voy2_v_bw_o_TPMBK (P-34727, Voyager 2-N68; PIA00062 eq)
“This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair. The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.”
photojournal.jpl.nasa.gov/catalog/PIA00062
Credit: JPL Photojournal website
Being from the estate of Eric Burgess, the photograph was sourced for ‘Figure 5-15’, page 111, in his book “FAR ENCOUNTER – THE NEPTUNE SYSTEM”, with the following caption/description:
“This image of 1989N1 was obtained from a range of 91,000 miles (146,000 km). The satellite is half illuminated. There are hints of many craters and grove-like lineaments. What appears to be a huge crater with a diameter of 90 miles (150 km) mars the top part of the terminator region (NASA/JPL)”
The above, with the image (of the scanned book) is available at:
archive.org/details/farencounternept00burg/page/110/mode/2up
Credit: Internet Archive website (account required to view). Regardless, an account is HIGHLY RECOMMENDED, there’s no obligation and you WILL NOT regret it!)
1989N1 was later named ‘Proteus’ on September 16, 1989. The subsequent caption associated with that name, but applied to the same image:
“Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1989 by the Voyager 2 spacecraft. This is unusual since Neptune has a smaller moon - Nereid - which was discovered 33 years earlier from Earth. The reason Proteus was not discovered sooner is that its surface is very dark and it orbits much closer to Neptune. Proteus has an odd box-like shape and were it even slightly more massive, its own gravity would cause it to reform itself into a sphere.
Original NASA caption: This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair.
The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear.”
Above at/from:
commons.wikimedia.org/wiki/File:Proteus_(Voyager_2).jpg
Credit: Wikimedia Commons
Way more than I expected to find regarding 1989N1/Proteus. A few being:
en.wikipedia.org/wiki/Proteus_(moon)
Credit: Wikipedia
astro.if.ufrgs.br/solar/proteus.htm
Credit: UFRGS (Federal University of Rio Grande do Sul) website
“Note the enormous impact crater, the result of a powerful collision that almost tore Proteus apart 4 billion years ago. According to some, that impact would have produced a large cloud of debris, some of which spiraled away into space, and some of which might have formed the tiny moon Hippocamp.
The above paraphrased from:
www.latimes.com/science/sciencenow/la-sci-sn-new-neptune-...
Credit: Los Angeles Times online website
Finally, the image at the far right would appear to be a state-of-art processed version of my posted photo, which seems to resolve the 'massive crater' into multiple overlapping smaller impact craters:
twitter.com/tedstryk/status/963538615816081408
pbs.twimg.com/media/DV8s-dXX4AAa4L4?format=jpg&name=9...
Both above credit: Ted Stryk/Twitter
voy2_v_bw_o_TPMBK (P-34727, Voyager 2-N68; PIA00062 eq)
“This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair. The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear. The Voyager Mission is conducted by JPL for NASA's Office of Space Science and Applications.”
photojournal.jpl.nasa.gov/catalog/PIA00062
Credit: JPL Photojournal website
Being from the estate of Eric Burgess, the photograph was sourced for ‘Figure 5-15’, page 111, in his book “FAR ENCOUNTER – THE NEPTUNE SYSTEM”, with the following caption/description:
“This image of 1989N1 was obtained from a range of 91,000 miles (146,000 km). The satellite is half illuminated. There are hints of many craters and grove-like lineaments. What appears to be a huge crater with a diameter of 90 miles (150 km) mars the top part of the terminator region (NASA/JPL)”
The above, with the image (of the scanned book) is available at:
archive.org/details/farencounternept00burg/page/110/mode/2up
Credit: Internet Archive website (account required to view). Regardless, an account is HIGHLY RECOMMENDED, there’s no obligation and you WILL NOT regret it!)
1989N1 was later named ‘Proteus’ on September 16, 1989. The subsequent caption associated with that name, but applied to the same image:
“Proteus is the second largest moon of Neptune behind the mysterious Triton. Proteus was discovered only in 1989 by the Voyager 2 spacecraft. This is unusual since Neptune has a smaller moon - Nereid - which was discovered 33 years earlier from Earth. The reason Proteus was not discovered sooner is that its surface is very dark and it orbits much closer to Neptune. Proteus has an odd box-like shape and were it even slightly more massive, its own gravity would cause it to reform itself into a sphere.
Original NASA caption: This image of Neptune's satellite 1989N1 was obtained on Aug. 25, 1989 from a range of 146,000 kilometers (91,000 miles). The resolution is about 2.7 kilometers (1.7 miles) per line pair.
The satellite, seen here about half illuminated, has an average radius of some 200 kilometers (120 miles). It is dark (albedo 6 percent) and spectrally grey. Hints of crater-like forms and groove-like lineations can be discerned. The apparent graininess of the image is caused by the short exposure necessary to avoid significant smear.”
Above at/from:
commons.wikimedia.org/wiki/File:Proteus_(Voyager_2).jpg
Credit: Wikimedia Commons
Way more than I expected to find regarding 1989N1/Proteus. A few being:
en.wikipedia.org/wiki/Proteus_(moon)
Credit: Wikipedia
astro.if.ufrgs.br/solar/proteus.htm
Credit: UFRGS (Federal University of Rio Grande do Sul) website
“Note the enormous impact crater, the result of a powerful collision that almost tore Proteus apart 4 billion years ago. According to some, that impact would have produced a large cloud of debris, some of which spiraled away into space, and some of which might have formed the tiny moon Hippocamp.
The above paraphrased from:
www.latimes.com/science/sciencenow/la-sci-sn-new-neptune-...
Credit: Los Angeles Times online website
Finally, the image at the far right would appear to be a state-of-art processed version of my posted photo, which seems to resolve the 'massive crater' into multiple overlapping smaller impact craters:
twitter.com/tedstryk/status/963538615816081408
pbs.twimg.com/media/DV8s-dXX4AAa4L4?format=jpg&name=9...
Both above credit: Ted Stryk/Twitter