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Date and Time of the Query: 2019-06-16 T03:37:50 PDT
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Diameter data point(s) for object IC 1991

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.......:
10.3 (a) arcsec ... ... 0.580 (b/a) ... ... ... 35
[J2000]
20.0 K-mag arcsec^-2^ 1.38E+14 20.60 ... 0.58 0.42 0.50 55 35
[J2000]
2 K_s (2MASS "total")
20032MASX.C.......:
20.1 (a) arcsec ... ... 0.580 (b/a) ... ... ... 35
[J2000]
Diameter for "total" magnitude 1.38E+14 40.10 ... 0.58 0.42 0.50 55 35
[J2000]
3 ESO-Uppsala "Quick Blue" IIa-O
1982ESOU..C...0000L
0.70 arcmin 0.30 arcmin ... ... ... ... 39
[B1950]
About 25.5 B-mag arcsec^-2^ 6.81E+14 42.00 ... 0.43 0.57 0.69 65 39
[J2000]
4 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
42.17 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
25.0 B-mag arcsec^-2^ 6.81E+14 42.17 ... 0.43 0.57 0.69 65 39
[J2000]
5 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
47.32 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
26.0 B-mag arcsec^-2^ 6.81E+14 47.32 ... 0.43 0.57 0.69 65 39
[J2000]
6 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
51.29 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
27.0 B-mag arcsec^-2^ 6.81E+14 51.29 ... 0.43 0.57 0.69 65 39
[J2000]
7 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
27.54 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
70% total B light 6.81E+14 27.54 ... 0.43 0.57 0.69 65 39
[J2000]
8 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
31.99 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
80% total B light 6.81E+14 31.99 ... 0.43 0.57 0.69 65 39
[J2000]
9 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
37.58 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
90% total B light 6.81E+14 37.58 ... 0.43 0.57 0.69 65 39
[J2000]
10 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
19.50 arcsec ... ... 2.33 (a/b) ... ... ... 39.00
[B1950]
50% total B light, major dia. 6.81E+14 19.50 ... 0.43 0.57 0.69 65 39
[J2000]
11 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
13.49 arcsec ... ... ... ... ... ... ... 50% total B light, aperture 6.81E+14 13.49 ... ... ... ... ... ...
12 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
8.47 arcsec ... ... ... ... ... ... ... B disk exp. scale length 6.81E+14 8.47 ... ... ... ... ... ...
13 ESO-LV "Quick Blue" IIa-O
1989ESOLV.C...0000L
0.46 arcsec ... ... 4.29 (a/b) ... ... ... 37.37
[B1950]
B exponential scale length 6.81E+14 0.46 ... 0.23 0.77 0.90 77 38
[J2000]
14 ESO-LV IIIa-F
1989ESOLV.C...0000L
0.08 arcsec ... ... ... ... ... ... ... R exponential scale length 4.68E+14 0.08 ... ... ... ... ... ...


Detailed Information for Each Entry

 No. 1
                                Published Units:                    Homogenized Units:

Reference Code                : 20032MASX.C.......:
Published Object Name         : 2MASX J03444677-5131242       
Frequency Targeted            : K_s (2MASS isophotal)         
Major Axis (2a)               : a = 10.3       arcsec               2a = 20.60 arcsec
Uncertainty                   : ...                                 ... 
Minor Axis (2b)               : ...                                 2b = 11.95 arcsec
Uncertainty                   : ...                                 ...
Axis Ratio                    : b/a = 0.580                         b/a = 0.58
Uncertainty                   : ...                                 ...
Ellipticity                   : ...                                 1 - b/a = 0.42
Uncertainty                   : ...                                 ...
Eccentricity                  : ...                                 [(a/b)2-1]/[(a/b)2+1] = 0.50
Uncertainty                   : ...                                 ...
Cos-1(b/a)                    : ...                                 55 deg
Position Angle [Equinox]      :   35   deg [J2000]                  35 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          : 56.194958       -51.523422    (J2000)
Qualifiers                    : From new, raw data
NED Comment                   :                                         

No. 2 Published Units: Homogenized Units: Reference Code : 20032MASX.C.......: Published Object Name : 2MASX J03444677-5131242 Frequency Targeted : K_s (2MASS "total") Major Axis (2a) : a = 20.1 arcsec 2a = 40.10 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 23.26 arcsec Uncertainty : ... ... Axis Ratio : b/a = 0.580 b/a = 0.58 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.42 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.50 Uncertainty : ... ... Cos-1(b/a) : ... 55 deg Position Angle [Equinox] : 35 deg [J2000] 35 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 : 56.194958 -51.523422 (J2000) Qualifiers : From new, raw data NED Comment :
No. 3 Published Units: Homogenized Units: Reference Code : 1982ESOU..C...0000L Published Object Name : ESO 200- G 056 Frequency Targeted : ESO-Uppsala "Quick Blue" IIa-O Major Axis (2a) : 0.70 arcmin 2a = 42.00 arcsec Uncertainty : ... ... Minor Axis (2b) : 2b = 0.30 arcmin 2b = 18.00 arcsec Uncertainty : ... ... Axis Ratio : ... b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39 deg [B1950] 39 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 : 034323. -514048. (B1950) Qualifiers : From new, raw data NED Comment :
No. 4 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 42.17 arcsec 2a = 42.17 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 98.30 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 47.32 arcsec 2a = 47.32 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 110.30 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 51.29 arcsec 2a = 51.29 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 119.56 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 27.54 arcsec 2a = 27.54 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 64.20 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 31.99 arcsec 2a = 31.99 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 74.57 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 37.58 arcsec 2a = 37.58 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 87.60 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 19.50 arcsec 2a = 19.50 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 45.45 arcsec Uncertainty : ... ... Axis Ratio : a/b = 2.33 b/a = 0.43 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.57 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.69 Uncertainty : ... ... Cos-1(b/a) : ... 65 deg Position Angle [Equinox] : 39.00 deg [B1950] 39 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 13.49 arcsec 2a = 13.49 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 8.47 arcsec 2a = 8.47 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 : 55.845833 -51.680000 (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 2000560 Frequency Targeted : ESO-LV "Quick Blue" IIa-O Major Axis (2a) : 0.46 arcsec 2a = 0.46 arcsec Uncertainty : ... ... Minor Axis (2b) : ... 2b = 1.97 arcsec Uncertainty : ... ... Axis Ratio : a/b = 4.29 b/a = 0.23 Uncertainty : ... ... Ellipticity : ... 1 - b/a = 0.77 Uncertainty : ... ... Eccentricity : ... [(a/b)2-1]/[(a/b)2+1] = 0.90 Uncertainty : ... ... Cos-1(b/a) : ... 77 deg Position Angle [Equinox] : 37.37 deg [B1950] 38 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 : 55.845833 -51.680000 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Derived scale length < 2" mean ESO-B PSF
No. 14 Published Units: Homogenized Units: Reference Code : 1989ESOLV.C...0000L Published Object Name : ESO-LV 2000560 Frequency Targeted : ESO-LV IIIa-F Major Axis (2a) : 0.08 arcsec 2a = 0.08 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 : 55.845833 -51.680000 (B1950) Qualifiers : From new, raw data; Corrected for contaminating sources NED Comment : Derived scale length < 2" mean ESO-B PSF

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