296 On the Elements of the Four New Planets, 6?c. 



Its mean motion in its orbit, in a mean solar day, is 13' 32", 

 9304 ; its mean motion in 365 days is consequently 82° 25' 

 19", 60. 



The longitude of hs perihelion, on January 1, 1820, was in 

 53 # 33' 46". 



Its orbit is inclined to the plane of the ecliptic in an angle 

 of 13° 4' 9", 7. 



Its ascending node was on January 1, 1 820, in 171° 7' 40", 4. 



The eccentricity of its orbit is 0.257848 ; half the major axis 

 being considered as unity. 



The greatest equation of the centre is 29° 46' 19". 



^ Cekes. 



This planet was first discovered by M. Piazzi, on January 

 1, 1801. Its mean distance from the sun is 2767245, that of 

 the earth being considered as unity. 



It performs its mean sidereal revolution in 1681.3931 mean 

 solar days, and its mean synodical revolution is 466.62 days. 



Its mean longitude at mean noon at Greenwich, on January 

 1, 1820, was in 123° 16' 11", 9. 



Its mean motion in its orbit, in a mean solar day, is 12' 50", 

 9230 ; its mean motion in 365 days is consequently 78° 9' 

 46", 89. 



The longitude of its 'perihelion, on January 1, 1820, was in 

 147° 7' 31", 5 ; which, according to M. Gauss, is subject to 

 an apparent annual motion of + ^ 1"? 3. 



Its orbit is inclined to the plane of the ecliptic in an angle 

 of 10° 37' 26", 2 ; which, according to Mr Gauss, has an an- 

 nual decrease of 0", 44. 



Its ascending node was, on January 1, 1820, in 80° 41 ' 24". 

 According to M. Gauss, it has an apparent annual motion of 

 + 1" 48. 



The eccentricity of its orbit is 0.078439, half the major 

 axis being considered as unity; which, according to M. Gauss, 

 is subject to an annual decrease of 0.00000583. 



The greatest equation of the centre is 8° 59' 42". 



Pallas. 

 This planet was discovered by Dr Olbers on March 28, 



