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Date and Time of the Query: 2019-02-15 T21:04:48 PST
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Diameter data point(s) for object IC 1986

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
2.50 arcmin 1.80 arcmin ... ... ... ... 77
[B1950]
About 25.5 B-mag arcsec^-2^ 6.81E+14 150.00 ... 0.72 0.28 0.32 44 77
[J2000]
2 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
69.18 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 69.18 ... 0.72 0.28 0.32 44 77
[J2000]
3 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
100.00 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 100.00 ... 0.72 0.28 0.32 44 77
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
123.03 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 123.03 ... 0.72 0.28 0.32 44 77
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
68.39 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
70% total B light 6.81E+14 68.39 ... 0.72 0.28 0.32 44 77
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
85.11 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
80% total B light 6.81E+14 85.11 ... 0.72 0.28 0.32 44 77
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
110.92 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
90% total B light 6.81E+14 110.92 ... 0.72 0.28 0.32 44 77
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
43.65 arcsec ... ... 1.39 (a/b) ... ... ... 77.00
[B1950]
50% total B light, major dia. 6.81E+14 43.65 ... 0.72 0.28 0.32 44 77
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
36.73 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 36.73 ... ... ... ... ... ...
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
9.97 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 9.97 ... ... ... ... ... ...
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
7.23 arcsec ... ... 1.44 (a/b) ... ... ... 127.28
[B1950]
B exponential scale length 6.81E+14 7.23 ... 0.69 0.31 0.35 46 128
[J2000]
12 ESO-LV IIIa-F
1989ESOLV.C...0000L
10.98 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 10.98 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1982ESOU..C...0000L
Published Object Name         : ESO 249- G 013                
Frequency Targeted            : ESO-Uppsala "Quick Blue" IIa-O
Major Axis (2a)               : 2.50       arcmin                   2a = 150.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =   1.80     arcmin              2b = 108.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.72
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.28
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.32
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 44 deg
Position Angle [Equinox]      :  77    deg [B1950]                  77 deg [J2000]
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          : 033857.         -453054.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   : Diameters and PA flagged uncertain.     

No. 2 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 69.18 arcsec 2a = 69.18 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 96.08 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 100.00 arcsec 2a = 100.00 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 138.89 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 123.03 arcsec 2a = 123.03 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 170.88 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 27.0 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 68.39 arcsec 2a = 68.39 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 94.99 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 85.11 arcsec 2a = 85.11 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 118.21 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 110.92 arcsec 2a = 110.92 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 154.06 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (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 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 43.65 arcsec 2a = 43.65 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 60.62 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.39 b/a = 0.72 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.28 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.32 Uncertainty : ... ... Cos-1(b/a) : ... 44 deg Position Angle [Equinox] : 77.00 deg [B1950] 77 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 : 54.737499 -45.514999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 9 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 36.73 arcsec 2a = 36.73 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 : 54.737499 -45.514999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Circular aperture
No. 10 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 9.97 arcsec 2a = 9.97 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 : 54.737499 -45.514999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 11 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490130 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 7.23 arcsec 2a = 7.23 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 10.42 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.44 b/a = 0.69 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.31 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.35 Uncertainty : ... ... Cos-1(b/a) : ... 46 deg Position Angle [Equinox] : 127.28 deg [B1950] 128 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 : 54.737499 -45.514999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 12 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490130 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 10.98 arcsec 2a = 10.98 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 : 54.737499 -45.514999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants

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