378 INTERNATIONAL ASTRONOMICAL UNION Proc. N. A. S. 
ing to cooperative plan to secure necessary and sufficient observations to 
bring them through the preceding classes into a (1) or a (2). 
Class e. — Lost asteroids. These should be made the object of special 
orbit investigations to ascertain range of solution, and most probable 
orbit. 
Class /. — New discoveries. A fairly definite observational programme 
for necessary and sufficient observations during discovery opposition 
should be agreed upon, the discoverer to be responsible for the execution of 
the observational programme in codperation with one or two other observa- 
tories, the orbit determinations to proceed hand in hand with the observa- 
tions, so that a fairly accurate orbit may be available at end of discovery 
opposition to serve for incorporation of asteroid in one of the preceding 
classes. 
Accidental discoveries to be reported to central agency or agencies for 
assignment of observational programme and orbit computations. 
Particularly interesting cases, such as 1911 MX, or object Wolf 1918, 
etc., to be generally distributed by telegraph to stimulate observation and 
investigation. 
Class g. — Asteroids observed insufficiently even for preliminary orbit 
determinations. 
SUPPLEMENTARY RECOMMENDATIONS OF COMMITTEE ON COMETS AND 
ASTEROIDS 
Recommended for Reference to International Committee on Comets and 
Asteroids 
1. That mean places of aste/oids and comets visually observed with an 
equatorial be published instead of apparent places. At present the orbit 
computer makes no essential use of the apparent place reduction of the 
comparison star. It is practically universal to employ the mean place, 
corrected or uncorrected for annual aberration according to method, ob- 
tained by forming apparent place of object minus apparent place reduc- 
tion of comparison star. This mean place may also be obtained by ap- 
plying Aq; and A5 directly to mean place of comparison star. In case the 
orbit computer wishes to take account of the differential apparent place 
reduction, he would, if apparent place were discontinued, be limite i to the 
use of the differential formulae, which, however, are not longer than a 
single apparent place reduction. Thus it is seen that the proposed change 
would give the orbit computer directly what he uses ; would in no way in- 
crease his labor; would save the observer an apparent place reduction for 
every observation; and visual observations would be presented in the 
same way that photographic now are. 
2. That each observatory adopt its own distinctive provisional designa- 
tion for asteroids not identified up to the moment of publication with a 
previously discovered one. Washington has chosen W and Johannesburg 
