请输入您要查询的百科知识：

　

词条 Fine Guidance Sensor (HST)
释义

  1. Observations

  2. See also

  3. References

  4. External links

Fine Guidance Sensor (FGS) for the Hubble Space Telescope is a system of three instruments used for pointing the telescope in space, and also for astrometry and its related sciences.[2] Each FGS uses a combination of optics and electronics to provide for pointing the telescope at a certain location in the sky.[2] There are three Hubble FGS, and they have been upgraded over the lifetime of the telescope by manned Space Shuttle missions.[3] The instruments can support pointing of 2 milli-arc seconds (units of degree).[4] The three FGS are part of the Hubble Space Telescope's Pointing Control System, aka PCS.[5] The FGS function in combination with the Hubble main computer and gyroscopes, with the FGS providing data to the computer as sensors which enables the HST to track astronomical targets.[6]

The FGS can be used to locate something in space, and then lock-on to it.[7] It can provide the movements the telescope must make to keep the object in view, for the main instruments to record data on.[8]

The FGS were originally made by the optics company Perkin-Elmer, and as removable and repairable instruments it has been possible to refurbish them over the lifetime of the telescope.[8] The first replacement FGS was installed in 1997, swapping out FGS1.[5]

In May 2009, on STS-125 a FGS was replaced during the mission to the Hubble telescope by the Space Shuttle.[9] The astronaut crew performed an EVA (spacewalk) to service the FGS and other components on the telescope in Earth orbit.[9] This was the SM4 mission.[6]

An example of astrometry science with the Hubble FGS system is observations of the Low-Mass Binary star system L722-22.[10] Observations were taken of the system in 1990s, and the data helped determine the mass of each of the components of L722-22, which is also known as LHS 1047 and GJ 1005.[10]

The FGS are white-light shearing interferometers.[5] The FGS weigh 220 kg (485 lb) and have dimensions of roughly 0.5 m × 1.0 m × 1.6 meters.[11]

Observations

The smallest KBO yet detected at that time was discovered in 2009 by poring over data from the Hubble Space Telescope's fine guidance sensors.[12] They detected a transit of an object against a distant star, which, based on the duration and amount of dimming, was calculated to be a KBO about {{convert|3200|ft|m|sigfig=1|order=flip|sp=us}} in diameter.[12] It has been suggested that the Kepler observatory may be able to detect objects in the Oort cloud by their occultation of background stars,[13] and the Whipple proposal would also try to use this concept

A Hubble FGS has also been used for astrometry, tracking the movement of different starts.[14] This ability was used for exoplanet research, where the motion of the star caused by the movement of planets around it was detected.[15] Hubble was used via the FGS sensors to detect the motion of star caused by an exoplanet orbiting it.[16] The effect on the Star Gliese 876's by companion Gliese 876b was measured.[17] That star is known as a red dwarf about 15 light-years away from Earth.[18]

FGS was used to study Double-star systems (aka Binary star systems) and to measure distances to astronomical bodies.[19]

FGS has also been used to observer asteroids and calculate their size.[20] Asteroids studied include (63) Ausonia, (15) Eunomia, (43) Ariadne, (44) Nysa, and (624) Hektor.[21]

See also

  • Fine Guidance Sensor and Near Infrared Imager and Slitless Spectrograph (FGS for JWST)
  • Guide Star Catalog (Hubble)
  • Whipple (spacecraft) (Occulation type Space telescope concept)
  • Kepler (spacecraft) (Space telescope)
  • Fine guidance sensor

References

1. ^[https://www.webcitation.org/6BO1Bx7sb]
2. ^1 {{Cite web|url=https://www.spacetelescope.org/about/general/instruments/fgs/|title=Hubble's Instruments: FGS - Fine Guidance Sensors|last=information@eso.org|website=www.spacetelescope.org|language=en|access-date=2017-03-03}}
3. ^{{Cite web|url=https://www.nasa.gov/mission_pages/hubble/servicing/SM4/multimedia/FGS_practice_mm.html|title=NASA - Refurbished Fine Guidance Sensor (FGS)|website=www.nasa.gov|language=en|access-date=2017-03-03}}
4. ^Fine Guidance Sensors Aboard the Hubble Space Telescope, the Scientific Capabilities of these Interferometer
5. ^1 2  
6. ^1 {{Cite web|url=https://www.nasa.gov/mission_pages/hubble/servicing/SM4/main/FGS_FS_HTML.html|title=NASA - Hubble Space Telescope Servicing Mission 4
Fine Guidance Sensor|website=www.nasa.gov|language=en|access-date=2017-03-03}}
7. ^{{Cite news|url=http://www.newstimes.com/news/article/Fine-guidance-sensors-Hubble-s-unsung-heros-454038.php|title=Fine guidance sensors: Hubble's unsung heros|work=NewsTimes|access-date=2017-04-12}}
8. ^1 {{Cite news|url=http://www.newstimes.com/news/article/Fine-guidance-sensors-Hubble-s-unsung-heros-454038.php|title=Fine guidance sensors: Hubble's unsung heros|work=NewsTimes|access-date=2017-03-03}}
9. ^1 {{Cite web|url=https://spaceflight.nasa.gov/gallery/images/shuttle/sts-125/html/s125e009890.html|title=Photo Index 1|website=spaceflight.nasa.gov|access-date=2017-03-03}}
10. ^1 {{Cite journal|last=Hershey|first=John L.|last2=Taff|first2=L. G.|date=1998-01-01|title=Hubble Space Telescope Fine Guidance Sensor Astrometry of the Low-Mass Binary L722-22|url=http://stacks.iop.org/1538-3881/116/i=3/a=1440|journal=The Astronomical Journal|language=en|volume=116|issue=3|pages=1440|doi=10.1086/300516|issn=1538-3881|bibcode=1998AJ....116.1440H}}
11. ^{{Cite web|url=http://sci.esa.int/hubble/34007-hubble-instruments/?fbodylongid=1461|title=Hubble instruments|website=sci.esa.int|language=en-GB|access-date=2017-03-03}}
12. ^1  
13. ^[https://arxiv.org/pdf/0912.0948.pdf DETECTABILITY OF OORT CLOUD OBJECTS USING KEPLER - 2009]
14. ^{{Cite news|url=https://news.utexas.edu/2010/05/24/mcdonald_planetary_system|title="Out of Whack" Planetary System Offers Clues to a Disturbing Past|date=2010-05-24|work=UT News {{!}} The University of Texas at Austin|access-date=2018-01-28|language=en}}
15. ^{{Cite news|url=https://news.utexas.edu/2010/05/24/mcdonald_planetary_system|title="Out of Whack" Planetary System Offers Clues to a Disturbing Past|date=2010-05-24|work=UT News {{!}} The University of Texas at Austin|access-date=2018-01-28|language=en}}
16. ^[https://www.nasa.gov/content/hubble-space-telescope-fine-guidance-sensors]
17. ^[https://www.nasa.gov/content/hubble-space-telescope-fine-guidance-sensors]
18. ^Gliese 876
19. ^[https://www.nasa.gov/content/hubble-space-telescope-fine-guidance-sensors]
20. ^{{Cite journal|last=Tanga|first=P.|last2=Hestroffer|first2=D.|last3=Cellino|first3=A.|last4=Lattanzi|first4=M.|last5=Martino|first5=M. Di|last6=Zappalà|first6=V.|date=2003-04-01|title=Asteroid observations with the Hubble Space Telescope FGS|url=https://www.aanda.org/articles/aa/abs/2003/14/aa3023/aa3023.html|journal=Astronomy & Astrophysics|language=en|volume=401|issue=2|pages=733–741|doi=10.1051/0004-6361:20030032|issn=0004-6361|via=|bibcode=2003A&A...401..733T}}
21. ^{{Cite journal|last=Tanga|first=P.|last2=Hestroffer|first2=D.|last3=Cellino|first3=A.|last4=Lattanzi|first4=M.|last5=Martino|first5=M. Di|last6=Zappalà|first6=V.|date=2003-04-01|title=Asteroid observations with the Hubble Space Telescope FGS|url=https://www.aanda.org/articles/aa/abs/2003/14/aa3023/aa3023.html|journal=Astronomy & Astrophysics|language=en|volume=401|issue=2|pages=733–741|doi=10.1051/0004-6361:20030032|issn=0004-6361|via=|bibcode=2003A&A...401..733T}}

External links

  • Fine Guidance Sensors Aboard the Hubble Space Telescope, the Scientific Capabilities of these Interferometer
  • [https://www.nasa.gov/mission_pages/hubble/servicing/SM4/main/FGS_FS_HTML.html NASA Fact Sheet Hubble FGS]
  • A DECONVOLUTION TECHNIQUE FOR HUBBLE SPACE TELESCOPE FGS FRINGE ANALYSIS
  • Hubblesite - FGS
{{Hubble Space Telescope}}

2 : Hubble Space Telescope instruments|Space astrometry missions
随便看

　

开放百科全书收录14589846条英语、德语、日语等多语种百科知识，基本涵盖了大多数领域的百科知识，是一部内容自由、开放的电子版国际百科全书。

　

Copyright © 2023 OENC.NET All Rights Reserved
京ICP备2021023879号 更新时间：2024/11/11 23:20:32