19305-3149 B   972

 
 
19h 30m 27.58s -31 49' 25.1" P.A. 199 sep 0.1 mag 9.80,9.80 Sp F2V
 
 
Coord 2000
19305-3149
Discov num
B   972
Comp
Coord arcsec 2000
19 30 27.58 -31 49 25.1
Date first
1927
Date last
2017
Obs
12
Pa first
78
Pa last
199
P.A. Now (θ)
199°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.1"
Mag pri
9.80
Mag sec
9.80
delta mag (ΔM)
0
Spectral class
F2V (yellow-white)
Pri motion ra
+007
Sec motion ra
Pri motion dec
-016
Sec motion dec
Notes
O (Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
199.3
Precise sep
0.062
Constellation
Sagittarius
last precise pa
199.3
last precise sep
0.062
 
 
ORBITAL ELEMENTS
 
 
Period (P)210.8y Periastron (T)2010.98y Semi-major axis (a)0.152a
Eccentricity (e)0.681 Inclination (i)144.8° Longitude of periastron (ω)275°
Node (Ω)183° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2017
label rho theta
2000 0.082 359.4
2001 0.078 355.7
2002 0.073 351.5
2003 0.068 346.8
2004 0.063 341.4
2005 0.059 335.0
2006 0.054 327.5
2007 0.049 318.6
2008 0.045 308.0
2009 0.042 295.6
2010 0.040 281.5
2011 0.040 266.6
2012 0.041 252.0
2013 0.043 238.6
2014 0.047 227.0
2015 0.051 217.2
2016 0.056 208.9
2017 0.060 201.9
2018 0.065 195.9
2019 0.069 190.6
2020 0.074 186.0
2021 0.078 181.9
2022 0.082 178.3
2023 0.086 174.9
2024 0.090 171.9
2025 0.093 169.1
2026 0.097 166.5
2027 0.100 164.0
2028 0.104 161.8
2029 0.107 159.6
2030 0.110 157.6

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

grafico orbita





wds19305-3149a.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
19305-3149 B 972 1991 7 22 0.1 9.80 9.80 F2V 193027.58-314925.1
19305-3149 B 972 2009 9 109 0.0 9.80 9.80 F2V 193027.58-314925.1
19305-3149 B 972 2015 11 36 0.1 9.80 9.80 F2V 193027.58-314925.1
19305-3149 B 972 2017 12 199 0.1 9.80 9.80 F2V O 193027.58-314925.1

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