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° | |
Notes | n | |
Reference | Cve2013b | |
Equinox | 2000 | |
Last observation | 2012 | |
Grade | 4 | (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 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
|
|
|
|
|
|
|
|
Measures: green=micrometric, blue=interferometric, purple=photographic |
|