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Date and Time of the Query: 2019-02-21 T17:18:46 PST
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Diameter data point(s) for object NGC 1421

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 POSS1 103a-O
1968MCG4..C...0000V
3.20 arcmin 0.60 arcmin ... ... ... ... ... High surface brightness 7.40E+14 192.00 ... 0.19 0.81 0.93 79 ...
2 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
1.55 log(2a) + 1 ... ... 0.61
log(a/b)
0.02 ... ... 0
[J2000]
25.0 B-mag arcsec^-2^ 6.81E+14 212.90 10.00 0.24 0.76 0.89 76 0
[J2000]
3 RC3 A_e (Johnson B)
1991RC3.9.C...0000d
1.17 log(2a) + 1 ... ... ... 0.02 ... ... ... ... 6.81E+14 88.70 4.20 ... ... ... ... ...
4 RC3 D_0 (blue)
1991RC3.9.C...0000d
1.56 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 217.80 ... ... ... ... ... ...
5 K_s (LGA/2MASS isophotal)
2003AJ....125..525J
96.5 (a) arcsec ... ... 0.220 (b/a) ... ... ... 2.5
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 193.00 ... 0.22 0.78 0.91 77 3
[J2000]
6 K_s (LGA/2MASS "total")
2003AJ....125..525J
160.1 (a) arcsec ... ... 0.220 (b/a) ... ... ... 2.5
[J2000]
Diameter for "total" magnitude 1.38E+14 320.20 ... 0.22 0.78 0.91 77 3
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1968MCG4..C...0000V
Published Object Name         : MCG -02-10-008                
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 3.20       arcmin                   2a = 192.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  0.60      arcmin              2b = 36.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.19
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.81
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.93
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 79 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          : 034006          -1338    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : MCG -02-10-008 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 1.55 2a = 212.90 arcsec Uncertainty : 0.02 10.00 arcsec Minor Axis (2b) : ... 2b = 52.16 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 0.61 b/a = 0.24 Uncertainty : 0.03 0.02 Ellipticity : ... 1 - b/a = 0.76 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.89 Uncertainty : ... ... Cos-1(b/a) : ... 76 deg Position Angle [Equinox] : 0 deg [J2000] 0 deg [J2000] Uncertainty : ... ... Significance : Mean error Diameter Reference Level : 25.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+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 : Isophotal diameter Coordinates Targeted : 034229.5 -132918. (J2000) Qualifiers : Homogenized from previously published data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : MCG -02-10-008 Frequency Targeted : RC3 A_e (Johnson B) Major Axis (2a) : log(2a) + 1 = 1.17 2a = 88.70 arcsec Uncertainty : 0.02 4.20 arcsec Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : Mean error Diameter Reference Level : ... Frequency : 4400 A 6.81E+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 : Isophotal diameter Coordinates Targeted : 034229.5 -132918. (J2000) Qualifiers : From new, raw data NED Comment : From magnitude-aperture curves.
No. 4 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : MCG -02-10-008 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 1.56 2a = 217.80 arcsec Uncertainty : ... ... Minor Axis (2b) : ... ... Uncertainty : ... ... Axis Ratio : ... ... Uncertainty : ... ... Ellipticity : ... ... Uncertainty : ... ... Eccentricity : ... ... Uncertainty : ... ... Cos-1(b/a) : ... ... Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 25.0 B-mag arcsec^-2^ Frequency : 4400 A 6.81E+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 : Isophotal diameter Coordinates Targeted : 034229.5 -132918. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.
No. 5 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 1421 Frequency Targeted : K_s (LGA/2MASS isophotal) Major Axis (2a) : a = 96.5 arcsec 2a = 193.00 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 42.46 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.220 b/a = 0.22 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.78 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.91 Uncertainty : ... ... Cos-1(b/a) : ... 77 deg Position Angle [Equinox] : 2.5 deg [J2000] 3 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 : 55.622120 -13.488170 (J2000) Qualifiers : From new, raw data NED Comment :
No. 6 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 1421 Frequency Targeted : K_s (LGA/2MASS "total") Major Axis (2a) : a = 160.1 arcsec 2a = 320.20 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 70.44 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.220 b/a = 0.22 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.78 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.91 Uncertainty : ... ... Cos-1(b/a) : ... 77 deg Position Angle [Equinox] : 2.5 deg [J2000] 3 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 : 55.622120 -13.488170 (J2000) Qualifiers : From new, raw data NED Comment :

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