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List of periodic comets

Periodic comets are comets with orbital periods of less than 200 years or that have been observed during more than a single perihelion passage. "Periodic comet" is sometimes used to mean any comet with a periodic orbit if greater than 200 years. Periodic comets receive a permanent number prefix after the second perihelion passage, why there are a number of unnumbered periodic comets, such as P/2005 T5. Comets that are not observed after a number of perihelion passages, or presumed to be destroyed, are given the D designation, comets given a periodic number and subsequently lost are given D instead of P, such as 3D/Biela or 5D/Brorsen. In nearly all cases, comets are named after their discoverer, but in a few cases such as 2P/Encke and 27P/Crommelin they were named for a person who calculated their orbits; the long-term orbits of comets are difficult to calculate because of errors in the known trajectory that accumulate with perturbations from the planets, in the days before electronic computers some people dedicated their entire careers to this.

So, quite a few comets were lost because their orbits are affected by non-gravitational effects such as the release of gas and other material that forms the comet's coma and tail. Unlike a long-period comet, the next perihelion passage of a numbered periodic comet can be predicted with a high degree of accuracy. Periodic comets sometimes bear the same name repeatedly. In the literature, an informal numbering system is applied to periodic comets, thus 181P and 192P are known as Comet Shoemaker–Levy 6 and Comet Shoemaker–Levy 1, respectively. Non-periodic Shoemaker–Levy comets are interleaved in this sequence: C/1991 B1 between 2 and 3, C/1991 T2 between 5 and 6, C/1993 K1 and C/1994 E2 after Shoemaker–Levy 9. In comet nomenclature, the letter before the "/" is either "C", "P", "D", "X", "I" for an interstellar object, or "A" for an object, either mistakenly identified as a comet, but is a minor planet, or for an object on a hyperbolic orbit that does not show cometary activity; some lists retain the "C" prefix for comets of periods larger than about 30 years until their return is confirmed.

While Jupiter-family comets are defined by, they can be loosely defined by any comet with a period of less than 20 years, a low inclination, an orbit coinciding loosely with that of Jupiter's. These comets are patchily observed, as orbital interactions with the planet cause comets' orbits to become perturbed, causing them to not be found at the expected position in the sky and subsequently lost. Additionally, their low cometary albedos and frequent proximity to the Sun compared to Oort Cloud comets cause them to much more become depleted of volatiles, making them comparatively dimmer than comets with longer orbital periods. List of comets by type List of numbered comets List of non-periodic comets Minor Planet Center Periodic Comet Numbers Cometography.com Periodic Comets Seiichi Yoshida's Comet Catalog MPC: Dates of Last Observation of Comets

Helsinki Convention on the Protection of the Marine Environment of the Baltic Sea Area

Convention on the Protection of the Marine Environment of the Baltic Sea Area, 1992 is an international convention encompassing various measures for the prevention and elimination of pollution of the Baltic Sea. The first Convention on the Protection of the Marine Environment of the Baltic Sea Area was signed by Denmark, West Germany, East Germany, Poland, USSR and Sweden in 1974 and entered into force on 3 May 1980. A new convention was signed in 1992 by Czechoslovakia, Estonia, the European Community, Germany, Lithuania, Poland and Sweden; the Convention on the Protection of the Marine Environment of the Baltic Sea Area, 1992, entered into force on 17 January 2000. The States-Parties to the Convention agreed individually or jointly to take all appropriate legislative, administrative or other relevant measures to prevent and eliminate pollution in order to promote the ecological restoration of the Baltic Sea Area and the preservation of its ecological balance; the Parties undertake to apply: Precautionary principle, that is, to take preventive measures when there is reason to assume that substances or energy introduced, directly or indirectly, into the marine environment may create hazards to human health, harm living resources and marine ecosystems, damage amenities or interfere with other legitimate uses of the sea.

The aim of the States-Parties to the Convention is to prevent and eliminate pollution of the marine environment of the Baltic Sea Area caused by harmful substances from all sources, including: from land-based sources. The States-Parties to the Convention are obligated to notify and enter into consultations with each other when an environmental impact assessment of a proposed activity is to cause a significant adverse impact on the marine environment of the Baltic Sea Area, they are to notify and consult each other whenever a pollution incident in their territory is to cause pollution to the marine environment of the Baltic Sea Area outside its territory and adjacent maritime area. The Convention sets up a Baltic Marine Environment Protection Commission, whose responsibilities are to implement the Convention, make recommendations to the Parties, define pollution control criteria and objectives and promote additional measures in co-operation with respective governmental bodies of the Parties.

The Parties undertake to implement measures to maintain adequate ability and to respond to pollution incidents in order to eliminate or minimize the consequences of these incidents and report to the HELCOM commission on and inform the general public of the measures taken in accordance with the Convention

3-Benzoxepin

3-Benzoxepin is an annulated ring system with an aromatic benzene ring and a non-aromatic, oxygen-containing seven-membered heterocyclic oxepin. The first synthesis was described by Karl Dimroth and coworkers in 1961, it is one of the three isomers of the benzoxepins. 3-Benzoxepin itself is a non-natural compound, but the bicyclic ring system is part of the occurring compounds perilloxin from Perilla frutescens and tenual and tenucarb from Asphodeline tenuior. Perilloxin inhibits the enzyme cyclooxygenase with an IC50 of 23.2 μM. Non-steroidal anti-inflammatory drugs like aspirin and ibuprofen work by inhibiting the cyclooxygenase enzyme family. Unsubstituted 3-benzoxepin can be synthesized through a double Wittig reaction from o-phthalaldehyde with bis--dimethylether-dibromide; the latter compound can be synthesized from α,α′-dibromodimethyl ether, accessible from hydrobromic acid and triphenylphosphine. The reaction is performed in dry methanol with sodium methoxide, the product is obtained in 55% yield.

The compound can be obtained through UV-irratiation of certain naphthalene derivatives such as 1,4-epoxy-1,4-dihydronaphthalene. It can be obtained by photooxidation of 1,4-dihydronaphthalene, followed by pyrolysis of the formed hydroperoxides; the latter syntheses give 3-benzoxepins in low yields. 3-Benzoxepin is a bright yellow solid that crystallizes in platelets, with a smell similar to naphthalene. The material is soluble in organic solvents. Like naphthalene, it can be purified through sublimation; the solid is acid-resistant, only under refluxing in concentrated, acidic alcohol solutions an unsaturated aldehyde is formed. Catalytic hydrogenation with a palladium catalyst results in 1,2,4,5-tetrahydro-3-benzoxepin

SS Inca

SS Inca was a steamship on Lake Titicaca. The Peruvian Corporation, a UK-owned company, had controlled Peru's railways and lake shipping since 1890. Traffic had outstripped the capacity of the corporation's hitherto largest lake steamer SS Coya and ageing Yavari and Yapura. Accordingly, in 1904, the corporation ordered the Inca, which at 1,809 tons was by far the lake's largest ship to date. Earle's Shipbuilding of Kingston upon Hull on the Humber in England built Inca as a "knock down" ship; the pieces were shipped by sea to South America and by rail to Lake Titicaca, where Inca was riveted together and launched. Each part had to fit within a packing crate no more than 10 feet wide and 11 feet high to fit within the railway's loading gauge, weigh no more than 12 tons to be within the railway's axle loading. In the 1920s, Earle's supplied a new bottom for the ship, delivered in kit form. Traffic continued to increase, so in 1929, the corporation ordered an larger ship from Earle's, SS Ollanta, to work along with the Inca.

In 1975, the Peruvian Corporation was nationalised and Inca's ownership passed to the state railway company ENAFER. She survived in serviceable condition, but in 1994, Inca was scrapped

Petar MudreŇ°a

Petar Mudreša is a Serbian footballer. Despite never having played in the Serbian SuperLiga, he played in a number of lower leagues clubs such as two former top league clubs FK Bečej and FK Mladost Apatin, but with FK Radnički Sombor and ČSK Pivara. Between January 2008 and January 2009, he played in a Premier League of Bosnia and Herzegovina club NK Čelik Zenica, in January 2010 has decided to move abroad again, this time to the neighbouring Albanian Superliga club KS Apolonia Fier. Since January 2011 he has been back in Serbia, this time playing for the first time in the top league by signing with FK Hajduk Kula. For the 2014–15 season, Mudreša was the member of Tápé ESK. Profile and stats at Srbijafudbal. Petar Mudreša at FootballDatabase.eu Petar Mudreša at Soccerway Petar Mudreša Stats at Utakmica.rs FK Vrbas statstika sezona

Trenton Shooting Stars

The Trenton Shooting Stars were a professional basketball team in the International Basketball League from 1999 to 2001. The team was owned by Herb Greenberg and Larry Keating was the president: Kevin Mackey was named coach and director of basketball operations in May 1999, the newly opened Sovereign Bank Arena was the home court. During the IBL inaugural draft the Shooting Stars selected the following players: Kevin Ollie, Mark Baker, Shawnelle Scott, Todd Lindeman, Tyrone Grant, James Martin, Willie Simms, Moochie Norris, LaMarr Greer, Ryan Bowen and Cassette Wesson. Mackey resigned on January 19, 2000 citing health issues, he was replaced by his assistant coach John Carideo, who stayed as the head coach until the end of the 2000–01 season. In the first IBL season the team finished with a 32–32 record: Ray Tutt was the leading scorer with 19.4 points per game, while Tyrone Grant led the team in rebounds with 8.8 and Ryan Lorthridge was the assist leader with 8 per game. Lorthridge was the league assist leader.

The Shooting Stars qualified for the playoffs, finishing second in the East Division behind the Cincinnati Stuff, but lost in the first round of the playoffs to the Richmond Rhythm. In the second season, the team finished with an improved record of 27–25 and again qualified for the playoffs: they defeated the Cincinnati Stuff in the first round, but lost in the second round to the Grand Rapids Hoops. For the second year in a row, Ryan Lorthridge led the IBL in assists with 8.6 per game. The franchise ceased operations after the IBL folded in 2001. All-IBL First team: Ryan Lorthridge, Ray Tutt All-IBL Second team: Ray Tutt INTERNATIONAL BASKETBALL LEAGUE HISTORY on apbr.org