17031-5314 HDS 2412 Aa,Ab (Eps2 Ara)

 
 
17h 03m 08.76s -53° 14' 13.1" P.A. 151.00 sep 0.7 mag 5.44,8.65 Sp F5V dist. 27.23 pc (88.82 l.y.)
 
 
Coord 2000 17031-5314 Discov num HDS2412 Comp Aa,Ab Coord arcsec 2000 17 03 08.76 -53 14 13.1
Date first 1991 Date last 2021 Obs 29
Pa first 109 Pa last 151.3 P.A. Now (θ) 151.3°
Sep first 0.6 Sep last 0.678 Sep. Now (ρ) 0.678"
Mag pri 5.44 Mag sec 8.65 delta mag (ΔM) 3.21 Spectral class F5V (yellow-white)
Pri motion ra -017 Sec motion ra
Pri motion dec -118 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
17031-5314 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Eps2 Ara 244388 17 03 09 -53 14 13 HDS 2412 Aa,Ab 2021 29 151 0.7 5.44 8.65 3.21 Y <===
Show 244388 17 03 09 -53 14 13 HDO 263 AB 1999 2 18 46.1 5.33 13.85 8.52
Show 244388 17 03 09 -53 14 13 SKF 103 AC 2015 3 258 113.6 5.33 13.48 8.15
Quadruple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Eps2 Ara Constellation Ara SAO 244388 HIP 83431
Tycho2 8726-02209-1 Gaia DR2 5923907314622859520 HD 153580 HR 6314
GC 22956 GL NN 3985 CP CP-53 8316 Bayer Epsilon 2 Arae
Bayer name Eps2 Ara Distance 27.23 Distance ly 88.82 Bayer greek ε2 Ara
 
 
ORBITAL ELEMENTS
 
 
Period (P)41.32y Periastron (T)1999.45y Semi-major axis (a)0.589a
Eccentricity (e)0.622 Inclination (i)133.8° Longitude of periastron (ω)94.1°
Node (Ω)73.6° Notesn ReferenceCve2013b
Equinox2000 Last observation2012 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 304.1 0.180
2001 270.1 0.270
2002 252.9 0.350
2003 241.5 0.411
2004 232.9 0.457
2005 225.6 0.493
2006 219.3 0.522
2007 213.5 0.546
2008 208.2 0.565
2009 203.3 0.582
2010 198.5 0.596
2011 194.0 0.608
2012 189.6 0.618
2013 185.4 0.627
2014 181.3 0.634
2015 177.3 0.641
2016 173.3 0.647
2017 169.4 0.652
2018 165.6 0.656
2019 161.8 0.660
2020 158.1 0.663
2021 154.4 0.665
2022 150.7 0.666
2023 147.0 0.666
2024 143.3 0.665
2025 139.6 0.664
2026 135.9 0.660
2027 132.1 0.656
2028 128.2 0.650
2029 124.3 0.641
2030 120.2 0.631


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



 
 


wds17031-5314a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic