20269-3724 R   321

 
 
20h 26m 52.97s -37 24' 10.6" P.A. 122.1 sep 1.58 mag 6.58,8.09 Sp K2IV+K1V dist. 37.33 pc (121.77 l.y.)
 
 
Coord 2000
20269-3724
Discov num
R   321
Comp
Coord arcsec 2000
20 26 52.97 -37 24 10.6
Date first
1880
Date last
2017
Obs
69
Pa first
97
Pa last
124
P.A. Now (θ)
122.1°
Sep first
1.1
Sep last
1.6
Sep. Now (ρ)
1.58"
Mag pri
6.58
Mag sec
8.09
delta mag (ΔM)
1.51
Spectral class
K2IV+K1V (yellow-orange/yellow-orange)
Pri motion ra
-249
Sec motion ra
-249
Pri motion dec
-114
Sec motion dec
-114
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
123.8
Precise sep
1.579
Constellation
Sagittarius
SAO
212126
HIP
100852
Tycho2
7467-01373-1
Gaia DR2
55167180160
HD
194433
HR
7808
CD
CD-3713741
Distance
37.33
Distance ly
121.77
last precise pa
123.8
last precise sep
1.579
 
 
ORBITAL ELEMENTS
 
 
Period (P)177.5y Periastron (T)1949.5y Semi-major axis (a)1.045a
Eccentricity (e)0.67 Inclination (i)140° Longitude of periastron (ω)223°
Node (Ω)148° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation1986
label rho theta
2000 1.469 132.2
2001 1.479 131.7
2002 1.488 131.1
2003 1.497 130.5
2004 1.505 130.0
2005 1.513 129.4
2006 1.521 128.9
2007 1.528 128.3
2008 1.535 127.8
2009 1.541 127.2
2010 1.547 126.7
2011 1.553 126.2
2012 1.558 125.7
2013 1.563 125.2
2014 1.567 124.6
2015 1.571 124.1
2016 1.575 123.6
2017 1.578 123.1
2018 1.581 122.6
2019 1.583 122.1
2020 1.586 121.6
2021 1.587 121.1
2022 1.589 120.6
2023 1.590 120.1
2024 1.591 119.6
2025 1.592 119.1
2026 1.592 118.6
2027 1.592 118.1
2028 1.591 117.6
2029 1.590 117.1
2030 1.589 116.6

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






wds20269-3724a.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
20269-3724 R 321 1999 59 134 1.5 6.58 8.09 K2IV K1V NOD 202652.97-372410.6
20269-3724 R 321 2008 60 128 1.5 6.58 8.09 K2IV K1V NOD 202652.97-372410.6
20269-3724 R 321 2013 63 126 1.6 6.58 8.09 K2IV K1V NO 202652.97-372410.6
20269-3724 R 321 2016 67 128 1.7 6.58 8.09 K2IV+K1V O 202652.97-372410.6

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