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20312+0513
AG 257

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

20312+0513 AG 257 (MR Del)

20^h 31^m 13.51^s +05° 13' 08.7" P.A. 75.60 sep 1.6 mag 9.49,9.77 Sp K0 dist. 48.54 pc (158.34 l.y.)

Coord 2000	20312+0513		Discov num	AG 257		Comp			Coord arcsec 2000	20 31 13.51 +05 13 08.7
Date first	1902		Date last	2016		Obs	46
Pa first	55		Pa last	75		P.A. Now (θ)	75.6°
Sep first	1.6		Sep last	1.7		Sep. Now (ρ)	1.63"
Mag pri	9.49		Mag sec	9.77		delta mag (ΔM)	0.28		Spectral class	K0 (yellow-orange)
Pri motion ra	+303		Sec motion ra	+303
Pri motion dec	+275		Sec motion dec	+275
Notes	N O (See Notes, Orbital solution)

This double is physical.

OTHER CATALOGS AND DESIGNATIONS

Precise pa	75		Precise sep	1.687		Var name	MR Del		Constellation	Delphinus
HIP	101236		Tycho2	0518-01755-1		Gaia DR2	4245659976226458752		HD	195434
BD	BD+04 4470		Distance	48.54		Distance ly	158.34		last precise pa	75
last precise sep	1.687

ORBITAL ELEMENTS

Period (P)	676.2405y	± 293.8216	Periastron (T)	1836.3877y	± 38.3978	Semi-major axis (a)	2.50711a	± 1.08477
Eccentricity (e)	0.62797	± 0.28087	Inclination (i)	75.379°	± 8.433	Longitude of periastron (ω)	272.461°	± 20.931
Node (Ω)	46.399°	± 9.075	Note			Grade	5	(1=Definitive, 9=Indet.)
Equinox			Last observation	2015

label	rho	theta
2000	1.746	70.7
2001	1.741	70.9
2002	1.736	71.1
2003	1.731	71.4
2004	1.725	71.6
2005	1.720	71.8
2006	1.715	72.0
2007	1.709	72.3
2008	1.704	72.5
2009	1.698	72.7
2010	1.693	72.9
2011	1.687	73.2
2012	1.682	73.4
2013	1.676	73.6
2014	1.671	73.9
2015	1.665	74.1
2016	1.660	74.3
2017	1.654	74.6
2018	1.648	74.8
2019	1.642	75.1
2020	1.637	75.3
2021	1.631	75.6
2022	1.625	75.8
2023	1.619	76.1
2024	1.613	76.3
2025	1.607	76.6
2026	1.602	76.8
2027	1.596	77.1
2028	1.590	77.3
2029	1.584	77.6
2030	1.578	77.9

grafico orbita

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

wds20312%2B0513b.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
20312+0513	AG 257		1999	36	70	1.7	9.49	9.77	K0	D	203113.51+051308.7
20312+0513	AG 257		2008	37	73	1.7	9.49	9.77	K0	D	203113.51+051308.7
20312+0513	AG 257		2009	44	73	1.7	9.49	9.77	K0	D	203113.51+051308.7
20312+0513	AG 257		2015	42	75	1.7	9.49	9.77	K0	NO	203113.51+051308.7
20312+0513	AG 257		2016	43	75	1.7	9.49	9.77	K0	NO	203113.51+051308.7

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