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Date and Time of the Query: 2019-03-21 T02:34:13 PDT
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Diameter data point(s) for object IC 1971

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
0.80 arcmin 0.40 arcmin ... ... ... ... 173
[B1950]
About 25.5 B-mag arcsec^-2^ 6.81E+14 48.00 ... 0.50 0.50 0.60 60 173
[J2000]
2 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
42.66 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 42.66 ... 0.50 0.50 0.60 60 173
[J2000]
3 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
51.88 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 51.88 ... 0.50 0.50 0.60 60 173
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
60.3 arcsec ... ... 2.000 (a/b) ... ... ... 173.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 60.30 ... 0.50 0.50 0.60 60 173
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
60.26 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 60.26 ... 0.50 0.50 0.60 60 173
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
25.70 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
70% total B light 6.81E+14 25.70 ... 0.50 0.50 0.60 60 173
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
32.36 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
80% total B light 6.81E+14 32.36 ... 0.50 0.50 0.60 60 173
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
41.21 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
90% total B light 6.81E+14 41.21 ... 0.50 0.50 0.60 60 173
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
14.45 arcsec ... ... 2.00 (a/b) ... ... ... 173.00
[B1950]
50% total B light, major dia. 6.81E+14 14.45 ... 0.50 0.50 0.60 60 173
[J2000]
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
11.48 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 11.48 ... ... ... ... ... ...
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
4.95 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 4.95 ... ... ... ... ... ...
12 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
0.15 arcsec ... ... 1.71 (a/b) ... ... ... 172.69
[B1950]
B exponential scale length 6.81E+14 0.15 ... 0.58 0.42 0.49 54 173
[J2000]
13 ESO-LV IIIa-F
1989ESOLV.C...0000L
0.04 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 0.04 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1982ESOU..C...0000L
Published Object Name         : ESO 156- G 001                
Frequency Targeted            : ESO-Uppsala "Quick Blue" IIa-O
Major Axis (2a)               : 0.80       arcmin                   2a = 48.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =   0.40     arcmin              2b = 24.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.50
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.50
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.60
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 60 deg
Position Angle [Equinox]      : 173    deg [B1950]                  173 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          : 033435.         -524854.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 42.66 arcsec 2a = 42.66 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 85.32 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 51.88 arcsec 2a = 51.88 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 103.76 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 60.3 arcsec 2a = 60.30 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 120.60 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.000 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.64583 -52.81500 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 60.26 arcsec 2a = 60.26 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 120.52 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 25.70 arcsec 2a = 25.70 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 51.40 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 32.36 arcsec 2a = 32.36 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 64.72 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 41.21 arcsec 2a = 41.21 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 82.42 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (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 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 14.45 arcsec 2a = 14.45 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 28.90 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.00 b/a = 0.50 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.50 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.60 Uncertainty : ... ... Cos-1(b/a) : ... 60 deg Position Angle [Equinox] : 173.00 deg [B1950] 173 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 : 53.645832 -52.814999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 10 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 11.48 arcsec 2a = 11.48 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 : 53.645832 -52.814999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Circular aperture
No. 11 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 4.95 arcsec 2a = 4.95 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 : 53.645832 -52.814999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 12 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 1560010 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 0.15 arcsec 2a = 0.15 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 0.26 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.71 b/a = 0.58 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.42 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.49 Uncertainty : ... ... Cos-1(b/a) : ... 54 deg Position Angle [Equinox] : 172.69 deg [B1950] 173 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 : 53.645832 -52.814999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Derived scale length < 2" mean ESO-B PSF
No. 13 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 1560010 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 0.04 arcsec 2a = 0.04 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 : 53.645832 -52.814999 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Derived scale length < 2" mean ESO-B PSF

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