(357439) 2004 BL86
 2004 BL86 i jej księżyc (złożenie obrazów z radaru Goldstone) | |
| Odkrywca | |
|---|---|
| Data odkrycia | 30 stycznia 2004 |
| Numer kolejny | 357439 |
| Charakterystyka orbity (J2000) | |
| Przynależność obiektu | |
| Półoś wielka | |
| Mimośród | 0,4027[2] |
| Peryhelium | |
| Aphelium | |
| Okres obiegu wokół Słońca | 1,84[2] lat |
| Inklinacja | 23,78[2]° |
| Charakterystyka fizyczna | |
| Średnica | 0,325[3] km |
| Okres obrotu | |
| Jasność absolutna | |
| Satelity naturalne | 1[3] |
(357439) 2004 BL86 – planetoida z grupy Apollo, przelatująca blisko Ziemi. Odkryta 30 stycznia 2004 w projekcie LINEAR[1], przeleciała w pobliżu Ziemi 26 stycznia 2015 o godz. 16:20 UT w odległości 3,1 LD[4][2].
Zbliżenie do Ziemi
W dniach 26–27 stycznia 2015 planetoida na krótko pojawiła się z jasnością 9m w pobliżu równika niebieskiego[5]. Była słabo widzialna i bez dobrego sprzętu obserwatorskiego można było ją pomylić z szybko poruszającymi się satelitami[4]. W pobliżu punktu największego zbliżenia planetoida poruszała się z prędkością około 2,5 stopnia na godzinę (2,5 sekund kątowych na sekundę)[5][6]. 27 stycznia 2015 o 04:37 czasu uniwersalnego przeszła do opozycji względem Słońca[5]. Ok. 5:00 znalazła się w pobliżu gromady Żłóbek[6].
26 stycznia 2015 znalazła się najbliżej Ziemi na kolejne 200 lat[2][4] i była najbliższym obiektem o takim rozmiarze przechodzącym w pobliżu Ziemi (następnym będzie planetoida (137108) 1999 AN10, która zbliży się na odległość porównywalną z odległością Księżyca od Ziemi w 2027)[7].
Obserwatorium Goldstone wykryło, że 2004 BL86 posiada księżyc o średnicy ok. 70 m[3].
Galeria
Asteroida 2004 BL86 bezpiecznie mija Ziemię 26 stycznia 2015
Trajektoria 2004 BL86 podczas zbliżenia się do Ziemi
(c) Kevin Heider, CC BY-SA 3.0Ślad 2004 BL86 (po lewej) w pobliżu Azmidiske
Przypisy
- ↑ a b MPEC 2004-B80 : 2004 BL86 (ang.). IAU Minor Planet Center, 31 stycznia 2004. [dostęp 2015-01-28].
- ↑ a b c d e f g h i j k 357439 (2004 BL86) w bazie Jet Propulsion Laboratory (ang.). [dostęp 2018-05-01].
- ↑ a b c Asteroid That Flew Past Earth Today Has Moon (ang.). W: NASA [on-line]. 26 stycznia 2015. [dostęp 2015-01-28].
- ↑ a b c Asteroid to Fly By Earth Safely on 26 January 2015 (ang.). W: NASA [on-line]. 13 stycznia 2015. [dostęp 2015-01-28].
- ↑ a b c (357439) 2004BL86 Ephemerides for 25 January 2015 through 29 January 2015 (ang.). NEODyS (Near Earth Objects – Dynamic Site). [zarchiwizowane z tego adresu (2016-03-08)].
- ↑ a b Alan MacRobert: Mountain-size Asteroid Glides Past Earth (ang.). W: Sky & Telescope [on-line]. 22 stycznia 2015. [dostęp 2015-01-28].
- ↑ Dr. Lance A. M. Benner: Goldstone Radar Observations Planning: (357439) 2004 BL86 (ang.). NASA/JPL Asteroid Radar Research. [dostęp 2015-01-28].
Linki zewnętrzne
- (357439) 2004 BL86 w bazie Minor Planet Center (ang.)
Media użyte na tej stronie
Scientists working with NASA's 230-foot-wide (70-meter) Deep Space Network antenna at Goldstone, California, have released the first radar images of asteroid 2004 BL86. The images show the asteroid, which made its closest approach today (Jan. 26, 2015) at 8:19 a.m. PST (11:19 a.m. EST) at a distance of about 745,000 miles (1.2 million kilometers, or 3.1 times the distance from Earth to the moon), has its own small moon.
The 20 individual images used in the movie were generated from data collected at Goldstone on Jan. 26, 2015. They show the primary body is approximately 1,100 feet (325 meters) across and has a small moon approximately 230 feet (70 meters) across. In the near-Earth population, about 16 percent of asteroids that are about 655 feet (200 meters) or larger are a binary (the primary asteroid with a smaller asteroid moon orbiting it) or even triple systems (two moons). The resolution on the radar images is 13 feet (4 meters) per pixel.
The trajectory of asteroid 2004 BL86 is well understood. Monday's flyby was the closest approach the asteroid will make to Earth for at least the next two centuries. It is also the closest a known asteroid this size will come to Earth until asteroid 1999 AN10 flies past our planet in 2027.
Asteroid 2004 BL86 was discovered on Jan. 30, 2004, by the Lincoln Near-Earth Asteroid Research (LINEAR) survey in White Sands, New Mexico.
Updated Charts for Asteroid 2004 BL86 Earth Flyby on Jan 26, 2015 - This diagram shows the close passage of 2004 BL86 on January 26, 2015. The view is nearly edge-on to the Earth's orbit; the Moon's nearly circular orbit is highly foreshortened from this viewpoint. The asteroid moves from the south to the north, from below the Earth's orbit to above. The indicated times are Universal Time. Closest approach occurs at about 16:19 UTC, or about 11:19 EST. The roughly 500-meter (1500-foot) asteroid approaches to within 1.2 million kilometers (750,000 miles) of Earth, or about 3.1 times the distance of the Moon.
(c) Kevin Heider, CC BY-SA 3.0
90 second exposure of Near-Earth asteroid 2004 BL86 with a 80mm refractor and a Canon T3i at prime focus. The image was taken at 2015-01-26 2:43AM PST (10:43 UT) from Blue Canyon, CA as the asteroid passed 3rd magnitude Xi Puppis. Since the stars are being tracked the asteroid left a star trail on the left hand side. The asteroid was about 11 degrees above the horizon and the clouds were rolling in. The asteroid was travelling upward in the image.
News - January 13, 2015
Asteroid to Fly By Earth Safely on January 26, 2015
http://www.jpl.nasa.gov/news/news.php?release=2015-015
This graphic depicts the passage of asteroid 2004 BL86, which will come no closer than about three times the distance from Earth to the moon on Jan. 26, 2015. Due to its orbit around the sun, the asteroid is currently only visible by astronomers with large telescopes who are located in the southern hemisphere. But by Jan. 26, the space rock's changing position will make it visible to those in the northern hemisphere.
An asteroid, designated 2004 BL86, will safely pass about three times the distance of Earth to the moon on January 26. From its reflected brightness, astronomers estimate that the asteroid is about a third of a mile (0.5 kilometers) in size. The flyby of 2004 BL86 will be the closest by any known space rock this large until asteroid 1999 AN10 flies past Earth in 2027.
At the time of its closest approach on January 26, the asteroid will be approximately 745,000 miles (1.2 million kilometers) from Earth.
"Monday, January 26 will be the closest asteroid 2004 BL86 will get to Earth for at least the next 200 years," said Don Yeomans, who is retiring as manager of NASA's Near Earth Object Program Office at the Jet Propulsion Laboratory in Pasadena, California, after 16 years in the position. "And while it poses no threat to Earth for the foreseeable future, it's a relatively close approach by a relatively large asteroid, so it provides us a unique opportunity to observe and learn more."
One way NASA scientists plan to learn more about 2004 BL86 is to observe it with microwaves (http://www.jpl.nasa.gov/news/news.php?release=2006-00a ). NASA's Deep Space Network antenna at Goldstone, California, and the Arecibo Observatory in Puerto Rico will attempt to acquire science data and radar-generated images of the asteroid during the days surrounding its closest approach to Earth.
"When we get our radar data back the day after the flyby, we will have the first detailed images," said radar astronomer Lance Benner of JPL, the principal investigator for the Goldstone radar observations of the asteroid. "At present, we know almost nothing about the asteroid, so there are bound to be surprises."
Asteroid 2004 BL86 was initially discovered on Jan. 30, 2004 by a telescope of the Lincoln Near-Earth Asteroid Research (LINEAR) survey in White Sands, New Mexico.
The asteroid is expected to be observable to amateur astronomers with small telescopes and strong binoculars.
"I may grab my favorite binoculars and give it a shot myself," said Yeomans. "Asteroids are something special. Not only did asteroids provide Earth with the building blocks of life and much of its water, but in the future, they will become valuable resources for mineral ores and other vital natural resources. They will also become the fueling stops for humanity as we continue to explore our solar system. There is something about asteroids that makes me want to look up."
NASA's Near-Earth Object Program Office is experiencing its first transition in leadership since it was formed almost 17 years ago. On Jan. 9, after a 39-year-long career at JPL, Yeomans retired. Paul Chodas, a long-time member of Yeomans' team at JPL, has been designated as the new manager.
NASA detects, tracks and characterizes asteroids and comets using both ground- and space-based telescopes. Elements of the Near-Earth Object Program, often referred to as "Spaceguard," discover these objects, characterize a subset of them and identify their close approaches to determine if any could be potentially hazardous to our planet.
JPL manages the Near-Earth Object Program Office for NASA's Science Mission Directorate in Washington. JPL is a division of the California Institute of Technology in Pasadena.
More information about asteroids and near-Earth objects is at:
http://www.jpl.nasa.gov/asteroidwatch.
To get updates on passing space rocks, follow:
https://twitter.com/asteroidwatch