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20210+1028
J 838

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

20210+1028 J 838

20^h 21^m 00.67^s +10° 28' 21.0" P.A. 120.10 sep 6.2 mag 12.50,12.60

Coord 2000	20210+1028		Discov num	J 838		Comp			Coord arcsec 2000	20 21 00.67 +10 28 21.0
Date first	1912		Date last	2018		Obs	35
Pa first	231		Pa last	119		P.A. Now (θ)	120.1°
Sep first	2.9		Sep last	6.9		Sep. Now (ρ)	6.18"
Mag pri	12.50		Mag sec	12.60		delta mag (ΔM)	0.1		Spectral class
Pri motion ra	-018		Sec motion ra	+040
Pri motion dec	-007		Sec motion dec	-026
Notes	N O (See Notes, Orbital solution)

rPM=1.279

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	118.5		Precise sep	6.882		Constellation	Delphinus		Gaia DR2	1753567320839173888
HD	357347		ADS	13734		last precise pa	118.5		last precise sep	6.882

ORBITAL ELEMENTS

Period (P)	239.84y		Periastron (T)	1967.51y		Semi-major axis (a)	7.451a
Eccentricity (e)	0.784		Inclination (i)	77.6°		Longitude of periastron (ω)	258.1°
Node (Ω)	103°		Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox	2000		Last observation	1995

label	rho	theta
2000	5.925	113.9
2001	5.961	114.2
2002	5.995	114.5
2003	6.025	114.8
2004	6.052	115.1
2005	6.077	115.4
2006	6.099	115.7
2007	6.118	116.0
2008	6.135	116.3
2009	6.150	116.6
2010	6.163	116.9
2011	6.173	117.2
2012	6.181	117.5
2013	6.188	117.8
2014	6.192	118.1
2015	6.195	118.4
2016	6.195	118.7
2017	6.195	119.0
2018	6.192	119.3
2019	6.188	119.5
2020	6.182	119.8
2021	6.175	120.1
2022	6.167	120.4
2023	6.157	120.7
2024	6.145	121.0
2025	6.133	121.3
2026	6.119	121.6
2027	6.104	121.9
2028	6.088	122.2
2029	6.070	122.5
2030	6.052	122.8

grafico orbita

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

wds20210%2B1028a.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
20210+1028	J 838		2005	17	118	6.3	11.52	12.00		OD	202100.67+102821.0
20210+1028	J 838		2009	19	117	6.3	11.52	12.00		OD	202100.67+102821.0
20210+1028	J 838		2010	20	118	6.4	11.52	12.00		OD	202100.67+102821.0
20210+1028	J 838		2011	22	118	6.5	11.52	12.00		NOD	202100.67+102821.0
20210+1028	J 838		2013	23	118	6.6	12.50	12.60		NO	202100.67+102821.0
20210+1028	J 838		2015	24	119	6.7	12.50	12.60		NO	202100.67+102821.0
20210+1028	J 838		2016	27	119	6.8	12.50	12.60		NO	202100.67+102821.0
20210+1028	J 838		2018	32	119	6.9	12.50	12.60		NO	202100.67+102821.0

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