15122-1948 B 2351 Aa,Ab
15h 12m 13.31s -19° 47' 29.9" P.A. 117.00 sep 0.1 mag 5.10,5.50 Sp B9IV dist. 116.41 pc (379.73 l.y.)
| Coord 2000 |
15122-1948 |
|
Discov num |
B 2351 |
|
Comp |
Aa,Ab |
|
Coord arcsec 2000 |
15 12 13.31 -19 47 29.9 |
|
| Date first |
1940 |
|
Date last |
2021 |
|
Obs |
75 |
|
| Pa first |
342 |
|
Pa last |
116.8 |
|
P.A. Now (θ) |
90.5° |
|
| Sep first |
0.2 |
|
Sep last |
0.105 |
|
Sep. Now (ρ) |
0.116" |
|
| Mag pri |
5.10 |
|
Mag sec |
5.50 |
|
delta mag (ΔM) |
0.4 |
|
Spectral class |
B9IV (blue-white) |
|
| Pri motion ra |
-036 |
|
Sec motion ra |
|
|
| Pri motion dec |
-039 |
|
Sec motion dec |
|
|
| Notes |
N
O
(See Notes, Orbital solution) |
|
This double is physical.
15122-1948 SYSTEM COMPONENTS
| Show |
name |
SAO |
coord |
wds_name |
last |
obs |
pa |
sep |
mag1 |
mag2 |
d_mag |
orb |
current |
| Show |
|
159090 |
15 12 13 -19 47 30 |
B 2351 Aa,Ab |
2021 |
75 |
117 |
0.1 |
5.10 |
5.50 |
0.40 |
Y |
<=== |
| Show |
Iot Lib |
159090 |
15 12 13 -19 47 30 |
H 6 44 AB |
2016 |
30 |
111 |
57.7 |
4.53 |
10.87 |
6.34 |
|
|
| Show |
|
|
15 12 17 -19 47 50 |
BU 618 BC |
2016 |
22 |
13 |
2.1 |
10.87 |
11.40 |
0.53 |
|
|
Quadruple system
3 estimated visually detectable stars in this system
OTHER CATALOGS AND DESIGNATIONS
| Var name |
NSV6981 Lib |
|
Constellation |
Libra |
|
SAO |
159090 |
|
HIP |
74392 |
|
| Tycho2 |
6178-01225-1 |
|
Gaia DR2 |
6256039884362600064 |
|
HD |
134759 |
|
HR |
5652 |
|
| GC |
20433 |
|
ADS |
9532 |
|
BD |
BD-19 4047 |
|
Bayer |
Iota Librae |
|
| Bayer name |
Iot Lib |
|
Flamsteed |
24 Librae |
|
Flamsteed name |
24 Lib |
|
FK5 |
559 |
|
| Distance |
116.41 |
|
Distance ly |
379.73 |
|
Bayer greek |
ι Lib |
|
ORBITAL ELEMENTS
| Period (P) | 23.507y | ± 0.03 |
Periastron (T) | 1971.039y | ± 0.083 |
Semi-major axis (a) | 0.129a | ± 0.001 |
| Eccentricity (e) | 0.244 | ± 0.003 |
Inclination (i) | 154.4° | ± 1.1 |
Longitude of periastron (ω) | 340.1° | ± 3.1 |
| Node (Ω) | 173.8° | ± 2.6 |
Notes | n | |
Reference | Msn2021c | |
| Equinox | | |
Last observation | 2021 | |
Grade | 1 | (1=Definitive, 9=Indet.) |
| label |
theta |
rho |
| 2000 |
82.4 |
0.120 |
| 2001 |
67.8 |
0.128 |
| 2002 |
55.0 |
0.136 |
| 2003 |
43.6 |
0.143 |
| 2004 |
33.2 |
0.150 |
| 2005 |
23.6 |
0.155 |
| 2006 |
14.5 |
0.158 |
| 2007 |
5.7 |
0.159 |
| 2008 |
356.9 |
0.158 |
| 2009 |
347.8 |
0.155 |
| 2010 |
338.2 |
0.149 |
| 2011 |
327.7 |
0.142 |
| 2012 |
315.9 |
0.132 |
| 2013 |
302.0 |
0.121 |
| 2014 |
285.4 |
0.111 |
| 2015 |
265.5 |
0.102 |
| 2016 |
242.4 |
0.096 |
| 2017 |
217.7 |
0.095 |
| 2018 |
193.2 |
0.096 |
| 2019 |
169.8 |
0.099 |
| 2020 |
147.8 |
0.102 |
| 2021 |
127.1 |
0.106 |
| 2022 |
107.9 |
0.110 |
| 2023 |
90.5 |
0.116 |
| 2024 |
75.0 |
0.124 |
| 2025 |
61.3 |
0.132 |
| 2026 |
49.2 |
0.140 |
| 2027 |
38.3 |
0.147 |
| 2028 |
28.4 |
0.153 |
| 2029 |
19.1 |
0.157 |
| 2030 |
10.2 |
0.159 |
|
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Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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