18581+4711 AG 366 (HD 176465)

 
 
18h 58m 03.46s +47° 11' 30.1" P.A. 183.00 sep 1.4 mag 8.54,8.67 Sp G2V+G8V dist. 49.55 pc (161.63 l.y.)
 
 
Coord 2000 18581+4711 Discov num AG  366 Comp Coord arcsec 2000 18 58 03.46 +47 11 30.1
Date first 1907 Date last 2019 Obs 50
Pa first 229 Pa last 182.6 P.A. Now (θ) 182.6°
Sep first 2.4 Sep last 1.411 Sep. Now (ρ) 1.411"
Mag pri 8.54 Mag sec 8.67 delta mag (ΔM) 0.13 Spectral class G2V+G8V (yellow/yellow)
Pri motion ra -040 Sec motion ra -040
Pri motion dec +012 Sec motion dec +012
Notes N O V (See Notes, Orbital solution, Proper motion indicates physical)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 176465 Constellation Lyra SAO 47960 HIP 93108
Tycho2 3545-01998-1 Gaia DR2 2131416557598645632 HD 176465 BD BD+46 2592
Distance 49.55 Distance ly 161.63
 
 
ORBITAL ELEMENTS
 
 
Period (P)1260.888y Periastron (T)2078.3088y Semi-major axis (a)2.68488a
Eccentricity (e)0.656 Inclination (i)145.5° Longitude of periastron (ω)75.1°
Node (Ω)180.5° Notesn ReferenceWSI2021
Equinox Last observation2018 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 196.1 1.573
2001 195.6 1.563
2002 195.1 1.553
2003 194.5 1.543
2004 194.0 1.534
2005 193.4 1.524
2006 192.9 1.513
2007 192.3 1.503
2008 191.8 1.493
2009 191.2 1.483
2010 190.6 1.473
2011 190.0 1.462
2012 189.4 1.452
2013 188.8 1.442
2014 188.2 1.431
2015 187.5 1.420
2016 186.9 1.410
2017 186.2 1.399
2018 185.6 1.388
2019 184.9 1.377
2020 184.2 1.367
2021 183.5 1.356
2022 182.8 1.345
2023 182.1 1.333
2024 181.4 1.322
2025 180.7 1.311
2026 179.9 1.300
2027 179.1 1.289
2028 178.4 1.277
2029 177.6 1.266
2030 176.8 1.254


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



 
 


wds18581%2B4711a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic