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Date and Time of the Query: 2019-03-25 T19:47:25 PDT
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Diameter data point(s) for object IC 1646

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.......:
15.0 (a) arcsec ... ... 0.460 (b/a) ... ... ... 20
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 30.00 ... 0.46 0.54 0.65 63 20
[J2000]
2 K_s (2MASS "total")
20032MASX.C.......:
26.4 (a) arcsec ... ... 0.460 (b/a) ... ... ... 20
[J2000]
Diameter for "total" magnitude 1.38E+14 52.70 ... 0.46 0.54 0.65 63 20
[J2000]
3 POSS1 103a-O
1963MCG3..C...0000V
0.50 arcmin 0.50 arcmin ... ... ... ... ... High surface brightness 7.40E+14 30.00 ... 1.00 0.00 0.00 0 ...
4 r (SDSS Isophotal)
2004SDSS2.C...0000:
19.98 (a) arcsec 17.68 arcsec ... ... ... ... 125.5
[J2000]
25.0 mag arcsec^-2^ 4.77E+14 39.95 ... 0.89 0.11 0.12 28 126
[J2000]
5 r (SDSS Petrosian)
2004SDSS2.C...0000:
6.63 (a) arcsec ... ... ... 0.11 ... ... ... ... 4.77E+14 13.25 0.21 ... ... ... ... ...
6 r (SDSS de Vaucouleurs)
2004SDSS2.C...0000:
8.10 (a) arcsec ... ... 0.854 (b/a) 0.09 ... ... 27.9
[J2000]
... 4.77E+14 16.20 0.17 0.85 0.15 0.16 31 28
[J2000]
7 r (SDSS Exponential)
2004SDSS2.C...0000:
3.36 (a) arcsec ... ... 0.827 (b/a) 0.02 ... ... 16.0
[J2000]
... 4.77E+14 6.72 0.04 0.83 0.17 0.19 34 16
[J2000]
8 r (SDSS Isophotal)
2007SDSS6.C...0000:
19.98 (a) arcsec 17.68 arcsec ... ... ... ... 125.5
[J2000]
25.0 mag arcsec^-2^ 4.77E+14 39.95 ... 0.89 0.11 0.12 28 126
[J2000]
9 r (SDSS Petrosian)
2007SDSS6.C...0000:
6.63 (a) arcsec ... ... ... 0.105 ... ... ... ... 4.77E+14 13.25 0.21 ... ... ... ... ...
10 r (SDSS deVaucouleurs)
2007SDSS6.C...0000:
8.1003 (a) arcsec ... ... 0.854 (b/a) 0.086 ... ... 27.9
[J2000]
... 4.77E+14 16.20 0.17 0.85 0.15 0.16 31 28
[J2000]
11 r (SDSS Exponential)
2007SDSS6.C...0000:
3.3606 (a) arcsec ... ... 0.827 (b/a) 0.019 ... ... 16.0
[J2000]
... 4.77E+14 6.72 0.04 0.83 0.17 0.19 34 16
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J01124382+1542281       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 15.0       arcsec               2a = 30.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 13.80 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.460                         b/a = 0.46
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.54
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.65
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 63 deg
Position Angle [Equinox]      :   20   deg [J2000]                  20 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          : 18.182621       15.707811    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 20032MASX.C.......: Published Object Name : 2MASX J01124382+1542281 Frequency Targeted : K_s (2MASS "total") Major Axis (2a) : a = 26.4 arcsec 2a = 52.70 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 24.24 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.460 b/a = 0.46 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.54 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.65 Uncertainty : ... ... Cos-1(b/a) : ... 63 deg Position Angle [Equinox] : 20 deg [J2000] 20 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 : 18.182621 15.707811 (J2000) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1963MCG3..C...0000V Published Object Name : MCG +02-04-009 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 0.50 arcmin 2a = 30.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.50 arcmin 2b = 30.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 1.00 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.00 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.00 Uncertainty : ... ... Cos-1(b/a) : ... 0 deg Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : High surface brightness Frequency : 4050 A 7.40E+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 : 011000 +1525 (B1950) Qualifiers : From new, raw data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 2004SDSS2.C...0000: Published Object Name : SDSS J011243.83+154228.1 Frequency Targeted : r (SDSS Isophotal) Major Axis (2a) : a = 19.98 arcsec 2a = 39.95 arcsec Uncertainty : ... ... Minor Axis (2b) : b = 17.68 arcsec 2b = 35.35 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.89 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.11 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.12 Uncertainty : ... ... Cos-1(b/a) : ... 28 deg Position Angle [Equinox] : 125.5 deg [J2000] 126 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 : 18.1826134 15.7078180 (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 : 2004SDSS2.C...0000: Published Object Name : SDSS J011243.83+154228.1 Frequency Targeted : r (SDSS Petrosian) Major Axis (2a) : a = 6.63 arcsec 2a = 13.25 arcsec Uncertainty : 0.11 arcsec 0.21 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 : 18.1826134 15.7078180 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 6 Published Units: Homogenized Units: Reference Code : 2004SDSS2.C...0000: Published Object Name : SDSS J011243.83+154228.1 Frequency Targeted : r (SDSS de Vaucouleurs) Major Axis (2a) : a = 8.10 arcsec 2a = 16.20 arcsec Uncertainty : 0.09 arcsec 0.17 arcsec Minor Axis (2b) : ... 2b = 13.83 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.854 b/a = 0.85 Uncertainty : 0.009 0.01 Ellipticity : ... 1 - b/a = 0.15 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.16 Uncertainty : ... ... Cos-1(b/a) : ... 31 deg Position Angle [Equinox] : 27.9 deg [J2000] 28 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 : 18.1826134 15.7078180 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius
No. 7 Published Units: Homogenized Units: Reference Code : 2004SDSS2.C...0000: Published Object Name : SDSS J011243.83+154228.1 Frequency Targeted : r (SDSS Exponential) Major Axis (2a) : a = 3.36 arcsec 2a = 6.72 arcsec Uncertainty : 0.02 arcsec 0.04 arcsec Minor Axis (2b) : ... 2b = 5.56 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.827 b/a = 0.83 Uncertainty : 0.007 0.01 Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 16.0 deg [J2000] 16 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 : 18.1826134 15.7078180 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius
No. 8 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J011243.82+154228.1 Frequency Targeted : r (SDSS Isophotal) Major Axis (2a) : a = 19.98 arcsec 2a = 39.95 arcsec Uncertainty : ... ... Minor Axis (2b) : b = 17.68 arcsec 2b = 35.35 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.89 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.11 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.12 Uncertainty : ... ... Cos-1(b/a) : ... 28 deg Position Angle [Equinox] : 125.5 deg [J2000] 126 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 : 18.1826140872 15.7078178825 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 9 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J011243.82+154228.1 Frequency Targeted : r (SDSS Petrosian) Major Axis (2a) : a = 6.63 arcsec 2a = 13.25 arcsec Uncertainty : 0.105 arcsec 0.21 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 : 18.1826140872 15.7078178825 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 10 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J011243.82+154228.1 Frequency Targeted : r (SDSS deVaucouleurs) Major Axis (2a) : a = 8.1003 arcsec 2a = 16.20 arcsec Uncertainty : 0.086 arcsec 0.17 arcsec Minor Axis (2b) : ... 2b = 13.84 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.854 b/a = 0.85 Uncertainty : 0.009 0.01 Ellipticity : ... 1 - b/a = 0.15 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.16 Uncertainty : ... ... Cos-1(b/a) : ... 31 deg Position Angle [Equinox] : 27.9 deg [J2000] 28 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 : 18.1826140872 15.7078178825 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius
No. 11 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J011243.82+154228.1 Frequency Targeted : r (SDSS Exponential) Major Axis (2a) : a = 3.3606 arcsec 2a = 6.72 arcsec Uncertainty : 0.019 arcsec 0.04 arcsec Minor Axis (2b) : ... 2b = 5.56 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.827 b/a = 0.83 Uncertainty : 0.007 0.01 Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 16.0 deg [J2000] 16 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 : 18.1826140872 15.7078178825 (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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