11210-5429 I 879 (Pi Cen)

 
 
11h 21m 00.40s -54° 29' 27.7" P.A. 113.00 sep 0.3 mag 4.08,5.65 Sp B5Vn dist. 109.65 pc (357.68 l.y.)
 
 
Coord 2000 11210-5429 Discov num I   879 Comp Coord arcsec 2000 11 21 00.40 -54 29 27.7
Date first 1910 Date last 2019 Obs 59
Pa first 140 Pa last 113.1 P.A. Now (θ) 119.2°
Sep first 0.5 Sep last 0.329 Sep. Now (ρ) 0.378"
Mag pri 4.08 Mag sec 5.65 delta mag (ΔM) 1.57 Spectral class B5Vn (blue-white)
Pri motion ra -040 Sec motion ra -040
Pri motion dec -003 Sec motion dec -003
Notes N O (See Notes, Orbital solution)
This double is physical.
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Pi Cen Constellation Centaurus SAO 238986 HIP 55425
Tycho2 8621-02002-1 Gaia DR2 5346659311958869248 HD 98718 HR 4390
GC 15601 CP CP-53 4498 Bayer Pi Centauri Bayer name Pi Cen
FK5 428 Distance 109.65 Distance ly 357.68 Bayer greek π Cen
 
 
ORBITAL ELEMENTS
 
 
Period (P)39y± 0.19 Periastron (T)2010.41y± 0.037 Semi-major axis (a)0.2263a± 0.0011
Eccentricity (e)0.853± 0.004 Inclination (i)19.4°± 4.9 Longitude of periastron (ω)340.3°± 4
Node (Ω)327.8°± 3.9 Notesn ReferenceTok2012b
Equinox2000 Last observation2012 Grade3(1=Definitive, 9=Indet.)
label theta rho
2000 142.6 0.356
2001 144.5 0.340
2002 146.7 0.323
2003 149.0 0.303
2004 151.8 0.280
2005 155.0 0.254
2006 159.1 0.224
2007 164.5 0.190
2008 172.6 0.150
2009 187.6 0.102
2010 237.8 0.045
2011 33.1 0.056
2012 71.4 0.108
2013 85.5 0.152
2014 93.5 0.190
2015 98.9 0.223
2016 103.1 0.251
2017 106.4 0.277
2018 109.2 0.299
2019 111.6 0.319
2020 113.8 0.337
2021 115.8 0.353
2022 117.6 0.366
2023 119.2 0.378
2024 120.8 0.388
2025 122.3 0.397
2026 123.8 0.404
2027 125.2 0.409
2028 126.6 0.413
2029 127.9 0.416
2030 129.3 0.417


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



 
 


wds11210-5429b.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic