16256-2327 H 2  19AB (Rho Oph)

 
 
16h 25m 35.03s -23 26' 47.0" P.A. 336.8 sep 2.86 mag 5.07,5.74 Sp B2IV+B2V dist. 110.74 pc (361.23 l.y.)
 
 
Coord 2000
16256-2327
Discov num
H 2  19
Comp
AB
Coord arcsec 2000
16 25 35.03 -23 26 47.0
Date first
1832
Date last
2017
Obs
108
Pa first
3
Pa last
334
P.A. Now (θ)
336.8°
Sep first
3.8
Sep last
3.0
Sep. Now (ρ)
2.86"
Mag pri
5.07
Mag sec
5.74
delta mag (ΔM)
0.67
Spectral class
B2IV+B2V (blue-white/blue-white)
Pri motion ra
-014
Sec motion ra
-014
Pri motion dec
-027
Sec motion dec
-027
Notes
N C (See Notes, Has orbit and linear solution)
This double is physical.
 
 
16256-2327 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Rho Oph 184382 16256-2327 H 2 19 AB 1832 2017 108 337 2.9 5.07 5.74 0.67 Y <===
Show 16256-2327 H 2 19 AC 1846 2000 15 0 149.2 5.07 7.29 2.22
Show 16256-2327 H 2 19 AD 1846 2000 16 252 156.4 5.07 6.81 1.74
Show 16256-2327 KOU 63 CF 2000 2000 1 206 4.8 5.80 11.70 5.90
Show 16256-2327 BU 1115 DE 1889 2018 21 200 0.3 6.81 8.42 1.61 Y
Sextuple system
6 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
334.1
Precise sep
3.023
Name
Rho Oph
Constellation
Ophiuchus
SAO
184382
HIP
80473
Tycho2
6794-00549-1
Gaia DR2
10590451328
HD
147933
HR
6112
GC
22079
ADS
10049
CD
CD-2312861
Bayer
Rho Ophiuchi
Bayer name
Rho Oph
Flamsteed
5 Ophiuchi
Flamsteed name
5 Oph
Distance
110.74
Distance ly
361.23
last precise pa
334.1
last precise sep
3.023
 
 
ORBITAL ELEMENTS
 
 
Period (P)2398y± 326 Periastron (T)2327y± 343 Semi-major axis (a)4.25a± 0.79
Eccentricity (e)0.675± 0.322 Inclination (i)135.3°± 6 Longitude of periastron (ω)226.1°± 15.3
Node (Ω)77.5°± 13.5 Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation2001
label rho theta
2000 2.953 340.0
2001 2.948 339.8
2002 2.943 339.7
2003 2.938 339.5
2004 2.933 339.4
2005 2.928 339.2
2006 2.923 339.0
2007 2.918 338.9
2008 2.913 338.7
2009 2.908 338.5
2010 2.903 338.4
2011 2.898 338.2
2012 2.893 338.0
2013 2.888 337.8
2014 2.883 337.7
2015 2.879 337.5
2016 2.874 337.3
2017 2.869 337.2
2018 2.864 337.0
2019 2.859 336.8
2020 2.854 336.6
2021 2.849 336.5
2022 2.844 336.3
2023 2.839 336.1
2024 2.834 335.9
2025 2.829 335.8
2026 2.824 335.6
2027 2.820 335.4
2028 2.815 335.2
2029 2.810 335.0
2030 2.805 334.9

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






wds16256-2327c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
16256-2327 H 2 19 AB 2007 103 337 3.3 5.07 5.74 B2IV B2V NCD 162535.12-232649.6
16256-2327 H 2 19 AB 2009 104 334 3.3 5.07 5.74 B2IV B2V NCD 162535.12-232649.6
16256-2327 H 2 19 AB 2012 104 336 3.0 5.07 5.74 B2IV+B2V NCD 162535.12-232649.6
16256-2327 H 2 19 AB 2016 106 338 3.2 5.07 5.74 B2IV+B2V NC 162535.03-232647.0
16256-2327 H 2 19 AB 2017 108 334 3.0 5.07 5.74 B2IV+B2V NC 162535.03-232647.0

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