19210+3931 MLB 861 (Ups Sgr)

 
 
19h 21m 00.00s +39° 31' 00.0" P.A. 114.00 sep 5.6 mag 9.50,10.00 dist. 546.45 pc (1782.52 l.y.)
 
 
Coord 2000 19210+3931 Discov num MLB 861 Comp Coord arcsec 2000 19 21 00.00 +39 31 00.0
Date first 1933 Date last 1933 Obs 1
Pa first 114 Pa last 114.1 P.A. Now (θ) 114.1°
Sep first 5.6 Sep last 5.64 Sep. Now (ρ) 5.64"
Mag pri 9.50 Mag sec 10.00 delta mag (ΔM) 0.5 Spectral class
Pri motion ra Sec motion ra
Pri motion dec Sec motion dec
Notes X (Dubious double)
Nature of this double is uncertain.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Ups Sgr Spectr F2p Constellation Lyra SAO 162518
HIP 95176 Tycho2 6297-01419-1 HD 181615 HR 7342
GC 26697 BD BD-16 5283 Bayer Upsilon Sagittarii Bayer name Ups Sgr
FK5 727 Coordinate calcolate 1 Distance 546.45 Distance ly 1782.52
Coordinate calculated yes Bayer greek υ Sgr
Bayer or Flamsteed indentifiers not always match the correct constellation because of procession and proper motion of the star. (Sgr vs Lyr)
 
 
ORBITAL ELEMENTS
 
 
Period (P)137.9343d Periastron (T)33018.1d (1949.276y) Semi-major axis (a)2.1m± 0.3
Eccentricity (e)0 Inclination (i)50°± 10 Longitude of periastron (ω)
Node (Ω)80°± 10 Notesn ReferenceBnu2011
Equinox2000 Last observation2009 Grade8(1=Definitive, 9=Indet.)
label theta rho
2000-01-01 203.6 0.001
2001-01-01 71.2 0.002
2002-01-01 288.1 0.002
2003-01-01 174.5 0.001
2004-01-01 56.7 0.002
2005-01-01 272.8 0.002
2006-01-01 144.1 0.001
2007-01-01 38.5 0.002
2008-01-01 259.5 0.002
2009-01-01 119.9 0.002
2010-01-01 13.7 0.001
2011-01-01 246.1 0.002
2012-01-01 102.1 0.002
2013-01-01 343.0 0.001
2014-01-01 230.6 0.002
2015-01-01 87.8 0.002
2016-01-01 314.4 0.002
2017-01-01 210.2 0.002
2018-01-01 74.7 0.002
2019-01-01 292.8 0.002
2020-01-01 182.8 0.001
2021-01-01 60.8 0.002
2022-01-01 276.6 0.002
2023-01-01 151.9 0.001
2024-01-01 43.9 0.002
2025-01-01 263.0 0.002
2026-01-01 125.7 0.002
2027-01-01 21.0 0.001
2028-01-01 249.8 0.002
2029-01-01 106.4 0.002
2030-01-01 351.4 0.001


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



 
 


wds19217-1557a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic