NEAR, seyir aşamasının çoğunu, 61 km çapındaki asteroit 253 Mathilde'nin geçişinden birkaç gün önce sona eren, minimal etkinlik "kış uykusu" durumunda geçirdi .
asteroid 433 Eros.
The Small-Body Grand Tour was a plan for visiting two asteroids and two comets over a span of a decade with the spacecraft..
colors and to search for any small moons of Mathilde. Derin Uzay Ağında bir anten süresinin uzatılmasını aldıktan sonra , uzay aracının gama ışını spektrometresi, Eros'un bileşimi hakkında, yüzeyden on kat daha hassas olduğu yüzeyden yaklaşık 4 inç (100 mm) bir görüş noktasından veri toplamak üzere yeniden programlandı. NASA's Discovery missions and the first mission ever to go into orbit Images of Eros were taken by the camera, data were collected by the near IR spectrograph, and radio tracking was performed during the flyby.
Attitude control was achieved using the hydrazine thrusters and four reaction wheels. Tutum kontrolü 0.1 dereceye kadardı, görüş hattı işaret kararlılığı bir saniyede 50 mikroradyan içindeydi ve işlem sonrası tutum bilgisi 50 mikroradyan içindir. In the final moments before it landed on Feb 12, 2001, One of the images from the flyby of 253 Mathilde.
fitted with a CCD imaging detector, a laser altimeter, and a magnetometer. Mathilde at a distance of 1,200 km and found it to be composed of extremely Başlangıçta yörünge 200 km yarıçaplı daireseldi.
Discovery programının ilk görevi; Dünya'ya yakın asteroid 433 Eros'un yörünge keşfi.
The Earth gravity assist swingby occurred on January 23, 1998 at 7:23 UT. The spacecraft then made a slow controlled descent to the surface of Eros ending with a touchdown just to the south of the saddle-shaped feature Himeros on February 12, 2001 at approximately 20:01 UT (3:01 p.m. EST).
NEAR spent most of the cruise phase in a minimal activity "hibernation" state, which ended a few days before the flyby of the 61 km diameter asteroid 253 Mathilde.
The orbit was slowly decreased to a 35 km circular polar orbit by July 14. A windows (pop-into) of information (full-content of Sensagent) triggered by double-clicking any word on your webpage.
Change the target language to find translations. Duyarlılıktaki bu artış, kısmen, sondanın kendisi tarafından üretilen gürültüye kıyasla Eros'tan gelen sinyalin artan oranından kaynaklanıyordu. The Near mission was roughly five years from launch (February 17, 1996) until the end of the extended mission on the surface of Eros (February 28, 2001).
Between December 1999 and February 2001 NEAR Shoemaker used its gamma ray spectrometer to detect gamma ray bursts as part of the InterPlanetary Network.. surface of the asteroid. The spacecraft impacted at a velocity of about 1.5 to 1.8 meters/second To accomplish these goals, the spacecraft was equipped with an X-ray/gamma ray spectrometer, a near-infrared imaging spectrograph, a multi-spectral camera fitted with a CCD imaging detector, a laser rangefinder, and a magnetometer.
Attitude control was to 0.1 degree, line-of-sight pointing stability is within 50 microradians over one second, and post-processing attitude knowledge is to 50 microradians. Diğer kullanımlar için bkz. A deep-space maneuver in Jul 1997 brought the probe back around Earth on 31 January NASA Press Release.
Following the flyby NEAR moved to a 200 km circular orbit and shifted the orbit from prograde near-polar to a retrograde near-equatorial orbit.
One recorder has 1.1 gigabits of storage, the other has 0.67 gigabits.
NEAR entered an orbit of 323 × 370 km around Eros on Feb 14, 2000, Get XML access to reach the best products. Görev, 12 Şubat 2001'de Eros'un "eyer" bölgesinde bir konma ile sona erdi.
Attitude control was to 0.1 degree, line-of-sight pointing stability is within 50 microradians over one second, and post-processing attitude knowledge is to 50 microradians. Diagram showing location of NEAR science instruments.
probe touched down so smoothly that its radio beacon continued to send out Boggle gives you 3 minutes to find as many words (3 letters or more) as you can in a grid of 16 letters.
Orbital yerleştirmede ilk denemede başarısızlık, "Asteroid 433 Eros'un temel bileşimi: NEAR-Shoemaker x-ışını spektrometresinin sonuçları", "NEAR-Shoemaker Lazer Telemetre'den 433 Eros'un şekli", NSSDC Ana Katalog: Uzay Aracı - NEAR Shoemaker, NASA GSFC: NEAR Shoemaker, Near Earth Asteroid Rendezvous, Resmi NEAR Görev Sitesi (Johns Hopkins Uygulamalı Fizik Laboratuvarı), Creative Commons Attribution-ShareAlike Lisansı, Creative Commons Attribution-ShareAlike 3.0 Unported License, This page is based on the copyrighted Wikipedia article. Once this connection is established, meteorite material can be studied with large, complex, and evolving equipment, and the results extrapolated to bodies in space.
Lettris is a curious tetris-clone game where all the bricks have the same square shape but different content. The propulsion system carried 209 kg of hydrazine and 109 kg of NTO oxidizer in two oxidizer and three fuel tanks. , At 7 p.m. EST on February 28, 2001 the last data signals were received from NEAR Shoemaker before it was shut down.
Maneuvers in mid-October led to a flyby of Eros within 5.3 km of the surface at 07:00 UT on 26 October. The mission ended with a touchdown in the "saddle" region of Eros on February 12, 2001.
The NEAR Shoemaker spacecraft took the image from about 50 km (30 miles) above the asteroid's surface.
Images of Eros were taken by the camera, data was collected by the near IR spectrograph, and radio tracking was performed during the flyby. (20:01:52 UT) Monday, 12 February and contact has been maintained. It completed its mission on February 28th, 2001, when it returned the last of its gamma-ray spectrometer data.
an octagonal prism, approximately 1.7 m on a side, with four solar panels Küçük Vücut Büyük Turu, uzay aracı ile on yıl boyunca iki asteroidi ve iki kuyruklu yıldızı ziyaret etmek için bir plandı.
However, it is undeniable that NEAR data advanced the field of asteroidal studies tremendously. Vikipedi, özgür ansiklopedi.
The total mass of the instruments was 56 kg, and they required 80 W power.
See the Information on the NEAR Mission Trajectory One of the images from the flyby of 253 Mathilde. Misyonun birincil amacı, yaklaşık bir yıl boyunca yörüngeden Dünya'ya yakın asteroid 433 Eros'u incelemekti . asteroid about 13 x 13 x 33 km in size.
Searches for satellites of Eros took place on January 28, and 4 and 9 February, none were found. The spacecraft subsequently entered safe mode and began tumbling. The primary goal of the mission was to study the near-Earth asteroid 433 Eros from orbit for approximately one year.
A new plan was put into effect in which NEAR flew by Eros on December 23, 1998 at 18:41:23 UT at a speed of 965 m/s and a distance of 3827 km from the center of mass of Eros.
After launch on a Delta 7925-8 (a Delta II launch vehicle with nine strap-on solid-rocket boosters and a Star 48 (PAM-D) third stage) and exit from Earth orbit, NEAR entered the first part of its cruise phase. Contact between the spacecraft and mission control could not be established for over 24 hours.
A radio science experiment was also performed using the NEAR tracking system to estimate the gravity field of the asteroid. Eros, yaklaşık 13 × 13 × 33 km boyutunda S-tipi bir asteroittir ve Dünya'ya yakın ikinci en büyük asteroittir. The command and data handling subsystem was composed of two redundant command and telemetry processors and solid state recorders, a power switching unit, and an interface to two redundant 1553 standard data buses for communications with other subsystems. NEAR MSI-NIS instrument information - Cornell University The Near Earth Asteroid Rendezvous (NEAR) Shoemaker spacecraft being assembled. Announcing our NEW encyclopedia for Kids! Information on Comet Hyakutake
The spacecraft apparently came to rest with the camera and gamma-ray spectrometer pointing Uzay aracının iticileri , anormallik sırasında binlerce kez ateş açtı ve programın itici marjını sıfıra indiren 29 kg itici gaz harcadı.
), http://nssdc.gsfc.nasa.gov/planetary/mission/near/near_mathilde.html, "Estimating the mass of asteroid 253 Mathilde from tracking data during the NEAR flyby", http://www.sciencemag.org/cgi/content/full/278/5346/2106, "The NEAR Rendezvous Burn Anomaly of December 1998", http://klabs.org/richcontent/Reports/Failure_Reports/NEAR_Rendezvous_Burn.pdf, "The End of an Asteroidal Adventure: NEAR Shoemaker Phones Home for the Last Time", http://near.jhuapl.edu/news/flash/01feb28.html, http://near.jhuapl.edu/news/flash/02dec12_1.html, NSSDC Master Catalog: Spacecraft - NEAR Shoemaker, NASA JPL: NEAR Shoemaker, Near Earth Asteroid Rendezvous, Official NEAR Mission Site (Johns Hopkins Applied Physics Laboratory), http://en.wikipedia.org/w/index.php?title=NEAR_Shoemaker&oldid=490320079, Launch date/time: 1996-02-17 at 20:43:27 UTC.
The mission succeeded in closing in with the asteroid and orbited it several times, finally terminating by touching down on the asteroid on 12 February 2001. Zuber MT, Smith DE, Cheng AF, Garvin JB, Aharonson O, Cole TD, Dunn PJ, Guo YP, Lemoine FG, Neumann GA, Rowlands DD, Torrence MH (2000). , At 7 p.m. EST on February 28, 2001 the last data signals were received from NEAR Shoemaker before it was shut down.
All rights reserved. Near Earth Asteroid Rendezvous Shoemaker (NEAR Shoemaker), first spacecraft to orbit and then land on an asteroid (Eros, a near-Earth asteroid, on Feb. 12, 2001). The Near Earth Asteroid Rendezvous – Shoemaker (NEAR Shoemaker), renamed after its 1996 launch in honor of planetary scientist Eugene Shoemaker, was a robotic space probe designed by the Johns Hopkins University Applied Physics Laboratory for NASA to study the near-Earth asteroid Eros from close orbit over a period of a year.
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