00164-7024 HEI 198 (HD 1261)

 
 
00h 16m 24.38s -70 23' 32.6" P.A. 178.00 sep 0.1 mag 7.80,8.26 Sp F8V dist. 193.05 pc (629.73 l.y.)
 
 
Coord 2000 00164-7024 Discov num HEI 198 Comp Coord arcsec 2000 00 16 24.38 -70 23 32.6
Date first 1983 Date last 2021 Obs 12
Pa first 128 Pa last 177.9 P.A. Now (θ) 177.9°
Sep first 0.2 Sep last 0.113 Sep. Now (ρ) 0.113"
Mag pri 7.80 Mag sec 8.26 delta mag (ΔM) 0.46 Spectral class F8V (yellow-white)
Pri motion ra -001 Sec motion ra
Pri motion dec +002 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 1261 Constellation Tucana SAO 255651 HIP 1309
Tycho2 9137-00628-1 Gaia DR2 4702206375497204992 HD 1261 GC 319
CP CP-71 4 Distance 193.05 Distance ly 629.73
 
 
ORBITAL ELEMENTS
 
 
Period (P)63.3y± 30.8 Periastron (T)2010.7y± 2.7 Semi-major axis (a)0.166a± 0.072
Eccentricity (e)0.42± 0.15 Inclination (i)121.6°± 15 Longitude of periastron (ω)210°± 25.5
Node (Ω)153.2°± 10.6 Notes ReferenceTok2017b
Equinox2000 Last observation Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 44.7 0.087
2001 34.8 0.087
2002 25.2 0.089
2003 16.1 0.092
2004 7.7 0.095
2005 359.8 0.099
2006 352.4 0.102
2007 345.3 0.103
2008 338.2 0.102
2009 330.9 0.099
2010 322.8 0.093
2011 313.3 0.084
2012 301.5 0.074
2013 286.1 0.065
2014 266.5 0.059
2015 244.8 0.059
2016 225.0 0.065
2017 209.6 0.075
2018 198.3 0.088
2019 190.0 0.102
2020 183.7 0.115
2021 178.6 0.129
2022 174.5 0.141
2023 171.1 0.153
2024 168.1 0.164
2025 165.5 0.174
2026 163.1 0.182
2027 161.0 0.190
2028 159.0 0.198
2029 157.2 0.204
2030 155.4 0.209


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



 
 


wds00164-7024e.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic