13473+1727 STT 270AB (Tau Boo)

 
 
13H 47M 15.74S +17 27' 24.8" P.A. 74.1 SEP 1.43 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
2012
Obs
62
Pa first
345
Pa last
57
P.A. Now (θ)
74.1°
Sep first
22.5
Sep last
1.8
Sep. Now (ρ)
1.43"
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_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show Tau Boo 100706 13473+1727 STT 270 AB 1825 2012 62 74 1.4 4.50 11.10 6.60 Y <===
Show 100706 13473+1727 PIN 9 AC 1998 1998 1 187 42.6 3.51 14.33 10.82
Triple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
Tau 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
Distance
15.62
Distance ly
50.95
last precise pa
56.6
last precise sep
1.826
 
 
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 Note Grade5(1=Definitive, 9=Indet.)
Equinox Last observation2012
label rho theta
2000 2.818 31.1
2001 2.740 32.3
2002 2.662 33.6
2003 2.583 35.0
2004 2.503 36.4
2005 2.423 38.0
2006 2.343 39.7
2007 2.263 41.4
2008 2.183 43.4
2009 2.103 45.4
2010 2.024 47.6
2011 1.944 50.0
2012 1.866 52.6
2013 1.788 55.5
2014 1.713 58.6
2015 1.638 61.9
2016 1.567 65.6
2017 1.498 69.6
2018 1.433 74.1
2019 1.373 78.9
2020 1.318 84.1
2021 1.270 89.7
2022 1.229 95.8
2023 1.196 102.2
2024 1.172 109.0
2025 1.157 116.0
2026 1.151 123.1
2027 1.154 130.2
2028 1.164 137.2
2029 1.181 144.1
2030 1.203 150.8

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

grafico orbita





grafico misure orbit6
Measures: green=micrometric, blue=interferometric, purple=photographic