Hubble data showing Neptune’s inner moons: This composite image shows the location of Neptune’s moon Hippocamp, formerly known just as S/2004 N 1, orbiting the giant planet Neptune, about 4.8 billion kilometres from Earth. The moon is only about 34 kilometres in diameter and dim, and was therefore missed by NASA's Voyager 2 spacecraft cameras when the probe flew by Neptune in 1989. Several other moons that were discovered by Voyager appear in this 2009 image, along with a circumplanetary structure known as ring arcs. Mark Showalter of the SETI Institute discovered Hippocamp in July 2013 when analysing over 150 archival images of Neptune taken by Hubble from 2004 to 2009. The black-and-white image was taken in 2009 with Hubble's Wide Field Camera 3 in visible light. Hubble took the colour inset of Neptune on August 19, 2009.

Name: Hippocamp, Neptune
Type: Solar System : Planet : Satellite
Category: Solar System
Release date: 20 February 2019, 19:00
Credit: NASA, ESA, and M. Showalter (SETI Institute)

Orbits of Neptune’s inner moons: This diagram shows the orbital positions of Neptune’s inner moons, which range in size from 17 to 420 kilometres in diameter. The outer moon Triton was captured from the Kuiper belt many billions of years ago. This tore apart Neptune’s original satellite system. After Triton settled into a circular orbit the debris from shattered moons re-coalesced into the second generation of inner satellites seen today. However, comet bombardment continued, leading to the birth of Hippocamp, which is a broken-off piece of Proteus. Therefore, Hippocamp is considered to be a third-generation satellite. Neither the size of the moons and Neptune, nor the orbits are to scale.

Name: Hippocamp, Neptune
Type: Solar System : Planet : Satellite
Category: Solar System
Release date: 20 February 2019, 19:00
Credit: NASA, ESA, and A. Feild (STScI)

Globular clusters surrounding the Milky Way (artist’s impression): This artist’s impression shows a computer generated model of the Milky Way and the accurate positions of the globular clusters used in this study surrounding it. Scientists used the measured velocities of these 44 globular clusters to determine the total mass of the Milky Way, our cosmic home.

Name: Milky Way
Type: Milky Way
Category: Galaxies
Release date: 7 March 2019, 16:00
Credit: ESA/Hubble, NASA, L. Calçada

Globular cluster NGC 4147: This globular cluster, NGC 4147, seen with the NASA/ESA Hubble Space Telescope, was one of many which were used by astronomers to measure the total mass of the Milky Way. NGC 4147 is located about 60 000 light-years from Earth in the northern constellation of Coma Berenices (the Berenice's hair).

Name: NGC 4147
Type: Milky Way : Star : Grouping : Cluster : Globular
Category: Star Clusters
Constellation: Coma Berenices
Distance: 60000 light years
Release date: 7 March 2019, 16:00
Credit: ESA/Hubble & NASA, T. Sohn et al.

Asteroid 6478 Gault: The asteroid 6478 Gault is seen with the NASA/ESA Hubble Space Telescope, showing two narrow, comet-like tails of debris that tell us that the asteroid is slowly undergoing self-destruction. The bright streaks surrounding the asteroid are background stars. The Gault asteroid is located between the orbits of Mars and Jupiter.

Name: 6478 Gault
Type: Solar System : Interplanetary Body : Asteroid
Category: Solar System
Release date: 28 March 2019, 15:00
Credit: NASA, ESA, K. Meech and J. Kleyna (University of Hawaii), O. Hainaut (European Southern Observatory)

The Crab of the Southern Sky: The Southern Crab Nebula — Hubble’s 29th anniversary image.

Name: Hen 2-104
Type: Milky Way : Nebula
Category: AnniversaryNebulae
Constellation: Centaurus
Distance: 7000 light years
Release date: 18 April 2019, 16:00
Credit: NASA, ESA, and STScI

Formation of the Southern Crab Nebula (artist's impression): This artist's impression of the formation of Southern Crab nebula illustrates its hourglass-shared structure, that has been created by the interaction between a pair of stars at its centre: a red giant and a white dwarf. The red giant is shedding its outer laters in the last phase of its life before it too lives out its final years as a white dwarf.

Type: Milky Way : Nebula : Type : Supernova Remnant
Category: Illustrations
Release date: 18 April 2019, 16:00
Credit: ESA/Hubble, M. Kornmesser

On the verge: NGC 4485 has been involved in a dramatic gravitational interplay with its larger galactic neighbour NGC 4490 — out of frame to the bottom right in this image. This ruined the original, ordered spiral structure of the galaxy and transformed it into an irregular one. The interaction also created a stream of material about 25 000 light-years long, connecting the two galaxies. The stream, visible to the right of the galaxy is made up of bright knots and huge pockets of gassy regions, as well as enormous regions of star formation in which young, massive, blue stars are born. Below NGC 4485 one can see a bright, orange background galaxy: CXOU J123033.6+414057. This galaxy is the source of X-ray radiation studied by the Chandra X-ray Observatory. It’s distance from Earth is about 850 million light-years.

Name: NGC 4485
Type: Local Universe : Galaxy : Type : Irregular
Category: Galaxies
Constellation: Canes Venatici
Distance: 30 million light years
Release date: 16 May 2019, 16:00
Credit: ESA/Hubble, NASA Acknowledgement: T. Roberts (Durham University), D. Calzetti (University of Massachusetts) and the LEGUS Team, R. Tully (University of Hawaii) and R. Chandar (University of Toledo).

Distant view of a galactic crash — NGC 4490 and NGC 4485 (ground-based image): This ground-based image shows the large galaxy NGC 4490 and the irregular galaxy NGC 4485 — above the larger galaxy in the centre of the image — it is interacting with. Both galaxies are connected with each other through a stream of material about 25 000 light-years long. The stream is made up of bright knots and huge pockets of gassy regions, as well as enormous regions of star formation in which young, massive, blue stars are born. Having already made their closest approach, NGC 4485 and NGC 4490 are now moving away from each other.

Name: NGC 4485, NGC 4490
Type: Local Universe : Galaxy : Type : Irregular
Category: Galaxies
Constellation: Canes Venatici
Release date: 16 May 2019, 16:00
Credit: NASA, ESA, Digitized Sky Survey 2 (Acknowledgement: Davide De Martin)

A tiny galaxy with a big heart: Nestled within this field of bright foreground stars lies ESO 495-21, a tiny galaxy with a big heart. ESO 495-21 is just 3000 light-years across, a fraction of the size of the Milky Way, but that is not stopping the galaxy from furiously forming huge numbers of stars. There are also indicators for a supermassive black hole in its centre - an unusual component for a galaxy of its size.

Type: Local Universe : Galaxy : Type : Irregular
Category: Galaxies
Constellation: Pyxis
Release date: 13 June 2019, 16:00
Credit: ESA/Hubble, NASA

Ground-based view of the sky around the galaxy ESO 495-21: This image shows the sky around the galaxy ESO 495-21. It was created from images forming part of the Digitized Sky Survey 2. Located about 30 million light-years away in the constellation of Pyxis (The Compass), ESO 495-21 is classified as a dwarf starburst galaxy.

Name: ESO 495-21
Type: Local Universe : Galaxy : Activity : Starburst
Category: Galaxies
Constellation: Pyxis
Release date: 13 June 2019, 16:00
Credit: ESA/Hubble, NASA, Digitized Sky Survey 2Acknowledgement: Davide de Martin