19581-4808 HDS 2842 (HD 188581)

 
 
19h 58m 04.28s -48 08' 01.2" P.A. 76.00 sep 0.3 mag 8.61,10.78 Sp G0V dist. 53.79 pc (175.46 l.y.)
 
 
Coord 2000 19581-4808 Discov num HDS2842 Comp Coord arcsec 2000 19 58 04.28 -48 08 01.2
Date first 1991 Date last 2021 Obs 14
Pa first 92 Pa last 76.4 P.A. Now (θ) 76.4°
Sep first 0.3 Sep last 0.253 Sep. Now (ρ) 0.253"
Mag pri 8.61 Mag sec 10.78 delta mag (ΔM) 2.17 Spectral class G0V (yellow)
Pri motion ra +052 Sec motion ra
Pri motion dec +016 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 188581 Constellation Telescopium SAO 229955 HIP 98274
Tycho2 8395-00655-1 Gaia DR2 6670759761800880768 HD 188581 CD CD-4813359
CP CP-4810294 Distance 53.79 Distance ly 175.46
 
 
ORBITAL ELEMENTS
 
 
Period (P)35.28y± 2.48 Periastron (T)2016.036y± 0.065 Semi-major axis (a)0.2364a± 0.014
Eccentricity (e)0.738± 0.037 Inclination (i)70.2°± 2.2 Longitude of periastron (ω)60.6°± 4.1
Node (Ω)254.2°± 2.4 Notes ReferenceTok2016e
Equinox2000 Last observation Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 109.3 0.217
2001 112.2 0.204
2002 115.6 0.191
2003 119.5 0.177
2004 124.0 0.163
2005 129.4 0.149
2006 135.9 0.135
2007 143.9 0.122
2008 153.6 0.110
2009 165.3 0.101
2010 178.8 0.096
2011 193.3 0.094
2012 207.8 0.096
2013 221.4 0.099
2014 234.4 0.101
2015 248.4 0.089
2016 281.7 0.038
2017 55.3 0.067
2018 69.6 0.132
2019 75.1 0.176
2020 78.6 0.209
2021 81.3 0.232
2022 83.5 0.249
2023 85.5 0.262
2024 87.3 0.270
2025 89.1 0.275
2026 90.8 0.278
2027 92.5 0.278
2028 94.2 0.276
2029 95.9 0.273
2030 97.7 0.267


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



 
 


wds19581-4808b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic