19549+5049 HU  687

 
 
19h 54m 56.19s +50 49' 11.9" P.A. 39.4 sep 0.2 mag 8.54,8.63 Sp A0 dist. 256.41 pc (836.41 l.y.)
 
 
Coord 2000
19549+5049
Discov num
HU  687
Comp
Coord arcsec 2000
19 54 56.19 +50 49 11.9
Date first
1904
Date last
2008
Obs
45
Pa first
93
Pa last
27
P.A. Now (θ)
39.4°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.2"
Mag pri
8.54
Mag sec
8.63
delta mag (ΔM)
0.09
Spectral class
A0 (white)
Pri motion ra
+005
Sec motion ra
Pri motion dec
+025
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
26.9
Precise sep
0.196
Constellation
Cygnus
HIP
97997
HD
188871
ADS
13135
Distance
256.41
Distance ly
836.41
last precise pa
26.9
last precise sep
0.196
 
 
ORBITAL ELEMENTS
 
 
Period (P)154.6y Periastron (T)1960.63y Semi-major axis (a)0.159a
Eccentricity (e)0.321 Inclination (i)36.2° Longitude of periastron (ω)218.9°
Node (Ω)28.9° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.174 16.5
2001 0.176 18.0
2002 0.178 19.4
2003 0.180 20.8
2004 0.182 22.2
2005 0.184 23.6
2006 0.185 24.9
2007 0.187 26.2
2008 0.188 27.5
2009 0.190 28.7
2010 0.191 30.0
2011 0.192 31.2
2012 0.194 32.4
2013 0.195 33.6
2014 0.196 34.8
2015 0.197 35.9
2016 0.197 37.1
2017 0.198 38.2
2018 0.199 39.4
2019 0.199 40.5
2020 0.200 41.6
2021 0.200 42.8
2022 0.200 43.9
2023 0.201 45.0
2024 0.201 46.1
2025 0.201 47.3
2026 0.201 48.4
2027 0.201 49.5
2028 0.200 50.6
2029 0.200 51.7
2030 0.200 52.8

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

grafico orbita





wds19549%2B5049b.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
19549+5049 HU 687 2001 41 20 0.2 8.54 8.63 A0 NOD 195456.19+504911.9
19549+5049 HU 687 2006 42 25 0.2 8.54 8.63 A0 NOD 195456.19+504911.9
19549+5049 HU 687 2008 43 27 0.2 8.54 8.63 A0 NOD 195456.19+504911.9

If you need more information about this double, apply for a data request form to the WDS.