LHA 120-N 11B

Basic data :
NGC 1763 -- Association of Stars 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* ([SL63]), As* (LH), EmO (LHA) 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) : 04 56 51.5 -66 24 25 [ ] D 2006MNRAS.372.1509O 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) : 04 56 45.3 -66 28 58 [ ] 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) : 277.1784 -36.0596 [ ] 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 (1) : V 9.40 [~] E ~	SIMBAD within arcmin ', {sourceSize:12, color:'#30a090'})); aladin.on('objectClicked', function(object) { var objName=object.data.MAIN_ID; aladin.showPopup(object.ra,object.dec,'',''+ objName+''); });" title="Show Simbad objects"> Overlay points in this preview 2MASS DSS SDSSXMMIRACIRISGALEX All (CDSPortal) Send to 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!).
Some important notes on this object about identifications and objects associations. notes: Ass.+nebula A bi-lobed complex of HII regions and star clusters in the LMC, possibly including IC 2115 and IC 2116; see also Corwin's notes

NGC 1763

LHA 120-N 11B

LH 10

[SL63] 125

References (162 between 1850 and 2023) (Total 162) 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

Observing logs

External archives :

Data at NED - NASA/IPAC Extragalactic Database : LHA 120-N 11B

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• Confusion exists in the HD and supplement between the stars HD 32256, HD 32279, HD 32340, HD 268715, and the nebulae IC 2115, IC 2116, NGC 1763, NGC 1769, and LHA 120-N 11A. Argumentations from Brian Skiff (2007-11-28):

  I have had another look at the ID problems in the region of NGC 1763 that includes HD 32256, 32279, and 32340. As mentioned previously, the early Harvard coordinates are relatively poor, so a definitive answer may not be had without reference to the original logbooks, plate-marks, etc. All coordinates mentioned below are for J2000. It is helpful to look at the DSS short-V plate-scan with some sort of coordinates reference (Aladin, SkyView, etc) to see the bright stars/nebulae that would have been all that was detected by the Harvard observers. The various deep sky-survey exposures have the nebulae too overexposed. Also useful is the large-scale chart drawn by Mati Morel and contained in his "LMC selected areas" charts (chart 6 in this publication).

  The HD catalogue coordinates and description for HD 32256 seem to apply to the western lobe of the nebula NGC 1763. The HD links this specifically with the nebulous object CPD-66 344 (CPD coords 4 56 45.5 -66 24 36). The HD description mentions that a strong continuum is present along with emission lines, including the remark that "the spectrum may belong to the P Cygni class." So evidently the constituent star(s) were observed. Thus it seems reasonable to give it the position (rounded to some convenient degree) of PGMW 3120, which is a bright clump of O-type stars at: 4 56 45.80 -66 24 46.8, with the intention that this represent the western lobe of the nebula. This is just 4" from the CPD position, which is clearly what was measured for the CPD itself. Not entirely incidentally, the second clump about 30" SW is unambiguously HD 268715 at: 4 56 43.24 -66 25 02.6, some 29" from the CPD position.

  For HD 32279, the HD coordinates and spectral type (Pc = emission nebula) seem to apply to the eastern lobe of NGC 1763. The nominal coordinates are on the north side of this lobe (4 57 00 -66 22.9). The HD remarks say this is IC 2115, which may be correct! Again for the sake of having some reproducible position assigned to the HD (and IC?) object, I adopt the position of PGMW 3223, one of the O-type stars/clumps near the center of the nebula (4 57 00.86 -66 24 25.1). Round-off as desired. Again the nearby star/clump to the southwest is unambiguously HD 268721 (4 56 58.97 -66 24 38.2), which is very similar in brightness.

  Now, the HD position for HD 32340 precesses to: 4 57 30 -66 24.0. This is about 90" southeast of the compact nebula IC 2116 = LHA 120-N 11A at: 4 57 16.25 -66 23 20.8. Since the discovery is from objective-prism plates (the HD and IC objects are the same object from the same report), we have to assume the object was compact enough to produce a recognizable spectrum on the plates. This argues for this object rather than NGC 1769, which is what is specified in the HD remarks, and which lies about 4' off to the southeast, and which has HD 268743 as its illuminating star (a cluster actually). Nearby to the west of IC 2116 is the non-emission star HD 268726 (4 57 08.82 -66 23 25.2), which has no identification problem. Lacking emission in the HDE type and in modern spectra, it cannot be IC 2115 or 2116.

  In summary:

  HD 32256 = NGC 1763-west: 4 56 46 -66 24.8 (J2000)

  HD 32279 = NGC 1763-east = ? IC 2115: 4 57 01 -66 24.1 (J2000)

  HD 32340 = IC 2116 = LHA 120-N 11A: 4 57 16.25 -66 23 20.8 (2MASS, J2000)

  I think this all hangs reasonably well. The Harvard source positions are soft enough that it is possible to conclude that IC 2115 is actually LHA 120-N 11A, which then forces the identity NGC 1769 = IC 2116. The large Dec offset compared to how well the other IDs agree makes this less likely in my opinion (and it is only that). I hope this clears up the questions from Francois Ochsenbein, though some rejiggering of SIMBAD aliases is implied!

  \Brian

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