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NASA/IPAC EXTRAGALACTIC DATABASE Date and Time of the Query: 2019-04-21 T05:29:37 PDT Help | Comment | NED Home

Diameter data point(s) for object NGC 0284

Diameter Data --- Published and Homogenized (arcsec) Units

	Published Units										Homogenized Units
No.	Observed Passband REFCODE	Major Axis (2a)	Major Axis Units	Minor Axis (2b)	Minor Axis Units	Axis Ratio (b/a)	Major Axis Unc.	Ellipticity (1 - b/a)	Eccentricity [(a/b)²-1]/ [(a/b)²+1]	Position Angle (deg) [published]	Reference Level	Frequency (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.......:	15.2 (a)	arcsec	...	...	0.680 (b/a)	...	...	...	20 [J2000]	20.0 K-mag arcsec^-2^	1.38E+14	30.40	...	0.68	0.32	0.37	47	20 [J2000]
2	K_s (2MASS "total") 20032MASX.C.......:	27.3 (a)	arcsec	...	...	0.680 (b/a)	...	...	...	20 [J2000]	Diameter for "total" magnitude	1.38E+14	54.70	...	0.68	0.32	0.37	47	20 [J2000]
3	POSS1 103a-O 1968MCG4..C...0000V	0.20	arcmin	0.20	arcmin	...	...	...	...	...	Very high surface brightness	7.40E+14	12.00	...	1.00	0.00	0.00	0	...

Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J00532423-1309321       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 15.2       arcsec               2a = 30.40 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 20.67 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.680                         b/a = 0.68
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.32
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)²-1]/[(a/b)²+1] = 0.37
Uncertainty                   : ...                                 ...
Cos^-1(b/a)                    : ...                                 47 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          : 13.351004       -13.158920    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

 No. 2
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J00532423-1309321       
Frequency Targeted            : K_s (2MASS "total")           
Major Axis (2a)               : a = 27.3       arcsec               2a = 54.70 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 37.20 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.680                         b/a = 0.68
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.32
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)²-1]/[(a/b)²+1] = 0.37
Uncertainty                   : ...                                 ...
Cos^-1(b/a)                    : ...                                 47 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          : 13.351004       -13.158920    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

 No. 3
                                Published Units:                    Homogenized Units:

Reference Code                : 1968MCG4..C...0000V
Published Object Name         : MCG -02-03-032                
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 0.20       arcmin                   2a = 12.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  0.20      arcmin              2b = 12.00 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      : Very 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          : 005054          -1325    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :

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