20154+6412 MLR  60AB

 
 
20h 15m 21.50s +64 11' 55.6" P.A. 39.8 sep 0.1 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
P.A. Now (θ)
39.8°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.1"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 20154+6412 MLR 60 AB 1970 2008 24 40 0.1 8.46 8.50 0.04 Y <===
Show 20154+6412 LDS5245 AC 1960 1960 1 122 20.0 8.46 17.03 8.57
Show 20154+6412 SHY 772 AD 1991 1999 3 246 999.9 8.46 10.12 1.66
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
173.2
Precise sep
0.249
Constellation
Draco
SAO
18780
HIP
99832
Tycho2
4240-00516-1
Gaia DR2
34213430272
HD
193215
BD
BD+63 1608
Distance
68.97
Distance ly
224.98
last precise pa
173.2
last precise sep
0.249
 
 
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° Note Grade3(1=Definitive, 9=Indet.)
Equinox2000 Last observation2008
label rho theta
2000 0.200 188.2
2001 0.213 185.3
2002 0.224 182.8
2003 0.231 180.4
2004 0.235 178.1
2005 0.236 175.9
2006 0.233 173.6
2007 0.226 171.3
2008 0.216 168.8
2009 0.203 165.9
2010 0.187 162.7
2011 0.169 158.8
2012 0.148 153.9
2013 0.127 147.3
2014 0.105 138.0
2015 0.086 124.2
2016 0.073 104.0
2017 0.070 79.0
2018 0.079 56.2
2019 0.096 39.8
2020 0.117 28.8
2021 0.139 21.2
2022 0.160 15.7
2023 0.180 11.4
2024 0.198 8.0
2025 0.213 5.0
2026 0.225 2.5
2027 0.234 0.1
2028 0.240 357.9
2029 0.242 355.8
2030 0.241 353.7

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






wds20154%2B6412b.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
20154+6412 MLR 60 AB 1997 21 349 0.2 8.46 8.50 G5 O 201521.50+641153.5
20154+6412 MLR 60 AB 2007 22 349 0.2 8.46 8.50 G5 O 201521.50+641153.5
20154+6412 MLR 60 AB 2008 24 173 0.2 8.46 8.50 G5 NOD 201521.50+641153.5

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