02415-7128 B  1923

Coord 2000	02415-7128		Discov num	B  1923		Comp			Coord arcsec 2000	02 41 27.29 -71 27 45.0
Date first	1931		Date last	2014		Obs	17
Pa first	37		Pa last	289		P.A. Now (θ)	256.4°
Sep first	0.6		Sep last	0.2		Sep. Now (ρ)	0.24"
Mag pri	8.13		Mag sec	9.31		delta mag (ΔM)	1.18		Spectral class	G6V (yellow)
Pri motion ra	+147		Sec motion ra	+147
Pri motion dec	-068		Sec motion dec	-068
Notes	O (Orbital solution)

This double is physical.

Constellation	Hydrus		SAO	255913		HIP	12548		Tycho2	9148-00395-1
HD	17215		CP	CP-71 156		Distance	53.76		Distance ly	175.37
last precise pa	288.8		last precise sep	0.162

Period (P)	101.5y	± 2.77	Periastron (T)	2011.42y	± 0.33	Semi-major axis (a)	0.522a	± 0.01
Eccentricity (e)	0.376	± 0.015	Inclination (i)	116.3°	± 0.9	Longitude of periastron (ω)	252.3°	± 2
Node (Ω)	222.9°	± 2.8	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label rho theta 2000 0.418 46.3 2001 0.408 44.0 2002 0.395 41.6 2003 0.380 38.9 2004 0.362 36.0 2005 0.341 32.8 2006 0.317 29.1 2007 0.291 24.9 2008 0.263 19.7 2009 0.234 13.2 2010 0.205 5.0 2011 0.179 354.2 2012 0.158 340.1 2013 0.147 322.8 2014 0.148 304.4 2015 0.162 287.7 2016 0.184 274.3 2017 0.212 264.1 2018 0.242 256.4 2019 0.273 250.4 2020 0.304 245.6 2021 0.333 241.7 2022 0.361 238.4 2023 0.387 235.6 2024 0.411 233.1 2025 0.432 230.8 2026 0.452 228.8 2027 0.470 226.9 2028 0.486 225.2 2029 0.501 223.6 2030 0.513 222.0 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
02415-7128	B 1923		1991	10	64	0.4	8.13	9.31	G6V	D	024127.29-712745.0
02415-7128	B 1923		2008	12	197	0.3	8.13	9.31	G6V	D	024127.29-712745.0
02415-7128	B 1923		2010	14	170	0.2	8.13	9.31	G6V	D	024127.29-712745.0
02415-7128	B 1923		2013	16	310	0.1	8.13	9.31	G6V	O	024127.29-712745.0
02415-7128	B 1923		2014	17	289	0.2	8.13	9.31	G6V	O	024127.29-712745.0

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