64 Angelina is a medium-sized Main belt asteroid and is an uncommon E-type asteroid. It is the third largest E-type after 44 Nysa and 55 Pandora. It was formerly thought to be the largest of this class but recent work[1] has shown that its diameter is only a quarter of what was previously thought. Ernst Wilhelm Leberecht Tempel (December 4, 1821 – March 16, 1889) was a German astronomer who worked in Marseille until the outbreak of the Franco-Prussian War in 1870, then later moved to Italy. ... March 4 is the 63rd day of the year in the Gregorian Calendar (64th in leap years). ... 1861 (MDCCCLXI) was a common year starting on Tuesday (link with display the full calendar) of the Gregorian calendar (or a common year starting on Thursday of the Julian calendar) // January 1 - Benito Juárez captures Mexico City January 2 - Friedrich Wilhelm IV of Prussia dies and is succeeded by... Provisional designation of in astronomy is the naming convention applied to astronomical objects immediately following their discovery. ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... In physics, an orbit is the path that an object makes, around another object, whilst under the influence of a source of centripetal force, such as gravity. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... December 31 is the 365th day of the year (366th in leap years) in the Gregorian Calendar. ... For the Manfred Mann album, see 2006 (album). ... The Julian day or Julian day number (JDN) is the (integer) number of days that have elapsed since Monday, January 1, 4713 BC in the proleptic Julian calendar [1]. That day is counted as Julian day zero. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... The semi-major axis of an ellipse In geometry, the term semi-major axis (also semimajor axis) is used to describe the dimensions of ellipses and hyperbolae. ... Look up giga- in Wiktionary, the free dictionary. ... The metre, or meter (U.S.), is a measure of length. ... The astronomical unit (AU or au or a. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... Water, Rabbit, and Deer: three of the 20 day symbols in the Aztec calendar, from the Aztec Sun Stone. ... In astronomy, a Julian year is a unit of time defined as exactly 365. ... The orbital speed of a body, generally a planet, a natural satellite, an artificial satellite, or a multiple star, is the speed at which it orbits around the barycenter of a system, usually around a more massive body. ... Look up second in Wiktionary, the free dictionary. ... In the study of orbital dynamics the mean anomaly is a measure of time, specific to the orbiting body p, which is a multiple of 2π radians at and only at periapsis. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... A degree (in full, a degree of arc, arc degree, or arcdegree), usually symbolized °, is a measurement of plane angle, representing 1／360 of a full rotation. ... The Longitude of the ascending node () is one of the orbital elements used to specify the orbit of an object in space. ... The argument of the perihelion is one of the orbital elements describing the orbit of a planet. ... Unsolved problems in physics: What causes anything to have mass? Mass is a property of a physical object that quantifies the amount of matter and energy it is equivalent to. ... The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. It was assigned to the United States in 1889 and is periodically recertified and traceable to the primary international standard, The Kilogram, held at the Bureau International des Poids et... In physics, Density is defined as mass m per unit volume V. Mathematically, it is expressed as where, in SI units: ρ (rho) is the density of the substance, measured in kg m-3 m is the mass of the substance, measured in kg v is the volume of the substance... A cubic centimetre (cm3) is an SI derived unit of volume, equal to the volume of a cube with side length of 1 centi metre. ... The surface gravity of a Killing horizon is the acceleration, as exerted at infinity, needed to keep an object at the horizon. ... Space Shuttle Atlantis launches on mission STS-71 In physics, for a given gravitational field and a given position, the escape velocity is the minimum speed an object without propulsion, at that position, needs to have to move away indefinitely from the source of the field, as opposed to falling... In astronomy, a rotation period is the time an astronomical object takes to complete one revolution around its rotation axis. ... Albedo is a ratio of scattered to incident electromagnetic radiation power. ... Fig. ... The Kelvin scale is a thermodynamic (absolute) temperature scale where absolute zero—the lowest possible temperature where nothing could be colder and no heat energy remains in a substance—is defined as zero kelvin (0 K). ... E-type asteroids are inner-belt asteroids that contain enstatite. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us, in the absence of interstellar extinction. ... The asteroid belt is a region of the solar system falling roughly between the planets Mars and Jupiter where the greatest concentration of asteroid orbits can be found. ... 253 Mathilde, a C-type asteroid. ... 44 Nysa (IPA: ) is a quite large and very bright main belt asteroid. ... 55 Pandora is a quite large and very bright Main belt asteroid. ...

It was discovered on March 4, 1861 by a prolific comet discoverer, E. W. Tempel. It was first of his five asteroid discoveries. March 4 is the 63rd day of the year in the Gregorian Calendar (64th in leap years). ... 1861 (MDCCCLXI) was a common year starting on Tuesday (link with display the full calendar) of the Gregorian calendar (or a common year starting on Thursday of the Julian calendar) // January 1 - Benito Juárez captures Mexico City January 2 - Friedrich Wilhelm IV of Prussia dies and is succeeded by... Comet Hale-Bopp Comet McNaught as seen from Swifts Creek, Victoria, Australia on 23 January 2007 A comet is a small body in the solar system that orbits the Sun and (at least occasionally) exhibits a coma (or atmosphere) and/or a tail â€” both primarily from the effects of... Ernst Wilhelm Leberecht Tempel (December 4, 1821 – March 16, 1889) was a German astronomer who worked in Marseille until the outbreak of the Franco-Prussian War in 1870, then later moved to Italy. ...

E-type asteroids show unusual brightening when at close opposition to the Sun. This phenomenon is also known in Jupiter's moons Io, Ganymede and Europa, and also Saturn's moon Iapetus. Adjectives: Jovian Atmosphere Surface pressure: 20–200 kPa[3] (cloud layer) Composition: ~86% H2 ~13% Helium 0. ... Atmospheric characteristics Atmospheric pressure trace Sulfur dioxide 90% Io (eye-oe, IPA: , Greek Ῑώ) is the innermost of the four Galilean moons of Jupiter. ... This article or section does not cite its references or sources. ... Atmospheric characteristics Atmospheric pressure 1 µPa Oxygen 100% Europa (ew-roe-pÉ™, IPA:  ; Greek Ευρώπη) is a moon of the planet Jupiter. ... Iapetus (eye-ap-É™-tÉ™s, IPA , Greek Ιαπετός) is the third-largest moon of Saturn, discovered by Giovanni Domenico Cassini in 1671. ...