INTRODUCTION 
XXI 
The following are abridged Tables of Corrections for the Uranometria Argen¬ 
tina. The total correction to be applied to the magnitudes of U.A. is for “scale” + 
“locality in sky.” 
U.A. Correction for Scale. 
Normal. 
Correction. 
Normal. 
Correction. 
M 
M 
m 
M 
2.0 
- .17 
4-5 
— .08 
2-5 
- .07 
5 -o 
— .20 
3-0 
— .02 
5-5 
- .18 
3-5 
+ .OI 
6.0 
- .09 
4.0 
.OO 
6-5 
+ .01 
7.0 
4- .08 
U.A. Corrections for Locality in Sky. 
\ RA 
& 
o h 
2 h 
4 h 
6 h 
8 h 
! O h 
I2 h 
I4 h 
. i6 h 
i8 h 
2 O h 
22 
M 
M 
M 
M 
M 
M 
M 
M 
M 
M 
M 
M 
0° 
4 - .2 
+ .2 
+ .1 
— .1 
— .1 
O 
+ .1 
O 
— .1 
0 
O 
+ .1 
— 10 
- 1 - .2 
4 -3 
+ .1 
— .1 
~ .1 
O 
+ .1 
O 
— .1 
0 
O 
+ .2 
— 20 
+ .2 
+ -3 
+ .2 
“ .1 
— .2 
O 
+ .1 
O 
— .1 
0 
O 
+ .2 
- 30 
4 - .2 
+ -3 
+ .2 
— .1 
“ -3 
O 
O 
— .1 
— .1 
— .1 
O 
+ .2 
- 40 
+ .2 
+ .2 
+ .1 
— .1 
~ -3 
— .1 
— .1 
— .2 
— .1 
— .1 
O 
+ .2 
- 5 ° 
+ .2 
+ .2 
+ .1 
- .1 
— .2 
— .2 
— .2 
— .2 
— .2 
— .1 
O 
+ .2 
— 60 
+ -2 
+ .2 
O 
— .1 
— .2 
— .2 
- -3 
— .2 
— .2 
— .1 
O 
+ .1 
- 70 
+ .1 
+ .1 
+ .1 
O 
— .1 
- -3 
- -3 
— .2 
— .1 
0 
O 
+ .1 
- 80 
O 
+ .1 
+ .1 
+ .1 
— .1 
— .2 
— .2 
— .2 
— .1 
0 
O 
O 
As already stated, Chandler’s manuscript catalogue furnishes the magnitudes 
to 6^5 inclusive. For the fainter stars as many as possible were computed at the 
Dudley Observatory with the aid of the foregoing tables of systematic correction. 
During this process the generally excellent agreement of the Harvard and Potsdam 
corrected results attracted marked attention. Down to the limit of the tables, 7^0, 
the systematic corrections appear to produce very satisfactory agreement between 
the Harvard and Potsdam results. Below this limit the corrections were roughly 
extrapolated for Potsdam and were assumed to remain unchanged from 7^0 for 
Harvard. For a large part of the stars in this Catalogue noted as fainter than 7^0, 
the magnitudes depend upon rather uncertain eye-estimates, such as those con¬ 
tained in the Durchmusterungs and in certain catalogues of meridian-observation 
for which estimates of magnitude are made with some care. These magnitudes are 
of course subject to errors very much exceeding those attributable to the magnitudes 
based upon Harvard and Potsdam photometries. 
In the case of double stars the differences of magnitudes of the components were 
mostly adopted from the Mensurce Micrometricee of Struve or from the photometric 
measures of the Harvard Observatory ( H.C.O . Annals , Vol. XI). However, this 
part of the work can lay no claim to critical exactness. 
It may not be superfluous to note again that a magnitude-equation determined 
in strict conformity with the Pogson scale (log. light ratio, .4) should be multiplied 
by 0.9 in order to reduce it to the scale of this Catalogue. 
The authority for noting variable stars has been Chandler’s Third Catalogue , 
and usually the limits of variation have been adopted from that authority. 
