18428+5938 STF2398AB

 
 
18H 42M 46.69S +59 37' 49.4" P.A. 181.1 SEP 11.13 MAG 9.11,9.96 SP M4+M4.5 DIST. 3.57 PC (11.65 L.Y.)
 
 
Coord 2000
18428+5938
Discov num
STF2398
Comp
AB
Coord arcsec 2000
18 42 46.69 +59 37 49.4
Date first
1831
Date last
2015
Obs
619
Pa first
136
Pa last
180
P.A. Now (θ)
181.1°
Sep first
14.0
Sep last
11.6
Sep. Now (ρ)
11.13"
Mag pri
9.11
Mag sec
9.96
delta mag (ΔM)
0.85
Spectral class
M4+M4.5 (red/red)
Pri motion ra
-133
Sec motion ra
-139
Pri motion dec
+180
Sec motion dec
+185
Notes
N O P (See Notes, Orbital solution, 100-year proper motion)
This double is physical.
 
 
18428+5938 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 31128 18428+5938 STF2398 AB 1831 2015 619 181 11.1 9.11 9.96 0.85 Y <===
Show 31128 18428+5938 STF2398 AC 1904 2000 19 158 214.9 9.11 12.24 3.13
Show 31128 18428+5938 POP1224 AD 1988 2008 3 110 100.0 9.11 13.50 4.39
Show 31129 18428+5938 STF2398 BC 1904 2000 18 157 202.7 9.96 12.24 2.28
Quadruple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Draco
SAO
31128
HIP
91768
Tycho2
3930-01791-1
HD
173739
ADS
11632
GL
Gl 725A
BD
BD+59 1915
Distance
3.57
Distance ly
11.65
last precise pa
179.6
last precise sep
11.566
 
 
ORBITAL ELEMENTS
 
 
Period (P)408y Periastron (T)1775y Semi-major axis (a)13.88a
Eccentricity (e)0.53 Inclination (i)66° Longitude of periastron (ω)234.6°
Node (Ω)136.9° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation1987
label rho theta
2000 12.596 173.6
2001 12.516 173.9
2002 12.436 174.3
2003 12.356 174.7
2004 12.275 175.1
2005 12.194 175.5
2006 12.113 175.9
2007 12.032 176.3
2008 11.950 176.7
2009 11.869 177.1
2010 11.787 177.5
2011 11.704 177.9
2012 11.622 178.4
2013 11.539 178.8
2014 11.457 179.2
2015 11.374 179.7
2016 11.291 180.2
2017 11.208 180.6
2018 11.125 181.1
2019 11.042 181.6
2020 10.959 182.0
2021 10.876 182.5
2022 10.793 183.0
2023 10.710 183.5
2024 10.627 184.1
2025 10.544 184.6
2026 10.462 185.1
2027 10.379 185.7
2028 10.297 186.2
2029 10.215 186.8
2030 10.132 187.3

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