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THE LICK OBSERVATORY. | 21 |
| 4. LICK OBSERVATORY BULLETIN, Nos. 1 to 20; established in 1901. |
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5. About 1000 papers published in technical astronomical journals. |
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These publications are not on sale. They are distributed on exchange to other observatories, academies of sciences, leading libraries, and investigators. |
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The writer regrets that lack of space prevents even the enumeration of the many discoveries made, but the following list contains a few of the results attained: |
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1. The fifth satellite of Jupiter was discovered in September, 1892. It revolves around the planet once in 11h 57m 22s.6, and is probably about 100 miles in diameter. It is so difficult of observation that, besides members of the Lick Observatory staff, probably not more than twenty persons have seen it. |
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2. The speed of the planetary nebulae in their motions through space is of the same order of magnitude as the speed of the stars. |
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3. Twenty-five comets - 17 unexpected and 8 periodic - have been discovered. |
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4. The unequaled Lick series of comet photographs has taught us more as to the structure, formation, and dissolution of comets' tails than had been learned in all previous time. |
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5. About 1300 new double stars have been discovered. |
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6. The period of revolution of the double star delta Equulei has been shown to be 53/4 years, the shortest period previously known for any double star being 11.4 years. It is therefore in many ways the most interesting double star under observation. |
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