18002+8000 STF2308AB (41 Dra)

 
 
18H 00M 09.07S +80 00' 13.7" P.A. 231.9 SEP 18.8 MAG 5.70,6.00 SP F7V+F7V DIST. 63.53 PC (207.23 L.Y.)
 
 
Coord 2000
18002+8000
Discov num
STF2308
Comp
AB
Coord arcsec 2000
18 00 09.07 +80 00 13.7
Date first
1782
Date last
2016
Obs
170
Pa first
235
Pa last
232
P.A. Now (θ)
231.9°
Sep first
20.7
Sep last
18.7
Sep. Now (ρ)
18.8"
Mag pri
5.70
Mag sec
6.00
delta mag (ΔM)
0.3
Spectral class
F7V+F7V (yellow-white/yellow-white)
Pri motion ra
+047
Sec motion ra
+055
Pri motion dec
+124
Sec motion dec
+131
Notes
N C V (See Notes, Has orbit and linear solution, Proper motion indicates physical)
This double is physical.
 
 
18002+8000 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 8996 18002+8000 BAG 6 Aa,Ab 1993 2012 31 331 0.1 6.22 6.69 0.47 Y
Show 41 Dra 8996 18002+8000 STF2308 AB 1782 2016 170 232 18.8 5.70 6.00 0.30 Y <===
Show 8996 18002+8000 STF2308 AC 1782 2004 13 129 224.8 5.70 8.34 2.64
Quadruple system
3 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name
41 Dra
Constellation
Draco
SAO
8996
HIP
88136
Tycho2
4578-01433-1
HD
166866
HR
6810
GC
24669
ADS
11061
BD
BD+79 571
Flamsteed
41 Draconis
Flamsteed name
41 Dra
Distance
63.53
Distance ly
207.23
last precise pa
231.8
last precise sep
18.736
 
 
ORBITAL ELEMENTS
 
 
Period (P)18000y Periastron (T)3381y Semi-major axis (a)24.74a
Eccentricity (e)0.84 Inclination (i)162° Longitude of periastron (ω)138°
Node (Ω)233° Note Grade5(1=Definitive, 9=Indet.)
Equinox2000 Last observation
label rho theta
2000 18.959 232.2
2001 18.950 232.2
2002 18.941 232.2
2003 18.932 232.1
2004 18.923 232.1
2005 18.913 232.1
2006 18.904 232.1
2007 18.895 232.1
2008 18.886 232.1
2009 18.877 232.0
2010 18.868 232.0
2011 18.859 232.0
2012 18.849 232.0
2013 18.840 232.0
2014 18.831 231.9
2015 18.822 231.9
2016 18.813 231.9
2017 18.804 231.9
2018 18.795 231.9
2019 18.785 231.9
2020 18.776 231.8
2021 18.767 231.8
2022 18.758 231.8
2023 18.749 231.8
2024 18.740 231.8
2025 18.730 231.7
2026 18.721 231.7
2027 18.712 231.7
2028 18.703 231.7
2029 18.694 231.7
2030 18.684 231.7

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