00271-0753 A   431AB

Coord 2000	00271-0753		Discov num	A   431		Comp	AB		Coord arcsec 2000	00 27 07.77 -07 52 33.6
Date first	1903		Date last	2019		Obs	79
Pa first	353		Pa last	288		P.A. Now (θ)	283.2°
Sep first	0.2		Sep last	0.2		Sep. Now (ρ)	0.18"
Mag pri	8.84		Mag sec	8.95		delta mag (ΔM)	0.11		Spectral class	G5 (yellow)
Pri motion ra	-037		Sec motion ra	-037
Pri motion dec	+018		Sec motion dec	+018
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			00 27 08 -07 52 34	A 431 AB	2019	79	283	0.2	8.84	8.95	0.11	Y	<===
Show			00 27 08 -07 52 34	SKF 1423 AB,C	2015	7	318	110.3	8.21	14.07	5.86

Triple system
4 visible stars in this system

Precise pa	288.4		Precise sep	0.178		Constellation	Hydra		HIP	2143
Tycho2	5262-00207-1		Gaia DR2	2430329616926916480		HD	2333		ADS	363
BD	BD-08 65		Distance	55.49		Distance ly	181.01		last precise pa	288.4
last precise sep	0.178

Period (P)	53.56y		Periastron (T)	2003.58y		Semi-major axis (a)	0.364a
Eccentricity (e)	0.644		Inclination (i)	109°		Longitude of periastron (ω)	293°
Node (Ω)	25.5°		Note			Grade	2	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2013

label rho theta 2000 0.216 199.5 2001 0.161 193.2 2002 0.096 179.0 2003 0.044 115.6 2004 0.091 46.8 2005 0.147 30.6 2006 0.182 22.5 2007 0.200 16.5 2008 0.208 11.3 2009 0.208 6.2 2010 0.205 1.0 2011 0.199 355.6 2012 0.192 349.8 2013 0.185 343.5 2014 0.178 336.7 2015 0.172 329.5 2016 0.168 321.8 2017 0.166 313.8 2018 0.166 305.7 2019 0.169 297.8 2020 0.174 290.3 2021 0.181 283.2 2022 0.190 276.8 2023 0.200 270.9 2024 0.212 265.7 2025 0.224 261.0 2026 0.237 256.8 2027 0.250 253.1 2028 0.263 249.7 2029 0.277 246.7 2030 0.290 243.9		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
00271-0753	A 431	AB	2011	75	175	0.2	8.84	8.95	G5	NOD	002707.77-075233.6
00271-0753	A 431	AB	2013	76	158	0.2	8.84	8.95	G5	NO	002707.77-075233.6
00271-0753	A 431	AB	2014	77	147	0.2	8.84	8.95	G5	O	002707.77-075233.6
00271-0753	A 431	AB	2017	78	124	0.2	8.84	8.95	G5	O	002707.77-075233.6
00271-0753	A 431	AB	2019	79	288	0.2	8.84	8.95	G5	O	002707.77-075233.6

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