03321+4340 COU 1688 AB (HD 21727)

 
 
03h 32m 05.10s +43° 40' 11.5" P.A. 153.00 sep 0.4 mag 8.56,8.90 Sp G5 dist. 60.79 pc (198.3 l.y.)
 
 
Coord 2000 03321+4340 Discov num COU1688 Comp AB Coord arcsec 2000 03 32 05.10 +43 40 11.5
Date first 1978 Date last 2012 Obs 6
Pa first 29 Pa last 152.9 P.A. Now (θ) 152.9°
Sep first 0.1 Sep last 0.435 Sep. Now (ρ) 0.435"
Mag pri 8.56 Mag sec 8.90 delta mag (ΔM) 0.34 Spectral class G5 (yellow)
Pri motion ra +298 Sec motion ra
Pri motion dec -120 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
03321+4340 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show HD 21727 38921 03 32 05 +43 40 12 COU 1688 AB 2012 6 153 0.4 8.56 8.90 0.34 Y <===
Show 38921 03 32 05 +43 40 12 LDS 9155 AC 2016 11 137 14.7 8.56 13.09 4.53
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name HD 21727 Constellation Perseus SAO 38921 HIP 16467
Tycho2 2874-00788-1 Gaia DR2 238521867779351296 HD 21727 BD BD+43 744
Distance 60.79 Distance ly 198.3
 
 
ORBITAL ELEMENTS
 
 
Period (P)9.15y Periastron (T)1987.02y Semi-major axis (a)0.144a
Eccentricity (e)0.08 Inclination (i)43.7° Longitude of periastron (ω)303.9°
Node (Ω)26.5° Notesn ReferenceBaz1993d
Equinox2000 Last observation1986 Grade4(1=Definitive, 9=Indet.)
label theta rho
2000 128.5 0.113
2001 168.2 0.134
2002 196.8 0.150
2003 224.0 0.140
2004 262.8 0.108
2005 322.1 0.101
2006 8.0 0.128
2007 40.2 0.137
2008 75.6 0.120
2009 121.4 0.111
2010 163.1 0.130
2011 192.9 0.149
2012 219.5 0.143
2013 255.5 0.112
2014 313.1 0.098
2015 2.5 0.124
2016 35.6 0.137
2017 69.6 0.123
2018 114.3 0.111
2019 157.8 0.126
2020 188.9 0.147
2021 215.3 0.146
2022 248.9 0.117
2023 303.9 0.097
2024 356.6 0.120
2025 30.9 0.138
2026 63.9 0.126
2027 107.1 0.111
2028 152.1 0.123
2029 184.8 0.145
2030 211.2 0.148


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



 
 


wds03321%2B4340a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic