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The sources

From these data sources, we have taken: all the nuclear magnitudes and total magnitudes observed at heliocentric distances r > 3 AU observed after 1950.

Some considerations are presented in Sect. 3.3 to justify the deletion of some data. Table 1 presents a summary of the sources and a general classification of the data. The numbers listed correspond to the data remaining after the deletions mentioned in Sect. 3.3.
 
 

Table 1: Statistics of our data sets
Number of observations (1) 3990
   
Data taken from CLICC 1474
Data taken from MPC 2392
Data taken from other sources (2) 124
   
Observations pre-perihelion 1968
Observations post-perihelion 2022
   
Reported nuclear magnitudes (3) 1952
Total magnitudes at r > 3 AU (3) 1073
   
Scotti's total magnitudes at r < 3 AU (4) 514
Scotti's total magnitudes at r > 3 AU (4) 553
Scotti's nuclear magnitudes (5) 412
   
Roemer's magnitudes 700
CCD nuclear magnitudes (6) 312
(1) For consistency with other observers, the observations by J. Scotti reported as total but taken at r < 3 AU are not included in these numbers.
(2) Observations taken from the ICQ after 1990 that did not appear in the MPCs (25), personal communication by C. Hergenrother (6), our own observations (48), data taken from the literature (45).
(3) Observations by J. Scotti are not included.
(4) Magnitudes reported as total.
(5) Magnitudes reported as nuclear, in most cases Scotti has applied a coma reduction method.
(6) Only the observations with medium and large aperture telescopes are included. This number may be underestimated, because for many observers we do not know which telescope was used.


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Gonzalo Tancredi

2000-03-07