13377-2337 RST2856

Coord 2000	13377-2337		Discov num	RST2856		Comp			Coord arcsec 2000	13 37 43.02 -23 36 31.7
Date first	1935		Date last	2016		Obs	9
Pa first	116		Pa last	286		P.A. Now (θ)	287.3°
Sep first	0.2		Sep last	0.4		Sep. Now (ρ)	0.34"
Mag pri	10.30		Mag sec	10.30		delta mag (ΔM)	0		Spectral class	G5 (yellow)
Pri motion ra	-137		Sec motion ra
Pri motion dec	-010		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Precise pa	285.7		Precise sep	0.356		Constellation	Hydra		SAO	181811
Tycho2	6714-00795-1		last precise pa	285.7		last precise sep	0.356

Period (P)	122y		Periastron (T)	2038.6y		Semi-major axis (a)	0.352a
Eccentricity (e)	0.55		Inclination (i)	81.9°		Longitude of periastron (ω)	290.2°
Node (Ω)	108.7°		Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label rho theta 2000 0.350 280.6 2001 0.353 281.0 2002 0.357 281.3 2003 0.360 281.7 2004 0.363 282.0 2005 0.365 282.3 2006 0.367 282.6 2007 0.368 283.0 2008 0.369 283.3 2009 0.370 283.6 2010 0.370 283.9 2011 0.369 284.2 2012 0.368 284.5 2013 0.366 284.9 2014 0.364 285.2 2015 0.361 285.5 2016 0.357 285.8 2017 0.353 286.2 2018 0.348 286.5 2019 0.342 286.9 2020 0.335 287.3 2021 0.327 287.7 2022 0.318 288.1 2023 0.307 288.5 2024 0.296 289.0 2025 0.283 289.5 2026 0.269 290.1 2027 0.254 290.7 2028 0.237 291.4 2029 0.218 292.2 2030 0.197 293.2 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
13377-2337	RST2856		1991	7	131	0.2	10.30	10.30	G5	NO	133743.02-233631.7
13377-2337	RST2856		2008	8	104	0.4	10.30	10.30	G5	NO	133743.02-233631.7
13377-2337	RST2856		2016	9	286	0.4	10.30	10.30	G5	NO	133743.02-233631.7

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