THE SMALL PLANETS. 507 



Berlin Observatory, with the assistance of Dr. "Wolfers, that 

 the ephemerides of the increasing host of small planets are 

 treated of with particular completeness. Up to the present 

 time, the region nearest to the orbit of Mars appears to be 

 the most filled ; but the breadth of this measured zone is, in 

 itself, more considerable than the distance of Mars from the 

 Sun,* 1 "when the difference of the radii-vectores in the nearest 

 perihelion (Victoria), and the most distant aphelion (Hygiea), 

 is taken into consideration." 



The excentricities of the orbits, of which those of Ceres, 

 Egeria, and Vesta are the smallest, and Juno, Pallas, and Iris 

 the greatest, have already been alluded to* 2 above, as well as 

 their degrees of inclination towards the ecliptic, which 

 decreases from Pallas (34 37'), and Egeria (16 33'), to 

 Hygiea (3 47'). A tabular view of the elements of the 

 small planets follows here, for which I am indebted to my 

 friend Dr. Galle. 



The discovery of a fifteenth new planet (Eunomta) has 

 just been announced. It was discovered by De Gasparis 

 upon the 19th of July, 1851. The elements, which have been 

 calculated by Riimker, are the following : 



Epoch of mean longitude in mean Greenwich time ... I Oct ^ 



Mean longitude 321 25' 29" 



Longitude of perihelion 27 35 38 



Longitude of ascending node ... 293 52 55 



Inclination 11 48 43 



Excentricity (H88402 



Half major axis ... ... 2'64758 



Mean of motion 823'630 



Period of revolution ... ... .. ... ... 1574 dafs. 



u D'Arrest, Ucber das System der Kleinen Planeten zwitchea 

 Mars und Jupiter, 1851, p. 8. 



* Cosmos, vol. iv. pp. 423 and 456. 



