00164-7024 HEI 198 (HD 1261)

 
 
00h 16m 24.38s -70° 23' 32.6" P.A. 174.00 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 2022 Obs 13
Pa first 128 Pa last 173.6 P.A. Now (θ) 160.5° (calc)
Sep first 0.2 Sep last 0.12 Sep. Now (ρ) 0.135" (calc)
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)52.4y Periastron (T)2012.33y Semi-major axis (a)0.1122a
Eccentricity (e)0.483 Inclination (i)144.9° Longitude of periastron (ω)238°
Node (Ω)176.3° Notes ReferenceMsn2023
Equinox Last observation Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 71.2 0.109
2001 65.8 0.105
2002 60.0 0.102
2003 53.7 0.098
2004 47.0 0.094
2005 39.7 0.090
2006 31.8 0.086
2007 23.0 0.082
2008 13.2 0.077
2009 1.8 0.071
2010 348.4 0.065
2011 332.0 0.058
2012 311.4 0.052
2013 286.8 0.049
2014 261.4 0.051
2015 239.7 0.057
2016 223.0 0.066
2017 210.4 0.075
2018 200.7 0.085
2019 192.9 0.094
2020 186.4 0.102
2021 180.9 0.109
2022 176.0 0.116
2023 171.6 0.122
2024 167.6 0.127
2025 163.9 0.132
2026 160.5 0.135
2027 157.2 0.139
2028 154.0 0.141
2029 151.0 0.144
2030 148.0 0.145
2031 145.1 0.147
2032 142.2 0.148
2033 139.4 0.148
2034 136.6 0.148
2035 133.8 0.148
2036 131.0 0.148
2037 128.1 0.147
2038 125.2 0.146
2039 122.3 0.145
2040 119.3 0.143
2041 116.2 0.141
2042 113.1 0.139
2043 109.8 0.137
2044 106.4 0.134
2045 103.0 0.132
2046 99.3 0.129
2047 95.5 0.126
2048 91.5 0.123
2049 87.3 0.120
2050 82.9 0.117


 
grafico orbita
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
wds00164-7024a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic