02318+8916 WRH  39Aa,Ab

 
 
02H 31M 49.09S +89 15' 50.7" P.A. 144.1 SEP 0.05 MAG 2.3,4.3 SP F7:IB-IIV DIST. 132.63 PC (432.64 L.Y.)
 
 
Coord 2000
02318+8916
Discov num
WRH  39
Comp
Aa,Ab
Coord arcsec 2000
02 31 49.09 +89 15 50.7
Date first
1937
Date last
2006
Obs
6
Pa first
250
Pa last
226
P.A. Now (θ)
144.1°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.05"
Mag pri
2.3
Mag sec
4.3
delta mag (ΔM)
2
Spectral class
F7:Ib-IIv (yellow-white)
Pri motion ra
+038
Sec motion ra
Pri motion dec
-015
Sec motion dec
Notes
N O (See Notes, Orbital solution)
 
 
02318+8916 SYSTEM COMPONENTS
 
 
Show name SAO coord_2000 discov# comp first last obs pa sep mag1 mag2 d_mag orb current
Show 308 02318+8916 WRH 39 Aa,Ab 1937 2006 6 144 0.0 2.30 4.30 2.00 Y <===
Show Polaris 308 02318+8916 STF 93 AB 1779 2013 63 233 18.1 2.04 9.10 7.06
Show 308 02318+8916 STF 93 AC 1884 2009 6 98 38.7 2.04 13.80 11.76
Show 308 02318+8916 STF 93 AD 1884 2009 7 189 82.1 2.04 14.30 12.26
Show 02318+8916 STF 93 BC 2005 2005 2 85 53.2 9.10 13.80 4.70
Show 02318+8916 STF 93 BD 2005 2005 2 182 70.3 9.10 14.30 5.20
Quintuple system
4 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Constellation
Ursa Minor
SAO
308
HIP
11767
HD
8890
HR
424
GC
2243
ADS
1477
Bayer
Alpha Ursae Minoris
Bayer name
Alp UMi
Flamsteed
1 Ursae Minoris
Flamsteed name
1 UMi
Distance
132.63
Distance ly
432.64
last precise pa
226.4
last precise sep
0.17
 
 
ORBITAL ELEMENTS
 
 
Period (P)29.52y± 0.02 Periastron (T)1987.66y± 0.13 Semi-major axis (a)0.128a± 0.004
Eccentricity (e)0.608± 0.005 Inclination (i)50.1°± 4.8 Longitude of periastron (ω)303.01°± 0.75
Node (Ω)276.2°± 9.5 Note Grade4(1=Definitive, 9=Indet.)
Equinox Last observation1993
label rho theta
2000 0.144 40.7
2001 0.150 45.5
2002 0.156 49.8
2003 0.160 53.9
2004 0.164 57.8
2005 0.166 61.5
2006 0.168 65.1
2007 0.168 68.8
2008 0.166 72.4
2009 0.162 76.2
2010 0.157 80.2
2011 0.148 84.6
2012 0.137 89.5
2013 0.122 95.6
2014 0.103 103.6
2015 0.077 116.3
2016 0.047 144.1
2017 0.035 218.0
2018 0.057 269.9
2019 0.071 294.5
2020 0.079 312.4
2021 0.085 327.7
2022 0.090 341.0
2023 0.096 352.8
2024 0.103 3.0
2025 0.110 12.0
2026 0.118 19.8
2027 0.126 26.6
2028 0.133 32.7
2029 0.140 38.1
2030 0.147 43.1

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

grafico orbita





grafico misure orbit6