Ball — Researches on Annual Parallax. 



361 



with, our micrometer. The distance in this was no less than 237" +, 

 which is greatly in excess of the distances measured in the regular 

 series of parallax observations contained in our previous publications. 

 Had there been any suitable companion star nearer to P iii 242, I 

 should certainly have preferred it, for the distance 237" is too great to 

 be measured by our micrometer with the accuracy which can be at- 

 tained when the distance is only about one or two minutes. From this 

 cause the results of the observations are not so satisfactory as I would 

 wish, though they are quite sufficient to show that P in 242 has no 

 considerable parallax. 



The following are the observations which I have made of the dis- 

 tance and position corrected for refraction, and reduced to the mean 

 places of the stars at the epoch 1879"0 : — 



P m 242. 

 Distance and Position o/BD + 37°, ^11 from P III 242. 



Date. 



Distance. 



Position. 



Date. 



Distance. 



Position. 



1879. 

 Jan. 11, 



Feb. 7, 

 „ 19, 

 » 22, 

 » 23, 

 „ 25, 



March 1, 

 „ 19, 



April 4, 

 ). 6, 

 „ 10, 



Aug. 14, 



„ 22, 



23 



Sept. 17, 



Oct. 4, 



237' 



■558 



237 



•529 



237 



•074 



237 



•174 



237 



•695 



237 



•348 



237 



•220 



237 



•605 



237 



•422 



237 



•495 



237 



•268 



236 



•973 



237 



•177 



237 



•242 



237 



•151 



207n7'-35 

 207 23 ^47 

 207 13 •le 

 207 16 -04 

 207 10 ^25 

 207 16 -96 

 207 9 -08 

 207 15 -99 

 207 9 ^27 

 207 14 •OO 

 207 15 -66 

 207 19 •IS 

 207 8 ^47 

 207 12 ^83 

 207 16 ^28 

 207 20 ^24 



1879. 

 Oct. 5, 



„ 17, 



„ 25, 



„ 25, 



Nov. 1, 



2, 



„ 11, 



Dec. 3, 



„ 5, 



„ 17, 



„ 18, 



„ 24, 



1880. 



Jan. 9, 



237' 



•203 



237 



•497 



237 



•315 



237 



•049 



236 



•965 



237 



•305 



237 



•041 



237 



•423 



237 



•588 



237 



•647 



237 



•186 



237 



•587 



237 



•215 



237 



•130 



236 



•715 



207° 17' -28 

 207 16 -14 

 207 17 -12 

 207 22 -83 

 207 8 -40 

 207 17 ^66 

 207 19 -72 

 207 21 -57 

 207 12 -86 



206 59 -53 



207 5 ^91 

 207 25 ^42 

 207 29 ^27 

 207 22 •SS 



207 20 •ee 



