Information: - The Smithsonian Astrophysical Observatory (SAO) is a research institute of the Smithsonian Institution headquartered in Cambridge, Massachusetts, where it is joined with the Harvard College Observatory (HCO) to form the HarvardSmithsonian Center for Astrophysics (CfA). - 1252 Celestia , provisional designation 1933 DG , is a stony main - belt asteroid discovered on February 19 , 1933 , by American astronomer Fred Whipple at Oak Ridge Observatory operated by the Harvard - Smithsonian Center for Astrophysics at Massachusetts , United States . The S - type asteroid measures about 17 kilometers in diameter , rotates once every 10.6 hours and is heavily tilted towards the ecliptic by almost 34 degrees . It was named after the mother of the discoverer , Celestia MacFarland Whipple . - The Oak Ridge Observatory, also known as the George R. Agassiz Station, is located at 42 Pinnacle Road, Harvard, Massachusetts. It was operated by the Harvard-Smithsonian Center for Astrophysics as a facility of the Smithsonian Astrophysical Observatory (SAO) until August 19, 2005. Given the information above, choose from the list below the object entity that exhibits the relation 'site of astronomical discovery' with the subject '1252 celestia'. Choices: - harvard college observatory - oak ridge observatory
harvard college observatory

Information: - Oslo Brs (OSE: OSLO) offers Norways only regulated markets for securities trading today. The stock exchange offers a full product range including equities, derivatives and fixed income instruments. Oslo Brs is the only independent stock exchange within the Nordic countries. - The Oslo Stock Exchange ( Norwegian : Oslo Brs ) serves as the main market for trading in the shares of Norwegian companies . It opens at 9:00am and closes 4:30pm local time ( CET ) . In addition to a wide range of domestic companies , the OSE attracts a lot of international companies within petroleum , shipping and other related areas . The stock exchanged opened in April 1819 ( as Christiania Brs ) , but did n't list stocks and shares until 1 March 1881 . The first list of prices showed 23 shares . From 1920 to 1936 , whaling shares accounted for about 50 % of total turnover . In addition to Norwegian and foreign companies with shares listed on Oslo Stock Exchange , the list also includes equity certificates issued by Norwegian savings banks . The difference between shares and equity certificates is connected to the ownership of the company 's assets and leverage in the administrative bodies of the banks . - Petroleum (from : "rock" + "oleum": "oil". ) is a naturally occurring, yellow-to-black liquid found in geological formations beneath the Earth's surface, which is commonly refined into various types of fuels. Components of petroleum are separated using a technique called fractional distillation. - Earth, otherwise known as the world, is the third planet from the Sun and the only object in the Universe known to harbor life. It is the densest planet in the Solar System and the largest of the four terrestrial planets. Given the information above, choose from the list below the object entity that exhibits the relation 'country' with the subject 'list of companies listed on the oslo stock exchange'. Choices: - norway - world
norway