20325-1637 SEE 512

 
 
20h 32m 31.57s -16 36' 34.4" P.A. 126.9 sep 0.29 mag 7.94,8.04 Sp A7III+F0 dist. 102.88 pc (335.59 l.y.)
 
 
Coord 2000
20325-1637
Discov num
SEE 512
Comp
Coord arcsec 2000
20 32 31.57 -16 36 34.4
Date first
1897
Date last
2017
Obs
37
Pa first
120
Pa last
130
P.A. Now (θ)
126.9°
Sep first
0.4
Sep last
0.2
Sep. Now (ρ)
0.29"
Mag pri
7.94
Mag sec
8.04
delta mag (ΔM)
0.1
Spectral class
A7III+F0 (white/yellow-white)
Pri motion ra
+057
Sec motion ra
Pri motion dec
-012
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
129.5
Precise sep
0.245
Constellation
Capricornus
SAO
163666
HIP
101357
Tycho2
6330-01597-1
HD
195536
ADS
13961
BD
BD-17 6014
Distance
102.88
Distance ly
335.59
last precise pa
129.5
last precise sep
0.245
 
 
ORBITAL ELEMENTS
 
 
Period (P)82.18y± 0.2 Periastron (T)1996.66y± 0.1 Semi-major axis (a)0.29a± 0.003
Eccentricity (e)0.031± 0.004 Inclination (i)99.5°± 2 Longitude of periastron (ω)252.2°± 10
Node (Ω)125.8°± 3.5 Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2007
label rho theta
2000 0.048 229.1
2001 0.048 201.5
2002 0.058 178.9
2003 0.073 164.4
2004 0.091 155.2
2005 0.110 149.2
2006 0.129 144.9
2007 0.148 141.7
2008 0.166 139.2
2009 0.184 137.2
2010 0.200 135.6
2011 0.216 134.2
2012 0.230 133.0
2013 0.243 131.9
2014 0.255 130.9
2015 0.265 130.0
2016 0.273 129.2
2017 0.280 128.4
2018 0.286 127.6
2019 0.290 126.9
2020 0.292 126.1
2021 0.293 125.4
2022 0.292 124.7
2023 0.289 124.0
2024 0.285 123.3
2025 0.279 122.5
2026 0.272 121.7
2027 0.263 120.9
2028 0.253 120.0
2029 0.242 119.0
2030 0.230 117.9

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






wds20325-1637a.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
20325-1637 SEE 512 2005 32 145 0.1 7.94 8.04 A7III NOD 203231.57-163634.4
20325-1637 SEE 512 2008 34 137 0.2 7.94 8.04 A7III NOD 203231.57-163634.4
20325-1637 SEE 512 2017 37 130 0.2 7.94 8.04 A7III+F0 NO 203231.57-163634.4

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