15122-1948 B  2351Aa,Ab

 
 
15H 12M 13.31S -19 47' 29.9" P.A. 192.5 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
2015
Obs
67
Pa first
342
Pa last
259
P.A. Now (θ)
192.5°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.1"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 159090 15122-1948 B 2351 Aa,Ab 1940 2015 67 192 0.1 5.10 5.50 0.40 Y <===
Show Iot Lib 159090 15122-1948 H 6 44 AB 1781 2013 29 111 57.8 4.53 10.87 6.34
Show 159091 15122-1948 BU 618 BC 1878 2015 20 11 2.4 10.87 11.40 0.53
Quadruple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Libra
SAO
159090
HIP
74392
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
Distance
116.41
Distance ly
379.73
last precise pa
259.1
last precise sep
0.099
 
 
ORBITAL ELEMENTS
 
 
Period (P)23.46y Periastron (T)1971.13y Semi-major axis (a)0.129a
Eccentricity (e)0.244 Inclination (i)154.2° Longitude of periastron (ω)341.5°
Node (Ω)174.5° Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation2009
label rho theta
2000 0.120 82.0
2001 0.128 67.4
2002 0.136 54.5
2003 0.143 43.1
2004 0.150 32.7
2005 0.155 23.2
2006 0.158 14.1
2007 0.159 5.3
2008 0.158 356.5
2009 0.155 347.4
2010 0.149 337.8
2011 0.141 327.3
2012 0.132 315.3
2013 0.121 301.4
2014 0.110 284.7
2015 0.101 264.7
2016 0.096 241.6
2017 0.095 216.9
2018 0.096 192.5
2019 0.099 169.1
2020 0.102 147.1
2021 0.105 126.3
2022 0.110 106.9
2023 0.116 89.4
2024 0.124 73.9
2025 0.132 60.3
2026 0.140 48.2
2027 0.147 37.4
2028 0.153 27.5
2029 0.157 18.2
2030 0.159 9.3

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