06451-1643 AGC 1 AB (Sirius)

 
 
06h 45m 08.92s -16 42' 58.0" P.A. 67.00 sep 11.3 mag -1.47,8.44 Sp A1Vm+DA2 dist. 2.64 pc (8.61 l.y.)
 
 
Coord 2000 06451-1643 Discov num AGC   1 Comp AB Coord arcsec 2000 06 45 08.92 -16 42 58.0
Date first 1862 Date last 2021 Obs 2062
Pa first 85 Pa last 66.6 P.A. Now (θ) 62.5°
Sep first 10.2 Sep last 11.28 Sep. Now (ρ) 11.333"
Mag pri -1.47 Mag sec 8.44 delta mag (ΔM) 9.91 Spectral class A1Vm+DA2 (white/white dwarf)
Pri motion ra -055 Sec motion ra -055
Pri motion dec -122 Sec motion dec -122
Notes N O P (See Notes, Orbital solution, 100-year proper motion)
This double is physical.
 
 
06451-1643 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show Sirius 151881 06 45 09 -16 42 58 AGC 1 AB 2021 2062 67 11.3 -1.47 8.44 9.91 Y <===
Show 151881 06 45 09 -16 42 58 LEC 1 AC 1999 1 30 64.5 -1.47 12.60 14.07
Show 151881 06 45 09 -16 42 58 AGC 1 AD 1915 2 183 31.6 -1.47 14.00 15.47
Show 151881 06 45 09 -16 42 58 HL 3 AE 2011 7 47 188.3 -1.47 14.50 15.97
Show 151881 06 45 09 -16 42 58 BU 1411 AF 2011 7 61 125.7 -1.47 13.80 15.27
Show 06 45 09 -16 43 02 AGC 1 BC 1929 7 129 1.4 8.44 12.60 4.16
Sextuple system
6 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Common name Sirius Constellation Canis Major SAO 151881 HIP 32349
Tycho2 5949-02777-1 HD 48915 HR 2491 GC 8833
ADS 5423 GL Gl 244A BD BD-16 1591 Bayer Alpha Canis Majoris
Bayer name Alp CMa Flamsteed 9 Canis Majoris Flamsteed name 9 CMa FK5 257
Distance 2.64 Distance ly 8.61 Bayer greek α CMa
Other names Dog Star, Aschere, Canicula, Al Shira, Sothis, Alhabor, Mrgavyadha, Lubdhaka, Tenr?sei, Sirio, Lokabrenna
Meaning burning or hot
 
 
ORBITAL ELEMENTS
 
 
Period (P)50.1284y± 0.0043 Periastron (T)1994.5715y± 0.0058 Semi-major axis (a)7.4957a± 0.0025
Eccentricity (e)0.59142± 0.00037 Inclination (i)136.336°± 0.04 Longitude of periastron (ω)149.161°± 0.075
Node (Ω)45.4°± 0.071 Notesn ReferenceBdH2017
Equinox2000 Last observation2016 Grade2(1=Definitive, 9=Indet.)
label theta rho
2000 151.2 4.460
2001 140.3 4.846
2002 131.1 5.272
2003 123.3 5.724
2004 116.6 6.188
2005 110.9 6.652
2006 105.9 7.109
2007 101.6 7.554
2008 97.7 7.982
2009 94.1 8.391
2010 91.0 8.777
2011 88.0 9.141
2012 85.3 9.479
2013 82.8 9.792
2014 80.4 10.078
2015 78.1 10.337
2016 76.0 10.567
2017 73.9 10.769
2018 71.9 10.941
2019 70.0 11.082
2020 68.1 11.193
2021 66.2 11.273
2022 64.4 11.320
2023 62.5 11.333
2024 60.7 11.313
2025 58.8 11.256
2026 57.0 11.163
2027 55.1 11.032
2028 53.1 10.861
2029 51.1 10.648
2030 48.9 10.392


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



 
 


wds06451-1643a.png orbit plot
Measures: green=micrometric, blue=interferometric, purple=photographic