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Date and Time of the Query: 2022-01-25 T15:42:05 PST
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Diameter data point(s) for object NGC 6438A

Diameter Data --- Published and Homogenized (arcsec) Units

  Published UnitsHomogenized Units
No.Observed Passband
REFCODE
Major Axis
(2a)
Major Axis UnitsMinor Axis
(2b)
Minor Axis UnitsAxis Ratio (b/a)Major Axis Unc.Ellipticity
(1 - b/a)
Eccentricity
[(a/b)2-1]/
[(a/b)2+1]
Position Angle
(deg)
[published]
Reference LevelFrequency (Hz)Major Axis
(2a)
(arcsec)
Major Axis Unc.Axis Ratio (b/a)Ellipticity
(1 - b/a)
Eccentricity
[(a/b)2-1]/
[(a/b)2+1]
cos-1(b/a)
(deg)
Position Angle
(deg)
[J2000]
1 ESO-Uppsala "Quick Blue" IIa-O
1982ESOU..C...0000L
3.20 arcmin 1.40 arcmin ... ... ... ... ... About 25.5 B-mag arcsec^-2^ 6.81E+14 192.00 ... 0.44 0.56 0.68 64 ...
2 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
211.35 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 211.35 ... 0.39 0.61 0.74 67 44
[J2000]
3 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
281.84 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 281.84 ... 0.39 0.61 0.74 67 44
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
141.25 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
70% total B light 6.81E+14 141.25 ... 0.39 0.61 0.74 67 44
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
171.79 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
80% total B light 6.81E+14 171.79 ... 0.39 0.61 0.74 67 44
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
234.42 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
90% total B light 6.81E+14 234.42 ... 0.39 0.61 0.74 67 44
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
101.16 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
50% total B light, major dia. 6.81E+14 101.16 ... 0.39 0.61 0.74 67 44
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
66.83 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 66.83 ... ... ... ... ... ...
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
31.17 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 31.17 ... ... ... ... ... ...
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
4.95 arcsec ... ... 2.56 (a/b) ... ... ... 47.52
[B1950]
B exponential scale length 6.81E+14 4.95 ... 0.39 0.61 0.74 67 44
[J2000]
11 ESO-LV IIIa-F
1989ESOLV.C...0000L
0.25 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 0.25 ... ... ... ... ... ...
12 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
1.43 log(2a) + 1 ... ... 0.41
log(a/b)
0.04 ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 161.50 15.60 0.39 0.61 0.74 67 ...
13 RC3 D_0 (blue)
1991RC3.9.C...0000d
1.46 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 173.00 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1982ESOU..C...0000L
Published Object Name         : ESO 010-IG 002                
Frequency Targeted            : ESO-Uppsala "Quick Blue" IIa-O
Major Axis (2a)               : 3.20       arcmin                   2a = 192.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =   1.40     arcmin              2b = 84.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.44
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.56
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.68
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 64 deg
Position Angle [Equinox]      : ...                                 ...
Uncertainty                   : ...                                 ...
Significance                  : No uncertainty reported
Diameter Reference Level      : About 25.5 B-mag arcsec^-2^   
Frequency                     : 4400         A                      6.81E+14 Hz
Frequency Mode                : Broad-band detector (e.g. photographic plate)

Measurement Mode               
    Detector Type             : Photographic plate, print, or film
    Fitting Technique         : Eye estimate
    Measured Quantity         : "Outer" diameter
Coordinates Targeted          : 180618.         -852518.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   : Diameters flagged uncertain.            

No. 2 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 211.35 arcsec 2a = 211.35 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 541.92 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 25.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 3 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 281.84 arcsec 2a = 281.84 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 722.67 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 26.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 4 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 141.25 arcsec 2a = 141.25 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 362.18 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 70% total B light Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 5 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 171.79 arcsec 2a = 171.79 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 440.49 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 80% total B light Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 6 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 234.42 arcsec 2a = 234.42 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 601.08 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 90% total B light Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 7 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 101.16 arcsec 2a = 101.16 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 259.38 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 50% total B light, major dia. Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Half-light ("effective") diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 8 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 66.83 arcsec 2a = 66.83 arcsec Uncertainty : ... ... Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 50% total B light, aperture Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Half-light ("effective") diameter Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Circular aperture
No. 9 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 31.17 arcsec 2a = 31.17 arcsec Uncertainty : ... ... Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : B disk exp. scale length Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 10 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 4.95 arcsec 2a = 4.95 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 12.69 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.56 b/a = 0.39 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : 47.52 deg [B1950] 44 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : B exponential scale length Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 11 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 0100020 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 0.25 arcsec 2a = 0.25 arcsec Uncertainty : ... ... Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : R exponential scale length Frequency : 6400 A 4.68E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 271.575012 -85.421669 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Derived scale length < 2" mean ESO-B PSF
No. 12 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : ESO 010-IG 002 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 1.43 2a = 161.50 arcsec Uncertainty : 0.04 15.60 arcsec Minor Axis (2b) : ... 2b = 62.82 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 0.41 b/a = 0.39 Uncertainty : 0.05 0.05 Ellipticity : ... 1 - b/a = 0.61 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.74 Uncertainty : ... ... Cos-1(b/a) : ... 67 deg Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : Mean error Diameter Reference Level : 25.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Eye estimate Measured Quantity : Isophotal diameter Coordinates Targeted : 182243.2 -852415. (J2000) Qualifiers : Homogenized from previously published data NED Comment :
No. 13 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : ESO 010-IG 002 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 1.46 2a = 173.00 arcsec Uncertainty : ... ... Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 25.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Eye estimate Measured Quantity : Isophotal diameter Coordinates Targeted : 182243.2 -852415. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.

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