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21041+0359
TOK 371

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

21041+0359 TOK 371

21^h 04^m 05.69^s +03° 58' 50.4" P.A. 273.20 sep 0.1 mag 8.42,9.00 Sp G5 dist. 65.75 pc (214.48 l.y.)

Coord 2000	21041+0359		Discov num	TOK 371		Comp			Coord arcsec 2000	21 04 05.69 +03 58 50.4
Date first	2012		Date last	2020		Obs	10
Pa first	110		Pa last	265		P.A. Now (θ)	273.2°
Sep first	0.1		Sep last	0.1		Sep. Now (ρ)	0.11"
Mag pri	8.42		Mag sec	9.00		delta mag (ΔM)	0.58		Spectral class	G5 (yellow)
Pri motion ra	-071		Sec motion ra
Pri motion dec	-156		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	265.1		Precise sep	0.14		Constellation	Equuleus		HIP	103983
Tycho2	0534-00970-1		Gaia DR2	1732831875859320576		HD	200565		BD	BD+03 4493
Distance	65.75		Distance ly	214.48		last precise pa	265.1		last precise sep	0.14

ORBITAL ELEMENTS

Period (P)	13.3y		Periastron (T)	2011.21y		Semi-major axis (a)	0.104a
Eccentricity (e)	0.29		Inclination (i)	20.4°		Longitude of periastron (ω)	319.8°
Node (Ω)	79.8°		Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	2018

label	rho	theta
2000	0.092	127.0
2001	0.103	154.9
2002	0.114	177.4
2003	0.123	196.1
2004	0.129	212.7
2005	0.131	228.1
2006	0.129	243.5
2007	0.122	260.0
2008	0.110	279.4
2009	0.093	304.8
2010	0.077	341.5
2011	0.071	30.7
2012	0.078	78.9
2013	0.088	117.2
2014	0.099	147.2
2015	0.110	171.1
2016	0.120	190.8
2017	0.127	207.9
2018	0.131	223.6
2019	0.130	238.9
2020	0.125	254.9
2021	0.114	273.2
2022	0.099	296.3
2023	0.082	329.0
2024	0.072	15.2
2025	0.075	65.3
2026	0.085	106.7
2027	0.096	138.9
2028	0.107	164.4
2029	0.117	185.2
2030	0.126	203.0

grafico orbita

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

wds21041%2B0359a.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
21041+0359	TOK 371		2012	2	112	0.1	8.42	9.00	G5	N	210405.69+035850.4
21041+0359	TOK 371		2014	4	170	0.1	8.42	9.00	G5	N	210405.69+035850.4
21041+0359	TOK 371		2015	5	182	0.1	8.42	9.00	G5	N	210405.69+035850.4
21041+0359	TOK 371		2017	7	215	0.1	8.42	9.00	G5	N	210405.69+035850.4
21041+0359	TOK 371		2018	8	230	0.1	8.42	9.00	G5	NO	210405.69+035850.4
21041+0359	TOK 371		2019	9	245	0.1	8.42	9.00	G5	NO	210405.69+035850.4

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