MR. J. BAXENDELL ON T CORONA. 279 



XXI. Observations of the New Variable Star, T Corona. 

 By Joseph Baxendell, F.R.A^S. 



Eead November 27th, 1866. 



While engaged on the higlit of the 15th of May last in 

 observing some of the naked-eye variables^ my attention 

 was suddenly arrested by a strange and rather conspicuous 

 star about a degree distant from e Coronse, in the south 

 following quadrant. It was at once carefully compared 

 with some of the neighbouring stars^ in order to ascertain 

 its magnitude exactly ; and a rough determination of its 

 position was made^ which led me to conclude that it was 

 identical with Argelander^s No. 2765 of Zone +26°, 9*5 

 magnitude^ of the ' Bonner Sternverzeichniss/ — a conclu- 

 sion which was fally confirmed the following night by more 

 exact observations. On the night of the 7th of May I 

 observed all the naked-eye variables then visible^ and also 

 several telescopic ones_, and among the latter B and S 

 Coronas ; but this star, if at that time really visible, entirely 

 escaped my notice ; and as the nights between the 7th 

 and 15th were cloudy at Manchester, I am unable to say 

 at what date it attained its maximum brilliancy. My ob- 

 servations of its magnitude, colour, &c. from the date of 

 discovery to the present time are as follows, and I may add 

 that all determinations of magnitude after the star became 

 invisible to the naked eye were, with only three exceptions^ 

 made at Mr. Worthington^s observatory with his equa- 

 torially mounted achromatic of five inches aperture, care 

 being taken to use always the same eyepiece, a positive, 

 having a magnifying-power of 68 times. 



