20213+0250 HLD 158

 
 
20h 21m 17.43s +02 50' 21.9" P.A. 41.4 sep 1.22 mag 9.71,9.78 Sp G0 dist. 440.53 pc (1437.01 l.y.)
 
 
Coord 2000
20213+0250
Discov num
HLD 158
Comp
Coord arcsec 2000
20 21 17.43 +02 50 21.9
Date first
1882
Date last
2017
Obs
68
Pa first
40
Pa last
42
P.A. Now (θ)
41.4°
Sep first
2.0
Sep last
1.2
Sep. Now (ρ)
1.22"
Mag pri
9.71
Mag sec
9.78
delta mag (ΔM)
0.07
Spectral class
G0 (yellow)
Pri motion ra
+064
Sec motion ra
+064
Pri motion dec
-019
Sec motion dec
-019
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
42
Precise sep
1.204
Constellation
Aquila
HIP
100355
Tycho2
0500-00340-1
Gaia DR2
20259760128
HD
193651
ADS
13738
Distance
440.53
Distance ly
1437.01
last precise pa
42
last precise sep
1.204
 
 
ORBITAL ELEMENTS
 
 
Period (P)232.4y Periastron (T)1961.16y Semi-major axis (a)0.858a
Eccentricity (e)0.746 Inclination (i)128.6° Longitude of periastron (ω)17.7°
Node (Ω)218.3° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2016
label rho theta
2000 0.966 48.9
2001 0.982 48.4
2002 0.998 47.9
2003 1.014 47.4
2004 1.029 47.0
2005 1.044 46.5
2006 1.059 46.1
2007 1.073 45.7
2008 1.087 45.3
2009 1.100 44.9
2010 1.114 44.5
2011 1.127 44.1
2012 1.139 43.7
2013 1.152 43.4
2014 1.164 43.0
2015 1.176 42.7
2016 1.187 42.3
2017 1.198 42.0
2018 1.209 41.7
2019 1.220 41.4
2020 1.230 41.0
2021 1.240 40.7
2022 1.250 40.4
2023 1.260 40.1
2024 1.269 39.8
2025 1.278 39.5
2026 1.287 39.2
2027 1.296 39.0
2028 1.304 38.7
2029 1.312 38.4
2030 1.320 38.1

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






wds20213%2B0250a.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
20213+0250 HLD 158 2001 61 48 1.0 9.71 9.78 G0 NO 202117.43+025021.9
20213+0250 HLD 158 2006 62 45 1.1 9.71 9.78 G0 NO 202117.43+025021.9
20213+0250 HLD 158 2007 63 44 1.1 9.71 9.78 G0 NO 202117.43+025021.9
20213+0250 HLD 158 2015 64 144 0.2 9.71 9.78 G0 NO 202117.43+025021.9
20213+0250 HLD 158 2016 65 42 1.2 9.71 9.78 G0 NO 202117.43+025021.9
20213+0250 HLD 158 2017 68 42 1.2 9.71 9.78 G0 NO 202117.43+025021.9

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