18437+3141 A   253

 
 
18H 43M 43.55S +31 40' 54.1" P.A. 137.6 SEP 0.58 MAG 9.71,10.29 SP K0 DIST. 47.62 PC (155.34 L.Y.)
 
 
Coord 2000
18437+3141
Discov num
A   253
Comp
Coord arcsec 2000
18 43 43.55 +31 40 54.1
Date first
1901
Date last
2015
Obs
65
Pa first
129
Pa last
134
P.A. Now (θ)
137.6°
Sep first
0.8
Sep last
0.8
Sep. Now (ρ)
0.58"
Mag pri
9.71
Mag sec
10.29
delta mag (ΔM)
0.58
Spectral class
K0 (yellow-orange)
Pri motion ra
-043
Sec motion ra
-043
Pri motion dec
-041
Sec motion dec
-041
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Lyra
SAO
67291
HIP
91868
Tycho2
2637-00358-1
ADS
11623
BD
BD+31 3347
Distance
47.62
Distance ly
155.34
last precise pa
134.3
last precise sep
0.78
 
 
ORBITAL ELEMENTS
 
 
Period (P)98.57y Periastron (T)1942.28y Semi-major axis (a)0.47a
Eccentricity (e)0.78 Inclination (i)57.5° Longitude of periastron (ω)12°
Node (Ω)297.5° Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation1983
label rho theta
2000 0.791 127.5
2001 0.784 127.9
2002 0.777 128.4
2003 0.770 128.8
2004 0.762 129.3
2005 0.753 129.8
2006 0.743 130.3
2007 0.733 130.8
2008 0.723 131.3
2009 0.712 131.8
2010 0.700 132.3
2011 0.688 132.9
2012 0.675 133.5
2013 0.661 134.1
2014 0.647 134.7
2015 0.632 135.4
2016 0.616 136.1
2017 0.600 136.8
2018 0.582 137.6
2019 0.565 138.4
2020 0.546 139.3
2021 0.527 140.2
2022 0.507 141.3
2023 0.486 142.4
2024 0.464 143.6
2025 0.441 144.9
2026 0.417 146.4
2027 0.393 148.0
2028 0.368 149.9
2029 0.341 152.1
2030 0.314 154.6

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic