21145+1000 STT 535 AB

21^h 14^m 28.81^s +10° 00' 25.1" P.A. 7.00 sep 0.1 mag 5.19,5.52 Sp F6V+F6V dist. 18.49 pc (60.31 l.y.)

Coord 2000	21145+1000		Discov num	STT 535		Comp	AB		Coord arcsec 2000	21 14 28.81 +10 00 25.1
Date first	1852		Date last	2021		Obs	521
Pa first	15		Pa last	7		P.A. Now (θ)	28.9°
Sep first	0.4		Sep last	0.076		Sep. Now (ρ)	0.246"
Mag pri	5.19		Mag sec	5.52		delta mag (ΔM)	0.33		Spectral class	F6V+F6V (yellow-white/yellow-white)
Pri motion ra	+040		Sec motion ra
Pri motion dec	-304		Sec motion dec
Notes	N O (See Notes, Orbital solution)

This double is physical.

21145+1000 SYSTEM COMPONENTS

Show	name	SAO	coord	wds_name	last	obs	pa	sep	mag1	mag2	d_mag	orb	current
Show		126643	21 14 29 +10 00 25	STT 535 AB	2021	521	7	0.1	5.19	5.52	0.33	Y	<===
Show	Del Equ	126643	21 14 29 +10 00 25	STF 2777 AB,C	2016	91	6	76.5	4.54	10.17	5.63

Triple system
4 estimated visually detectable stars in this system

OTHER CATALOGS AND DESIGNATIONS

Constellation	Equuleus		SAO	126643		HIP	104858		Tycho2	1109-02583-1
Gaia DR2	1743871762876699776		HD	202275		HR	8123		GC	29697
ADS	14773		GL	Gl 822A		BD	BD+09 4746		Bayer	Delta Equulei
Bayer name	Del Equ		Flamsteed	7 Equulei		Flamsteed name	7 Equ		Distance	18.49
Distance ly	60.31		Bayer greek	δ Equ

ORBITAL ELEMENTS

Period (P)	2084.03d (5.71y)	± 0.1	Periastron (T)	53112.071m (2004.293y)	± 0.052	Semi-major axis (a)	231.965m	± 0.008
Eccentricity (e)	0.436851	± 0.000025	Inclination (i)	99.4083°	± 0.0098	Longitude of periastron (ω)	187.735°	± 0.013
Node (Ω)	23.362°	± 0.012	Notes	n		Reference	Mut2008
Equinox	2000		Last observation	2007		Grade	1	(1=Definitive, 9=Indet.)

label	theta	rho
2000-01-01	30.6	0.215
2001-01-01	24.1	0.327
2002-01-01	19.3	0.298
2003-01-01	8.4	0.140
2004-01-01	211.4	0.111
2005-01-01	61.5	0.050
2006-01-01	28.0	0.264
2007-01-01	22.8	0.332
2008-01-01	17.5	0.265
2009-01-01	354.3	0.074
2010-01-01	202.1	0.129
2011-01-01	38.0	0.125
2012-01-01	26.2	0.299
2013-01-01	21.4	0.326
2014-01-01	15.0	0.220
2015-01-01	270.8	0.034
2016-01-01	189.4	0.083
2017-01-01	32.0	0.192
2018-01-01	24.7	0.321
2019-01-01	20.0	0.308
2020-01-01	11.0	0.165
2021-01-01	217.3	0.090
2022-01-01	104.9	0.030
2023-01-01	28.9	0.246
2024-01-01	23.3	0.331
2025-01-01	18.3	0.279
2026-01-01	2.2	0.101
2027-01-01	205.5	0.130
2028-01-01	42.9	0.095
2029-01-01	26.9	0.286
2030-01-01	22.0	0.330

grafico orbita

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

wds21145%2B1000a.png orbit plot

Measures: green=micrometric, blue=interferometric, purple=photographic