11308+4117 STT 234 (HD 100018)

11h 30m 49.91s +41° 17' 12.7" P.A. 189.00 sep 0.4 mag 7.45,8.13 Sp F6V dist. 74.79 pc (243.96 l.y.)

Coord 2000 11308+4117 Discov num STT 234 Comp Coord arcsec 2000 11 30 49.91 +41 17 12.7
Date first 1843 Date last 2021 Obs 272
Pa first 180 Pa last 189.4 P.A. Now (θ) 194.9°
Sep first 0.3 Sep last 0.4 Sep. Now (ρ) 0.357"
Mag pri 7.45 Mag sec 8.13 delta mag (ΔM) 0.68 Spectral class F6V (yellow-white)
Pri motion ra +092 Sec motion ra +092
Pri motion dec -098 Sec motion dec -098
Notes N O (See Notes, Orbital solution)




This double is physical.



OTHER CATALOGS AND DESIGNATIONS

Name HD 100018 Constellation Ursa Major SAO 43789 HIP 56165
Tycho2 3015-02226-1 HD 100018 GC 15787 ADS 8189
BD BD+42 2214 Distance 74.79 Distance ly 243.96




ORBITAL ELEMENTS

Period (P)86.86y± 3 Periastron (T)1967.89y± 0.5 Semi-major axis (a)0.381a± 0.015
Eccentricity (e)0.356± 0.015 Inclination (i)56.6°± 1.5 Longitude of periastron (ω)29.8°± 4
Node (Ω)336.4°± 2 Notesn ReferenceDoc2009g
Equinox2000 Last observation2000 Grade2(1=Definitive, 9=Indet.)

label theta rho
2000 159.2 0.490
2001 160.5 0.493
2002 161.8 0.495
2003 163.1 0.496
2004 164.3 0.496
2005 165.6 0.495
2006 166.8 0.493
2007 168.1 0.490
2008 169.4 0.487
2009 170.7 0.483
2010 172.1 0.478
2011 173.5 0.472
2012 174.9 0.466
2013 176.3 0.459
2014 177.8 0.451
2015 179.4 0.442
2016 181.0 0.433
2017 182.7 0.424
2018 184.4 0.414
2019 186.3 0.403
2020 188.2 0.392
2021 190.3 0.381
2022 192.5 0.369
2023 194.9 0.357
2024 197.4 0.344
2025 200.1 0.332
2026 203.0 0.319
2027 206.2 0.307
2028 209.6 0.294
2029 213.3 0.282
2030 217.4 0.270


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



 
 


wds11308%2B4117b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic