NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-05-20 T00:02:53 PDT
Help | Comment | NED Home

Diameter data point(s) for object NGC 4656

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
22.00 arcmin 3.00 arcmin ... ... ... ... 33
[B1950]
About 25.0 B-mag arcsec^-2^ 7.40E+14 1320.00 ... 0.14 0.86 0.96 82 33
[J2000]
2 POSS1 103a-O
1964MCG2..C...0000V
4.50 arcmin 1.00 arcmin ... ... ... ... ... Very high surface brightness 7.40E+14 270.00 ... 0.22 0.78 0.91 77 ...
3 POSS1 103a-O
1964MCG2..C...0000V
20.00 arcmin 2.50 arcmin ... ... ... ... ... Moderate surface brightness 7.40E+14 1200.00 ... 0.12 0.88 0.97 83 ...
4 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
2.18 log(2a) + 1 ... ... 0.71
log(a/b)
0.01 ... ... 33
[J2000]
25.0 B-mag arcsec^-2^ 6.81E+14 908.10 21.20 0.20 0.80 0.93 79 33
[J2000]
5 RC3 A_e (Johnson B)
1991RC3.9.C...0000d
1.51 log(2a) + 1 ... ... ... 0.04 ... ... ... ... 6.81E+14 194.20 18.70 ... ... ... ... ...
6 RC3 D_0 (blue)
1991RC3.9.C...0000d
2.18 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 908.10 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1973UGC...C...0000N
Published Object Name         : UGC 07907                     
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 22.00      arcmin                   2a = 1320.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  3.00      arcmin              2b = 180.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.14
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.86
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.96
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 82 deg
Position Angle [Equinox]      :  33    deg [B1950]                  33 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          : 124136.         +322700.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 1964MCG2..C...0000V Published Object Name : MCG +05-30-066 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 4.50 arcmin 2a = 270.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 1.00 arcmin 2b = 60.00 arcsec Uncertainty : ... ... Axis Ratio : ... 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] : ... ... 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 : 124130 +3226 (B1950) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1964MCG2..C...0000V Published Object Name : MCG +05-30-066 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 20.00 arcmin 2a = 1200.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 2.50 arcmin 2b = 150.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.12 Uncertainty : ... ... 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] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : Moderate 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 : 124130 +3226 (B1950) Qualifiers : Uncertain origin NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : UGC 07907 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 2.18 2a = 908.10 arcsec Uncertainty : 0.01 21.20 arcsec Minor Axis (2b) : ... 2b = 177.08 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 0.71 b/a = 0.20 Uncertainty : 0.02 0.01 Ellipticity : ... 1 - b/a = 0.80 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.93 Uncertainty : ... ... Cos-1(b/a) : ... 79 deg Position Angle [Equinox] : 33 deg [J2000] 33 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 : 124358.0 +321018. (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 07907 Frequency Targeted : RC3 A_e (Johnson B) Major Axis (2a) : log(2a) + 1 = 1.51 2a = 194.20 arcsec Uncertainty : 0.04 18.70 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 : 124358.0 +321018. (J2000) Qualifiers : From new, raw data NED Comment : From magnitude-aperture curves.
No. 6 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : UGC 07907 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 2.18 2a = 908.10 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 : 124358.0 +321018. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.

Back to NED Home