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Date and Time of the Query: 2019-06-16 T06:09:58 PDT
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Diameter data point(s) for object SDSS J164935.90+642711.5

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 r (SDSS Isophotal)
2007SDSS6.C...0000:
2.94 (a) arcsec 2.20 arcsec ... ... ... ... 58.7
[J2000]
25.0 mag arcsec^-2^ 4.77E+14 5.88 ... 0.75 0.25 0.28 42 59
[J2000]
2 r (SDSS Petrosian)
2007SDSS6.C...0000:
0.75 (a) arcsec ... ... ... 0.029 ... ... ... ... 4.77E+14 1.49 0.06 ... ... ... ... ...
3 r (SDSS deVaucouleurs)
2007SDSS6.C...0000:
0.2017 (a) arcsec ... ... 0.344 (b/a) 0.025 ... ... 62.8
[J2000]
... 4.77E+14 0.40 0.05 0.34 0.66 0.79 70 63
[J2000]
4 r (SDSS Exponential)
2007SDSS6.C...0000:
0.2390 (a) arcsec ... ... 0.405 (b/a) 0.014 ... ... 61.5
[J2000]
... 4.77E+14 0.48 0.03 0.41 0.59 0.72 66 62
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 2007SDSS6.C...0000:
Published Object Name         : SDSS J164935.90+642711.5      
Frequency Targeted            : r (SDSS Isophotal)            
Major Axis (2a)               : a = 2.94       arcsec               2a = 5.88 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : b =       2.20 arcsec               2b = 4.40 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.75
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.25
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.28
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 42 deg
Position Angle [Equinox]      :   58.7 deg [J2000]                  59 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          : 252.3996130717  64.4532195922    (J2000)
Qualifiers                    : From new, raw data; DIA_MAJ or DIA_MIN modified from
                               published data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J164935.90+642711.5 Frequency Targeted : r (SDSS Petrosian) Major Axis (2a) : a = 0.75 arcsec 2a = 1.49 arcsec Uncertainty : 0.029 arcsec 0.06 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 : 252.3996130717 64.4532195922 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J164935.90+642711.5 Frequency Targeted : r (SDSS deVaucouleurs) Major Axis (2a) : a = 0.2017 arcsec 2a = 0.40 arcsec Uncertainty : 0.025 arcsec 0.05 arcsec Minor Axis (2b) : ... 2b = 0.14 arcsec Uncertainty : ... 0.01 Axis Ratio : b/a = 0.344 b/a = 0.34 Uncertainty : 0.107 0.11 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] : 62.8 deg [J2000] 63 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 : 252.3996130717 64.4532195922 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius
No. 4 Published Units: Homogenized Units: Reference Code : 2007SDSS6.C...0000: Published Object Name : SDSS J164935.90+642711.5 Frequency Targeted : r (SDSS Exponential) Major Axis (2a) : a = 0.2390 arcsec 2a = 0.48 arcsec Uncertainty : 0.014 arcsec 0.03 arcsec Minor Axis (2b) : ... 2b = 0.19 arcsec Uncertainty : ... 0.00 Axis Ratio : b/a = 0.405 b/a = 0.41 Uncertainty : 0.087 0.09 Ellipticity : ... 1 - b/a = 0.59 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.72 Uncertainty : ... ... Cos-1(b/a) : ... 66 deg Position Angle [Equinox] : 61.5 deg [J2000] 62 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 : 252.3996130717 64.4532195922 (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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