RP 1 (other)
RP 1, RP-1, RP.1, RP1, or ''variant'' may refer to: * RP-1, ''Rocket Propellant 1'' * RP1, ''retinitis pigmentosa 1 protein'' * RP1 asteroid ** 5580 Sharidake or ''1988 RP1'', asteroid Sharidake, RP1 from 1998, the 5580th asteroid catalogued ** (12728) 1991 RP1, RP1 from 1991, the 12728th asteroid catalogued ** 12576 Oresme or ''1999 RP1'', asteroid Oresme, RP1 from 1999, the 12576th asteroid catalogued * Mitsubishi RP-1, helicopter * Rensselaer RP-1, crewed glider * Radioplane RP-1, UAV * ''Ready Player One'', novel by Ernest Cline * RP1, real projective line See also * RPI (other) * RPL (other) RPL may refer to: Public Safety * Registured Public Safety Leader (RPL) Association of Public-Safety Communications Officials-International Medicine and biology * Recurrent Pregnancy Loss: recurrent miscarriages Computing * Raptor Lake ...

RP-1
RP-1 (alternatively, Rocket Propellant-1 or Refined Petroleum-1) is a highly refined form of kerosene outwardly similar to jet fuel, used as rocket fuel. RP-1 provides a lower specific impulse than liquid hydrogen (LH2), but is cheaper, is stable at room temperature, and presents a lower explosion hazard. RP-1 is far denser than LH2, giving it a higher energy density (though its specific energy is lower). RP-1 also has a fraction of the toxicity and carcinogenic hazards of hydrazine, another room-temperature liquid fuel. Usage and history RP-1 is a fuel in the first-stage boosters of the Electron, Soyuz, Zenit, Delta I-III, Atlas, Falcon, Antares, and Tronador II rockets. It also powered the first stages of the Energia, Titan I, Saturn I and IB, and Saturn V. The Indian Space Research Organization (ISRO) is also developing an RP-1 fueled engine for its future rockets. Development During and immediately after World War II, alcohols (primarily ethanol, occasionally metha ...
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5580 Sharidake
__NOTOC__ Year 558 ( DLVIII) was a common year starting on Tuesday (link will display the full calendar) of the Julian calendar. The denomination 558 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Byzantine Empire * May 7 – In Constantinople, the dome of the Hagia Sophia collapses due to an earthquake. Emperor Justinian I orders the dome to be rebuilt. Europe * The Avars and the Slavs occupy the Hungarian Plain on the Balkans. The threat of Avar domination prompts the Lombards to migrate to Italy. * December 13 – King Chlothar I reunites the Frankish Kingdom after his brother Childebert I dies, becoming sole ruler of the Franks. * December 23 – Chlothar I is crowned King of the Franks. * Conall mac Comgaill becomes king of Dál Riata, a Gaelic overkingdom on the western coast of Scotland. Asia * Istämi, ruler of the Western Turkic K ...
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(12728) 1991 RP1
1 (one, unit, unity) is a number representing a single or the only entity. 1 is also a numerical digit and represents a single unit of counting or measurement. For example, a line segment of ''unit length'' is a line segment of length 1. In conventions of sign where zero is considered neither positive nor negative, 1 is the first and smallest positive integer. It is also sometimes considered the first of the infinite sequence of natural numbers, followed by  2, although by other definitions 1 is the second natural number, following  0. The fundamental mathematical property of 1 is to be a multiplicative identity, meaning that any number multiplied by 1 equals the same number. Most if not all properties of 1 can be deduced from this. In advanced mathematics, a multiplicative identity is often denoted 1, even if it is not a number. 1 is by convention not considered a prime number; this was not universally accepted until the mid-20th century. Additionally, 1 is the s ...
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