IV/26 Hercules Messier 13 (M13) photometry (Ludendorff, 1905)
Der grosse Sternhaufen im Hercules Messier 13.
Ludendorff H.
<Publ. Astrophys. Obs. Potsdam, 50, 1 (1905)>
=1905POPot..50....1L 1905POPot..50....1L
ADC_Keywords: Clusters, globular
Description:
Ludendorff's catalog of the M13 globular cluster results from
observations made with the 32.5cm refractor of Potsdam Observatory,
one on 17 July 1900 (plate A), and the second on June 1902 (plate B).
Each plate was measured twice, in opposite position, to remove the
possible errors.
The catalog contains accurate positions on both plates, photographic
magnitudes, and comparison with the previous results from Scheiner
(1892).
Number 1119 to 1127 where seen only in one position on plate A,
and in two positions on plate B.
Number 1128 to 1136 where seen only on plate A, and are not
in Scheiner catalog.
Objects:
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RA (2000) DE Designation(s)
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16 41 41 +36 27.6 M 13 = NGC 6205
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
catalog.dat 90 1136 Catalog of stars in Messier 13
notes.dat 80 706 Individual notes (in German, english added)
notes2.dat 80 234 Individual remarks on Scheiner identifications,
and Scheiner catalog and charts
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Byte-by-byte Description of file: catalog.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq [1,1136]+ Sequential number of star in cluster
5 A1 --- n_Seq [*] indicates a note in notes.dat file
7- 8 I2 --- ma Brightness estimate from Plate A (2)
9 A1 --- n_ma [*] when the star is not clearly seen on both
plates
11- 12 I2 --- dm ? difference (ma-mb+1) between plates (2)
15- 21 F7.4 --- Xpos X mean position (in 5.sin(1arcmin))
23- 29 F7.4 --- Ypos Y mean position (in 5.sin(1arcmin))
32- 34 I3 30mas dXpos ? Position difference on 2 plates (A-B)
35 A1 --- u_dXpos [)] when star not found on the 2 reductions
38- 40 I3 30mas dYpos ? Position difference on 2 plates (A-B)
41 A1 --- u_dYpos [)] when star not found on the 2 reductions
43 A1 --- oRA- Offset in right ascension (sign) (1)
44 I1 arcmin oRAm Offset in right ascension (min) (1)
46- 50 F5.2 arcsec oRAs Offset in right ascension (s) (1)
52 A1 --- oDE- Offset in declination (sign) (1)
53 I1 arcmin oDEm Offset in declination (arcmin) (1)
55- 59 F5.2 arcsec oDEs Offset in declination (arcsec) (1)
62- 64 I3 --- S ? Number of the star in Scheiner's (1892)
65 A1 --- --- [-]
66- 68 I3 --- S2 ? when 2 Scheiner's numbers represent the star
69 A1 --- u_S [)] when Scheiner's star seen on 1 plate only
70 A1 --- n_S [+] disagreement with Scheiner's,
in notes2.dat file
72- 75 F4.1 mag Gr ? Magnitude assigned in Scheiner's catalog
78- 82 F5.2 arcsec dRA ? Difference in RA Ludendorff - Scheiner
83 A1 --- u_dRA [)] disagreement with Scheiner's
85- 89 F5.2 arcsec dDE ? Difference in DE Ludendorff - Scheiner
90 A1 --- u_dDE [)] disagreement with Scheiner's
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Note (1): The reference position is
RA = 16 38 06.14, DE = +36 39 19.06 (1900)
Note (2): the estimate consists in a number in the range 1 to 16;
this "Helligkeitsstuffe" (brightness step) is 1 for a photographic
magnitude of 8.5mag, 2 for 8.7, etc (i.e. mag = 8.3 + 0.2*ma).
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Byte-by-byte Description of file: notes.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq Sequential number (repeated when several lines)
6- 80 A75 --- Note Text of the note (English translation added)
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Byte-by-byte Description of file: notes2.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Seq ? Sequential number
6- 8 I3 --- S ? Scheiner number
13 A1 --- u_S [)] when Scheiner's star seen on 1 plate only
15- 80 A66 --- Note Text of the note
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History:
Prepared via OCR at CDS.
References:
Schreiner J., "Der Grosse Sternhaufen im Hercules Messier 13 nach
Aufnahmen am Potsdamer photographischen Refractor, Abh. der Koenigl.
Preuss. Akademie der Wissenschaften zu Berlin vom Jahre 1892.
(End) James Marcout, Patricia Bauer [CDS] 01-Jul-2003