11541+7155 A    75

 
 
11H 54M 04.36S +71 55' 27.1" P.A. 27.7 SEP 0.25 MAG 7.99,9.10 SP F4V DIST. 88.97 PC (290.22 L.Y.)
 
 
Coord 2000
11541+7155
Discov num
A    75
Comp
Coord arcsec 2000
11 54 04.36 +71 55 27.1
Date first
1900
Date last
1995
Obs
39
Pa first
209
Pa last
193
P.A. Now (θ)
27.7°
Sep first
0.3
Sep last
0.2
Sep. Now (ρ)
0.25"
Mag pri
7.99
Mag sec
9.10
delta mag (ΔM)
1.11
Spectral class
F4V (yellow-white)
Pri motion ra
-085
Sec motion ra
Pri motion dec
-019
Sec motion dec
Notes
N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Draco
SAO
7446
HIP
58026
Tycho2
4396-00328-1
HD
103321
ADS
8344
BD
BD+72 550
Distance
88.97
Distance ly
290.22
last precise pa
192.9
last precise sep
0.2
 
 
ORBITAL ELEMENTS
 
 
Period (P)82.3y Periastron (T)1921.8y Semi-major axis (a)0.267a
Eccentricity (e)0.08 Inclination (i)104.5° Longitude of periastron (ω)277.5°
Node (Ω)23° Note Grade3(1=Definitive, 9=Indet.)
Equinox Last observation
label rho theta
2000 0.083 156.9
2001 0.071 143.6
2002 0.063 126.0
2003 0.062 105.7
2004 0.068 86.9
2005 0.079 72.3
2006 0.094 61.8
2007 0.110 54.3
2008 0.127 48.7
2009 0.143 44.4
2010 0.159 41.0
2011 0.175 38.2
2012 0.190 35.8
2013 0.203 33.8
2014 0.216 32.0
2015 0.227 30.4
2016 0.236 29.0
2017 0.245 27.7
2018 0.251 26.4
2019 0.257 25.2
2020 0.260 24.0
2021 0.263 22.9
2022 0.263 21.8
2023 0.263 20.6
2024 0.260 19.5
2025 0.257 18.3
2026 0.252 17.1
2027 0.246 15.9
2028 0.238 14.6
2029 0.230 13.1
2030 0.220 11.6

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