NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-04-23 T17:24:50 PDT
Help | Comment | NED Home

Diameter data point(s) for object NGC 7807

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 K_s (2MASS isophotal)
20032MASX.C.......:
13.9 (a) arcsec ... ... 0.740 (b/a) ... ... ... 65
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 27.80 ... 0.74 0.26 0.29 42 65
[J2000]
2 K_s (2MASS "total")
20032MASX.C.......:
24.5 (a) arcsec ... ... 0.740 (b/a) ... ... ... 65
[J2000]
Diameter for "total" magnitude 1.38E+14 48.90 ... 0.74 0.26 0.29 42 65
[J2000]
3 ESO-Uppsala "Quick Blue" IIa-O
1982ESOU..C...0000L
1.10 arcmin 0.90 arcmin ... ... ... ... ... About 25.5 B-mag arcsec^-2^ 6.81E+14 66.00 ... 0.82 0.18 0.20 35 ...
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
37.58 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 37.58 ... 0.83 0.17 0.19 34 76
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
44.16 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 44.16 ... 0.83 0.17 0.19 34 76
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
50.70 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 50.70 ... 0.83 0.17 0.19 34 76
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
23.44 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
70% total B light 6.81E+14 23.44 ... 0.83 0.17 0.19 34 76
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
27.86 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
80% total B light 6.81E+14 27.86 ... 0.83 0.17 0.19 34 76
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
34.67 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
90% total B light 6.81E+14 34.67 ... 0.83 0.17 0.19 34 76
[J2000]
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
17.38 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
50% total B light, major dia. 6.81E+14 17.38 ... 0.83 0.17 0.19 34 76
[J2000]
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
15.85 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 15.85 ... ... ... ... ... ...
12 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
5.59 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 5.59 ... ... ... ... ... ...
13 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
8.41 arcsec ... ... 1.21 (a/b) ... ... ... 75.69
[B1950]
B exponential scale length 6.81E+14 8.41 ... 0.83 0.17 0.19 34 76
[J2000]
14 ESO-LV IIIa-F
1989ESOLV.C...0000L
3.69 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 3.69 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J00002656-1850308       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 13.9       arcsec               2a = 27.80 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 20.57 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.740                         b/a = 0.74
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.26
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.29
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 42 deg
Position Angle [Equinox]      :   65   deg [J2000]                  65 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          : 0.110738        -18.841879    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 20032MASX.C.......: Published Object Name : 2MASX J00002656-1850308 Frequency Targeted : K_s (2MASS "total") Major Axis (2a) : a = 24.5 arcsec 2a = 48.90 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 36.19 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.740 b/a = 0.74 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.26 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.29 Uncertainty : ... ... Cos-1(b/a) : ... 42 deg Position Angle [Equinox] : 65 deg [J2000] 65 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 : 0.110738 -18.841879 (J2000) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1982ESOU..C...0000L Published Object Name : ESO 538- G 015 Frequency Targeted : ESO-Uppsala "Quick Blue" IIa-O Major Axis (2a) : 1.10 arcmin 2a = 66.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.90 arcmin 2b = 54.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.82 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.18 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.20 Uncertainty : ... ... Cos-1(b/a) : ... 35 deg Position Angle [Equinox] : ... ... Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : About 25.5 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 : "Outer" diameter Coordinates Targeted : 235705. -190712. (B1950) Qualifiers : From new, raw data NED Comment : Diameters flagged uncertain.
No. 4 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 37.58 arcsec 2a = 37.58 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 45.33 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 5 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 44.16 arcsec 2a = 44.16 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 53.27 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 26.0 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 6 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 50.70 arcsec 2a = 50.70 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 61.16 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 27.0 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 7 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 23.44 arcsec 2a = 23.44 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 28.28 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 70% total B light 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 8 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 27.86 arcsec 2a = 27.86 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 33.61 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 80% total B light 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 9 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 34.67 arcsec 2a = 34.67 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 41.82 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 90% total B light 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 : Microphotometer scan of photographic plate or film Measured Quantity : Isophotal diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 10 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 17.38 arcsec 2a = 17.38 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 20.97 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : 50% total B light, major dia. 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 : Microphotometer scan of photographic plate or film Measured Quantity : Half-light ("effective") diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 11 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 15.85 arcsec 2a = 15.85 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 : 50% total B light, aperture 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 : Microphotometer scan of photographic plate or film Measured Quantity : Half-light ("effective") diameter Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Circular aperture
No. 12 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 5.59 arcsec 2a = 5.59 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 : B disk exp. scale length 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 : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 13 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 8.41 arcsec 2a = 8.41 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 10.14 arcsec Uncertainty : ... ... Axis Ratio : a/b = 1.21 b/a = 0.83 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.17 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.19 Uncertainty : ... ... Cos-1(b/a) : ... 34 deg Position Angle [Equinox] : 75.69 deg [B1950] 76 deg [J2000] Uncertainty : ... ... Significance : No uncertainty reported Diameter Reference Level : B exponential scale length 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 : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Elliptical isophote
No. 14 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 5380150 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 3.69 arcsec 2a = 3.69 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 : R exponential scale length Frequency : 6400 A 4.68E+14 Hz Frequency Mode : Broad-band detector (e.g. photographic plate) Measurement Mode Detector Type : Photographic plate, print, or film Fitting Technique : Microphotometer scan of photographic plate or film Measured Quantity : Scale length Coordinates Targeted : 359.468231 -19.120920 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants

Back to NED Home