102 



The New Planet Asia. [No. 11, new series. 



although as before remarked, at the cost of more than double the 

 time and trouble they ought to have given. 



Madras Mean Times 

 1861. 

 h. Ml s. 

 Apr. 17—12 53 40 

 ,,—14 7 37 



18— 11 50 39 



19— 13 49 27 



20— 11 46 44 

 ,,—13 20 12 



21— 11 59 5 

 23—12 13 6 



,,—13 31 56 



28— 10 31 4 

 ,,—11 57 33 



29— 9 55 49 

 ,,—11 58 23 



30— 10 12 56 

 May 1— 9 48 11 



,,—13 0 13 



2— 11 34 17 

 „— 13 3 18 



3— 11 12 33 

 ,,—13 4 26 



11— 13 16 47 



12— 10 15 45 



Apparent 

 Right Ascension 



h. m. s. 



15 51 

 15 51 



14.76 

 13.58 

 15 50 50.72 

 15 50 20.72 

 15 49 53.93 

 15 49 51.84 

 15 49 22.97 



15 48 



15 48 



15 45 



15 45 



15.72 

 14.04 

 6.30 

 3.26 



15 44 24.56 



15 41 19.78 



15 43 39.05 



15 42 54.97 



15 42 48.11 



15 42 4.89 



15 42 1.79 



15 41 17.88 



15 41 13.97 



15 34 17,61 



15 33 30.18 



Apparent 

 North Polar Distance 

 o ' » 



106 

 106 

 105 

 105 

 105 

 105 

 105 

 105 

 105 

 105 

 104 

 104 

 104 

 104 

 104 

 101 

 104 

 104 

 104 

 103 

 103 



6 

 1 

 55 

 49 

 49 

 43 

 31 

 31 

 0 

 0 

 54 

 54 

 47 

 41 

 40 

 34 

 33 

 27 

 26 

 32 

 25 



22.9 

 12.7 



7.0 

 50.1 

 23.6 

 55.3 

 57.3 

 31 4 

 51 8 

 30.4 

 32.8 



5.5 

 49.7 

 16.6 

 18.4 



6.8 

 42.4 

 31.8 

 56.3 



3.8 

 58.1 



dumber of Observer's 

 Compari- Initial, 

 sons. 



5 



10 

 12 

 9 



12 

 13 

 11 

 10 

 8 

 12 

 8 

 9 

 8 

 8 



12 

 9 

 10 

 12 

 12 

 14 

 18 



R 

 P 



»> 

 R 



P 

 R 

 P 

 R 

 »» 

 P 

 II 

 P 



>» 

 R 

 P 



The magnitude or brilliancy of the Planet has been estimated on 

 ten nights as follows : — 



April 17 

 18 

 19 

 21 

 29 



12,0 

 11.7 

 11.2 

 11.5 

 11 0 



1. 



2 

 3. 

 11, 

 12 



.11.0 

 .11.0 

 .10.8 

 . 10.6 

 .11.0 



I may here remark, that all estimations of magnitude are based 

 upon my photometric formula for any telescope, viz. — 



Limit of Vision = 9.2 f 5 X log. aperture in inches : — 



The ratio of light for one magnitude being 2.512, i. e. — that a star 

 of a certain order contains two and a half times the light of the next 

 fainter class. —Thus the naked eye penetrating to the 6th magni- 

 tude, a telescope one inch in aperture will shew Stars of the 9.2 

 magnitude ; one nine inches in aperture the 14th magnitude, &c. &c. 



Madras Observatory, ) N , R. Pogson, 



June 10, 1861, / Government Astronomer . 



