Saturn was the outermost planet known until William Herschel discovered Uranus in the late 18th Century, so unless you count this as ancient, it would be inaccurate to say that the ancients could 'see' the planets beyond Saturn.
Telescopes are first definitely attested in the early 17th Century. Photography in the modern sense (using a camera to record sharp images on a light-sensitive film, as opposed to more basic forms like the pinhole camera) didn't exist until the early 19th Century.
I'm guessing that your question arises from the (quite sensible) assumption that all of the planets were named by the ancients, but this is not the case. The 'trans-Saturnian' (if you'll pardon the term) planets were named after Greek and Roman deities by later astronomers.
Interestingly, Uranus and Pluto are named after Greek gods, rather than the Roman gods that give the other planets their names. I suppose that 'Caelus' and 'Dis Pater' didn't quite have the same ring to them.
Hope this helps.
Uranus was discovered by Sir William Herschel in 1781.
Neptune was discovered by John Couch Adams in 1846.
Pluto was discovered by astronomer Clyde Tombaugh in 1930.
Hubble Space telescope
2001
In 1863
In 1635
Saturn, Jupiter, Uranus, and Neptune are the outer planets and are also gas giant planets.
Neptune and Uranus are identical planets
No planets surround Neptune. But the closest planet is Uranus.
Jupiter, Saturn, Uranus and Neptune.
In 1635
In 1635
In 1635
Only Uranus and Neptune were not known to the Sumerians, and required telescopes in order to be discovered.
You can see five of the planets in our Solar System with the naked eye - they appear as bright stars. To see Uranus and Neptune, you need telescopes.
The Gas Giant planets are: Jupiter, Saturn, Uranus, and Neptune.
Neptune and Uranus both have high concentrations of methane in their atmospheres.
Jupiter, Saturn, Uranus, and Neptune are the four Jovian planets in this solar system.
Saturn, Jupiter, Uranus, and Neptune are the outer planets and are also gas giant planets.
Neptune and Uranus are identical planets
Of the presently known planets, Uranus and Neptune are farthest from the sun.Uranus, NeptuneOr maybe better to say "Neptune, Uranus" in that order as Neptune is further away than Uranus.
Uranus, and Neptune