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Date and Time of the Query: 2019-08-24 T19:58:09 PDT
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Diameter data point(s) for object NGC 1275

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
3.50 arcmin 2.50 arcmin ... ... ... ... 110
[B1950]
About 25.0 B-mag arcsec^-2^ 7.40E+14 210.00 ... 0.71 0.29 0.32 44 110
[J2000]
2 POSS1 103a-O
1964MCG2..C...0000V
0.60 arcmin 0.45 arcmin ... ... ... ... ... Very high surface brightness 7.40E+14 36.00 ... 0.75 0.25 0.28 41 ...
3 POSS1 103a-O
1964MCG2..C...0000V
1.20 arcmin 0.80 arcmin ... ... ... ... ... ... 7.40E+14 72.00 ... 0.67 0.33 0.38 48 ...
4 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
1.34 log(2a) + 1 ... ... 0.12
log(a/b)
0.03 ... ... 110
[J2000]
25.0 B-mag arcsec^-2^ 6.81E+14 131.30 9.40 0.76 0.24 0.27 41 110
[J2000]
5 RC3 A_e (Johnson B)
1991RC3.9.C...0000d
0.75 log(2a) + 1 ... ... ... 0.06 ... ... ... ... 6.81E+14 33.70 5.00 ... ... ... ... ...
6 RC3 D_0 (blue)
1991RC3.9.C...0000d
1.41 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 154.20 ... ... ... ... ... ...
7 K_s (LGA/2MASS isophotal)
2003AJ....125..525J
62.9 (a) arcsec ... ... 0.830 (b/a) ... ... ... -80.0
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 125.80 ... 0.83 0.17 0.18 34 100
[J2000]
8 K_s (LGA/2MASS "total")
2003AJ....125..525J
135.1 (a) arcsec ... ... 0.830 (b/a) ... ... ... -80.0
[J2000]
Diameter for "total" magnitude 1.38E+14 270.20 ... 0.83 0.17 0.18 34 100
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1973UGC...C...0000N
Published Object Name         : UGC 02669                     
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 3.50       arcmin                   2a = 210.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  2.50      arcmin              2b = 150.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.71
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.29
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.32
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 44 deg
Position Angle [Equinox]      : 110    deg [B1950]                  110 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          : 031630.         +412000.    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   : Diameters flagged uncertain.            

No. 2 Published Units: Homogenized Units: Reference Code : 1964MCG2..C...0000V Published Object Name : MCG +07-07-063 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 0.60 arcmin 2a = 36.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.45 arcmin 2b = 27.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.75 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.25 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.28 Uncertainty : ... ... Cos-1(b/a) : ... 41 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 : 031624 +4119 (B1950) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1964MCG2..C...0000V Published Object Name : MCG +07-07-063 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 1.20 arcmin 2a = 72.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.80 arcmin 2b = 48.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.67 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.33 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.38 Uncertainty : ... ... Cos-1(b/a) : ... 48 deg Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : ... 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 : 031624 +4119 (B1950) Qualifiers : From new, raw data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : UGC 02669 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 1.34 2a = 131.30 arcsec Uncertainty : 0.03 9.40 arcsec Minor Axis (2b) : ... 2b = 99.66 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 0.12 b/a = 0.76 Uncertainty : 0.04 0.07 Ellipticity : ... 1 - b/a = 0.24 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.27 Uncertainty : ... ... Cos-1(b/a) : ... 41 deg Position Angle [Equinox] : 110 deg [J2000] 110 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 : 031948.5 +413045. (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 02669 Frequency Targeted : RC3 A_e (Johnson B) Major Axis (2a) : log(2a) + 1 = 0.75 2a = 33.70 arcsec Uncertainty : 0.06 5.00 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 : 031948.5 +413045. (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 02669 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 1.41 2a = 154.20 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 : 031948.5 +413045. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.
No. 7 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 1275 Frequency Targeted : K_s (LGA/2MASS isophotal) Major Axis (2a) : a = 62.9 arcsec 2a = 125.80 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 104.41 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.830 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.18 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : -80.0 deg [J2000] 100 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 : 49.950981 41.511681 (J2000) Qualifiers : From new, raw data NED Comment :
No. 8 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : NGC 1275 Frequency Targeted : K_s (LGA/2MASS "total") Major Axis (2a) : a = 135.1 arcsec 2a = 270.20 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 224.27 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.830 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.18 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : -80.0 deg [J2000] 100 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 : 49.950981 41.511681 (J2000) Qualifiers : From new, raw data NED Comment :

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