NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2018-12-11 T14:51:18 PST
Help | Comment | NED Home

Diameter data point(s) for object NGC 2748

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
1973UGC...C...0000N
3.10 arcmin 1.20 arcmin ... ... ... ... 38
[B1950]
About 25.0 B-mag arcsec^-2^ 7.40E+14 186.00 ... 0.39 0.61 0.74 67 39
[J2000]
2 POSS1 103a-O
1962MCG1..C...0000V
2.20 arcmin 0.65 arcmin ... ... ... ... ... Very high surface brightness 7.40E+14 132.00 ... 0.29 0.71 0.84 73 ...
3 POSS1 103a-O
1962MCG1..C...0000V
3.20 arcmin 0.95 arcmin ... ... ... ... ... Intermed. surface brightness 7.40E+14 192.00 ... 0.30 0.70 0.84 73 ...
4 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
1.48 log(2a) + 1 ... ... 0.42
log(a/b)
0.03 ... ... 38
[J2000]
25.0 B-mag arcsec^-2^ 6.81E+14 181.20 13.00 0.38 0.62 0.75 68 39
[J2000]
5 RC3 D_0 (blue)
1991RC3.9.C...0000d
1.48 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 181.20 ... ... ... ... ... ...
6 K_s (LGA/2MASS isophotal)
2003AJ....125..525J
57.7 (a) arcsec ... ... 0.330 (b/a) ... ... ... 40.5
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 115.40 ... 0.33 0.67 0.80 71 41
[J2000]
7 K_s (LGA/2MASS "total")
2003AJ....125..525J
111.6 (a) arcsec ... ... 0.330 (b/a) ... ... ... 40.5
[J2000]
Diameter for "total" magnitude 1.38E+14 223.20 ... 0.33 0.67 0.80 71 41
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1973UGC...C...0000N
Published Object Name         : UGC 04825                     
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 3.10       arcmin                   2a = 186.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  1.20      arcmin              2b = 72.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.39
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.61
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.74
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 67 deg
Position Angle [Equinox]      :  38    deg [B1950]                  39 deg [J2000]
Uncertainty                   : ...                                 ...
Significance                  : No uncertainty reported
Diameter Reference Level      : About 25.0 B-mag arcsec^-2^   
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          : 090800.         +764100.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 1962MCG1..C...0000V Published Object Name : MCG +13-07-019 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 2.20 arcmin 2a = 132.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.65 arcmin 2b = 39.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.29 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.71 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.84 Uncertainty : ... ... Cos-1(b/a) : ... 73 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 : "Inner" diameter Coordinates Targeted : 090900 +7641 (B1950) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1962MCG1..C...0000V Published Object Name : MCG +13-07-019 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 3.20 arcmin 2a = 192.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.95 arcmin 2b = 57.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.30 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.70 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.84 Uncertainty : ... ... Cos-1(b/a) : ... 73 deg Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : Intermed. 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 : 090900 +7641 (B1950) Qualifiers : From new, raw data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : UGC 04825 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 1.48 2a = 181.20 arcsec Uncertainty : 0.03 13.00 arcsec Minor Axis (2b) : ... 2b = 68.86 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 0.42 b/a = 0.38 Uncertainty : 0.03 0.03 Ellipticity : ... 1 - b/a = 0.62 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.75 Uncertainty : ... ... Cos-1(b/a) : ... 68 deg Position Angle [Equinox] : 38 deg [J2000] 39 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 : 091344.7 +762832. (J2000) Qualifiers : Homogenized from previously published data NED Comment :
No. 5 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : UGC 04825 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 1.48 2a = 181.20 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 : 091344.7 +762832. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.
No. 6 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 2748 Frequency Targeted : K_s (LGA/2MASS isophotal) Major Axis (2a) : a = 57.7 arcsec 2a = 115.40 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 38.08 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.330 b/a = 0.33 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.67 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.80 Uncertainty : ... ... Cos-1(b/a) : ... 71 deg Position Angle [Equinox] : 40.5 deg [J2000] 41 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 : 138.429962 76.475304 (J2000) Qualifiers : From new, raw data NED Comment :
No. 7 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 2748 Frequency Targeted : K_s (LGA/2MASS "total") Major Axis (2a) : a = 111.6 arcsec 2a = 223.20 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 73.66 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.330 b/a = 0.33 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.67 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.80 Uncertainty : ... ... Cos-1(b/a) : ... 71 deg Position Angle [Equinox] : 40.5 deg [J2000] 41 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 : 138.429962 76.475304 (J2000) Qualifiers : From new, raw data NED Comment :

Back to NED Home