Dominic Ford, Editor
From the Dwarf Planets feed
From Cambridge, it will be visible between 23:09 and 02:28. It will become accessible around 23:09, when it rises to an altitude of 21° above your south-eastern horizon. It will reach its highest point in the sky at 00:50, 25° above your southern horizon. It will become inaccessible around 02:28 when it sinks below 22° above your south-western horizon.
134340 Pluto opposite the Sun
This optimal positioning occurs when 134340 Pluto is almost directly opposite the Sun in the sky. Since the Sun reaches its greatest distance below the horizon at midnight, the point opposite to it is highest in the sky at the same time.
At around the same time that 134340 Pluto passes opposition, it also makes its closest approach to the Earth – termed its perigee – making it appear at its brightest and largest.
This happens because when 134340 Pluto lies opposite the Sun in the sky, the solar system is lined up so that 134340 Pluto, the Earth and the Sun form a straight line with the Earth in the middle, on the same side of the Sun as 134340 Pluto.
In practice, however, 134340 Pluto orbits much further out in the solar system than the Earth – at an average distance from the Sun of 39.85 times that of the Earth, and so its angular size does not vary much as it cycles between opposition and solar conjunction.
On this occasion, 134340 Pluto will lie at a distance of 32.59 AU, and reach a peak brightness of magnitude 14.4. Even at its closest approach to the Earth, however, 134340 Pluto is so distant from the Earth that it is not possible to distinguish it as more than a star-like point of light.
134340 Pluto in coming weeks
Over the weeks following its opposition, 134340 Pluto will reach its highest point in the sky four minutes earlier each night, gradually receding from the pre-dawn morning sky while remaining visible in the evening sky for a few months.
The position of 134340 Pluto at the moment it passes opposition will be:
|Object||Right Ascension||Declination||Constellation||Magnitude||Angular Size|
The coordinates above are given in J2000.0.
|The sky on 12 July 2018|
29 days old
All times shown in EDT.
The circumstances of this event were computed using the DE405 planetary ephemeris published by the Jet Propulsion Laboratory (JPL).
This event was automatically generated by searching the ephemeris for planetary alignments which are of interest to amateur astronomers, and the text above was generated based on an estimate of your location.
|12 Jul 2018||– 134340 Pluto at opposition|
|14 Jul 2019||– 134340 Pluto at opposition|
|15 Jul 2020||– 134340 Pluto at opposition|
|18 Jul 2021||– 134340 Pluto at opposition|
© NASA/New Horizons