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Encyclopedia > (29075) 1950 DA
(29075) 1950 DA   
Discovery
Discovered by: Carl A. Wirtanen
Discovery date: February 23, 1950
Alternative names: 2000 YK66
Minor planet category: Apollo
Orbital characteristics
Epoch March 06, 2006 (JD 2453800.5)
Aphelion distance: 383.148 Gm (2.561 AU)
Perihelion distance: 125.117 Gm (0.836 AU)
Semi-major axis: 254.133 Gm (1.699 AU)
Eccentricity: 0.508
Orbital period: 808.726 d (2.21626 a)
Avg. orbital speed: 21.30 km/s
Mean anomaly: 75.965°
Inclination: 12.184°
Longitude of ascending node: 356.802°
Argument of perihelion: 224.503°
Physical characteristics
Dimensions: 1.1–1.4 km
Mass: >3,000 x 109 kg
Mean density: 3.0 + g/cm³
Equatorial surface gravity: ? m/s²
Escape velocity: ? km/s
Rotation period: 0.0884 d (2.1216 h)
Albedo: 0.2-0.25
Temperature: ? K
Spectral type: E or M
Absolute magnitude: 17.0
Asteroid 1950 DA, radar image
Asteroid 1950 DA, radar image

(29075) 1950 DA is the near Earth object with the highest known possible probability of impacting Earth, according to the Palermo Technical Impact Hazard Scale. For a few days in December 2004 it was temporarily surpassed by 99942 Apophis (which at the time was named only by its provisional designation 2004 MN4). Carl Alvar Wirtanen (1910 – 1990) was an American astronomer who worked at Lick Observatory. ... February 23 is the 54th day of the year in the Gregorian Calendar. ... 1950 (MCML) was a common year starting on Sunday (link will take you to calendar). ... Provisional designation of in astronomy is the naming convention applied to astronomical objects immediately following their discovery. ... The Apollo asteroid 25143 Itokawa. ... 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. ... March 6 is the 65th day of the year in the Gregorian Calendar (66th in Leap years). ... 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? The U.S. National Prototype Kilogram, which currently serves as the primary standard for measuring mass in the U.S. Mass is the 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). ... 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. ... File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ... Near-Earth objects (NEO) are asteroids, comets and large meteoroids whose orbit intersects Earths orbit and which may therefore pose a collision danger. ... Probability is the extent to which something is likely to happen or be the case[1]. Probability theory is used extensively in areas such as statistics, mathematics, science, philosophy to draw conclusions about the likelihood of potential events and the underlying mechanics of complex systems. ... Artists impression of a major impact event. ... Adjectives: Terrestrial, Terran, Telluric, Tellurian, Earthly Atmosphere Surface pressure: 101. ... The Palermo Technical Impact Hazard Scale is a logarithmic scale used by astronomers to rate the potential hazard of impact of a near-earth object. ... 2004 (MMIV) was a leap year starting on Thursday of the Gregorian calendar. ... Close approach of Apophis on April 13, 2029 The white bar indicates uncertainty in the range of positions 99942 Apophis (99942) Apophis (previously known by its provisional designation 2004 MN4) is a near-Earth asteroid that caused a brief period of concern in December 2004 because initial observations indicated a... The provisional designation of comets and asteroids are similar to each other: they both follow a pattern set in 1925 by the Minor Planet Center of the IAU. Historical designations At first, astronomers strove to assign symbols to the minor planets: 1 Ceres a stylized sickle 2 Pallas a lozenge...


1950 DA was first discovered on February 23, 1950 by Carl A. Wirtanen at Lick Observatory. It was observed for 17 days and then lost for half a century. An object discovered on December 31, 2000 (provisionally designated 2000 YK66) was recognized as being the 1950 DA. February 23 is the 54th day of the year in the Gregorian Calendar. ... 1950 (MCML) was a common year starting on Sunday (link will take you to calendar). ... Carl Alvar Wirtanen (1910 – 1990) was an American astronomer who worked at Lick Observatory. ... The Lick Observatory is an astronomical observatory, owned and operated by the University of California. ... December 31 is the 365th day of the year (366th in leap years) in the Gregorian Calendar. ... This article is about the year 2000. ...


The asteroid has been given the number 29075, but does not have a name. Wirtanen had naming rights as the original discoverer. Upon his death, naming rights reverted to the IAU, which may assign a name in the future. Carl Alvar Wirtanen (1910 – 1990) was an American astronomer who worked at Lick Observatory. ... Logo of the IAU The International Astronomical Union (French: Union astronomique internationale) unites national astronomical societies from around the world. ...

Contents

General information

Radar observations at the Goldstone and Arecibo Observatory from March 3 to 7, 2001 during the asteroid's 7.8 million km approach to the Earth give a mean diameter of 1.1 – 1.4 km. Optical lightcurves by Petr Pravec show that the asteroid rotates every 2.1216 hours. The Goldstone Deep Space Communications Complex (GDSCC) —commonly called the Goldstone Observatory— is located in Californias Mojave Desert (USA). ... The Arecibo Observatory is located approximately 9 miles south-southwest from Arecibo, Puerto Rico (near the extreme southwestern corner of Arecibo pueblo). ... March 3 is the 62nd day of the year in the Gregorian Calendar (63rd in leap years). ... March 7 is the 66th day of the year in the Gregorian Calendar (67th in leap years). ... 2001 (MMI) was a common year starting on Monday of the Gregorian calendar. ... Petr Pravec is a Czech astronomer. ...


Due to its short rotation period, 1950 DA is thought to be fairly dense (more than 3.0 g/cm³).


If 1950 DA continues on its present orbit, it will approach near to the Earth on March 16, 2880. Over the intervening time, the rotation of the asteroid will cause its orbit to change (by the Yarkovsky effect). A preliminary analysis shows two possible pole directions[1]. One trajectory misses the Earth by tens of millions of kilometers, while the other has an impact probability of 1300. The radar observations are currently being reanalyzed, in combination with the optical lightcurves. March 16 is the 75th day of the year in the Gregorian Calendar (76th in leap years). ... (Redirected from 2880) (28th century - 29th century - 30th century - more centuries) The 29th century (Gregorian Calendar) comprises the years 2801-2900. ... In physics, the Yarkovsky effect is a force felt by a body caused by the momentum carried away by the thermal photons that it emits. ...


The energy released by a collision with an object the size of 1950 DA would cause major effects on the climate and biosphere which would be devastating to human civilization. The Global Biosphere:a false-color composite of CZCS images of plankton concentrations with land vegetation data collected by the Advanced Very High Resolution Radiometer instrument. ... Trinomial name Homo sapiens sapiens Linnaeus, 1758 Humans, or human beings, are bipedal primates belonging to the mammalian species Homo sapiens (Latin: wise man or knowing man) under the family Hominidae (the great apes). ... Cities are a major hallmark of human civilization. ...


The discovery of the potential impact has heightened interest in asteroid deflection strategies. Artists impression of a major impact event. ...


See also

The following is a list of noteworthy asteroids in our Solar system. ... The Torino Scale is a method for categorizing the impact hazard associated with near-Earth objects (NEOs) such as asteroids and comets. ... The Palermo Technical Impact Hazard Scale is a logarithmic scale used by astronomers to rate the potential hazard of impact of a near-earth object. ...

References

  1. ^ Giorgini, et al. (2002), Asteroid 1950 DA's 2880 Encounter with Earth: Physical Limits of Collision Probability Prediction, Science, Vol. 296. no. 5565, pp. 132 - 136

External links

Minor planets
Previous minor planet (29075) 1950 DA Next minor planet
List of asteroids

  Results from FactBites:
 
Asteroid 1950 DA (1627 words)
Asteroid 1950 DA Asteroid 1950 DA Arecibo radar image of 1950 DA on 4 March 2001, from a distance of 0.052 AU.
If it is eventually decided 1950 DA needs to be diverted, the hundreds of years of warning could allow a method as simple as dusting the surface of the asteroid with chalk or charcoal, or perhaps white glass beads, or sending a solar sail spacecraft that ends by collapsing its reflective sail around the asteroid.
Initial 1950 DA results were first reported at the "Asteroids 2001: from Piazzi to the 3rd Millennium" conference in Palermo, Sicily June 11-16: J.D. Giorgini et al., "Asteroid 1950 DA: Long Term Prediction of its Earth Close Approaches" Asteroids 2001, Palermo, Italy, June 2001.
29075 1950 DA (886 words)
If future generations' studies of 1950 DA indicate it ought to be diverted to prevent a collision, the subtle influences that its physical properties have on its motion might be manipulated to advantage.
Images of 29075 1950 DA Arecibo radar image of 1950 DA on 4 March 2001, from a distance of 0.052 AU (22 lunar distances).
Arecibo radar images of asteroid 1950 DA obtained during 48 minutes (37% of a rotation) on March 4, 2001.
  More results at FactBites »

 
 

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