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 |
|
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 |
Notes | n | |
Reference | BdH2017 | |
| Equinox | 2000 | |
Last observation | 2016 | |
Grade | 2 | (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 |
|
|
Note: Theta is PA, Rho is Sep. For yearly orbits, data refer to Jan 1st.
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Measures: green=micrometric, blue=interferometric, purple=photographic |
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