21051+0757 HDS 3004 AB

 
 
21h 05m 07.95s +07° 56' 44.4" P.A. 252.00 sep 0.3 mag 7.98,11.81 Sp G5 dist. 50.35 pc (164.24 l.y.)
 
 
Coord 2000 21051+0757 Discov num HDS3004 Comp AB Coord arcsec 2000 21 05 07.95 +07 56 44.4
Date first 1991 Date last 2021 Obs 22
Pa first 309 Pa last 252 P.A. Now (θ) 252°
Sep first 0.4 Sep last 0.264 Sep. Now (ρ) 0.264"
Mag pri 7.98 Mag sec 11.81 delta mag (ΔM) 3.83 Spectral class G5 (yellow)
Pri motion ra +005 Sec motion ra
Pri motion dec -089 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
21051+0757 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 126530 21 05 08 +07 56 44 HDS 3004 AB 2021 22 252 0.3 7.98 11.81 3.83 Y <===
Show TV Equ 126530 21 05 08 +07 56 44 MET 90 AC 2003 1 354 4.3 6.39 17.59 11.20
Show 126530 21 05 08 +07 56 44 MET 90 AD 2003 1 166 9.8 6.39 18.09 11.70
Quadruple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Var name TV Equ Constellation Equuleus SAO 126530 HIP 104075
Tycho2 1104-01779-1 Gaia DR2 1737234316120828800 HD 200746 BD BD+07 4621
Distance 50.35 Distance ly 164.24
 
 
ORBITAL ELEMENTS
 
 
Period (P)80.42y± 163.73 Periastron (T)2016.78y± 1.39 Semi-major axis (a)0.463a± 0.326
Eccentricity (e)0.691± 0.062 Inclination (i)58°± 21.2 Longitude of periastron (ω)48.7°± 63.5
Node (Ω)88.1°± 32.2 Notes ReferenceTok2015c
Equinox2000 Last observation2014 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 341.4 0.318
2001 345.2 0.304
2002 349.3 0.290
2003 353.9 0.277
2004 358.9 0.265
2005 4.4 0.253
2006 10.4 0.243
2007 16.9 0.234
2008 23.8 0.226
2009 31.2 0.220
2010 39.0 0.215
2011 47.2 0.210
2012 55.7 0.205
2013 64.7 0.199
2014 74.4 0.189
2015 85.7 0.171
2016 100.8 0.141
2017 126.4 0.102
2018 173.3 0.084
2019 214.9 0.113
2020 235.0 0.163
2021 245.5 0.214
2022 252.0 0.261
2023 256.7 0.304
2024 260.2 0.342
2025 263.0 0.377
2026 265.4 0.408
2027 267.5 0.436
2028 269.3 0.462
2029 270.9 0.485
2030 272.4 0.506


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



 
 


wds21051%2B0757a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic