172 
Proceedings of the Royal Irish Academy. 
Date. 
Estimated 
IVlag. 
Remarks. 
1887. 
Feb. 5. 
3-90 
Strong moonlight. 
„ 8. 
4-07 
Do. 
„ 10. 
4-07 
Do. 
„ 11. 
4-07 
Clear ; no moon. 
Mar. 15. 
4-07 
Do. 
„ 29. 
3-95 
Clear ; crescent moon. 
April 6. 
3-90 
Clear ; strong moonlight. 
„ 8. 
3-90 
Do. do. 
„ 12. 
3-90 
Clear ; no moon. 
„ 16. 
3-90 
Do. 
June 9. 
3-97 
Clear; strong moonlight, 10.45 p.m. 
Sept. 7. 
4-07 
Clear; moon rising, 8.40 p.m. 
„ 29. 
3-97 
Strong moonlight, 8.20 p.m. 
„ 30. 
3-97 
Clear ; strong moonlight. 
Oct. 8. 
3-97 
Clear ; no moon. 
„ 9. 
3-97 
Very clear sky ; no moon. ' 
„ 25. 
3-86 
Clear ; strong moonlight. 
Dec. 10. 
4-07 
Clear ; no moon. 
„ 11. 
4-07 
Clear ; no moon ; freezing. 
„ 16. 
4-07 
Do. do. 
„ 17. 
4-07 
Clear ; moon setting, 6.20 p.m. 
„ 21. 
4-07 
Clear; strong moonlight ; ^ very reddish. 
„ 24. 
4-07 
Do. do. 
„ 27. 
3-97 
Do. do. freezing. 
The higliest recorded magnitude was 3*6 on May 11, 1885; and the 
lowest 4'8 on Sept. 4, 1883. The star is therefore variable from 3.6 m. 
to 4*8 M. on the scale of the Harvard Photometry. The variation is very 
irregular, the star sometimes remaining for several months at a time with 
scarcely any perceptible variation. 
The spectrum of /a Cephei is a fine specimen of Secchi's third tvpe. 
