* tau CMa

Query : * tau CMa
C.D.S. - SIMBAD4 rel 1.7 - 2021.02.27CET20:37:39

Available data : Basic data  •  Identifiers  •  Plot & images  •  Bibliography  •  Measurements  •  External archives  •  Notes  •  Annotations


Basic data :
* tau CMa -- Eclipsing binary of beta Lyr type
Origin of the objects types :

(Ref) Object type as listed in the reference "Ref"
(acronym) Object type linked to the acronym according to the original reference
() Anterior to 2007, before we can link the objet type to a reference, or given by the CDS team in some particular cases

Other object types:
* (*,ALS,...), ** (**,ADS,...), V* (CSV,NSV,...), IR (IRAS,2MASS,...), UV (CEL,EUVE,...), X (2E,1ES,...), SB* (SBC7,SBC9), bL* (2003AstL), pr* (MPCM)
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
ICRS coord. (ep=J2000) :
07 18 42.4864191 -24 57 15.741299 (Optical) [ 0.28 0.41 90 ] A 2007A&A...474..653V
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
FK4 coord. (ep=B1950 eq=1950) :
07 16 38.0231147 -24 51 42.814216 [ 0.28 0.41 90 ]
Syntax of coordinates is : "ra dec (wtype) [error ellipse] quality bibcode" :
  • ra dec : right ascension and declination (unit and frame defined according to your Output Options)
    Grey values are increasing the original precision due to the computation of frame transformations
  • (wtype) : wavelength class for the origin of the coordinates (Rad, mm, IR, Optical, UV, Xray, Gam)
  • [error ellipse] : measurement uncertainty, on (ra,dec) if the positional angle is 90 degrees, on (majaxis,minaxis) otherwise (in mas at defined epoch in the original catalogue),
    position angle (in degrees North celestial pole to East)
  • quality : flag of quality
    • E ≥ 10"
    • D : 1-10" (and some old data)
    • C : 0.1-1"
    • B : 0.01-0.1" + 2MASS, Tyc
    • A : VLBI, Hipparcos
  • bibcode : bibcode of the coordinates reference
Gal coord. (ep=J2000) :
238.1809282329 -05.5429608174 [ 0.28 0.41 90 ]
Syntax of proper motions is : "pm-ra pm-dec [error ellipse] quality bibcode"
  • pm-ra : mu-ra*cos(dec) (expressed in the ICRS system in mas/yr)
  • pm-dec : mu-dec (expressed in the ICRS system in mas/yr)
  • [error ellipse] : error major axis and minor axis (in mas), orientation angle (in deg)
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the proper motion reference
Proper motions mas/yr :
-2.31 5.02 [0.40 0.55 90] A 2007A&A...474..653V
Syntax of radial velocity (or/and redshift) is : "value [error] (wavelength) quality bibcode"
  • value : radial velocity or/and redshift (Heliocentric frame) according to your Output Options
    (redshift may be not displayed if the data value is <0 and the database inside value is a radial velocity)
  • [error] : error of the corresponding value displayed before
  • (wavelength) : wavelength range of the measurement : Rad, mm, IR, Opt, UV, Xray, Gam or  '∼'(unknown)
  • quality : flag of quality ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the value's origin
Radial velocity / Redshift / cz :
V(km/s) 49.40 [1.4] / z(spectroscopic) 0.000165 [0.000005] / cz 49.40 [1.40]
   (Opt) B 1977ApJ...214..759C
Syntax of parallax is : 'value quality [error] bibcode'
  • value : parallax value
  • quality : flag of quality (A=best quality -> E=worst quality, {� } =unknown quality)
  • [error] : mean error
  • bibcode : bibcode of the parallax reference
Parallaxes (mas):
1.09 [0.59] A 2007A&A...474..653V
Spectral type is made of 3 parts: %coding is composed of 4 parts :
  • the spectral type, which is made of a temperature class, eventually a luminosity class (roman number) and/or spectral peculiarities;
  • a quality letter: A=best quality→E=worst quality, {� } =unknown quality %
  • a quality letter: A=best quality -> E=worst quality, {� } =unknown quality
  • bibcode : bibcode of the spectral type reference
Spectral type:
O9II C 2014ApJS..211...10S
Syntax of fluxes (or magnitudes) is : "filter-name (System) flux-value [error] quality MultVarFlags bibcode"
  • filter-name : U, B, V, R, I, G, J, H, K, u, g, r, i, z
  • (System) : may be AB (default is Vega)
  • flux-value : value of flux or magnitude
  • [error] : error value
  • quality : flag of quality of the flux value ( A=best quality -> E=worst quality, {� } =unknown quality)
  • MultVarFlags : Mult is zero or one char (J) for joined photometry ; Var can be zero or two chars (V[0-4])
  • bibcode : bibcode of the flux reference
Fluxes (8) :
U 3.26 [~] C 2002yCat.2237....0D
B 4.25 [~] C 2002yCat.2237....0D
V 4.40 [~] C 2002yCat.2237....0D
R 4.44 [~] C 2002yCat.2237....0D
I 4.62 [~] C 2002yCat.2237....0D
J 4.71 [~] C 2002yCat.2237....0D
H 4.769 [0.076] C 2003yCat.2246....0C
K 4.786 [0.024] C 2003yCat.2246....0C
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within radius arcsec The VizieR photometry tool allows for easy visualization of photometry points extracted around the Simbad position from photometry-enabled catalogues in VizieR.
The search radius has to be specified by the user. It is currently limited to a maximum of 30 arcsec. It depends mostly on the precision or quality of the coordinates (SIMBAD and VizieR catalogs), the resolution of the images from which the sources were extracted, source extent, and source crowding.
Suggestions are: crowded field: 0.5 to 1.5 arcsec, 3 arcsec otherwise; uncertain coordinates (SIMBAD quality E or coordinates without reference): 5 to 30 arsec (risky!).

Hierarchy : number of linked objects
whatever the membership probability is (see description here ) :

: 1 : 445 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (56) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

* tau CMa 2E 0716.6-2451 JP11 4017 SKY# 13269
* 30 CMa 1ES 0716-24.8 2MASS J07184249-2457157 SSTGLMA G238.1809-05.5428
** FIN 313 EUVE J0718-24.9 MCW 527 TD1 9746
** TOK 42 GC 9736 MPCM J071842.48-245715.8 TIC 106347931
** HJ 3948A GCRV 4843 NGC 2362 23 TYC 6541-4204-1
ADS 5977 A GEN# +2.23620023 NSV 3528 UBV 7106
ALS 14805 GOS G238.18-05.54 01 PMSC 07146-2446AP UBV M 32429
CCDM J07187-2457AP GSC 06541-04204 PMSC 07146-2446Aabc V* tau CMa
CD-24 5176 HD 57061 PPM 252114 WDS J07187-2457Aa,Ab
CEL 1763 HIC 35415 ROT 1174 WDS J07187-2457A
CGO 156 HIP 35415 1RXS J071841.7-245707 WEB 7067
CPD-24 2216 HR 2782 SAO 173446 [GM99b] 35
CSV 6576 IDS 07146-2446 SBC7 302 [HJ56] 103
2E 1804 IRAS 07166-2451 SBC9 444 AAVSO 0714-24

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References (401 between 1850 and 2021) (Total 401)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
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                Reference summaries :

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Collections of Measurements


velocities : 107    ROT : 5    PM : 3    Fe_H : 3    PLX : 2    MK : 26    V* : 1   

   

Observing logs


herschel : 2    IUE : 20   

   


External archives :

Archive data at HEASARC - High-Energy Astrophysics Science Archive Research Center

Data at NED - NASA/IPAC Extragalactic Database : * tau CMa

Link by name to the catalogue in VizieR :

ALS 14805 CCDM J07187-2457AP CD-24 5176 CEL 1763 CPD-24 2216
2E 1804 EUVE J0718-24.9 GSC 06541-04204 HD 57061 HIC 35415
HIP 35415 HR 2782 IRAS 07166-2451 2MASS J07184249-2457157 NSV 3528
PPM 252114 1RXS J071841.7-245707 SAO 173446 SSTGLMA G238.1809-05.5428 TD1 9746
TYC 6541-4204-1 V* tau CMa WDS J07187-2457Aa,Ab WDS J07187-2457A

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Annotations :
Annotations allow a user to add a note or report an error concerning the astronomical object and its data. It requires registration to post a note. See description .
Please, have a look at Best practices. The list of all annotations to SIMBAD objects can be found here .

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2021.02.27-20:37:39

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