Hubble Telescope Discovers New Moon Around Neptune

Nasa’s Hubble telescope discovers new Neptune moon

Nasa diagram of Neptune and its new moon  
Voyager failed to spot the tiny moon during its 1989 fly-pass
The Hubble space telescope has discovered a new moon orbiting Neptune, Nasa has confirmed.

Designated S/2004 N 1, this is the 14th known moon to circle the giant planet.

It also appears to be the smallest moon in the Neptunian system, measuring just 20 km (12 miles) across, completing one revolution around Neptune every 23 hours.

US astronomer Mark Showalter spotted the tiny dot while studying segments of rings around Neptune.


Nasa said the moon was roughly 100 million times dimmer than the faintest star visible to the naked eye.

It is so small that the Voyager spacecraft failed to spot it in 1989 when it passed close by Neptune and surveyed the planet’s system of moons and rings.

Mr Showalter’s method of discovery involved tracking the movement of a white fleck appearing over and over again in more than 150 photographs taken of Neptune by Hubble between 2004 and 2009.
“The moons and arcs orbit very quickly, so we had to devise a way to follow their motion in order to bring out the details of the system,” Mr Showalter explained.

“It’s the same reason a sports photographer tracks a running athlete – the athlete stays in focus, but the background blurs.”

http://www.bbc.co.uk/news/science-environment-23318301

One thought on “Hubble Telescope Discovers New Moon Around Neptune

  1. Can we really call such a tiny 26th magnitude rock a moon? It may be nothing more than a captured asteroid. We need a new system where rocks too small to be round are known as dwarf moons or moonlets.

Tell The Universe What You Think

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s