17031-5314 HDS2412Aa,Ab

 
 
17H 03M 08.76S -53 14' 13.1" P.A. 165.6 SEP 0.66 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
2015
Obs
11
Pa first
109
Pa last
175
P.A. Now (θ)
165.6°
Sep first
0.6
Sep last
0.6
Sep. Now (ρ)
0.66"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 244388 17031-5314 HDS2412 Aa,Ab 1991 2015 11 166 0.7 5.44 8.65 3.21 Y <===
Show Eps2 Ara 244388 17031-5314 HDO 263 AB 1891 1999 2 18 46.1 5.33 13.85 8.52
Show 244388 17031-5314 SKF 103 AC 1998 1999 2 258 113.7 5.33 13.48 8.15
Quadruple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Ara
SAO
244388
HIP
83431
Tycho2
8726-02209-1
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
last precise pa
175.1
last precise sep
0.648
 
 
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° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2012
label rho theta
2000 0.180 304.1
2001 0.270 270.1
2002 0.350 252.9
2003 0.411 241.5
2004 0.457 232.9
2005 0.493 225.6
2006 0.522 219.3
2007 0.546 213.5
2008 0.565 208.2
2009 0.582 203.3
2010 0.596 198.5
2011 0.608 194.0
2012 0.618 189.6
2013 0.627 185.4
2014 0.634 181.3
2015 0.641 177.3
2016 0.647 173.3
2017 0.652 169.4
2018 0.656 165.6
2019 0.660 161.8
2020 0.663 158.1
2021 0.665 154.4
2022 0.666 150.7
2023 0.666 147.0
2024 0.665 143.3
2025 0.664 139.6
2026 0.660 135.9
2027 0.656 132.1
2028 0.650 128.2
2029 0.641 124.3
2030 0.631 120.2

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic