19197-2836 B 433 AB (HD 180957)

 
 
19h 19m 39.44s -28° 36' 18.8" P.A. 276.00 sep 0.1 mag 9.89,10.08 Sp G1V dist. 119.05 pc (388.34 l.y.)
 
 
Coord 2000 19197-2836 Discov num B   433 Comp AB Coord arcsec 2000 19 19 39.44 -28 36 18.8
Date first 1926 Date last 2021 Obs 14
Pa first 174 Pa last 276.1 P.A. Now (θ) 276.1°
Sep first 0.4 Sep last 0.135 Sep. Now (ρ) 0.135"
Mag pri 9.89 Mag sec 10.08 delta mag (ΔM) 0.19 Spectral class G1V (yellow)
Pri motion ra -017 Sec motion ra -017
Pri motion dec -027 Sec motion dec -027
Notes O (Orbital solution)
This double is physical.
 
 
19197-2836 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 180957 187969 19 19 39 -28 36 19 B 433 AB 2021 14 276 0.1 9.89 10.08 0.19 Y <===
Show 187969 19 19 39 -28 36 19 B 433 AC 2021 4 54 2.6 10.00 13.60 3.60
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 180957 Constellation Sagittarius SAO 187969 HIP 94985
Tycho2 6887-01586-1 Gaia DR2 6759572538660355840 HD 180957 ADS 12299
CD CD-2815665 CP CP-28 6878 Distance 119.05 Distance ly 388.34
 
 
ORBITAL ELEMENTS
 
 
Period (P)250y Periastron (T)2027.51y Semi-major axis (a)0.441a
Eccentricity (e)0.458 Inclination (i)57.2° Longitude of periastron (ω)97.7°
Node (Ω)219.7° Notes ReferenceTok2020e
Equinox Last observation2019 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 223.7 0.347
2001 224.9 0.340
2002 226.1 0.333
2003 227.3 0.325
2004 228.6 0.317
2005 230.0 0.309
2006 231.4 0.301
2007 233.0 0.292
2008 234.6 0.283
2009 236.4 0.273
2010 238.2 0.263
2011 240.3 0.253
2012 242.4 0.243
2013 244.8 0.233
2014 247.4 0.222
2015 250.3 0.211
2016 253.5 0.201
2017 257.0 0.190
2018 261.0 0.180
2019 265.4 0.170
2020 270.3 0.161
2021 275.8 0.152
2022 282.0 0.144
2023 288.8 0.138
2024 296.1 0.134
2025 303.8 0.131
2026 311.8 0.130
2027 319.7 0.131
2028 327.4 0.134
2029 334.7 0.139
2030 341.4 0.145


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



 
 


wds19197-2836a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic