09521+5404 STT 208 (Phi UMa)

 
 
09h 52m 06.36s +54° 03' 51.4" P.A. 317.00 sep 0.5 mag 5.28,5.39 Sp A2V dist. 156.01 pc (508.9 l.y.)
 
 
Coord 2000 09521+5404 Discov num STT 208 Comp Coord arcsec 2000 09 52 06.36 +54 03 51.4
Date first 1842 Date last 2022 Obs 326
Pa first 4 Pa last 316.9 P.A. Now (θ) 317.7°
Sep first 0.4 Sep last 0.48 Sep. Now (ρ) 0.448"
Mag pri 5.28 Mag sec 5.39 delta mag (ΔM) 0.11 Spectral class A2V (white)
Pri motion ra -005 Sec motion ra
Pri motion dec +021 Sec motion dec
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Phi UMa Constellation Ursa Major SAO 27408 HIP 48402
Tycho2 3814-01752-1 HD 85235 HR 3894 GC 13559
ADS 7545 BD BD+54 1331 Bayer Phi Ursae Majoris Bayer name Phi UMa
Flamsteed 30 Ursae Majoris Flamsteed name 30 UMa Distance 156.01 Distance ly 508.9
Bayer greek φ UMa
 
 
ORBITAL ELEMENTS
 
 
Period (P)106.35y± 0.68 Periastron (T)1987.37y± 0.05 Semi-major axis (a)0.337a± 0.002
Eccentricity (e)0.445± 0.002 Inclination (i)22.2°± 0.4 Longitude of periastron (ω)25.6°± 1.4
Node (Ω)138.9°± 1.8 Notesn ReferenceMsn2021c
Equinox Last observation2019 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 259.1 0.260
2001 263.6 0.271
2002 267.8 0.282
2003 271.7 0.293
2004 275.3 0.303
2005 278.6 0.313
2006 281.8 0.324
2007 284.7 0.333
2008 287.5 0.343
2009 290.1 0.352
2010 292.6 0.361
2011 295.0 0.370
2012 297.3 0.378
2013 299.5 0.386
2014 301.6 0.394
2015 303.6 0.401
2016 305.5 0.408
2017 307.4 0.415
2018 309.3 0.421
2019 311.0 0.427
2020 312.7 0.433
2021 314.4 0.438
2022 316.1 0.443
2023 317.7 0.448
2024 319.2 0.452
2025 320.8 0.456
2026 322.3 0.460
2027 323.8 0.464
2028 325.3 0.467
2029 326.7 0.469
2030 328.2 0.472


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


 
  


wds09521%2B5404c.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic