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Doubles in session


Current system
07187-2457
HJ 3948 AB
Tau CMa


Nearby doubles
6' : 07184-2459
FGS 12

7' : 07192-2457
B 133

9' : 07188-2449
BRT2893

9' : 07193-2453
B 134

9' : 07189-2506
TDS4705

16' : 07199-2500
B 2142

18' : 07188-2440
B 2140

19' : 07193-2441
HDS1022

19' : 07190-2439
B 2141

22' : 07178-2515
TDS4683

24' : 07178-2439
BRT2890

27' : 07181-2432
TDS4688

28' : 07183-2431
TDS 353

29' : 07169-2513
TDS4670

32' : 07177-2526
RST2468

33' : 07195-2527
BRT2895

35' : 07196-2530
B 717

37' : 07161-2507
RST3505

37' : 07186-2421
TDS4700

38' : 07200-2425
BU 331

40' : 07169-2427
TDS4669

40' : 07184-2537
BRT2892

46' : 07160-2523
TDS4648

47' : 07219-2513
TDS 363

47' : 07218-2517
TDS4739

51' : 07208-2416
TDS4722



Selections
Full WDS
Binocular doubles
Binary Systems
Triple Systems
Quadruple Systems
Multiple Systems
Neglected List I
Neglected List II
Observed
Herschel, W.
Herschel, J.F.W.
Struve, Otto
Struve, F.G.W.

07187-2457 HJ 3948 AB (Tau CMa)

 
 
07h 18m 42.49s -24° 57' 15.8" P.A. 90.00 sep 8.3 mag 4.42,10.20 Sp O9II dist. 917.43 pc (2992.66 l.y.)
 
 
Coord 2000 07187-2457 Discov num HJ 3948 Comp AB Coord arcsec 2000 07 18 42.49 -24 57 15.8
Date first 1835 Date last 2015 Obs 14
Pa first 86 Pa last 90.2 P.A. Now (θ) 90.2°
Sep first 8.0 Sep last 8.314 Sep. Now (ρ) 8.314"
Mag pri 4.42 Mag sec 10.20 delta mag (ΔM) 5.78 Spectral class O9II (blue)
Pri motion ra -002 Sec motion ra
Pri motion dec -001 Sec motion dec
Notes N (See Notes)
Nature of this double is uncertain.
 
 
07187-2457 SYSTEM COMPONENTS
 
 
Show name SAO coord wds_name last obs pa sep mag1 mag2 d_mag orb current
Show 173446 07 18 42 -24 57 16 FIN 313 Aa,Ab 2018 48 131 0.1 4.89 5.33 0.44
Show Tau CMa 173446 07 18 42 -24 57 16 HJ 3948 AB 2015 14 90 8.3 4.42 10.20 5.78 <===
Show 173446 07 18 42 -24 57 16 HJ 3948 AC 2002 9 87 14.2 4.42 11.20 6.78
Show 173446 07 18 42 -24 57 16 HJ 3948 AD 2020 13 78 83.5 4.42 8.22 3.80
Show 173446 07 18 42 -24 57 16 TOK 42 AE 2018 12 87 0.9 5.33 9.70 4.37
Sextuple system
5 estimated visually detectable stars in this system
 
 
OTHER CATALOGS AND DESIGNATIONS
 
 
Name Tau CMa Var name NSV3528 CMa Constellation Canis Major SAO 173446
HIP 35415 Tycho2 6541-04204-1 Gaia DR2 5616537013676667392 HD 57061
HR 2782 GC 9736 ADS 5977 CD CD-24 5176
CP CP-24 2216 Bayer Tau Canis Majoris Bayer name Tau CMa Flamsteed 30 Canis Majoris
Flamsteed name 30 CMa Distance 917.43 Distance ly 2992.66 Bayer greek τ CMa
 
 
WDS 07187-2457 HJ 3948 AB (Tau CMa) : NOTES
 
 
discov_num notes refcode
FIN 313 A: 30 CMa = tau CMa. A is Beta Lyrae-type system, probably variable.
See discussion of the system by Sana et al. 2014). Sna2014
HJ 3948 van Leewen & van Genderen (1997 A&A 327, 1070) and Stickland et al. Stc1999
(1999) argue that the brighter Aa component of the visual Aa,Ab binary
is a triple system consisting of a close 1.28-day eclipsing system
orbiting a distant O star (the spectroscopic binary with a period of
154.9 d). The visual Aa,Ab pair has slowly decreased in separation
from 0".19 to 0".15 between 1977 and 1994. Msn1998a
Classification of the D component is from Hoffleit & Warren (1991). Hof1991
1996.155: Date from J. Christou (private communication).
 
 
REFERENCES
 
 
refcode metd author reference
Hof1991 - Hoffleit, D. & Jaschek, C. 1991bsc..book.....H
Hof1991 The Bright Star Catalogue, Fifth Revised Edition (preliminary version), 1991
Msn1998a Sc j Mason, B.D., Gies, D.R., Hartkopf, W.I., Bagnuolo, Jr., W.G., 1998AJ....115..821M
Msn1998a ten Brummelaar, T.A., & McAlister, H.A.
Msn1998a AJ 115, 821, 1998
Sna2014 Kv j Sana, H., LeBouquin, J.-B., Lacour, S., Berger, J.-P., Duvert, G., Gauchet, L., 2014ApJS..215...15S
Sna2014 +A Norris, B., Olofsson, J., Pickel, D., Zins, G., Absil, O., de Koter, A.,
Sna2014 Kratter, K., Schnurr, O., & Zinnecker, H.
Sna2014 ApJS 215, 15, 2014
Sna2014 (NACO companions in Table 6 assumed physical if quoted probability of spurious
Sna2014 detection <10%, optical if >90%, otherwise indeterminate)
Stc1999 not - Stickland, D.J., Lloyd, C., & Sweet, I. 1999Obs...118....7S
Stc1999 Observatory 118, 7, 1999
 
 
DISCOVERER
 
 
idgroup discov author
1 FIN Finsen, W.S.
171 HJ Herschel, J.F.W.
220 TOK Tokovinin, A.A.
267 TOK Tokovinin, A.A., Balega, Y.Y., Pluzhnik, E.A., Shatsky, N.I., Gorynya, N.A., &
267 TOK Weigelt, G.
281 TOK Tokovinin, A., Cantarutti, R., Tighe, R., Schurter, P., van der Bliek, N.,
281 TOK Martinez, M., & Mondaca, E.
349 TOK Tokovinin, A., Corbett, H., Fors, O., Howard, W., Law, N.M., Moe, M.,
349 TOK Ratzloff, J. & Walter, F.M.
 
 
WDS HISTORIC DATA
 
 
coord_2000 discov_num comp epoch obs pa sep mag_pri mag_sec spectr notes coord_arcsec_2000
07187-2457 HJ 3948 AB 2002 13 93 8.6 4.42 10.20 O9II N D 071842.49-245715.8
07187-2457 HJ 3948 AB 2015 14 90 8.3 4.42 10.20 O9II N 071842.49-245715.8

If you need more information about this double, apply for a data request form to the WDS.

 
 
WDS 07187-2457 HJ 3948 AB (Tau CMa) : VISUAL OBSERVATIONS REPORTS
 
 
No records found.


 
 
WDS 07187-2457 HJ 3948 AB (Tau CMa) : MEASURES
 
 
No records found.

 
 
WDS 07187-2457 (Tau CMa) : VIRTUAL EYEPIECE
 
 

07187-2457 HJ 3948A mag 4.42 Sp O9II 07187-2457 FIN 313Ab sep 0.1 P.A. 133.80 mag 5.33 07187-2457 HJ 3948B sep 7.5 P.A. 90.20 mag 10.2 07187-2457 HJ 3948C sep 12.9 P.A. 86.60 mag 11.2 07187-2457 HJ 3948D sep 76.0 P.A. 76.80 mag 8.22 07187-2457 TOK 42E sep 0.8 P.A. 86.90 mag 9.7 virtual eyepiece
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Radius:
Components only
 
 
WDS 07187-2457 (Tau CMa) : ALADIN DSS IMAGE @ 07h 18m 42.49s -24° 57' 15.8"
 
 
 
 
WDS 07187-2457 HJ 3948 AB (Tau CMa) : NEIGHBORHOODS
 
 
FoV:
Limit:
Primaries only

07187-2457 HJ 3948AB distance=0' 07184-2459 FGS 12 distance=6' 07192-2457 B 133 distance=7' 07188-2449 BRT2893 distance=9' 07193-2453 B 134 distance=9' 07189-2506 TDS4705 distance=9' 07199-2500 B 2142 distance=16' 07188-2440 B 2140 distance=18' 07193-2441 HDS1022 distance=19' 07190-2439 B 2141 distance=19' 07178-2515 TDS4683 distance=22' 07178-2439 BRT2890 distance=24' 07181-2432 TDS4688 distance=27' 07183-2431 TDS 353 distance=28' 07169-2513 TDS4670 distance=29' 07177-2526 RST2468 distance=32' 07195-2527 BRT2895 distance=33' 07196-2530 B 717 distance=35' 07161-2507 RST3505 distance=37' 07186-2421 TDS4700 distance=37' 07200-2425 BU 331 distance=38' 07169-2427 TDS4669 distance=40' 07184-2537 BRT2892 distance=40' 07160-2523 TDS4648 distance=46' 07219-2513 TDS 363 distance=47' 07218-2517 TDS4739 distance=47' 07208-2416 TDS4722 distance=51' 07221-2523 TDS4743 distance=53' 07216-2534 TDS 362 distance=55' 07196-2401 ARA2043AB distance=58' 07196-2401 ARA2043AC distance=58' 07196-2401 ABH 63AD distance=58' 07196-2401 ABH 63AE distance=58' 07196-2401 ABH 63AF distance=58' 07196-2401 ABH 63AG distance=58' 07145-2504 TDS4615 distance=58' 07190-2555 WFC 265 distance=58' 07195-2554 TDS4708 distance=58' 07146-2518 B 2138 distance=60' 07159-2546 B 714 distance=62' 07178-2559 BRG 26BC distance=63' 07178-2559 SEE 75AB distance=64' 07178-2559 BRG 26Aa,Ab distance=64' 07158-2546 TDS4643 distance=64' 07228-2531 BRT2897 distance=65' 07200-2600 TDS4714 distance=65' 07235-2457 B 2625 distance=66' 07222-2412 HJ 9002AB distance=66' 07222-2412 SHT 8AC distance=66' 07222-2412 SHT 8AD distance=66' 07193-2602 TDS4706 distance=66' grafico limitrofi
Click on the map to see the double of your interest.
Pass over with the mouse cursor to display the catalog designation.
Show name coord_2000 discov# comp pa sep dist(')
Show 07187-2457 FIN 313 Aa,Ab 131 0.1
Show 07187-2457 HJ 3948 AB 90 8.3
Show 07187-2457 HJ 3948 AC 87 14.2
Show 07187-2457 HJ 3948 AD 78 83.5
Show 07187-2457 TOK 42 AE 87 0.9
Show 07184-2459 FGS 12 112 0.5 6
Show 07192-2457 B 133 100 4.8 7
Show 07188-2449 BRT2893 181 4.9 9
Show 07193-2453 B 134 98 1.2 9
Show 07189-2506 TDS4705 59 0.7 9
Show 07199-2500 B 2142 214 6.7 16
Show 07188-2440 B 2140 112 7.5 18
Show 07193-2441 HDS1022 341 1.6 19
Show 07190-2439 B 2141 158 5.7 19
Show 07178-2515 TDS4683 210 1.5 22
Show 07178-2439 BRT2890 128 7.1 24
Show 07181-2432 TDS4688 184 0.9 27
Show 07183-2431 TDS 353 324 1.1 28
Show 07169-2513 TDS4670 170 2.7 29
Show 07177-2526 RST2468 255 0.4 32
Show 07195-2527 BRT2895 301 3.6 33
Show 07196-2530 B 717 41 2.4 35
Show 07161-2507 RST3505 71 1.3 37
Show 07186-2421 TDS4700 103 0.4 37
Show 07200-2425 BU 331 117 2.0 38
Show 07169-2427 TDS4669 241 0.7 40
Show 07184-2537 BRT2892 309 3.0 40
Show 07160-2523 TDS4648 289 2.2 46
Show 07219-2513 TDS 363 233 1.6 47
Show 07218-2517 TDS4739 208 1.8 47
Show 07208-2416 TDS4722 47 0.5 51
Show 07221-2523 TDS4743 78 1.5 53
Show 07216-2534 TDS 362 6 1.1 55
Show 07196-2401 ARA2043 AB 290 9.7 58
Show 07196-2401 ARA2043 AC 5 8.5 58
Show 07196-2401 ABH 63 AD 121 121.1 58
Show 07196-2401 ABH 63 AE 83 100.3 58
Show 07196-2401 ABH 63 AF 75 130.4 58
Show 07196-2401 ABH 63 AG 115 116.8 58
Show 07145-2504 TDS4615 351 0.4 58
Show 07190-2555 WFC 265 102 11.2 58
Show 07195-2554 TDS4708 351 0.4 58
Show 07146-2518 B 2138 180 9.5 60
Show 07159-2546 B 714 62 1.8 62
Show 07178-2559 BRG 26 BC 127 5.6 63
Show 07178-2559 SEE 75 AB 7 13.2 64
Show 07178-2559 BRG 26 Aa,Ab 312 0.1 64
Show 07158-2546 TDS4643 17 2.0 64
Show 07228-2531 BRT2897 93 5.3 65
Show 07200-2600 TDS4714 121 0.8 65
Show 07235-2457 B 2625 301 12.7 66

 
 
WDS 07187-2457 : COMPONENTS
 
 
  A Ab B C D
Ab pa=133.8°
sep=0.10"
 
B pa=90.2°
sep=7.54"
pa=89.7°
sep=7.47"
 
C pa=86.6°
sep=12.88"
pa=86.3°
sep=12.81"
pa=81.5°
sep=5.38"
 
D pa=76.8°
sep=76.01"
pa=76.7°
sep=75.96"
pa=75.3°
sep=68.70"
pa=74.8°
sep=63.36"
 
E pa=86.9°
sep=0.85"
pa=81.8°
sep=0.79"
pa=270.6°
sep=6.69"
pa=266.6°
sep=12.03"
pa=256.7°
sep=75.18"
 
 
07187-2457 A
 
 
Name Tau CMa Coord arcsec 2000 071842.49-245715.8 Mag 4.42 Spectral class O9II (blue)
PmRA -2.00 PmDE -1.0 SAO 173446 HIP 35415
Tycho2 6541-04204-1 HD 57061 HR 2782 GC 9736
CD CD-24 5176 CP CP-24 2216 Bayer Tau Canis Majoris Bayer name Tau CMa
Flamsteed 30 Canis Majoris Flamsteed name 30 CMa
Tycho2
Tycho2 6541-04204-1 Pflag X RAmdeg DEmdeg
PmRA PmDE E RAmdeg E DEmdeg
E pmRA E pmDE EpRAm EpDEm
Num Q RAmdeg Q DEmdeg Q pmRA
Q pmDE BTmag 4.193 E BTmag 0.014 VTmag 4.383
E VTmag 0.009 Prox 569 TYC T HIP 35415
CCDM AP RAdeg 109.67703083 DEdeg -24.95438417 EpRA 1990 1.66
EpDE 1990 1.78 E RAdeg 3.2 E DEdeg 3.1 Posflg P
Corr -0.2
SAO
SAO 173446 DelFlag RA1950 PmRA1950 -0.001
DE1950 PmDE1950 0.008 Vmag 4.4 SpType Oe5
Double code Source 70 CatNum 9736 DM CD-24 5176
DMcomp BDsup HD 57061 M HD 0
GC 9736 RA1950rad 1.90517275 DE1950rad -0.43392058 PmRA2000 -0.0007
PmDE2000 0.011
Hipparcos
Catalog H HIP 35415 Proxy H RAhms 07 18 42.49
DEdms -24 57 15.8 Vmag 4.37 VarFlag 1 R Vmag H
RAdeg 109.677 DEdeg -24.9544 AstroRef * Plx 1.02
CCDM 07187-2457 N CCDM I Nsys 1 Ncomp 2
MultFlag C Source Qual A M HIP PA
Theta 299 Rho 0.151 HD 57061 BD
CD CD-24 5176 CP CP-24 2216 Dm number -24 5176 VIred -0.1
SpType O9Ib R SpType Coord arcsec 2000 071842.49-245715.8
Hipparcos 2
HIP 35415 Sn 55 So 3 Nc 2
RArad 1.9142253386 DErad -0.4355361773 Plx 1.09 PmRA -2.31
PmDE 5.02 E RArad 0.28 E DErad 0.41 E Plx 0.59
E pmRA 0.4 E pmDE 0.55 Hpmag 4.3329 E Hpmag 0.0013
SHp 0.02 VA 1 BV -0.132 E BV 0.03
VI -0.1
CCDM
Ccdm 07187-2457 RComp Comp A Note1
Note2 Discov num DRAs 0.46 DDEs -15.4
R dRAs 10 Year Theta Rho
Obs 5 Vmag 4.4 Sp Oe PmNote *
PmRA -11 PmDE 6 Dm number -24 5176 Cat1 CD
Name2 173446 Cat2 SAO HD 57061 M HD
ADS BDS A 5977 M ADS BDS N IDS IDS 07146S2446A
HIC 35415
 
 
07187-2457 Ab
 
 
Coord arcsec 2000 071842.50-245715.9 Mag 5.33 Calc delta mag 0.44 Calc coord yes
 
 
07187-2457 B
 
 
Coord arcsec 2000 071843.04-245715.8 Mag 10.2 Calc delta mag 5.31 Calc coord yes
CCDM
Ccdm 07187-2457 RComp Comp B Note1
Note2 Discov num HJ 3948 DRAs DDEs
R dRAs Year 1876 Theta 090 Rho 8.2
Obs 9 Vmag 10.5 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A 5977 M ADS BDS N IDS IDS 07146S2446B
HIC 35415
 
 
07187-2457 C
 
 
Coord arcsec 2000 071843.44-245715.0 Mag 11.2 Calc delta mag 6.31 Calc coord yes
CCDM
Ccdm 07187-2457 RComp Comp C Note1
Note2 Discov num HJ 3948 DRAs DDEs
R dRAs Year 1876 Theta 079 Rho 14.5
Obs 5 Vmag 11.2 Sp PmNote
PmRA PmDE Dm number Cat1
Name2 Cat2 HD M HD
ADS BDS A 5977 M ADS BDS N IDS IDS 07146S2446C
HIC 35415
 
 
07187-2457 D
 
 
Coord arcsec 2000 071847.93-245658.4 Mag 8.22 PmRA 14.00 PmDE 10.0
Calc delta mag 3.33 Calc coord yes
CCDM
Ccdm 07187-2457 RComp Comp D Note1
Note2 Discov num HJ 3948 DRAs DDEs
R dRAs Year 1834 Theta 074 Rho 85.0
Obs 4 Vmag 8.8 Sp PmNote
PmRA PmDE Dm number -24 5180 Cat1 CD
Name2 Cat2 HD M HD
ADS BDS A 5977 M ADS BDS N IDS IDS 07146S2446D
HIC
 
 
07187-2457 E
 
 
Coord arcsec 2000 071842.55-245715.8 Mag 9.7 Calc delta mag 4.81 Calc coord yes