20154+6412 MLR 60 AB

 
 
20h 15m 21.50s +64 11' 55.6" P.A. 173.00 sep 0.2 mag 8.46,8.50 Sp G5 dist. 68.97 pc (224.98 l.y.)
 
 
Coord 2000 20154+6412 Discov num MLR  60 Comp AB Coord arcsec 2000 20 15 21.50 +64 11 55.6
Date first 1970 Date last 2008 Obs 24
Pa first 20 Pa last 173.2 P.A. Now (θ) 11.4°
Sep first 0.2 Sep last 0.249 Sep. Now (ρ) 0.18"
Mag pri 8.46 Mag sec 8.50 delta mag (ΔM) 0.04 Spectral class G5 (yellow)
Pri motion ra +178 Sec motion ra
Pri motion dec +232 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
20154+6412 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 18780 20 15 22 +64 11 56 MLR 60 AB 2008 24 173 0.2 8.46 8.50 0.04 Y <===
Show 20 15 22 +64 11 56 LDS 5245 AC 1960 1 122 20.0 8.46 17.03 8.57
Show 20 15 22 +64 11 56 SHY 772 AD 2016 4 247 999.9 8.46 10.12 1.66
Quadruple system
4 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation Draco SAO 18780 HIP 99832 Tycho2 4240-00516-1
Gaia DR2 2244572934213430272 HD 193215 BD BD+63 1608 Distance 68.97
Distance ly 224.98
 
 
ORBITAL ELEMENTS
 
 
Period (P)50y Periastron (T)1963.9y Semi-major axis (a)0.239a
Eccentricity (e)0.035 Inclination (i)107.5° Longitude of periastron (ω)68.2°
Node (Ω)176° Notesn ReferenceDoc2012j
Equinox2000 Last observation2008 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 188.2 0.200
2001 185.3 0.213
2002 182.8 0.224
2003 180.4 0.231
2004 178.1 0.235
2005 175.9 0.236
2006 173.6 0.233
2007 171.3 0.226
2008 168.8 0.216
2009 165.9 0.203
2010 162.7 0.187
2011 158.8 0.169
2012 153.9 0.148
2013 147.3 0.127
2014 138.0 0.105
2015 124.2 0.086
2016 104.0 0.073
2017 79.0 0.070
2018 56.2 0.079
2019 39.8 0.096
2020 28.8 0.117
2021 21.2 0.139
2022 15.7 0.160
2023 11.4 0.180
2024 8.0 0.198
2025 5.0 0.213
2026 2.5 0.225
2027 0.1 0.234
2028 357.9 0.240
2029 355.8 0.242
2030 353.7 0.241


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



 
 


wds20154%2B6412b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic