NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-16 T14:06:13 PDT
Help | Comment | NED Home

Diameter data point(s) for object SDSS J164940.22+642959.9

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:
1.35 (a) arcsec 0.78 arcsec ... ... ... ... 45.5
[J2000]
25.0 mag arcsec^-2^ 4.77E+14 2.71 ... 0.57 0.43 0.50 55 46
[J2000]
2 r (SDSS Petrosian)
2007SDSS6.C...0000:
0.45 (a) arcsec ... ... ... 0.049 ... ... ... ... 4.77E+14 0.90 0.10 ... ... ... ... ...
3 r (SDSS deVaucouleurs)
2007SDSS6.C...0000:
0.0309 (a) arcsec ... ... 0.125 (b/a) 0.311 ... ... 47.6
[J2000]
... 4.77E+14 0.06 0.62 0.12 0.88 0.97 83 48
[J2000]
4 r (SDSS Exponential)
2007SDSS6.C...0000:
0.0623 (a) arcsec ... ... 0.256 (b/a) 0.168 ... ... 43.8
[J2000]
... 4.77E+14 0.12 0.34 0.26 0.74 0.88 75 44
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 2007SDSS6.C...0000:
Published Object Name         : SDSS J164940.22+642959.9      
Frequency Targeted            : r (SDSS Isophotal)            
Major Axis (2a)               : a = 1.35       arcsec               2a = 2.71 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : b =       0.78 arcsec               2b = 1.57 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.57
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.43
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.50
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 55 deg
Position Angle [Equinox]      :   45.5 deg [J2000]                  46 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          : 252.4176220480  64.4999756672    (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 J164940.22+642959.9 Frequency Targeted : r (SDSS Petrosian) Major Axis (2a) : a = 0.45 arcsec 2a = 0.90 arcsec Uncertainty : 0.049 arcsec 0.10 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 : 252.4176220480 64.4999756672 (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 J164940.22+642959.9 Frequency Targeted : r (SDSS deVaucouleurs) Major Axis (2a) : a = 0.0309 arcsec 2a = 0.06 arcsec Uncertainty : 0.311 arcsec 0.62 arcsec Minor Axis (2b) : ... 2b = 0.01 arcsec Uncertainty : ... 38.86 Axis Ratio : b/a = 0.125 b/a = 0.12 Uncertainty : 62.579 62.58 Ellipticity : ... 1 - b/a = 0.88 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.97 Uncertainty : ... ... Cos-1(b/a) : ... 83 deg Position Angle [Equinox] : 47.6 deg [J2000] 48 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 : 252.4176220480 64.4999756672 (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 J164940.22+642959.9 Frequency Targeted : r (SDSS Exponential) Major Axis (2a) : a = 0.0623 arcsec 2a = 0.12 arcsec Uncertainty : 0.168 arcsec 0.34 arcsec Minor Axis (2b) : ... 2b = 0.03 arcsec Uncertainty : ... 62.40 Axis Ratio : b/a = 0.256 b/a = 0.26 Uncertainty : 185.729 185.73 Ellipticity : ... 1 - b/a = 0.74 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.88 Uncertainty : ... ... Cos-1(b/a) : ... 75 deg Position Angle [Equinox] : 43.8 deg [J2000] 44 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 : 252.4176220480 64.4999756672 (J2000) Qualifiers : From new, raw data; DIA_MAJ or DIA_MIN modified from published data NED Comment : Effective (half-light) radius

Back to NED Home