19531-2528 B 454 (HD 187858)

 
 
19h 53m 08.30s -25 27' 41.2" P.A. 337.00 sep 0.3 mag 8.71,8.87 Sp F8V dist. 89.13 pc (290.74 l.y.)
 
 
Coord 2000 19531-2528 Discov num B   454 Comp Coord arcsec 2000 19 53 08.30 -25 27 41.2
Date first 1926 Date last 2017 Obs 29
Pa first 338 Pa last 336.8 P.A. Now (θ) 337.8°
Sep first 0.3 Sep last 0.266 Sep. Now (ρ) 0.304"
Mag pri 8.71 Mag sec 8.87 delta mag (ΔM) 0.16 Spectral class F8V (yellow-white)
Pri motion ra +008 Sec motion ra
Pri motion dec -037 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 187858 Constellation Sagittarius SAO 188673 HIP 97851
Tycho2 6895-01740-1 HD 187858 GC 27522 ADS 13048
CD CD-2514403 CP CP-25 6930 Distance 89.13 Distance ly 290.74
 
 
ORBITAL ELEMENTS
 
 
Period (P)47.21y Periastron (T)2006.84y Semi-major axis (a)0.196a
Eccentricity (e)0.764 Inclination (i)78.8° Longitude of periastron (ω)32°
Node (Ω)153.8° Notesn ReferenceDoc2010j
Equinox2000 Last observation2009 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 0.2 0.086
2001 6.7 0.066
2002 19.0 0.046
2003 47.1 0.030
2004 97.8 0.028
2005 131.1 0.041
2006 147.5 0.052
2007 165.2 0.033
2008 303.5 0.025
2009 323.1 0.073
2010 327.5 0.112
2011 329.8 0.145
2012 331.2 0.173
2013 332.3 0.196
2014 333.2 0.216
2015 333.9 0.234
2016 334.5 0.249
2017 335.1 0.261
2018 335.6 0.272
2019 336.1 0.282
2020 336.5 0.289
2021 337.0 0.295
2022 337.4 0.300
2023 337.8 0.304
2024 338.2 0.306
2025 338.6 0.307
2026 338.9 0.307
2027 339.3 0.306
2028 339.7 0.304
2029 340.1 0.301
2030 340.5 0.297


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



 
 


wds19531-2528c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic