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00026-0829
A 428

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Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

00026-0829 A 428

00^h 02^m 38.92^s -08° 29' 16.6" P.A. 279.10 sep 0.1 mag 9.82,10.07 Sp G0 dist. 134.77 pc (439.62 l.y.)

Coord 2000	00026-0829		Discov num	A 428		Comp			Coord arcsec 2000	00 02 38.92 -08 29 16.6
Date first	1902		Date last	2018		Obs	44
Pa first	111		Pa last	295		P.A. Now (θ)	279.1°
Sep first	0.2		Sep last	0.1		Sep. Now (ρ)	0.1"
Mag pri	9.82		Mag sec	10.07		delta mag (ΔM)	0.25		Spectral class	G0 (yellow)
Pri motion ra	+000		Sec motion ra
Pri motion dec	-003		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	294.6		Precise sep	0.111		Constellation	Hydra		HIP	210
Tycho2	5260-00354-1		Gaia DR2	2441125824679584896		HD	225015		ADS	4
BD	BD-09 6310		Distance	134.77		Distance ly	439.62		last precise pa	294.6
last precise sep	0.111

ORBITAL ELEMENTS

Period (P)	414.95y	± 20.96	Periastron (T)	2005.35y	± 2.47	Semi-major axis (a)	0.505a	± 0.021
Eccentricity (e)	0.503	± 0.013	Inclination (i)	111.9°	± 1.2	Longitude of periastron (ω)	226.8°	± 4.2
Node (Ω)	192.2°	± 2	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2014

label	rho	theta
2000	0.224	359.7
2001	0.217	358.2
2002	0.210	356.7
2003	0.203	355.0
2004	0.195	353.2
2005	0.188	351.3
2006	0.180	349.1
2007	0.172	346.8
2008	0.164	344.3
2009	0.156	341.5
2010	0.149	338.5
2011	0.141	335.1
2012	0.134	331.3
2013	0.127	327.1
2014	0.121	322.5
2015	0.115	317.3
2016	0.111	311.8
2017	0.107	305.7
2018	0.104	299.3
2019	0.103	292.6
2020	0.103	285.8
2021	0.104	279.1
2022	0.106	272.6
2023	0.109	266.4
2024	0.114	260.7
2025	0.119	255.5
2026	0.126	250.7
2027	0.132	246.4
2028	0.140	242.6
2029	0.148	239.1
2030	0.156	236.0

grafico orbita

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

wds00026-0829b.png orbit plot

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

WDS HISTORIC DATA

coord_2000	discov_num	comp	epoch	obs	pa	sep	mag_pri	mag_sec	spectr	notes	coord_arcsec_2000
00026-0829	A 428		1991	39	13	0.3	9.82	10.07	G0	NO	000238.92-082916.6
00026-0829	A 428		2007	40	345	0.2	9.82	10.07	G0	NO	000238.92-082916.6
00026-0829	A 428		2014	42	316	0.1	9.82	10.07	G0	O	000238.92-082916.6
00026-0829	A 428		2018	43	295	0.1	9.82	10.07	G0	O	000238.92-082916.6

If you need more information about this double, apply for a data request form to the WDS.