20231+2052 A   288

 
 
20h 23m 08.98s +20 51' 51.1" P.A. 306.1 sep 0.22 mag 8.72,8.98 Sp F2 dist. 251.89 pc (821.67 l.y.)
 
 
Coord 2000
20231+2052
Discov num
A   288
Comp
Coord arcsec 2000
20 23 08.98 +20 51 51.1
Date first
1901
Date last
2006
Obs
39
Pa first
352
Pa last
279
P.A. Now (θ)
306.1°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.22"
Mag pri
8.72
Mag sec
8.98
delta mag (ΔM)
0.26
Spectral class
F2 (yellow-white)
Pri motion ra
+012
Sec motion ra
Pri motion dec
+005
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
278.9
Precise sep
0.19
Constellation
Delphinus
SAO
88610
HIP
100536
Tycho2
1643-02278-1
HD
194113
ADS
13777
BD
BD+20 4541
Distance
251.89
Distance ly
821.67
last precise pa
278.9
last precise sep
0.19
 
 
ORBITAL ELEMENTS
 
 
Period (P)163.2y Periastron (T)1979.2y Semi-major axis (a)0.206a
Eccentricity (e)0.533 Inclination (i)30° Longitude of periastron (ω)138.6°
Node (Ω)24.5° Note Grade3(1=Definitive, 9=Indet.)
Equinox Last observation1991
label rho theta
2000 0.158 269.0
2001 0.162 271.7
2002 0.165 274.3
2003 0.168 276.7
2004 0.172 279.1
2005 0.175 281.4
2006 0.179 283.6
2007 0.182 285.7
2008 0.185 287.7
2009 0.189 289.7
2010 0.192 291.6
2011 0.195 293.4
2012 0.199 295.2
2013 0.202 296.9
2014 0.205 298.6
2015 0.208 300.2
2016 0.211 301.7
2017 0.214 303.2
2018 0.217 304.7
2019 0.220 306.1
2020 0.223 307.5
2021 0.226 308.9
2022 0.229 310.2
2023 0.232 311.5
2024 0.235 312.8
2025 0.237 314.0
2026 0.240 315.2
2027 0.243 316.4
2028 0.245 317.5
2029 0.248 318.7
2030 0.250 319.8

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






wds20231%2B2052a.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
20231+2052 A 288 1998 38 87 0.2 8.72 8.98 F2 NO 202308.98+205151.1
20231+2052 A 288 2006 39 279 0.2 8.72 8.98 F2 NO 202308.98+205151.1

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