17400-0038 BU  631

 
 
17H 39M 57.70S -00 38' 21.2" P.A. 77.8 SEP 0.32 MAG 7.23,7.40 SP B9IV DIST. 245.7 PC (801.47 L.Y.)
 
 
Coord 2000
17400-0038
Discov num
BU  631
Comp
Coord arcsec 2000
17 39 57.70 -00 38 21.2
Date first
1878
Date last
2009
Obs
121
Pa first
70
Pa last
90
P.A. Now (θ)
77.8°
Sep first
0.4
Sep last
0.3
Sep. Now (ρ)
0.32"
Mag pri
7.23
Mag sec
7.40
delta mag (ΔM)
0.17
Spectral class
B9IV (blue-white)
Pri motion ra
-008
Sec motion ra
Pri motion dec
-016
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Ophiuchus
SAO
141795
HIP
86463
HD
160438
ADS
10696
Distance
245.7
Distance ly
801.47
last precise pa
90.3
last precise sep
0.255
 
 
ORBITAL ELEMENTS
 
 
Period (P)147.5y Periastron (T)1978.3y Semi-major axis (a)0.217a
Eccentricity (e)0.78 Inclination (i)162.5° Longitude of periastron (ω)146°
Node (Ω)26.8° Note Grade2(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.229 94.2
2001 0.235 93.0
2002 0.241 91.8
2003 0.247 90.6
2004 0.253 89.5
2005 0.259 88.5
2006 0.264 87.5
2007 0.269 86.5
2008 0.275 85.6
2009 0.280 84.7
2010 0.284 83.8
2011 0.289 83.0
2012 0.294 82.2
2013 0.298 81.4
2014 0.302 80.6
2015 0.306 79.9
2016 0.310 79.2
2017 0.314 78.5
2018 0.318 77.8
2019 0.322 77.1
2020 0.325 76.5
2021 0.329 75.8
2022 0.332 75.2
2023 0.335 74.6
2024 0.338 74.0
2025 0.341 73.4
2026 0.344 72.8
2027 0.346 72.2
2028 0.349 71.6
2029 0.352 71.1
2030 0.354 70.5

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