08447-5443 I 10 AB (Alsephina)

08^h 44^m 42.23^s -54° 42' 31.8" P.A. 189.00 sep 0.9 mag 1.99,5.57 Sp A1Va+F8V dist. 24.7 pc (80.57 l.y.)

Coord 2000	08447-5443		Discov num	I 10		Comp	AB		Coord arcsec 2000	08 44 42.23 -54 42 31.8
Date first	1894		Date last	2021		Obs	75
Pa first	177		Pa last	188.5		P.A. Now (θ)	189.8°
Sep first	2.2		Sep last	0.939		Sep. Now (ρ)	1.024"
Mag pri	1.99		Mag sec	5.57		delta mag (ΔM)	3.58		Spectral class	A1Va+F8V (white/yellow-white)
Pri motion ra	+029		Sec motion ra	-002
Pri motion dec	-104		Sec motion dec	-056
Notes	N O (See Notes, Orbital solution)

rPM=0.529

This double is physical.

08447-5443 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		236232	08 44 42 -54 42 32	KEL 1 Aa,Ab	2018	6	324	0.0	1.99			Y
Show	Alsephina	236232	08 44 42 -54 42 32	I 10 AB	2021	75	189	0.9	1.99	5.57	3.58	Y	<===
Show		236232	08 44 42 -54 42 32	HJ 4136 AC	1998	9	56	72.0	1.99	14.90	12.91
Show		236232	08 44 42 -54 42 32	I 10 AE	1998	3	251	76.8	1.99	14.70	12.71
Show		236232	08 44 42 -54 42 32	SHY 49 AF	2016	4	100	999.9	1.99	5.75	3.76
Show			08 44 49 -54 41 50	HJ 4136 CD	2015	5	86	5.6	11.00	13.50	2.50

Septuple system
6 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Common name	Alsephina		Constellation	Vela		SAO	236232		HIP	42913
Tycho2	8573-03571-1		Gaia DR2	5317047711486539392		HD	74956		HR	3485
GC	12069		GL	Gl 321.3A		CP	CP-54 1788		Bayer	Delta Velorum
Bayer name	Del Vel		Distance	24.7		Distance ly	80.57		Bayer greek	δ Vel

ORBITAL ELEMENTS

Period (P)	146.97y		Periastron (T)	2000.78y		Semi-major axis (a)	2.002a
Eccentricity (e)	0.482		Inclination (i)	105.6°		Longitude of periastron (ω)	8.5°
Node (Ω)	344.7°		Notes	n		Reference	Msn2011b
Equinox	2000		Last observation	2010		Grade	3	(1=Definitive, 9=Indet.)

label	theta	rho
2000	344.1	1.038
2001	341.9	1.022
2002	339.6	0.994
2003	337.2	0.954
2004	334.5	0.904
2005	331.5	0.846
2006	328.0	0.781
2007	323.9	0.712
2008	318.8	0.640
2009	312.4	0.569
2010	304.3	0.502
2011	293.9	0.444
2012	280.9	0.403
2013	265.7	0.384
2014	250.1	0.391
2015	236.0	0.423
2016	224.4	0.475
2017	215.3	0.540
2018	208.3	0.614
2019	202.9	0.693
2020	198.6	0.774
2021	195.1	0.857
2022	192.2	0.941
2023	189.8	1.024
2024	187.8	1.106
2025	186.0	1.188
2026	184.5	1.267
2027	183.1	1.346
2028	181.9	1.422
2029	180.8	1.497
2030	179.9	1.570

grafico orbita

Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.

wds08447-5443d.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic