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20212-5147
HDS2907

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

20212-5147 HDS2907

20^h 21^m 10.95^s -51° 47' 28.6" P.A. 31.80 sep 0.3 mag 10.86,11.32 Sp M0 dist. 24.01 pc (78.32 l.y.)

Coord 2000	20212-5147		Discov num	HDS2907		Comp			Coord arcsec 2000	20 21 10.95 -51 47 28.6
Date first	1991		Date last	2020		Obs	11
Pa first	31		Pa last	29		P.A. Now (θ)	31.8°
Sep first	0.3		Sep last	0.3		Sep. Now (ρ)	0.3"
Mag pri	10.86		Mag sec	11.32		delta mag (ΔM)	0.46		Spectral class	M0 (red)
Pri motion ra	-040		Sec motion ra
Pri motion dec	+094		Sec motion dec
Notes	O (Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	29		Precise sep	0.299		Constellation	Telescopium		HIP	100356
Tycho2	8417-00626-1		Gaia DR2	6475337306723609600		GL	NN 4145		Distance	24.01
Distance ly	78.32		last precise pa	29		last precise sep	0.299

ORBITAL ELEMENTS

Period (P)	9.886y	± 0.129	Periastron (T)	2017.514y	± 0.016	Semi-major axis (a)	0.1948a	± 0.0047
Eccentricity (e)	0.651	± 0.016	Inclination (i)	48.8°	± 2.3	Longitude of periastron (ω)	194°	± 5.5
Node (Ω)	32.7°	± 3.2	Note			Grade	3	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation

label	rho	theta
2000	0.243	20.5
2001	0.294	30.0
2002	0.316	37.3
2003	0.313	44.2
2004	0.286	51.9
2005	0.235	62.0
2006	0.160	80.0
2007	0.079	137.8
2008	0.060	291.7
2009	0.168	5.9
2010	0.250	21.8
2011	0.298	30.9
2012	0.317	38.1
2013	0.311	45.0
2014	0.281	52.8
2015	0.228	63.5
2016	0.150	83.3
2017	0.074	151.3
2018	0.068	311.1
2019	0.179	8.5
2020	0.258	23.0
2021	0.301	31.8
2022	0.317	38.9
2023	0.309	45.9
2024	0.276	53.9
2025	0.220	65.0
2026	0.140	87.1
2027	0.072	166.0
2028	0.079	325.9
2029	0.190	10.8
2030	0.264	24.2

grafico orbita

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

wds20212-5147e.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
20212-5147	HDS2907		1991	1	31	0.3	10.86	11.32	M0		202110.95-514728.6
20212-5147	HDS2907		2014	2	60	0.2	10.86	11.32	M0		202110.95-514728.6
20212-5147	HDS2907		2015	3	72	0.2	10.86	11.32	M0		202110.95-514728.6
20212-5147	HDS2907		2017	7	210	0.1	10.86	11.32	M0		202110.95-514728.6
20212-5147	HDS2907		2018	9	359	0.1	10.86	11.32	M0	O	202110.95-514728.6
20212-5147	HDS2907		2019	10	14	0.2	10.86	11.32	M0	O	202110.95-514728.6

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