Table 1. Delta-m Catalog Method Statistics 8 July 2013
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Method Description | Code | Number | Mean Delta-m |
---------------------------------------------+------+---------+--------------+
Refractor, micrometer | A | 0 | . |
Comparison image micrometer | C | 0 | . |
Heliometer | D | 0 | . |
wide field CCD astrometry | E | 0 | . |
CCD astrometry | F | 5 | 1.10 |
Photographic, with astrograph | G | 3 | 0.21 |
Photographic, medium or long-focus technique | H | 5 | 1.71 |
includes ocular enlargement | | | |
Visual interferometer, aperture is of largest| J | 0 | . |
baseline on the monolithic mirror (e.g., | | | |
Finsen's 26" or 240" on the 20 foot beam | | | |
used on the 100") | | | |
Long baseline interferometer | K | 3 | 1.99 |
aperture is of largest telescope or | | | |
siderostat not the baseline. | | | |
Electronographic camera | L | 1 | 2.00 |
Meridian circle | M | 543 | 1.21 |
Visual measures with double-image micrometer | N | 0 | . |
Lunar Occultation | O | 49 | 1.93 |
Photoelectric phase-grating interferometer | P | 1217 | 1.10 |
HST (FGS, WFPC, NICMOS, etc.) | Q | 0 | . |
micrometer plus comparison image micrometer | R | 0 | . |
Speckle interferometry | S | 5 | 0.98 |
Hipparcos or Tycho type observation | T | 0 | . |
Adaptive Optics | U | 0 | . |
Photocell with diaphragm in focal plane | V | 0 | . |
Area scanner | W | 0 | . |
Visual estimate made with objective grating | X | 76 | 1.13 |
Wedge photometer | Y | 0 | . |
double-image or polarizing photometer | Z | 3484 | 2.20 |
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Total 5392 1.83