News

Shedding light on Pluto’s glaciers

20 September 2016 Astronomy Now

What is the origin of the large heart-shaped nitrogen glacier on Pluto revealed by NASA’s New Horizons spacecraft in 2015? Two French researchers show that Pluto’s peculiar insolation and atmosphere favour nitrogen condensation near the equator, in the lower altitude regions, leading to an accumulation of ice at the bottom of Sputnik Planum, a vast topographic basin.

News

Pluto ‘paints’ its largest moon red

15 September 2016 Astronomy Now

In June 2015, when the cameras on NASA’s approaching New Horizons spacecraft first spotted the large reddish polar region on Pluto’s largest moon, Charon, mission scientists knew two things: they’d never seen anything like it elsewhere in our Solar System, and they couldn’t wait to get the story behind it.

News

Hunt for Planet 9 reveals extremely distant solar system objects

30 August 2016 Astronomy Now

In the race to discover a proposed ninth planet in our solar system, astronomers are conducting the largest, deepest survey for objects beyond Neptune and the Kuiper Belt. Nearly 10 percent of the sky has been explored to date using some of the largest and most advanced telescopes, revealing several never-before-seen objects at extreme distances from the Sun.

Picture This

SOHO sees bright sungrazer comet

7 August 2016 Astronomy Now

ESA and NASA’s Solar and Heliospheric Observatory, or SOHO, saw a bright comet plunge toward the Sun on 3-4 August 2016, at nearly 1.3 million miles per hour. The comet, first spotted by SOHO on 1 August, is part of the Kreutz family of comets, a group with related orbits that broke off of a huge comet several centuries ago.

News

Solving the mystery of how comets are born

29 July 2016 Astronomy Now

Detailed analysis of data collected from Comet 67P/Churyumov-Gerasimenko by ESA’s Rosetta spacecraft show that comets are the ancient leftovers of early solar system formation, and not younger fragments resulting from subsequent collisions between other, larger bodies.

News

New distant dwarf planet found beyond Neptune

11 July 2016 Astronomy Now

An international team of astronomers have discovered a new dwarf planet orbiting beyond Neptune. The object is roughly 435 miles in size, moving in a 700-year orbit that takes it more than 120 times further from the Sun than Earth. Designated 2015 RR245, it was found using the Canada-France-Hawaii Telescope on Maunakea, Hawaii.

Picture This

A ‘super Grand Canyon’ on Pluto’s moon Charon

24 June 2016 Astronomy Now

Pluto’s largest moon, Charon, is home to an unusual canyon system that’s far longer and deeper than Arizona’s Grand Canyon. As far as NASA’s New Horizons scientists can tell, the canyon informally named Argo Chasma has a total length of approximately 430 miles — one and a half times the length and five times the depth of the Grand Canyon on Earth.

News

Pluto could still have a liquid sub-surface ocean

22 June 2016 Astronomy Now

NASA’s New Horizons spacecraft spied extensional faults on Pluto, a sign that the dwarf planet has undergone a global expansion possibly due to the slow freezing of a sub-surface ocean. A new analysis by Brown University scientists bolsters that idea, and suggests that ocean is likely still there today.

Observing

Find Pluto close to naked-eye star π Sagittarii (Albaldah) in late June

21 June 2016 Ade Ashford

In the latter part of June, Pluto is best seen low in the southern UK sky around 2am local time and reaches opposition on 7 July. The dwarf planet passes less than 1/20th of a degree south of naked-eye star pi (π) Sagittarii on 26—27 June in the deep twilight of the UK, but Southern Hemisphere observers will have the best views.