Starship Asterisk*

The links to the discussion, the previous and next day are all the same as for the Oct 04 page :roll:

[quote=neufer post_id=295908 time=1570292079 user_id=124483]
[quote=Psnarf post_id=295906 time=1570289432 user_id=129160]

What is that dot just to the right of the Moon, Saturn?[/quote]

[list][size=150]ξ Ophiuchi ?[/size][/list]
[/quote]
An ID for the brightest star (mag~7) to the right if the moon is HIP 84198. 4th magnitude ξ Oph (Aggia) is about 1° beyond the upper left corner (1.5° from the moon).

Beautiful. Too bad we are not allowed on Europa.

[quote=JohnD post_id=295909 time=1570292387 user_id=100329]
The eye is superior to the emulsion, or digital camera equivalent, which is why this picture is "A blend of short and long exposures"
Could the eye have seen this, down the appropriate telescope to achieve the same magnification?

If not, then I submit, M'Luds, that this is another picture where art has conquered science.
John
[/quote]

The eye is significantly inferior to modern electronic sensors. It is lower resolution, it has poor optical quality, it has low quantum efficiency, and it has poor dynamic range. Do not confuse the ability of the eye with the ways that our visual processing system can make up for this, allowing our brains to construct an image that bears little resemblance to what is on the retina itself.

In short, you could not see an image like this with your eye, except by moving your eye around between the different parts and letting your brain paint a larger image. But this image captures rather well how you would perceive this scene through a small telescope (like a pair of binoculars). Eye or camera, either requires post processing to produce a realistic image.

The eye is superior to the emulsion, or digital camera equivalent, which is why this picture is "A blend of short and long exposures"
Could the eye have seen this, down the appropriate telescope to achieve the same magnification?

If not, then I submit, M'Luds, that this is another picture where art has conquered science.
John

[quote=Psnarf post_id=295906 time=1570289432 user_id=129160]

What is that dot just to the right of the Moon, Saturn?[/quote]

[list][size=150]ξ Ophiuchi ?[/size][/list]

What is that dot just to the right of the Moon, Saturn?

[quote=BDanielMayfield post_id=295901 time=1570284957 user_id=139536]

Have photos of all six large moons in the same frame been taken?[/quote]
Probably...but since Titan is more than 10 times dimmer than Jupiter's large moons
it would require some processing to see them all at once.

Have photos of all six large moons in the same frame been taken?

I like it! 8-)

[url=https://apod.nasa.gov/apod/ap191005.html] [img]https://apod.nasa.gov/apod/calendar/S_191005.jpg[/img] [size=150]Jupiter and the Moons[/size][/url]

[b] Explanation: [/b] After sunset on October 3, some of the Solar System's largest moons stood low along the western horizon with [url=https://www.nasa.gov/jupiter]the largest planet[/url]. Just after nightfall, a pairing of the Moon approaching first quarter phase and Jupiter was captured in this telephoto field of view. A blend of short and long exposures, it reveals [url=https://en.wikipedia.org/wiki/Suite_bergamasque#3._Clair_de_lune]the familiar[/url] face of our fair planet's own large natural satellite in stark sunlight and [url=https://apod.nasa.gov/apod/ap190926.html]faint earthshine[/url]. At lower right are the ruling gas giant and its four Galilean moons. Left to right, the tiny pinpricks of light are Ganymede, [Jupiter], Io, Europa, and Callisto. Our own natural satellite appears to loom large because it's close, but Ganymede, Io, and Callisto are actually larger than Earth's Moon. [url=https://www.nasa.gov/europa]Water world Europa[/url] is only slightly smaller. Of the Solar System's six [url=http://www.ianridpath.com/moons.htm]largest planetary satellites[/url], only Saturn's moon Titan, is missing from this scene. [url=https://www.skyandtelescope.com/observing/this-weeks-sky-at-a-glance-october-4-12/]But be sure[/url] to check for large moons [url=https://solarsystem.nasa.gov/news/1075/10-things-international-observe-the-moon-night/]in your sky tonight[/url].


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