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Date and Time of the Query: 2019-06-18 T13:23:30 PDT
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Diameter data point(s) for object IC 1984

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 K_s (2MASS isophotal)
20032MASX.C.......:
14.2 (a) arcsec ... ... 0.340 (b/a) ... ... ... -35
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 28.40 ... 0.34 0.66 0.79 70 145
[J2000]
2 K_s (2MASS "total")
20032MASX.C.......:
24.9 (a) arcsec ... ... 0.340 (b/a) ... ... ... -35
[J2000]
Diameter for "total" magnitude 1.38E+14 49.90 ... 0.34 0.66 0.79 70 145
[J2000]
3 ESO-Uppsala "Quick Blue" IIa-O
1982ESOU..C...0000L
0.80 arcmin 0.20 arcmin ... ... ... ... 140
[B1950]
About 25.5 B-mag arcsec^-2^ 6.81E+14 48.00 ... 0.25 0.75 0.88 76 140
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
44.67 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 44.67 ... 0.25 0.75 0.88 76 140
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
51.88 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 51.88 ... 0.25 0.75 0.88 76 140
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
56.89 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 56.89 ... 0.25 0.75 0.88 76 140
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
26.92 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
70% total B light 6.81E+14 26.92 ... 0.25 0.75 0.88 76 140
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
31.62 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
80% total B light 6.81E+14 31.62 ... 0.25 0.75 0.88 76 140
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
38.46 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
90% total B light 6.81E+14 38.46 ... 0.25 0.75 0.88 76 140
[J2000]
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
20.18 arcsec ... ... 4.00 (a/b) ... ... ... 140.00
[B1950]
50% total B light, major dia. 6.81E+14 20.18 ... 0.25 0.75 0.88 76 140
[J2000]
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
11.61 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 11.61 ... ... ... ... ... ...
12 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
5.83 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 5.83 ... ... ... ... ... ...
13 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
10.82 arcsec ... ... 3.09 (a/b) ... ... ... 139.74
[B1950]
B exponential scale length 6.81E+14 10.82 ... 0.32 0.68 0.81 71 140
[J2000]
14 ESO-LV IIIa-F
1989ESOLV.C...0000L
7.57 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 7.57 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J03395025-4704327       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 14.2       arcsec               2a = 28.40 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 9.66 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.340                         b/a = 0.34
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.66
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.79
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 70 deg
Position Angle [Equinox]      :  -35   deg [J2000]                  145 deg [J2000]
Uncertainty                   : ...                                 ...
Significance                  : No uncertainty reported
Diameter Reference Level      : 20.0 K-mag arcsec^-2^         
Frequency                     : 2.17         microns                1.38E+14 Hz
Frequency Mode                : Broad-band detector (e.g. photographic plate)

Measurement Mode               
    Detector Type             : Maps (e.g., 2MASS, VLA, Sloan)
    Fitting Technique         : Ellipse fitting to image
    Measured Quantity         : Isophotal diameter
    Qualifiers                : A radius is given in DIA_MAJ, not a diameter
Coordinates Targeted          : 54.959305       -47.075821    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 20032MASX.C.......: Published Object Name : 2MASX J03395025-4704327 Frequency Targeted : K_s (2MASS "total") Major Axis (2a) : a = 24.9 arcsec 2a = 49.90 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 16.97 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.340 b/a = 0.34 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.66 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.79 Uncertainty : ... ... Cos-1(b/a) : ... 70 deg Position Angle [Equinox] : -35 deg [J2000] 145 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : Diameter for "total" magnitude Frequency : 2.17 microns 1.38E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Maps (e.g., 2MASS, VLA, Sloan) Fitting Technique : Ellipse fitting to image Measured Quantity : Isophotal diameter Qualifiers : A radius is given in DIA_MAJ, not a diameter Coordinates Targeted : 54.959305 -47.075821 (J2000) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1982ESOU..C...0000L Published Object Name : ESO 249- G 012 Frequency Targeted : ESO-Uppsala "Quick Blue" IIa-O Major Axis (2a) : 0.80 arcmin 2a = 48.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.20 arcmin 2b = 12.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140 deg [B1950] 140 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 : 033815. -471406. (B1950) Qualifiers : From new, raw data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 44.67 arcsec 2a = 44.67 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 178.68 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 51.88 arcsec 2a = 51.88 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 207.52 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 56.89 arcsec 2a = 56.89 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 227.56 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 26.92 arcsec 2a = 26.92 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 107.68 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 31.62 arcsec 2a = 31.62 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 126.48 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 38.46 arcsec 2a = 38.46 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 153.84 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 20.18 arcsec 2a = 20.18 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 80.72 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.00 b/a = 0.25 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.75 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 140.00 deg [B1950] 140 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 : 54.562500 -47.235001 (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 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 11.61 arcsec 2a = 11.61 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 : 54.562500 -47.235001 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Circular aperture
No. 12 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 5.83 arcsec 2a = 5.83 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 : 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 : 54.562500 -47.235001 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 13 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490120 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 10.82 arcsec 2a = 10.82 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 33.40 arcsec Uncertainty : ... ... Axis Ratio : a/b = 3.09 b/a = 0.32 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.68 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.81 Uncertainty : ... ... Cos-1(b/a) : ... 71 deg Position Angle [Equinox] : 139.74 deg [B1950] 140 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 : 54.562500 -47.235001 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 14 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2490120 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 7.57 arcsec 2a = 7.57 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 : 54.562500 -47.235001 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants

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