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00210+6740
HJ 1018

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

00210+6740 HJ 1018

00^h 20^m 57.23^s +67° 40' 03.0" P.A. 87.70 sep 1.6 mag 8.57,8.89 Sp G5 dist. 31.74 pc (103.54 l.y.)

Coord 2000	00210+6740		Discov num	HJ 1018		Comp			Coord arcsec 2000	00 20 57.23 +67 40 03.0
Date first	1828		Date last	2020		Obs	92
Pa first	84		Pa last	87		P.A. Now (θ)	87.7°
Sep first	1.5		Sep last	1.5		Sep. Now (ρ)	1.62"
Mag pri	8.57		Mag sec	8.89		delta mag (ΔM)	0.32		Spectral class	G5 (yellow)
Pri motion ra	+027		Sec motion ra	+027
Pri motion dec	+078		Sec motion dec	+078
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	87		Precise sep	1.529		Constellation	Hydra		SAO	11124
HIP	1674		Tycho2	4294-00406-1		Gaia DR2	528767648745379200		HD	1624
ADS	283		BD	BD+66 19		Distance	31.74		Distance ly	103.54
last precise pa	87		last precise sep	1.529

ORBITAL ELEMENTS

Period (P)	154.2328y	± 3.6474	Periastron (T)	1942.7553y	± 1.6671	Semi-major axis (a)	0.97822a	± 0.05546
Eccentricity (e)	0.91379	± 0.02389	Inclination (i)	88.271°	± 1.571	Longitude of periastron (ω)	210.113°	± 10.154
Node (Ω)	86.735°	± 1.129	Note			Grade	4	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label	rho	theta
2000	1.626	87.5
2001	1.629	87.5
2002	1.633	87.6
2003	1.635	87.6
2004	1.638	87.6
2005	1.639	87.6
2006	1.641	87.6
2007	1.642	87.6
2008	1.643	87.6
2009	1.643	87.6
2010	1.643	87.6
2011	1.642	87.6
2012	1.641	87.7
2013	1.640	87.7
2014	1.638	87.7
2015	1.636	87.7
2016	1.633	87.7
2017	1.630	87.7
2018	1.627	87.7
2019	1.623	87.7
2020	1.619	87.7
2021	1.615	87.7
2022	1.610	87.8
2023	1.605	87.8
2024	1.599	87.8
2025	1.593	87.8
2026	1.587	87.8
2027	1.580	87.8
2028	1.573	87.8
2029	1.565	87.8
2030	1.557	87.8

grafico orbita

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

wds00210%2B6740b.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
00210+6740	HJ 1018		2006	87	88	1.6	8.57	8.89	G5	NOD	002057.23+674003.0
00210+6740	HJ 1018		2009	88	89	1.8	8.57	8.89	G5	NOD	002057.23+674003.0
00210+6740	HJ 1018		2014	88	86	1.7	8.57	8.89	G5	NO	002057.23+674003.0
00210+6740	HJ 1018		2015	89	88	1.7	8.57	8.89	G5	NO	002057.23+674003.0
00210+6740	HJ 1018		2016	92	89	1.7	8.57	8.89	G5	NO	002057.23+674003.0
00210+6740	HJ 1018		2020	90	87	1.5	8.57	8.89	G5	NO	002057.23+674003.0

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