NGC 261

Query : NGC 261

Basic data :
NGC 261 -- HII Region
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: 		Cl* (Bruck,OGLE), HII (DEM,MCELS), IR (IRAS,LI), As* (2000AJ), G (ESO)
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) : 		00 46 31.5 -73 06 16 (Optical) [ ] D 2012ApJ...755...40P
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
FK5 coord. (ep=J2000 eq=2000) : 		00 46 31.5 -73 06 16 [ ]
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) : 		00 44 41.6 -73 22 39 [ ]
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) : 		303.4283 -44.0191 [ ]
Syntax of angular size is : "maj-axis min-axis angle (wtype) quality bibcode"
  • maj-axis : major axis size (arc minutes)
  • min-axis : minor axis size (arc minutes)
  • angle : orientation angle (in degrees)
  • (wtype) : wavelength class for the origin of the angular size (Rad, mm, IR, Opt, UV, Xray, Gam)
  • quality : flag of quality of the angular size values ( A=best quality -> E=worst quality, {� } =unknown quality)
  • bibcode : bibcode of the angular size reference
Angular size (arcmin): 		1.30 1.10 100 (~) D 2000AJ....119.1214B
SIMBAD within arcmin
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within 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!). sed-help-icon
Some important notes on this object about identifications and objects associations.
notes:

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

: 1
The count displayed here is the number of children objects.
The list obtained by clicking the button may be larger, as some children may be linked with different references or probability.

%This number is the number of distinct objets linked, by using this button, you will obtain all links (may be more than one) from that object to his children

: 1 		: 18172 Display criteria :

The link on the acronym of the identifiers give access to the information for this acronym in the dictionary of nomenclature.
Identifiers (9) :
An access of full data is available using the icon Vizier near the identifier of the catalogue

NGC 261 ESO 29-12 LI-SMC 36
Bruck 42 IRAS 00447-7322 MCELS S-31
DEM S 23 IRAS F00447-7322 OGLE-CL SMC 34

References (4 between 2019 and 2024) (Total 63)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).
Follow new references on this object
                Reference summaries :

                from: to:

                 or select by : (not exhaustive, explanation here)

Observing logs


ISO : 12   

   

Warning : measurements from IRAS, IRC, SAO, CL.g (ACO), GJ have been removed
(they are still available using the icon Vizier near the identifier of the catalogue, or at the bottom of the page in the section "External links" to get the full data)

iso (12)

The 2 columns in color are computed by VizieR, and are not part of the original data.
Note: Quick-look images of the data, and specific documentation, are accessible by clicking on the TDT observation identifier
VI/111/isolog
Post annotation 		ISO Observation Log (ISO Data Centre, 2004) [ReadMe+ftp]

*The ISO Observation Log[image] (36737 rows) (Note)		img(gal)
start AladinLite 
 Full      _r        TDT    AOT    minLam  maxLam  Target                                 oStart         oLen    recno   FOV                  RAJ2000   DEJ2000 cal  ObsID    abs  PropID  
        arcmin                      um      um                                             s             s                                     deg       deg                              


    1     0.215  66300214  SWS01    2.38   45.21  LIRS36                          1997-09-08T19:45:47   1912     27984  33"x20"             011.6339  -73.1009      JVDHULST +    ISM_LGR1
    2     0.636  66204965  CAM01    5.05   17.05  SMC L36                         1997-09-08T11:38:13    696     27980  228"x228"           011.6674  -73.1029      LVIGROUX +    CAMSPIR 
    3     0.637  53301113  LWS02   44.98  175.73  LIRS 36LWS comp                 1997-05-02T10:37:29    458     22526  84" D               011.6674  -73.1028      DLEMKE   +    ISDUST11
    4     0.638  41101928  PHT18   19.80   28.38  LIRS 36                         1996-12-31T22:10:08     30     17496  77" D               011.6675  -73.1029      DLEMKE   +    ISDUST11
    5     0.638  41102038  PHT38  128.33  216.69  LIRS 36                         1996-12-31T22:21:22     66     17501  181.4"x181.4"       011.6675  -73.1029      DLEMKE   +    ISDUST11
    6     0.638  41102123  PHT18    4.09   15.96  LIRS 36                         1996-12-31T22:41:28    156     17506  77" D               011.6675  -73.1029      DLEMKE   +    ISDUST11
    7     0.638  41102233  PHT18   54.23  117.55  LIRS 36                         1996-12-31T23:02:26     60     17511  77" D               011.6675  -73.1029      DLEMKE   +    ISDUST11
    8     0.639  15700257  SWS02    2.39   36.31  LIRS 36                         1996-04-22T00:27:03   3342      6134  33"x20"             011.6676  -73.1029      JVDHULST +    ISM_LGR1
    9     0.639  15700258  PHT40    2.47    8.95  LIRS 36                         1996-04-22T01:23:27    236      6135  24"x24"             011.6676  -73.1029      JVDHULST +    ISM_LGR1
   10     0.639  15700259  PHT22   54.76  216.69  LIRS 36                         1996-04-22T01:28:07    422      6136  181.4"x181.4"       011.6676  -73.1029      JVDHULST +    ISM_LGR1
   11     0.673  13602316  LWS01   43.02  195.91  LIRS 36                         1996-04-01T16:45:50    812      5229  84" D               011.6695  -73.1028      MJOUBERT +    ISM_IC  
   12    16.198  11700813  CAM01    5.05   17.05  SMC L36                         1996-03-13T08:16:53    704      4393  228"x228"           011.5980  -73.3742      LVIGROUX +    CAMSPIR

External archives :

Data at NED - NASA/IPAC Extragalactic Database : NGC 261

Link by name to the catalogue in VizieR :

NGC 261 IRAS 00447-7322 IRAS F00447-7322

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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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