02318+8916 WRH  39Aa,Ab

 
 
02h 31m 49.09s +89 15' 50.7" P.A. 170 sep 0.07 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
2014
Obs
8
Pa first
250
Pa last
175
P.A. Now (θ)
170°
Sep first
0.2
Sep last
0.1
Sep. Now (ρ)
0.07"
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 2014 8 170 0.1 2.30 4.30 2.00 Y <===
Show Polaris 308 02318+8916 STF 93 AB 1779 2016 64 236 18.4 2.04 9.10 7.06
Show 02318+8916 STF 93 AC 1884 2016 7 103 39.0 2.04 13.80 11.76
Show 02318+8916 STF 93 AD 1884 2016 8 194 83.2 2.04 14.30 12.26
Show 02318+8916 STF 93 BC 2005 2015 3 83 53.1 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
 
 
Precise pa
175
Precise sep
0.085
Constellation
Ursa Minor
SAO
308
HIP
11767
Gaia DR2
9921505664
HD
8890
HR
424
GC
2243
ADS
1477
BD
BD+88 8
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
175
last precise sep
0.085
 
 
ORBITAL ELEMENTS
 
 
Period (P)29.59y± 0.02 Periastron (T)1987.66y± 0.13 Semi-major axis (a)0.1204a± 0.0059
Eccentricity (e)0.608± 0.005 Inclination (i)146.2°± 10.9 Longitude of periastron (ω)303.01°± 0.75
Node (Ω)191.4°± 4.9 Note Grade4(1=Definitive, 9=Indet.)
Equinox2000 Last observation2014
label rho theta
2000 0.163 73.5
2001 0.167 69.3
2002 0.170 65.2
2003 0.172 61.2
2004 0.173 57.3
2005 0.173 53.4
2006 0.171 49.5
2007 0.169 45.5
2008 0.165 41.3
2009 0.159 36.9
2010 0.151 32.1
2011 0.142 26.7
2012 0.130 20.4
2013 0.116 12.7
2014 0.098 2.6
2015 0.077 347.3
2016 0.054 319.1
2017 0.041 260.7
2018 0.052 202.5
2019 0.068 170.0
2020 0.082 149.2
2021 0.094 134.0
2022 0.105 122.2
2023 0.115 112.6
2024 0.125 104.5
2025 0.134 97.5
2026 0.142 91.4
2027 0.149 85.9
2028 0.155 80.8
2029 0.161 76.2
2030 0.165 71.8

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

grafico orbita





wds02318%2B8916d.png orbit plot
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
02318+8916 WRH 39 Aa,Ab 2014 8 175 0.1 2.30 4.30 F7:Ib-IIv NO 023149.09+891550.7

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