19531-2528 B   454

 
 
19h 53m 08.30s -25 27' 41.2" P.A. 335.6 sep 0.27 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
337
P.A. Now (θ)
335.6°
Sep first
0.3
Sep last
0.3
Sep. Now (ρ)
0.27"
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
 
 
Precise pa
336.8
Precise sep
0.266
Cdsa2 id
B 454
Constellation
Sagittarius
HIP
97851
HD
187858
ADS
13048
Ra deg
19.885638888888888
De deg
-25.461444444444442
Distance
89.13
Distance ly
290.74
last precise pa
336.8
last precise sep
0.266
 
 
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° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2009
label rho theta
2000 0.086 0.2
2001 0.066 6.7
2002 0.046 19.0
2003 0.030 47.1
2004 0.028 97.8
2005 0.041 131.1
2006 0.052 147.5
2007 0.033 165.2
2008 0.025 303.5
2009 0.073 323.1
2010 0.112 327.5
2011 0.145 329.8
2012 0.173 331.2
2013 0.196 332.3
2014 0.216 333.2
2015 0.234 333.9
2016 0.249 334.5
2017 0.261 335.1
2018 0.272 335.6
2019 0.282 336.1
2020 0.289 336.5
2021 0.295 337.0
2022 0.300 337.4
2023 0.304 337.8
2024 0.306 338.2
2025 0.307 338.6
2026 0.307 338.9
2027 0.306 339.3
2028 0.304 339.7
2029 0.301 340.1
2030 0.297 340.5

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

grafico orbita





wds19531-2528c.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
19531-2528 B 454 1991 25 345 0.2 8.71 8.87 F8V NO 195308.30-252741.2
19531-2528 B 454 2009 29 324 0.1 8.71 8.87 F8V NO 195308.30-252741.2
19531-2528 B 454 2014 28 336 0.2 8.71 8.87 F8V NO 195308.30-252741.2
19531-2528 B 454 2017 29 337 0.3 8.71 8.87 F8V NO 195308.30-252741.2

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