.5 2014 0.486 206.3 2015 0.502 205.2 2016 0.518 204.1 2017 0.533 203.1 2018 0.548 202.1 2019 0.562 201.2 2020 0.576 200.3 2021 0.590 199.5 2022 0.604 198.7 2023 0.617 198.0 2024 0.630 197.2 2025 0.642 196.5 2026 0.654 195.9 2027 0.666 195.2 2028 0.677 194.6 2029 0.689 194.0 2030 0.700 193.4		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
09207-0742	A 1082	AB	1991	17	327	0.2	9.40	10.40	K0	NO	092039.31-074156.0
09207-0742	A 1082	AB	2009	18	214	0.4	9.40	10.40	K0	NO	092039.31-074156.0
09207-0742	A 1082	AB	2011	19	211	0.4	9.30	10.40	K0	NO	092039.31-074156.0
09207-0742	A 1082	AB	2013	20	207	0.5	9.30	10.40	K0	NO	092039.31-074156.0
09207-0742	A 1082	AB	2019	22	200	0.6	9.30	10.40	K0	O	092039.31-074156.0

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