17577-2143 HDS 2530

 
 
17h 57m 40.96s -21° 43' 09.5" P.A. 179.00 sep 0.6 mag 10.21,12.68 Sp K3/K4V dist. 31.81 pc (103.76 l.y.)
 
 
Coord 2000 17577-2143 Discov num HDS2530 Comp Coord arcsec 2000 17 57 40.96 -21 43 09.5
Date first 1991 Date last 2019 Obs 8
Pa first 297 Pa last 179.4 P.A. Now (θ) 179.4°
Sep first 0.4 Sep last 0.558 Sep. Now (ρ) 0.558"
Mag pri 10.21 Mag sec 12.68 delta mag (ΔM) 2.47 Spectral class K3/K4V (yellow-orange)
Pri motion ra +024 Sec motion ra
Pri motion dec -162 Sec motion dec
Notes O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Sagittarius HIP 87925 Tycho2 6262-00252-3 Gaia DR2 4070388266455534720
HD 163573 BD BD-21 4791 Distance 31.81 Distance ly 103.76
 
 
ORBITAL ELEMENTS
 
 
Period (P)59.9y± 2.1 Periastron (T)1998.25y± 0.56 Semi-major axis (a)0.514a± 0.013
Eccentricity (e)0.608± 0.019 Inclination (i)58.9°± 1.6 Longitude of periastron (ω)250.9°± 2.3
Node (Ω)143.7°± 2.6 Notes ReferenceTok2019c
Equinox Last observation2018 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 102.1 0.156
2001 120.7 0.225
2002 130.7 0.288
2003 137.3 0.343
2004 142.1 0.389
2005 146.0 0.427
2006 149.3 0.459
2007 152.3 0.485
2008 154.9 0.507
2009 157.3 0.524
2010 159.7 0.538
2011 161.9 0.549
2012 164.0 0.557
2013 166.1 0.563
2014 168.1 0.567
2015 170.1 0.569
2016 172.1 0.569
2017 174.1 0.568
2018 176.2 0.565
2019 178.2 0.561
2020 180.3 0.556
2021 182.4 0.549
2022 184.6 0.542
2023 186.9 0.535
2024 189.2 0.526
2025 191.6 0.517
2026 194.1 0.508
2027 196.6 0.498
2028 199.3 0.488
2029 202.1 0.477
2030 205.0 0.467


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



 
 


wds17577-2143a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic