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Long Range Reconnaissance Imager

LORRI captured this panchromatic greyscale image of Pluto on July 13, 2015 when still almost half a million miles away from the icy dwarf planet.

Long Range Reconnaissance Imager (LORRI) is a telescope aboard the New Horizons spacecraft for imaging.[1] LORRI has been used to image Jupiter, its moons, Pluto and its moons, and Arrokoth since its launch in 2006.[2][3] LORRI is a reflecting telescope of Ritchey-Chrétien design, and it has a main mirror diameter of 208 mm (8.2 inches) across.[4][5] LORRI has a narrow field of view, less than a third of a degree.[4] Images are taken with a CCD capturing data with 1024 × 1024 pixels.[4] LORRI is a telescopic panchromatic camera integrated with the New Horizons spacecraft, and it is one of seven major science instruments on the probe.[5] LORRI does not have any moving parts and is pointed by moving the entire New Horizons spacecraft.[5]

Operations

First image of Arrokoth by New Horizons, taken on 16 August 2018 with LORRI. Left: Raw image includes background stars. Right: After being processed for background star subtraction.
Long distance imaging (animated) of 50000 Quaoar

LORRI was used to calculate albedos for Pluto and Charon.[6] LORRI is also used for navigation, especially to more precisely determine the location of a flyby target.[7] In 2018, New Horizons spacecraft used navigation data from LORRI for its planned flyby of Arrokoth in a couple months.[8]

During the cruise to Jupiter, LORRI data was also used to determine a value for the cosmic optical background as an alternative to other methods.[9] At Jupiter, LORRI was used for an extensive observation campaign of Jupiter's atmosphere, rings, and moons.[4]

On August 29, 2006, the cover on LORRI was opened and it took an image in space of Messier 7 (aka Ptolemy’s Cluster) for its first light image.[10] The following year, in 2007 when it flew by Jupiter for its gravity assist, it was used to image Jupiter and its moons.[11] LORRI also imaged the Jovian system in 2010 as part of an annual checkout confirming the operation of LORRI, taking pictures from a distance of about 16 AU.[11]

In 2015, LORRI was used to image Pluto before and during the flyby.[12] In December 2017, LORRI took an image at a greater distance from Earth than Pale Blue Dot by Voyager 1, in this case of the Wishing Well Cluster.[13] This cluster was also the first light image for the Wide Field and Planetary Camera of the Hubble Space Telescope, taken in May 1990.[14]

This LORRI image, taken on December 5, 2017, broke the record for an image taken at the greatest distance from Earth, surpassing Pale Blue Dot taken on February 14, 1990, by Voyager 1.[13]

In August 2018, LORRI was able to detect Arrokoth at distance of around 161 million kilometres (100 million miles).[15]

A large stack of images of Arrokoth from August to December 2018 was used to confirm a closer flyby, rather than more distant by ruling out moons and rings systems to a certain level of detection.[16]

On the night of December 24, 2018 LORRI was used to take images of Arrokoth at a distance of 10 million kilometres (6.2 million miles).[17] Three images were taken each with a half second long exposure, at a 1024x1024 pixel resolution.[17][18]

Specifications

LORRI being installed on the spacecraft in 2004.[19]

LORRI is a reflective telescope integrated with the New Horizons spacecraft. It can take greyscale images of astronomical targets.[4]

Specifications:[5][4]

  • Telescope style: Ritchey-Chrétien
  • Aperture: 208 mm (8.2 inches)
  • Mass: 8.8 kilograms (19.4 pounds)
  • Average electrical power use: 5.8 watts
  • Field of View: 0.29 degrees
  • Resolution: 4.95 μrad pixels[4]
  • Bandpass: from about 350 nm to 850 nm[4]
  • Operating temperature: 148K to 313K[20]
  • Sensor: E2V Technologies CCD47-20 and Analog Devices AD9807 ADC[21][22]
    • Frame-Transfer Back-Illuminated CCD
    • Size: 13.3×13.3 mm
    • Pixel size: 13×13 μm native size with 4×4 pixel on-chip binning possible
    • 1024×1024 active pixels
    • 12 bits ADC

The mirror is made of silicon carbide which helped support meeting the thermal requirements of the design.[20]

The instrument is a thinned backside-illuminated charge-coupled device, and captures images at a resolution of 1024 by 1024 pixels, with a variety of exposure settings.[4] LORRI can take one picture per second and store the picture digitally as a 12-bit image, with either lossless or lossy compression.[4] (See also Data compression)

LORRI incorporates a field-flattening lens with three elements.[21]

The design can take images at very low light levels required for the mission, including light levels 1/900 those of Earth when it is at Pluto.[4] For the Arrokoth encounter the longest exposure time (up to ten seconds for the Pluto flyby) was increased.[23] This was accomplished after the Pluto flyby by the team, to support taking images in even lower light levels.[24]

After the Pluto flyby, exposure times of at least 30 seconds were made possible, which was also useful for taking reconnaissance images and enabling imaging down to a magnitude of 21.[25]

LORRI is pointed by moving the entire spacecraft, which limits the exposure time.[5][21] The spacecraft does not have reaction wheels and is stabilized by thrusters.[21]

Examples
Name Wavelength Bandpass Aperture(s)
Human eye 400–700 nm (approx.)[26] 6 mm[27]
LORRI 350 – 850 nm 208 mm
Alice 70-205 nm[28][29] (two; 40 x 40 mm2
1 mm [30]

Jovian system

While passing by Jupiter in February 2007, the Jovian system was observed using LORRI and other instruments.[31]

LORRI views of the Galilean moons:

Jovian moons imaged by New Horizons
Io imaged on February 28, 2007. The feature near the north pole of the moon is a 290 km (180 mi) high plume from the volcano Tvashtar.
Europa imaged on February 27 from a distance of 3.1 million km (1.9 million mi). Image scale is 15 km per pixel (9.3 mi/px).
Ganymede imaged on February 27, 2007, from a distance of 3.5 million km (2.2 million mi). Image scale is 17 km per pixel (11 mi/px).
Callisto imaged on February 27 from a distance of 4.7 million km (2.9 million mi).
Media related to Photos of Jupiter system by New Horizons at Wikimedia Commons
LORRI has great telescopic power, providing views from larger distances

Pluto

Due to its telescope power, LORRI was able to capture images of Pluto and its moons, offering the closer views as the spacecraft flew by the dwarf planet.

  • Long range view with Pluto and moons circled. (stars processed out)
    Long range view with Pluto and moons circled. (stars processed out)
  • Observation of Pluto and Charon from January 2015
    Observation of Pluto and Charon from January 2015
  • LORRI image of Pluto and Charon in June 2015
    LORRI image of Pluto and Charon in June 2015
  • Days before closest approach, LORRI views the other side of Pluto
    Days before closest approach, LORRI views the other side of Pluto
  • Mountain range on Pluto near Tombaugh Regio
    Mountain range on Pluto near Tombaugh Regio
  • What is thought to be a frozen pond on Pluto, about 20 miles (30 kilometers) across
    What is thought to be a frozen pond on Pluto, about 20 miles (30 kilometers) across
  • Several images from LORRI composited together
    Several images from LORRI composited together

Charon

LORRI and Ralph data combination of Charon in 2015.

15810 Arawn

In 2016 New Horizons observed the Kuiper belt object, 15810 Arawn. It is the object that is pointed with an arrow.[32]

KBO 15810 Arawn by New Horizons in April 2016.

486958 Arrokoth

Long-distance views

Approach views

  • Wiggle animation of Arrokoth
    Wiggle animation of Arrokoth
  • With arrows
    With arrows
  • Arrokoth as seen by LORRI during its approach, and released on January 1, 2019.[35]
    Arrokoth as seen by LORRI during its approach, and released on January 1, 2019.[35]
  • Arrokoth as seen by LORRI on January 1, 2019, at distance of 18,000 miles (28,000 kilometers).
    Arrokoth as seen by LORRI on January 1, 2019, at distance of 18,000 miles (28,000 kilometers).

Closest views of Pluto flyby

Since LORRI had the highest magnification of the instruments, it captured the closest views of Pluto's terrain during the flyby. Its smaller field of view was panned across Pluto, capturing a stripe of the dwarf planet's terrain.

This image taken by LORRI is among the highest resolution views of the surface of Pluto during the encounter, capturing an area 50 miles (80 kilometers) wide and over 400 miles (700 kilometers) long.

See also

References

  1. ^ Talbert, Tricia (2015-03-26). "Long Range Reconnaissance Imager (LORRI) Instrument". NASA. Retrieved 2018-10-15.
  2. ^ Taylor, Alan. "The Voyage of New Horizons: Jupiter, Pluto, and Beyond". The Atlantic. Retrieved 2018-10-15.
  3. ^ Tavares, Frank (2020-02-13). "Arrokoth Revealed: A First In-Depth Look at a Pristine World". NASA. Retrieved 2020-09-16.
  4. ^ a b c d e f g h i j k l Cheng, A. F.; Weaver, H. A.; Conard, S. J.; Morgan, M. F.; Barnouin-Jha, O.; Boldt, J. D.; Cooper, K. A.; Darlington, E. H.; Grey, M. P.; Hayes, J. R.; Kosakowski, K. E.; Magee, T.; Rossano, E.; Sampath, D.; Schlemm, C.; Taylor, H. W. (2009). "Long-Range Reconnaissance Imager on New Horizons". New Horizons. pp. 189–215. doi:10.1007/978-0-387-89518-5_9. ISBN 978-0-387-89517-8.
  5. ^ a b c d e "New Horizons Mission Spacecraft". Johns Hopkins Applied Physics Lab. Retrieved November 12, 2022.
  6. ^ Buratti, B. J.; Hofgartner, J. D.; Hicks, M. D.; Weaver, H. A.; Stern, S. A.; Momary, T.; Mosher, J. A.; Beyer, R. A.; Verbiscer, A. J.; Zangari, A. M.; Young, L. A.; Lisse, C. M.; Singer, K.; Cheng, A.; Grundy, W.; Ennico, K.; Olkin, C. B. (2017). "Global albedos of Pluto and Charon from LORRI New Horizons observations". Icarus. 287: 207–217. arXiv:1604.06129. Bibcode:2017Icar..287..207B. doi:10.1016/j.icarus.2016.11.012. S2CID 118330416.
  7. ^ "New Horizons Sets Up for New Year's Flyby of Ultima Thule - Astrobiology Magazine". Astrobiology Magazine. 2018-10-09. Retrieved 2018-10-15.
  8. ^ "Engine burn puts New Horizons on track to Ultima Thule". SpaceFlight Insider. 2018-10-09. Retrieved 2018-10-15.
  9. ^ Zemcov, Michael; Immel, Poppy; Nguyen, Chi; Cooray, Asantha; Lisse, Carey M.; Poppe, Andrew R. (2017). "Measurement of the cosmic optical background using the long range reconnaissance imager on New Horizons". Nature Communications. 8: 15003. arXiv:1704.02989. Bibcode:2017NatCo...815003Z. doi:10.1038/ncomms15003. PMC 5394269. PMID 28397781.
  10. ^ "Great Exploration Revisited: The 2007 Flyby of Jupiter".
  11. ^ a b JHUAPL. "LORRI Looks Back at "Old Friend" Jupiter". New Horizons. Retrieved 2018-11-09.
  12. ^ "New Horizons". pluto.jhuapl.edu. Archived from the original on 2015-07-15. Retrieved 2018-11-09.
  13. ^ a b "Great Exploration Revisited: The 2007 Flyby of Jupiter".
  14. ^ First Image Taken by Hubble's Wide Field Planetary Camera, Hubblesite.org
  15. ^ JHUAPL. "Ultima in View". New Horizons. Retrieved 2018-11-09.
  16. ^ "New Horizons Sees No Moons or Rings around Ultima Thule, Opts for Primary Flyby Path | Space Exploration | Sci-News.com". Breaking Science News | Sci-News.com. 19 December 2018. Retrieved 2018-12-19.
  17. ^ a b "New Horizons: Image?page=1&gallery_id=2&image_id=560". pluto.jhuapl.edu. Retrieved 2018-12-31.
  18. ^ "New Horizons: News Article?page=20181226". pluto.jhuapl.edu. Retrieved 2018-12-31.
  19. ^ "NASA - LORRI Instrument".
  20. ^ a b Robichaud, J.; Green, J.; Catropa, D.; Rider, B.; Ullathorne, C. (2008). "Silicon Carbide Optics for Space Situational Awareness and Responsive Space Needs". Advanced Maui Optical and Space Surveillance Technologies Conference: E67. Bibcode:2008amos.confE..67R.
  21. ^ a b c d Cheng, A. F.; Weaver, H. A.; Conard, S. J.; Morgan, M. F.; Barnouin-Jha, O.; Boldt, J. D.; Cooper, K. A.; Darlington, E. H.; Grey, M. P.; Hayes, J. R.; Kosakowski, K. E.; Magee, T.; Rossano, E.; Sampath, D.; Schlemm, C.; Taylor, H. W. (2008). "Long-Range Reconnaissance Imager on New Horizons". Space Science Reviews. 140 (1–4): 189–215. arXiv:0709.4278. Bibcode:2008SSRv..140..189C. doi:10.1007/s11214-007-9271-6. S2CID 118330150.
  22. ^ "Teledyne e2V CCD47-20 Back Illuminated NIMO Frame-Transfer High Performance CCD Sensor". Retrieved November 12, 2022.
  23. ^ "New Horizons prepares for encounter with 2014 MU69". www.planetary.org. Retrieved 2018-11-07.
  24. ^ "New Horizons prepares for encounter with 2014 MU69". www.planetary.org. Retrieved 2018-11-07.
  25. ^ "New Horizons prepares for encounter with 2014 MU69". www.planetary.org. Retrieved 2018-11-07.
  26. ^ "What Is the Visible Light Spectrum?". ThoughtCo. Retrieved 2018-11-09.
  27. ^ "How to Calculate the F-stop of the Human Eye". Popular Photography. Retrieved 2018-11-09.
  28. ^ Stern, S. A.; Slater, D. C.; Scherrer, J.; Stone, J.; Versteeg, M.; et al. (February 2007). "Alice: The Rosetta Ultraviolet Imaging Spectrograph". Space Science Reviews. 128 (1–4): 507–527. arXiv:astro-ph/0603585. Bibcode:2007SSRv..128..507S. doi:10.1007/s11214-006-9035-8. S2CID 44273197.
  29. ^ Stern, S. A.; Slater, D. C.; Gibson, W.; Scherrer, J.; A'Hearn, M.; et al. (1998). "Alice—An Ultraviolet Imaging Spectrometer for the Rosetta Orbiter". Advances in Space Research. 21 (11): 1517–1525. Bibcode:1998AdSpR..21.1517S. doi:10.1016/S0273-1177(97)00944-7.
  30. ^ "ALICE: The ultraviolet imaging spectrograph aboard the New Horizons Pluto mission spacecraft" (PDF). Retrieved November 12, 2022.
  31. ^ "New Horizons". pluto.jhuapl.edu. Archived from the original on 2018-11-09. Retrieved 2018-11-09.
  32. ^ "Catalog Page for PIA20589". photojournal.jpl.nasa.gov. Retrieved 2018-10-18.
  33. ^ "JPL Horizons". JPL. Retrieved 28 August 2018.
  34. ^ "New Horizons: Image?page=1&gallery_id=2&image_id=560".
  35. ^ "New Horizons: Image?page=1&gallery_id=2&image_id=572".

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