06451-1643 AGC   1AB (Sirio)

 
 
06h 45m 08.92s -16 42' 58.0" P.A. 66.20 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
2020
Obs
2061
Pa first
85
Pa last
67
P.A. Now (θ)
66.2°
Sep first
10.2
Sep last
11.2
Sep. Now (ρ)
11.27"
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 Sirio 151881 06 45 09 -16 42 58 AGC 1 AB 2020 2061 66 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 151881 06 45 09 -16 43 02 AGC 1 BC 1929 7 129 1.4 8.44 12.60 4.16
Sextuple system
6 visible stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Precise pa
67
Precise sep
11.18
Common name
Sirio
Meaning
burning or hot
Other names
SIRIUS, CANICULA, DOG STAR, ASCHERE
Constellation
Canis Major
SAO
151881
HIP
32349
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
Distance
2.64
Distance ly
8.61
last precise pa
67
last precise sep
11.18
 
 
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 Note Grade2(1=Definitive, 9=Indet.)
Equinox2000 Last observation2016
label rho theta
2000 4.460 151.2
2001 4.846 140.3
2002 5.272 131.1
2003 5.724 123.3
2004 6.188 116.6
2005 6.652 110.9
2006 7.109 105.9
2007 7.554 101.6
2008 7.982 97.7
2009 8.391 94.1
2010 8.777 91.0
2011 9.141 88.0
2012 9.479 85.3
2013 9.792 82.8
2014 10.078 80.4
2015 10.337 78.1
2016 10.567 76.0
2017 10.769 73.9
2018 10.941 71.9
2019 11.082 70.0
2020 11.193 68.1
2021 11.273 66.2
2022 11.320 64.4
2023 11.333 62.5
2024 11.313 60.7
2025 11.256 58.8
2026 11.163 57.0
2027 11.032 55.1
2028 10.861 53.1
2029 10.648 51.1
2030 10.392 48.9


 
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
 
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
06451-1643 AGC 1 AB 1997 610 190 3.7 -1.46 8.50 A1Vm NODP 064509.25-164247.3
06451-1643 AGC 1 AB 2009 612 95 8.4 -1.46 8.50 A1Vm NODP 064509.25-164247.3
06451-1643 AGC 1 AB 2010 638 92 8.9 -1.46 8.50 A1Vm NODP 064508.92-164258.0
06451-1643 AGC 1 AB 2011 640 88 9.3 -1.46 8.50 A1Vm NODP 064508.92-164258.0
06451-1643 AGC 1 AB 2013 642 83 9.6 -1.46 8.50 A1Vm NODP 064508.92-164258.0
06451-1643 AGC 1 AB 2015 639 80 10.7 -1.46 8.50 A1Vm NO P 064508.92-164258.0
06451-1643 AGC 1 AB 2016 640 76 10.9 -1.46 8.50 A1Vm NO P 064508.92-164258.0

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WDS 06451-1643 AGC 1AB - SIRIO : NOTES
 
 
discov_num notes refcode
AGC 1 AB: Sirius = alp CMa = 9 CMa.
Bessel, in 1834, notes that the proper motion was variable and, in his
letter to Humboldt, stated that "..Procyon and Sirius are genuine
binary systems, each consisting of a visible and an invisible star."
Not quite invisible, this large dm pair consisting of a main sequence
A star and a white dwarf was first resolved by Alvan G. Clark on 31
January 1862 in the process of of testing the 18.5" refractor. See
notes by Burnham and Aitken. Bu_1906
The separation for the 1862.275 measurement by Lassell is reported as Lsl1862
4.92". This is clearly incorrect and not consistent with measurements
by other observers. WDS catalogers assume an factor of 2 error and
correct separation to 9.84".
Otto Struve lists a measurement of Sirius in 1861.21. However, this Stt1893a
predates the discovery of the companion Sirius B by A. Clark and his
son on 1962 Jan 31 and the first formal measurement by G. P. Bond on
1862 February 7. Comparing the uncorrected PA and separation in
Struve's table in 1893 with the measurements published by Struve, we Stt1864
suspect that 1861.21 is a typo and should refer to the observation on
1863-Mar-16.
Companion almost hidden behind secondary mirror diffraction ray from
Sirius B was never observed at these position angles until the early Sea1882
20th century. We suspect that this is a clerical error and that the
measurements pertain to another system.
For the 1882.988 measurement the PA is listed as 41.6 deg and is Bu_1883
40.6 in another. Bu_1883b
Many of the recovery observations of Sirius B following the periastron
passage after 1890 are doubtful. The recovery observations made by See1896d
See, Douglass, and Cogshall at Lowell Observatory from 1896.668 to Dgl1896
1896.695 were taken in the morning shortly before sunrise when Sirius Cog1896a
was low in the sky. See notes that the mean position angle of 220 deg
at 5.10" is about 30 deg behind its predicted location and the sep
sep is larger than expected based on previous orbit fit. Aitken and A__1896d
Schaeberle reported measurements between 1896.814-1897.027 made from Shb1897a
Lick Observatory at a significantly different mean position angle of
189 deg and 3.7". Both Aitken and Schaeberle comment that neither of
them saw a star at the position reported by Dr. See. Following the
contradictory reports, Stimson J. Brown published observations from Brs1896
his logbook that were taken earlier in March 1896 at the USNO. The
position angle is similar to the values reported by Aitken, but the
separation is about 1" larger. Brown notes that the observations were
taken under challenging conditions and he did not have much confidence
in their reliability. See later refuted his earlier measurements See1897e
after unsuccessfully searching for the companion while observing from
Mexico and then successfully detecting the companion at a pa of 175 deg
and 4.6" in September 1897 at Lowell. He writes, "The erroneous
conclusion to which I was led last year seems to have arisen from a
very unusual and entirely unexpected cause, of which we need not
speak here..." In hindsight, See also reported in that publication,
two observations from April 1895 that he initially did not think were
worthy of announcing. The difficulty in attempting to find Sirius B
using the Lick Observatory 36 inch in February and March of 1896 was
described by William J. Hussey. Hu_1896
See1900d and Brs1900d measures : "All of the observations have been See1900d
thoroughly checked. A number of errors were discovered in the earlier Brs1900d
reductions and corrected. These reductions have also been slighty See1911
changed by the adoption of a later and better determined value of a Brs1911a
revolution of the micrometer screw. This will account for small
discrepanacies between the results published here and those previously
published in the astronomical periodicals."
For the 1904.186 measuremment by T. Lewis, the title of the article, L__1904
text, and first page of the data table all refer to observations taken
in 1904. Subsequent pages of the data table (including the page that
Sirius is listed on) list an epoch of 1903. However, this is probably a
typo, so date corrected the date to be in 1904.
Sirius A. B__1959a
Hipparcos astrometric solution adopted some elements from the orbit of HIP1997d
Gatewood & Gatewood (1978). Gat1978
AB: Malkov et al. (2012) derive dynamical, photometric, and
spectroscopic masses 3.08 +/- 0.42, 2.46, and 2.19 Msun, respectively. Mlk2012
BC: Suspected by Fox in 1920, also reported by Innes, van den Bos, and A__1932a
Finsen. Other observers fail to confirm duplicity of B. Single 1945, B__1929a
1946, 1949, 1950. Recovered by Popovic in 1975 at approximately the Fin1929a
the same position as the 1929 resolutions. If these are periodic, the Pop1977b
next approximate time for resolution is 2020. Therefore, since we
believe the detections of C to be real, but likely of a background
optical interloper, BC carries a "U" code and not an "X" code.
However, very compelling argument that this is a chance allignment of Lec2000
a non-physical background star appearing close to Sirius AB is the
1920-30 time period is now assumed.
Time displacement residuals over a period of 6.8y are linear ruling Ldb1973
out a 6.4y perturbation with an amplitude of 0.14". There is no
evidence of a close companion with this nature associated with Sirius.
Otto Struve corrected his measurements for systematic errors by Stt1893a
measuring artificial double stars. He provided both the original and
corrected measures of the separation and position angle for the
companion of Sirius. Aitken cautions that the variance of the angles A__1935f
and distances compared with other observers is often larger for
Struve's corrected values. However in the case of Struve's measurements
of the companion of Sirius, Bond et al. mean residuals in the position BdH2017
angle improved when using the corrected values, while the residuals in
separation did not change significantly, so the corrected values are
reported here.
For the photographic observations by Lindenblad, tables are given for Ldb1970
the raw individual measures, while only the mean measures are corrected Ldb1973
for emulsion contraction. The average time span covered by these mean
measures is ~ 70 nights, so we used Lindenblad's tabulated scale BdH2017
corrections to compute corrected separations and position angles for
the individual measurements. We then took the mean for plates taken on
the same night, reducing the number of individual measurements from 157
down to 77 measurements on unique dates.
X coded van Albada (1962) measures corrected for emulsion contraction. vAb1971
Jasinta & Hidayat (1999) did not correct these epochs for emulsion Jas19995
contraction.
Measure of Anton corrected in a later publication. Ant2010
Ant2012
Schroeder measure re-reducted and corrected in Bond Table 2. Shd2011
BdH2017
Sirius A mass is 2.063+/-0.023 \msun with an age of 242+/-5 Myr, BdH2017
a radius of 1.7144+/-0.0090 \rsun, luminosity of 24.74+/-0.70 \lsun,
and Teff of 9845+/-64 K. Sirius B mass is 1.018+/-0.011 \msun,
an age of 224(+34-19) Myr, a radius of 0.008098+/-0.000046 \rsun,
luminosity of 0.02448+/-0.00033 \lsun and Teff of 25,369+/-46 K.
Intensity Interferometer Limb-darkened diameter 5.89 +/- 0.16 mas. HBr1974
Mk III Limb-darkened diameter 5.993 +/- 0.108 mas. MkT2003
AD: Rectilinear solution by Mason & Hartkopf (2015). Msn2015a
HL 3 AE: Rectilinear solution by Mason & Hartkopf (2015). Msn2015a
BU 1411 AF: Rectilinear solution by Mason & Hartkopf (2015). Msn2015a
 
 
REFERENCES
 
 
refcode metd author reference
A__1896d Ma - Aitken, R.G. 1896PASP....8..314A
A__1896d PASP 8, 314, 1896 (all data also in A__1896a) 1896AJ.....17...27A
A__1932a Ma - Aitken, R.G. 1932QB821.A43......
A__1932a Aitken Double Star Catalogue, 1932
A__1935f - Aitken, R.G. 1935QB821.A3.......
A__1935f The Binary Stars, 1935
Ant2010 C u Anton, R. 2010JDSO....6..133A
Ant2010 JDSO 6, 133, 2010
Ant2012 C u Anton, R. 2012JDSO....8...15A
Ant2012 JDSO 8, 15, 2012
B__1929a Ma j van den Bos, W.H. 1929CiUO...80...59V
B__1929a Union Obs. Johannesburg Circ. 80, 59, 1929
B__1959a Mb j van den Bos, W.H. 1959ApJS....4...45V
B__1959a ApJS 4, 45, 1959
BdH2017 H+ j Bond, H.E., Schaefer, G.H., Gilliland, R.L., Holberg, J.B., Mason, B.D., 2017ApJ...840...70B
BdH2017 +Po Lindenblad, I.W., Seitz-McLeese, M., Arnett, W.D., Demarque, P., Spada, F.,
BdH2017 +orb Young, P.A., Barstow, M.A., Burleigh, M.R. & Gudehus, D.
BdH2017 +not ApJ 840, 70, 2017
Brs1896 Ma j Brown, S.J. 1896AJ.....17...46B
Brs1896 AJ 17, 46, 1896
Brs1911a Ma j Brown, S.J. .
Brs1911a Pub. USNO 6, A117, 1911
Bu_1883 Ma j Burnham, S.W. (BU 864 - 1025) 1883MmRAS..47..167B
Bu_1883 MemRAS 47, 167, 1883
Bu_1883b Ma - Burnham, S.W. 1883MNRAS..43..318B
Bu_1883b MNRAS 43, 318, 1883
Bu_1906 Ma j Burnham, S.W. 1906QB821.B972.....
Bu_1906 +M Burnham Double Star Cat., 1906
Cog1896a Ma j Cogshall, W.A. 1896AJ.....16..211S
Cog1896a AJ 16, 211, 1896
Dgl1896 Ma j Douglass, A.E. 1896AJ.....17....1S
Dgl1896 AJ 17, 1, 1896
Fin1929a Ma j Finsen, W.S. 1929CiUO...80...85F
Fin1929a Union Obs. Johannesburg Circ. 80, 85, 1929
Gat1978 - Gatewood, G.D. & Gatewood, C.V. 1978ApJ...225..191G
Gat1978 ApJ 225, 191, 1978
HBr1974 - Hanbury Brown, R., Davis, J., & Allen, L.R. 1974MNRAS.167..121H
HBr1974 MNRAS 167, 121, 1974
HIP1997d orb - Hipparcos 1997yCat.1239....0E
HIP1997d Hipparcos Catalog, ESA SP-1200, 1997
HIP1997d (DMSA/O Orbital Solutions)
Hu_1896 not - Hussey, W.F. 1896PASP....8..183H
Hu_1896 PASP 8, 183, 1896
L__1904 Ma j Lewis, T. 1904RGOO...........
L__1904 Greenwich Observations, 1904 (data also in MNRAS 66, 17, 1905) 1905MNRAS..66...17L
Ldb1970 Po j Lindenblad, I.W. 1970AJ.....75..841L
Ldb1970 AJ 75, 841, 1970 (erratum in AJ 78, 226, 1973)
Ldb1973 Po j Lindenblad, I.W. 1973AJ.....78..205L
Ldb1973 AJ 78, 205, 1973
Lec2000 C - Bonnet-Bidaud, J.M., Colas, F., Lecacheux, J. 2000A&A...360...991
Lec2000 A&A 360, 991, 2000
Lsl1862 Mb j Lassell, W. 1862AN.....57..251L
Lsl1862 AN 57, 251, #1360, 1862
MkT2003 Km - Mozurkewich, D., Armstrong, J.T., Hindsley, R., Quirrenbach, A., Hummel, C.A., 2003AJ....126.2502M
MkT2003 +not Hutter, D., Johnston, K.J., Hajian, A., Elias, N.M., II, Buscher, D., & Simon, R.
MkT2003 AJ 126, 2502, 2003
Mlk2012 not - Malkov, O.Yu., Tamazian, V.S., Docobo, J.A., & Chulkov, D.A. 2012A&A...546A..69M
Mlk2012 A&A 546, A69, 2012
Msn2015a orb - Mason, B.D. & Hartkopf, W.I. 2015IAUDS.187....1M
Msn2015a +lin Inf. Circ. 187, 1, 2015
Pop1977b Ma j Popovic, G.M. 1977BOBeo.128...37P
Pop1977b Bull. Obs. Astron. Belgrade #128, 37, 1977
Sea1882 Ma - Searle, G.M. 1882AnHar..13...17.
Sea1882 Harvard Ann. 13, 17, 1882
See1896d Ma j See, T.J.J. 1896AJ.....17....1S
See1896d AJ 17, 1, 1896
See1897e Ma j See, T.J.J. 1897AJ.....18...75S
See1897e AJ 18, 75, 1897
See1900d Ma j See, T.J.J. 1900AN....153...99S
See1900d AN 153, 99, #3654, 1900
See1911 Ma j See, T.J.J. .
See1911 Pub. USNO 6, A117, 1911
Shb1897a Ma j Schaeberle, J.M. 1897AJ.....17...76S
Shb1897a AJ 17, 76, 1897
Stt1864 Ma - Struve, O. 1864MNRAS..24..149S
Stt1864 MNRAS 24, 149, 1864
Stt1893a Ma j Struve, O. 1893ObPul..10....1S
Stt1893a Pulkova Obs. Observations 10, 1, 1893
vAb1971 Pa j van Albada, G.B. 1971A&A....11..317V
vAb1971 +Po A&A 11, 317, 1971
 
 
DISCOVERER
 
 
discov author
AGC Clark, A.G.
BU Bunham, S.W.
BU Burnham, S.W.
HL Hall, A.

 
 
WDS 06451-1643 AGC 1AB - SIRIO : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 06451-1643 AGC 1AB - SIRIO : MEASURES
 
 
No records found.

 
 
WDS 06451-1643 AGC 1AB - Sirio : Virtual Eyepiece
 
 

06451-1643 AGC   1A mag -1.47 Sp A1Vm 06451-1643 AGC   1B sep 4.0 P.A. 180.00 mag 8.44 Sp DA2 06451-1643 LEC   1C sep 63.8 P.A. 29.10 mag 12.6 06451-1643 AGC   1D sep 31.6 P.A. 183.10 mag 14 06451-1643 HL    3E sep 184.1 P.A. 45.80 mag 14.5 06451-1643 BU 1411F sep 121.7 P.A. 59.70 mag 13.8 virtual eyepiece
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Radius:
 
 
WDS 06451-1643 AGC 1AB - Sirio : Aladin DSS image @ 06h 45m 08.92s -16 42' 58.0"