20269-3724 R   321

 
 
20h 26m 52.97s -37 24' 10.6" P.A. 123.20 sep 1.6 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)
123.2°
Sep first
1.1
Sep last
1.6
Sep. Now (ρ)
1.59"
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)
Visually invisible, K-band or other infrared star 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)186.4192y± 5.9398 Periastron (T)1949.1982y± 0.1812 Semi-major axis (a)1.06149a± 0.01098
Eccentricity (e)0.69564± 0.00946 Inclination (i)139.301°± 1.541 Longitude of periastron (ω)227.418°± 2.218
Node (Ω)152.349°± 1.626 Note Grade3(1=Definitive, 9=Indet.)
Equinox Last observation2013
label rho theta
2000 1.469 133.2
2001 1.479 132.7
2002 1.488 132.1
2003 1.497 131.6
2004 1.506 131.1
2005 1.514 130.5
2006 1.522 130.0
2007 1.529 129.5
2008 1.536 129.0
2009 1.543 128.5
2010 1.549 128.0
2011 1.555 127.5
2012 1.560 127.0
2013 1.565 126.6
2014 1.570 126.1
2015 1.575 125.6
2016 1.579 125.1
2017 1.583 124.6
2018 1.586 124.2
2019 1.589 123.7
2020 1.592 123.2
2021 1.595 122.8
2022 1.597 122.3
2023 1.599 121.8
2024 1.600 121.4
2025 1.602 120.9
2026 1.603 120.5
2027 1.603 120.0
2028 1.604 119.5
2029 1.604 119.1
2030 1.604 118.6

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






wds20269-3724b.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
20269-3724 R 321 2017 69 124 1.6 6.58 8.09 K2IV+K1V O 202652.97-372410.6

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