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Date and Time of the Query: 2019-06-19 T04:31:59 PDT
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Diameter data point(s) for object IC 2531

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
0.50 arcmin 0.40 arcmin ... ... ... ... ... Intermed. surface brightness 7.40E+14 30.00 ... 0.80 0.20 0.22 37 ...
2 POSS1 103a-O
1968MCG4..C...0000V
7.00 arcmin 0.50 arcmin ... ... ... ... ... Moderate surface brightness 7.40E+14 420.00 ... 0.07 0.93 0.99 86 ...
3 ESO-Uppsala "Quick Blue" IIa-O
1982ESOU..C...0000L
8.00 arcmin 0.80 arcmin ... ... ... ... 75
[B1950]
About 25.5 B-mag arcsec^-2^ 6.81E+14 480.00 ... 0.10 0.90 0.98 84 75
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
384.59 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 384.59 ... 0.10 0.90 0.98 84 75
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
462.38 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 462.38 ... 0.10 0.90 0.98 84 75
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
524.81 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 524.81 ... 0.10 0.90 0.98 84 75
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
275.42 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
70% total B light 6.81E+14 275.42 ... 0.10 0.90 0.98 84 75
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
319.89 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
80% total B light 6.81E+14 319.89 ... 0.10 0.90 0.98 84 75
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
384.59 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
90% total B light 6.81E+14 384.59 ... 0.10 0.90 0.98 84 75
[J2000]
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
211.35 arcsec ... ... 10.00 (a/b) ... ... ... 75.00
[B1950]
50% total B light, major dia. 6.81E+14 211.35 ... 0.10 0.90 0.98 84 75
[J2000]
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
81.28 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 81.28 ... ... ... ... ... ...
12 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
122.60 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 122.60 ... ... ... ... ... ...
13 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
29.23 arcsec ... ... 5.12 (a/b) ... ... ... 71.09
[B1950]
B exponential scale length 6.81E+14 29.23 ... 0.20 0.80 0.93 79 71
[J2000]
14 ESO-LV IIIa-F
1989ESOLV.C...0000L
15.13 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 15.13 ... ... ... ... ... ...
15 RC3 D_25, R_25 (blue)
1991RC3.9.C...0000d
1.84 log(2a) + 1 ... ... 1.09
log(a/b)
0.02 ... ... 75
[J2000]
25.0 B-mag arcsec^-2^ 6.81E+14 415.10 19.60 0.08 0.92 0.99 85 75
[J2000]
16 RC3 D_0 (blue)
1991RC3.9.C...0000d
1.86 log(2a) + 1 ... ... ... ... ... ... ... 25.0 B-mag arcsec^-2^ 6.81E+14 434.70 ... ... ... ... ... ...
17 K_s (LGA/2MASS isophotal)
2003AJ....125..525J
94.7 (a) arcsec ... ... 0.240 (b/a) ... ... ... 75.0
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 189.40 ... 0.24 0.76 0.89 76 75
[J2000]
18 K_s (LGA/2MASS "total")
2003AJ....125..525J
190.5 (a) arcsec ... ... 0.240 (b/a) ... ... ... 75.0
[J2000]
Diameter for "total" magnitude 1.38E+14 381.00 ... 0.24 0.76 0.89 76 75
[J2000]


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 1968MCG4..C...0000V
Published Object Name         : MCG -05-24-015                
Frequency Targeted            : POSS1 103a-O                  
Major Axis (2a)               : 0.50       arcmin                   2a = 30.00 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : 2b =  0.40      arcmin              2b = 24.00 arcsec 
Uncertainty                   : ...                                 ...
Axis Ratio                    : ...                                 b/a = 0.80
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.20
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.22
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 37 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         : "Inner" diameter
Coordinates Targeted          : 095748          -2923    (B1950)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 1968MCG4..C...0000V Published Object Name : MCG -05-24-015 Frequency Targeted : POSS1 103a-O Major Axis (2a) : 7.00 arcmin 2a = 420.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.50 arcmin 2b = 30.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.07 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.93 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.99 Uncertainty : ... ... Cos-1(b/a) : ... 86 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 : 095748 -2923 (B1950) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1982ESOU..C...0000L Published Object Name : ESO 435- G 025 Frequency Targeted : ESO-Uppsala "Quick Blue" IIa-O Major Axis (2a) : 8.00 arcmin 2a = 480.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.80 arcmin 2b = 48.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75 deg [B1950] 75 deg [J2000] 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 : 095741. -292230. (B1950) Qualifiers : From new, raw data NED Comment : Major diameter flagged uncertain.
No. 4 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 384.59 arcsec 2a = 384.59 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 3845.90 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 462.38 arcsec 2a = 462.38 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 4623.80 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 524.81 arcsec 2a = 524.81 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 5248.10 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 275.42 arcsec 2a = 275.42 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 2754.20 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 319.89 arcsec 2a = 319.89 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 3198.90 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 384.59 arcsec 2a = 384.59 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 3845.90 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 211.35 arcsec 2a = 211.35 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 2113.50 arcsec Uncertainty : ... ... Axis Ratio : a/b = 10.00 b/a = 0.10 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.90 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.98 Uncertainty : ... ... Cos-1(b/a) : ... 84 deg Position Angle [Equinox] : 75.00 deg [B1950] 75 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 81.28 arcsec 2a = 81.28 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 122.60 arcsec 2a = 122.60 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 29.23 arcsec 2a = 29.23 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 149.90 arcsec Uncertainty : ... ... Axis Ratio : a/b = 5.12 b/a = 0.20 Uncertainty : ... ... 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] : 71.09 deg [B1950] 71 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 : 149.420837 -29.375000 (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 4350250 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 15.13 arcsec 2a = 15.13 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 : 149.420837 -29.375000 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : From fits to surf. brightness in octants
No. 15 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : ESO 435- G 025 Frequency Targeted : RC3 D_25, R_25 (blue) Major Axis (2a) : log(2a) + 1 = 1.84 2a = 415.10 arcsec Uncertainty : 0.02 19.60 arcsec Minor Axis (2b) : ... 2b = 33.62 arcsec Uncertainty : ... ... Axis Ratio : log(a/b) = 1.09 b/a = 0.08 Uncertainty : 0.03 0.01 Ellipticity : ... 1 - b/a = 0.92 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.99 Uncertainty : ... ... Cos-1(b/a) : ... 85 deg Position Angle [Equinox] : 75 deg [J2000] 75 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 : 095955.7 -293655. (J2000) Qualifiers : Homogenized from previously published data NED Comment :
No. 16 Published Units: Homogenized Units: Reference Code : 1991RC3.9.C...0000d Published Object Name : ESO 435- G 025 Frequency Targeted : RC3 D_0 (blue) Major Axis (2a) : log(2a) + 1 = 1.86 2a = 434.70 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 : 095955.7 -293655. (J2000) Qualifiers : Homogenized from previously published data NED Comment : Extinction and inclination corrected.
No. 17 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : IC 2531 Frequency Targeted : K_s (LGA/2MASS isophotal) Major Axis (2a) : a = 94.7 arcsec 2a = 189.40 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 45.46 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.240 b/a = 0.24 Uncertainty : ... ... 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] : 75.0 deg [J2000] 75 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 : 149.981430 -29.617800 (J2000) Qualifiers : From new, raw data NED Comment :
No. 18 Published Units: Homogenized Units: Reference Code : 2003AJ....125..525J Published Object Name : IC 2531 Frequency Targeted : K_s (LGA/2MASS "total") Major Axis (2a) : a = 190.5 arcsec 2a = 381.00 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 91.44 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.240 b/a = 0.24 Uncertainty : ... ... 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] : 75.0 deg [J2000] 75 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 : 149.981430 -29.617800 (J2000) Qualifiers : From new, raw data NED Comment :

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