See also...

Authorizations, license

Visible by: Everyone
All rights reserved

45 visits

Neptune, a needle in an haystack

Neptune, a needle in an haystack
Being in a region without bright stars and a by times cloudy sky (see white streaks) made it difficult to find Neptune.To be continued

Black dots are stars on the map. White dots are stars on the photo.

Neptune is the eighth and farthest known Solar planet from the Sun. In the Solar System, it is the fourth-largest planet by diameter, the third-most-massive planet, and the densest giant planet. It is 17 times the mass of Earth, slightly more massive than its near-twin Uranus. Neptune is denser and physically smaller than Uranus because its greater mass causes more gravitational compression of its atmosphere. The planet orbits the Sun once every 164.8 years at an average distance of 30.1 AU (4.5 billion km; 2.8 billion mi). It is named after the Roman god of the sea and has the astronomical symbol ♆, a stylised version of the god Neptune's trident or the Greek letter psi.

Neptune is not known to be visible to the unaided eye and is the only planet in the Solar System found by mathematical prediction rather than by empirical observation. Unexpected changes in the orbit of Uranus led Alexis Bouvard to deduce that its orbit was subject to gravitational perturbation by an unknown planet. After Bouvard's death, the position of Neptune was predicted independently, by John Couch Adams and Urbain Le Verrier. Neptune was subsequently observed with a telescope on 23 September 1846[1] by Johann Galle within a degree of the position predicted by Le Verrier.


Erhard Bernstein, LutzP, Fred Fouarge, Beatrice Degan(MARS) and 5 other people have particularly liked this photo

 Fred Fouarge
Fred Fouarge club
dat begrijp ik niet maar is zeer interessant KO
2 months ago.
Ko Hummel club
has replied to Fred Fouarge club
heb de foot op een sterrenkaart gelegd en de foto halfdoorschijnend gemaakt. Dan zie je de zwarte circeltjes van de sterren op de kaart en daarboven op de witte sterrenpuntjes van de sterren op de foto
2 months ago.

to write a comment.