01084-5515 RST1205AB (Zet Phe)

Coord 2000	01084-5515		Discov num	RST1205		Comp	AB		Coord arcsec 2000	01 08 23.08 -55 14 44.7
Date first	1931		Date last	2019		Obs	34
Pa first	22		Pa last	125		P.A. Now (θ)	125.4°
Sep first	0.6		Sep last	0.6		Sep. Now (ρ)	0.58"
Mag pri	4.02		Mag sec	6.80		delta mag (ΔM)	2.78		Spectral class	B6V+B9V (blue-white/blue-white)
Pri motion ra	+010		Sec motion ra
Pri motion dec	+016		Sec motion dec
Notes	N O (See Notes, Orbital solution)

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

Show	name	SAO	coord_2000	discov#	comp	first	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show	Zet Phe	232306	01084-5515	RST1205	AB	1931	2019	34	125	0.6	4.02	6.80	2.78	Y	<===
Show		232306	01084-5515	RMK 2	AB,C	1835	2016	42	239	6.8	4.00	8.23	4.23

Triple system
4 visible stars in this system

Precise pa	125.1		Precise sep	0.579		Name	Zet Phe		Constellation	Phoenix
SAO	232306		HIP	5348		Tycho2	8476-01302-1		Gaia DR2	89156808960
HD	6882		HR	338		GC	1387		CD	CD-55 267
CP	CP-55 241		Bayer	Zeta Phoenicis		Bayer name	Zet Phe		Distance	91.58
Distance ly	298.73		last precise pa	125.1		last precise sep	0.579

Period (P)	289.6y		Periastron (T)	1920.9y		Semi-major axis (a)	1.194a
Eccentricity (e)	0.597		Inclination (i)	71.2°		Longitude of periastron (ω)	292.2°
Node (Ω)	24.9°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2017

label rho theta 2000 0.548 95.4 2001 0.547 96.9 2002 0.546 98.5 2003 0.545 100.0 2004 0.545 101.5 2005 0.544 103.1 2006 0.545 104.6 2007 0.545 106.2 2008 0.546 107.7 2009 0.547 109.3 2010 0.548 110.8 2011 0.550 112.3 2012 0.552 113.8 2013 0.554 115.3 2014 0.557 116.8 2015 0.560 118.3 2016 0.563 119.7 2017 0.566 121.2 2018 0.570 122.6 2019 0.574 124.0 2020 0.578 125.4 2021 0.583 126.7 2022 0.587 128.1 2023 0.592 129.4 2024 0.597 130.7 2025 0.603 131.9 2026 0.608 133.2 2027 0.614 134.4 2028 0.620 135.6 2029 0.626 136.8 2030 0.632 138.0 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
01084-5515	RST1205	AB	2007	13	108	0.5	4.02	6.80	B6V+B9V	NOD	010823.08-551444.7
01084-5515	RST1205	AB	2008	14	109	0.5	4.02	6.80	B6V+B9V	NOD	010823.08-551444.7
01084-5515	RST1205	AB	2009	16	110	0.5	4.02	6.80	B6V+B9V	NOD	010823.08-551444.7
01084-5515	RST1205	AB	2011	19	113	0.6	4.02	6.80	B6V B9V	NOD	010823.08-551444.7
01084-5515	RST1205	AB	2015	21	118	0.6	4.02	6.80	B6V+B9V	NO	010823.08-551444.7
01084-5515	RST1205	AB	2017	28	122	0.6	4.02	6.80	B6V+B9V	NO	010823.08-551444.7
01084-5515	RST1205	AB	2018	31	124	0.6	4.02	6.80	B6V+B9V	NO	010823.08-551444.7
01084-5515	RST1205	AB	2019	34	125	0.6	4.02	6.80	B6V+B9V	NO	010823.08-551444.7

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