02318+8916 WRH  39Aa,Ab

 
 
02h 31m 49.09s +89 15' 50.7" P.A. 269.9 sep 0.06 mag 2.30,4.30 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)
269.9°
Sep first
0.2
Sep last
0.2
Sep. Now (ρ)
0.06"
Mag pri
2.30
Mag sec
4.30
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)
This double is physical.
 
 
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 6 270 0.1 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)29.59y Periastron (T)2017.25y Semi-major axis (a)0.131a
Eccentricity (e)0.608 Inclination (i)129° Longitude of periastron (ω)123°
Node (Ω)197° Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2012
label rho theta
2000 0.145 252.1
2001 0.152 247.4
2002 0.157 243.0
2003 0.162 238.9
2004 0.166 235.0
2005 0.169 231.3
2006 0.171 227.7
2007 0.171 224.2
2008 0.169 220.6
2009 0.166 216.9
2010 0.160 212.9
2011 0.152 208.7
2012 0.141 203.8
2013 0.126 198.0
2014 0.106 190.3
2015 0.081 178.3
2016 0.050 152.6
2017 0.035 80.5
2018 0.056 25.5
2019 0.072 0.5
2020 0.080 342.5
2021 0.085 327.2
2022 0.090 313.6
2023 0.096 301.6
2024 0.103 291.1
2025 0.110 281.9
2026 0.118 273.9
2027 0.126 266.9
2028 0.134 260.6
2029 0.141 255.1
2030 0.148 250.1

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
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
02318+8916 WRH 39 Aa,Ab 2006 6 226 0.2 2.30 4.30 F7:Ib-IIv O 023147.08+891550.9

If you need more information about this double, apply for a data request form to the WDS.