13473+1727 STT 270 AB (Tau Boo)

 
 
13h 47m 15.74s +17° 27' 24.8" P.A. 76.00 sep 1.5 mag 4.50,11.10 Sp F6IV+M2V dist. 15.62 pc (50.95 l.y.)
 
 
Coord 2000 13473+1727 Discov num STT 270 Comp AB Coord arcsec 2000 13 47 15.74 +17 27 24.8
Date first 1825 Date last 2017 Obs 70
Pa first 345 Pa last 76.3 P.A. Now (θ) 76.3°
Sep first 22.5 Sep last 1.5 Sep. Now (ρ) 1.5"
Mag pri 4.50 Mag sec 11.10 delta mag (ΔM) 6.6 Spectral class F6IV+M2V (yellow-white/red)
Pri motion ra -482 Sec motion ra
Pri motion dec +041 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
13473+1727 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Tau Boo 100706 13 47 16 +17 27 25 STT 270 AB 2017 70 76 1.5 4.50 11.10 6.60 Y <===
Show 100706 13 47 16 +17 27 25 PIN 9 AC 1998 1 187 42.6 3.51 14.33 10.82
Triple system
3 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Tau Boo Var name NSV6444 Boo Constellation Bootes SAO 100706
HIP 67275 Tycho2 1460-00132-1 HD 120136 HR 5185
GC 18637 ADS 9025 GL Gl 527A BD BD+18 2782
Bayer Tau Bootis Bayer name Tau Boo Flamsteed 4 Bootis Flamsteed name 4 Boo
FK5 507 Distance 15.62 Distance ly 50.95 Bayer greek τ Boo
 
 
ORBITAL ELEMENTS
 
 
Period (P)964y± 1321 Periastron (T)2030y± 5 Semi-major axis (a)7.6a± 6.9
Eccentricity (e)0.836± 0.074 Inclination (i)37°± 39.7 Longitude of periastron (ω)334.2°± 28.6
Node (Ω)171.9°± 50.3 Notesn ReferenceDru2014
Equinox Last observation2012 Grade5(1=Definitive, 9=Indet.)
label theta rho
2000 31.1 2.818
2001 32.3 2.740
2002 33.6 2.662
2003 35.0 2.583
2004 36.4 2.503
2005 38.0 2.423
2006 39.7 2.343
2007 41.4 2.263
2008 43.4 2.183
2009 45.4 2.103
2010 47.6 2.024
2011 50.0 1.944
2012 52.6 1.866
2013 55.5 1.788
2014 58.6 1.713
2015 61.9 1.638
2016 65.6 1.567
2017 69.6 1.498
2018 74.1 1.433
2019 78.9 1.373
2020 84.1 1.318
2021 89.7 1.270
2022 95.8 1.229
2023 102.2 1.196
2024 109.0 1.172
2025 116.0 1.157
2026 123.1 1.151
2027 130.2 1.154
2028 137.2 1.164
2029 144.1 1.181
2030 150.8 1.203


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



 
 


wds13473%2B1727b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic