00247-2653 LEI 1 AB

Coord 2000	00247-2653		Discov num	LEI   1		Comp	AB		Coord arcsec 2000	00 24 44.22 -27 08 25.0
Date first	1993		Date last	2021		Obs	70
Pa first	353		Pa last	62.3		P.A. Now (θ)	62.3°
Sep first	1.1		Sep last	0.891		Sep. Now (ρ)	0.891"
Mag pri	15.40		Mag sec	18.69		delta mag (ΔM)	3.29		Spectral class	M5.5V+M9V (red/red)
Pri motion ra	-093		Sec motion ra	-055
Pri motion dec	+696		Sec motion dec	+612
Notes	N O (See Notes, Orbital solution)

rPM=0.131 (< 0.3, Physical double) This double is physical.

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show			00 24 44 -27 08 25	HEN 5 Aa,Ab	1998	0	-1	0.1	15.50	18.00	2.50
Show			00 24 44 -27 08 25	LEI 1 AB	2021	70	62	0.9	15.40	18.69	3.29		<===
Show			00 24 44 -27 08 25	LEI 1 AC	2010	3	23	1.5	15.40	19.07	3.67
Show			00 24 44 -27 08 26	LEI 1 BC	2021	84	183	0.5	18.69	19.07	0.38	Y

Quadruple system
3 estimated visually detectable stars in this system

Constellation

Sculptor

Identifier	00247-2653 LEI 1 A,BC
coord_arcsec_2000	002444.25-270827.9

Period (P)	44.4y	± 7.2	Periastron (T)	59727.9d (2022.405y)	± 3.4	Semi-major axis (a)	1.1116a	± 0.001
Eccentricity (e)	0.52	± 0.0016	Inclination (i)	54.75°	± 0.5	Longitude of periastron (ω)	147.61°	± 4.25
Node (Ω)	26.8°	± 0.08	Notes	n		Reference	Koh2012
Equinox	2000		Last observation	2008		Grade	5	(1=Definitive, 9=Indet.)

label theta rho 2000 6.3 1.513 2001 8.4 1.541 2002 10.4 1.562 2003 12.4 1.576 2004 14.4 1.582 2005 16.4 1.581 2006 18.4 1.571 2007 20.4 1.553 2008 22.5 1.526 2009 24.6 1.490 2010 26.9 1.443 2011 29.4 1.386 2012 32.1 1.317 2013 35.1 1.236 2014 38.6 1.142 2015 42.8 1.034 2016 48.0 0.912 2017 55.0 0.777 2018 65.0 0.633 2019 81.0 0.489 2020 108.2 0.381 2021 145.7 0.364 2022 177.2 0.441 2023 198.2 0.531 2024 213.9 0.583 2025 228.0 0.597 2026 242.0 0.592 2027 256.3 0.585 2028 270.7 0.589 2029 284.5 0.611 2030 297.0 0.650		Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
		Measures: green=micrometric, blue=interferometric, purple=photographic