Jupiter is now an unmistakable dazzling object moving retrograde among the stars of Leo. On March 8th the current apparition peaks when opposition is reached. On this day the "King of the planets" shines brightest for the year attaining its largest apparent size. Visible all night long Jupiter rises in the east at sunset, reaches its highest point in the sky around midnight before setting in the west at sunrise.

Hubble Space Telescope image of Jupiter on April 21, 2014 (credit - NASA/ESA/A.Simon/Goddard Space Flight Center)

The largest of the 8 planets in the Solar System is currently located in southeastern Leo close to the Virgo border. With a declination of 6 degrees north it's best seen from equatorial and tropical latitudes although reasonably well placed from all accessible locations worldwide. From mid-latitude northern or southern locations Jupiter attains a respectable peak altitude of about 45 degrees during the middle of the night.

Jupiter opposition finder chart on March 8, 2016 (credit:- freestarcharts)

Jupiter opposition finder chart on March 8, 2016 - pdf format (credit:- freestarcharts)

At opposition this year, Jupiter is located 4.435 AU (663.5 million kilometers or 412.3 million miles) from Earth. Although slightly further away than last year its apparent size is still an impressive 44.4 arc seconds. Of all planets only Venus - on rare occasions - displays a greater apparent size than Jupiter.

Popular 7x50 and 10x50 binoculars show a very small white or creamy coloured planetary disk without detail. Easily seen are Jupiter's four large Galilean moons (Io, Europa, Ganymede and Callisto) which continuously change position as they orbit the giant planet. Sometimes all four are visible at once but on occasions the satellites will be temporarily obstructed as they pass by the planetary disk.

Theoretically all four moons are bright enough to be seen with the naked eye but their close proximity too much brighter Jupiter makes this task virtually impossible. However, a few very keen eyed observers have managed to spot them without optical aid. For comparison, Io shines at magnitude +5.3, Europa magnitude +5.6, Ganymede magnitude +4.9 and Callisto at magnitude +6.0.

Io, Europa, Ganymede and Callisto (credit:- NASA)

Through a telescope a wealth of Jupiter's surface details are visible. Even a small 60mm (2.4-inch) scope at medium/high magnifications will show a number of details including the great northern and southern equatorial belts. Keen eyed observers under good conditions may also be able to see shadow transits of the Galilean moons on the Jovian disk. A larger 100mm (4-inch) telescope reveals ample bright and dark spots and the Solar System's most famous storm "The Great Red Spot". This complex weather system has been observed for centuries but is now diminishing in size. In the late 1800's its diameter was estimated at 41,038 kilometres (25,500 miles). At the time of the twin Voyager space probes flybys in 1979 it had shrunk to 23,336 kilometres (14,500 miles) with recent measurements from Hubble Space telescope images putting it at 17,912 kilometres (11,130 miles). This is a far cry from two hundred years ago and one day it will probably disappear completely.

With a 200mm (8-inch) telescope or larger Jupiter is a spectacular sight with well defined features along with subtle markings, smaller belts, ovals and festoons visible in the cloud structure. Under good seeing it's possible to push scopes close to their maximum magnification limits. This is generally accepted to be 50x for every 25mm (1-inch) of aperture.

But as always whatever binoculars / telescope you are using or even just with the naked eye, Jupiter is a fantastic object to view especially around opposition time.

Jupiter Opposition 2016 Data Table

Opposition DateMarch 8, 2016
Distance from Earth (AU)4.435
Distance from Earth (Million Kilometres)663.5
Distance from Earth (Million Miles)412.3
ConstellationLeo
Magnitude-2.5
RA (J2000)11h 18m 27s
DEC (J2000)+06d 04m 22s
Apparent Diameter (arcsecs)44.4
Io Magnitude+5.3
Europa Magnitude+5.6
Ganymede Magnitude+4.9
Callisto Magnitude+6.0

Sky Highlights - May 2017

Mercury
Mercury reaches greatest elongation west on May 17, 2017

Meteor Shower
Eta Aquariids meteor shower peaks on May 5th and 6th, 2017

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for May 2017

Northern Hemisphere
Evening
West:- Mars (mag. +1.6)
South:- Jupiter (mag. -2.4)
Midnight
Southwest:- Jupiter
Southeast:- Saturn (mag. +0.2)
Morning
South:- Saturn
East:- Venus (mag. -4.7)

Southern Hemisphere
Evening
West:- Mars
North:- Jupiter
Midnight
Northwest:- Jupiter
North:- Saturn
Morning
Northwest:- Saturn
East:- Venus, Mercury (mag. +2.5 to -0.3), Neptune (mag. +7.9)

Deep Sky
Naked eye / binoculars:-
Melotte 111 - Mel 111 - The Coma Star Cluster (Open Cluster)
Messier 44 - M44 - The Praesepe (Open Cluster)

Telescopes:-
Messier 67 - M67 - Open Cluster
Messier 51 - M51 - The Whirlpool Galaxy (Spiral Galaxy)
Messier 97 - M97 - The Owl Nebula (Planetary Nebula)
Messier 101 - M101 - The Pinwheel Galaxy (Spiral Galaxy)
Messier 65 – M65 – Spiral Galaxy
Messier 66 - M66 - Intermediate Spiral Galaxy
Messier 95 - M95 - Barred Spiral Galaxy
Messier 96 - M96 - Intermediate Spiral Galaxy
NGC 4244 - Spiral Galaxy
NGC 4565 - Needle Galaxy - Spiral Galaxy

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