18437+3141 A 253

 
 
18h 43m 43.55s +31° 40' 54.1" P.A. 132.00 sep 0.7 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 2016 Obs 73
Pa first 129 Pa last 132.4 P.A. Now (θ) 132.4°
Sep first 0.8 Sep last 0.69 Sep. Now (ρ) 0.69"
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 HIP 91868 Tycho2 2637-00358-1 Gaia DR2 2090020902595370240
ADS 11623 BD BD+31 3347 Distance 47.62 Distance ly 155.34
 
 
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° Notesn ReferenceBaz1987d
Equinox Last observation1983 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 127.5 0.791
2001 127.9 0.784
2002 128.4 0.777
2003 128.8 0.770
2004 129.3 0.762
2005 129.8 0.753
2006 130.3 0.743
2007 130.8 0.733
2008 131.3 0.723
2009 131.8 0.712
2010 132.3 0.700
2011 132.9 0.688
2012 133.5 0.675
2013 134.1 0.661
2014 134.7 0.647
2015 135.4 0.632
2016 136.1 0.616
2017 136.8 0.600
2018 137.6 0.582
2019 138.4 0.565
2020 139.3 0.546
2021 140.2 0.527
2022 141.3 0.507
2023 142.4 0.486
2024 143.6 0.464
2025 144.9 0.441
2026 146.4 0.417
2027 148.0 0.393
2028 149.9 0.368
2029 152.1 0.341
2030 154.6 0.314


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



 
 


wds18437%2B3141a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic