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Date and Time of the Query: 2019-06-19 T16:03:17 PDT
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Diameter data point(s) for object IC 3940

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.......:
12.3 (a) arcsec ... ... 0.640 (b/a) ... ... ... -30
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 24.60 ... 0.64 0.36 0.42 50 150
[J2000]
2 K_s (2MASS "total")
20032MASX.C.......:
22.5 (a) arcsec ... ... 0.640 (b/a) ... ... ... -30
[J2000]
Diameter for "total" magnitude 1.38E+14 45.00 ... 0.64 0.36 0.42 50 150
[J2000]
3 r (SDSS Isophotal)
2007SDSS6.C...0000:
22.28 (a) arcsec 11.54 arcsec ... ... ... ... 139.8
[J2000]
25.0 mag arcsec^-2^ 4.77E+14 44.56 ... 0.52 0.48 0.58 59 140
[J2000]
4 r (SDSS Petrosian)
2007SDSS6.C...0000:
3.91 (a) arcsec ... ... ... 0.162 ... ... ... ... 4.77E+14 7.83 0.32 ... ... ... ... ...
5 r (SDSS deVaucouleurs)
2007SDSS6.C...0000:
2.6857 (a) arcsec ... ... 0.554 (b/a) 0.019 ... ... 137.4
[J2000]
... 4.77E+14 5.37 0.04 0.55 0.45 0.53 56 137
[J2000]
6 r (SDSS Exponential)
2007SDSS6.C...0000:
1.8276 (a) arcsec ... ... 0.535 (b/a) 0.009 ... ... 138.6
[J2000]
... 4.77E+14 3.65 0.02 0.54 0.46 0.55 58 139
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J12581646+3550195       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 12.3       arcsec               2a = 24.60 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 15.74 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.640                         b/a = 0.64
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.36
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.42
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 50 deg
Position Angle [Equinox]      :  -30   deg [J2000]                  150 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          : 194.568634      35.838802    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 20032MASX.C.......: Published Object Name : 2MASX J12581646+3550195 Frequency Targeted : K_s (2MASS "total") Major Axis (2a) : a = 22.5 arcsec 2a = 45.00 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 28.80 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.640 b/a = 0.64 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.36 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.42 Uncertainty : ... ... Cos-1(b/a) : ... 50 deg Position Angle [Equinox] : -30 deg [J2000] 150 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 : 194.568634 35.838802 (J2000) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J125816.46+355020.1 Frequency Targeted : r (SDSS Isophotal) Major Axis (2a) : a = 22.28 arcsec 2a = 44.56 arcsec Uncertainty : ... ... Minor Axis (2b) : b = 11.54 arcsec 2b = 23.08 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.52 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.48 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.58 Uncertainty : ... ... Cos-1(b/a) : ... 59 deg Position Angle [Equinox] : 139.8 deg [J2000] 140 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 25.0 mag arcsec^-2^ Frequency : 6290 A 4.77E+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 : 194.5686150137 35.8389423784 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J125816.46+355020.1 Frequency Targeted : r (SDSS Petrosian) Major Axis (2a) : a = 3.91 arcsec 2a = 7.83 arcsec Uncertainty : 0.162 arcsec 0.32 arcsec Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : Based on count statistics only Diameter Reference Level : ... Frequency : 6290 A 4.77E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Maps (e.g., 2MASS, VLA, Sloan) Fitting Technique : Profile fitting to image Measured Quantity : See comments Qualifiers : A radius is given in DIA_MAJ, not a diameter Coordinates Targeted : 194.5686150137 35.8389423784 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 5 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J125816.46+355020.1 Frequency Targeted : r (SDSS deVaucouleurs) Major Axis (2a) : a = 2.6857 arcsec 2a = 5.37 arcsec Uncertainty : 0.019 arcsec 0.04 arcsec Minor Axis (2b) : ... 2b = 2.98 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.554 b/a = 0.55 Uncertainty : 0.004 0.00 Ellipticity : ... 1 - b/a = 0.45 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.53 Uncertainty : ... ... Cos-1(b/a) : ... 56 deg Position Angle [Equinox] : 137.4 deg [J2000] 137 deg [J2000] Uncertainty : ... ... Significance : Based on count statistics only Diameter Reference Level : ... Frequency : 6290 A 4.77E+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 : Half-light ("effective") diameter Qualifiers : A radius is given in DIA_MAJ, not a diameter Coordinates Targeted : 194.5686150137 35.8389423784 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius
No. 6 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J125816.46+355020.1 Frequency Targeted : r (SDSS Exponential) Major Axis (2a) : a = 1.8276 arcsec 2a = 3.65 arcsec Uncertainty : 0.009 arcsec 0.02 arcsec Minor Axis (2b) : ... 2b = 1.96 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.535 b/a = 0.54 Uncertainty : 0.003 0.00 Ellipticity : ... 1 - b/a = 0.46 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.55 Uncertainty : ... ... Cos-1(b/a) : ... 58 deg Position Angle [Equinox] : 138.6 deg [J2000] 139 deg [J2000] Uncertainty : ... ... Significance : Based on count statistics only Diameter Reference Level : ... Frequency : 6290 A 4.77E+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 : Half-light ("effective") diameter Qualifiers : A radius is given in DIA_MAJ, not a diameter Coordinates Targeted : 194.5686150137 35.8389423784 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius

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