19180+2012 COU 321 (HD 181025)

 
 
19h 17m 57.89s +20° 11' 33.7" P.A. 141.00 sep 0.1 mag 8.92,8.92 Sp A5 dist. 135.32 pc (441.41 l.y.)
 
 
Coord 2000 19180+2012 Discov num COU 321 Comp Coord arcsec 2000 19 17 57.89 +20 11 33.7
Date first 1968 Date last 2013 Obs 33
Pa first 133 Pa last 140.7 P.A. Now (θ) 140.7°
Sep first 0.2 Sep last 0.107 Sep. Now (ρ) 0.107"
Mag pri 8.92 Mag sec 8.92 delta mag (ΔM) 0 Spectral class A5 (white)
Pri motion ra +005 Sec motion ra
Pri motion dec -026 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 181025 Constellation Sagitta SAO 87042 HIP 94847
Tycho2 1607-00274-1 Gaia DR2 4516634578236919040 HD 181025 BD BD+19 3972
Distance 135.32 Distance ly 441.41
 
 
ORBITAL ELEMENTS
 
 
Period (P)354.12y± 20 Periastron (T)2349.4y± 2 Semi-major axis (a)0.484a± 0.02
Eccentricity (e)0.776± 0.1 Inclination (i)101°± 2 Longitude of periastron (ω)188.4°± 5
Node (Ω)142.2°± 3 Notesn ReferenceDoc2003e
Equinox2000 Last observation1998 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 303.0 0.067
2001 295.2 0.055
2002 283.4 0.044
2003 265.2 0.036
2004 240.1 0.033
2005 215.0 0.036
2006 196.7 0.044
2007 185.0 0.055
2008 177.3 0.068
2009 172.1 0.081
2010 168.3 0.094
2011 165.5 0.107
2012 163.3 0.120
2013 161.5 0.133
2014 160.0 0.146
2015 158.8 0.159
2016 157.7 0.172
2017 156.8 0.184
2018 156.0 0.196
2019 155.3 0.208
2020 154.7 0.220
2021 154.1 0.231
2022 153.6 0.243
2023 153.2 0.254
2024 152.7 0.265
2025 152.3 0.276
2026 152.0 0.286
2027 151.6 0.297
2028 151.3 0.307
2029 151.0 0.317
2030 150.8 0.327


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



 
 


wds19180%2B2012b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic