17121+2114 STF 2135 AB (HD 155642)

 
 
17h 12m 06.06s +21° 13' 44.4" P.A. 194.00 sep 8.7 mag 7.59,8.88 Sp K0 dist. 152.44 pc (497.26 l.y.)
 
 
Coord 2000 17121+2114 Discov num STF2135 Comp AB Coord arcsec 2000 17 12 06.06 +21 13 44.4
Date first 1829 Date last 2018 Obs 170
Pa first 166 Pa last 194.2 P.A. Now (θ) 194.2°
Sep first 6.7 Sep last 8.694 Sep. Now (ρ) 8.694"
Mag pri 7.59 Mag sec 8.88 delta mag (ΔM) 1.29 Spectral class K0 (yellow-orange)
Pri motion ra +022 Sec motion ra -001
Pri motion dec +002 Sec motion dec -011
Notes C (Has orbit and linear solution)
rPM=1.196
This double is physical.
 
 
17121+2114 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 155642 84910 17 12 06 +21 13 44 STF 2135 AB 2018 170 194 8.7 7.59 8.88 1.29 Y <===
Show 84910 17 12 06 +21 13 44 STF 2135 AC 2015 7 208 162.1 7.59 12.91 5.32
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 155642 Constellation Hercules SAO 84910 HIP 84137
Tycho2 1548-00181-1 Gaia DR2 4567068631146723456 HD 155642 GC 23216
BD BD+21 3063 Distance 152.44 Distance ly 497.26
 
 
ORBITAL ELEMENTS
 
 
Period (P)2228.9851y± 935.2933 Periastron (T)2283.7475y± 168.9042 Semi-major axis (a)23.83872a± 12.08057
Eccentricity (e)0.80812± 0.151 Inclination (i)80.053°± 7.727 Longitude of periastron (ω)252.621°± 27.491
Node (Ω)40.759°± 7.512 Notes ReferenceIzm2019
Equinox Last observation2015 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 192.0 8.412
2001 192.2 8.425
2002 192.3 8.438
2003 192.4 8.452
2004 192.6 8.465
2005 192.7 8.478
2006 192.8 8.491
2007 192.9 8.504
2008 193.1 8.517
2009 193.2 8.530
2010 193.3 8.543
2011 193.5 8.555
2012 193.6 8.568
2013 193.7 8.581
2014 193.8 8.594
2015 194.0 8.607
2016 194.1 8.620
2017 194.2 8.632
2018 194.3 8.645
2019 194.5 8.658
2020 194.6 8.670
2021 194.7 8.683
2022 194.8 8.696
2023 195.0 8.708
2024 195.1 8.721
2025 195.2 8.733
2026 195.3 8.746
2027 195.4 8.758
2028 195.6 8.771
2029 195.7 8.783
2030 195.8 8.795


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



 
 


wds17121%2B2114a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic