136108 Haumea will reach opposition, when it lies opposite to the Sun in the sky. Lying in the constellation Bootes, it will be visible for much of the night, reaching its highest point in the sky around midnight local time.
From San Diego, it will be visible in the morning sky, becoming accessible around 20:35, when it reaches an altitude of 22° above your eastern horizon. It will then reach its highest point in the sky at 01:28, 72° above your southern horizon. It will be lost to dawn twilight around 05:08, 37° above your western horizon.
A close approach to the Earth
At around the same time that 136108 Haumea passes opposition, it also makes its closest approach to the Earth – termed its perigee – making it appear at its brightest.
This happens because when 136108 Haumea lies opposite to the Sun in the sky, the Earth passes between 136108 Haumea and the Sun. The solar system is lined up with 136108 Haumea and the Earth on the same side of the Sun, as shown by the configuration labelled perigee in the diagram below:
In practice, however, 136108 Haumea orbits much further out in the solar system than the Earth – at an average distance from the Sun of 43.08 times that of the Earth, and so its brightness does not vary much as it cycles between opposition and solar conjunction.
Observing 136108 Haumea
At opposition, 136108 Haumea is visible for much of the night. When it lies opposite to the Sun in the sky, this means that it rises at around the time the Sun sets, and it sets at around the time the Sun rises. It reaches its highest point in the sky at around midnight local time.
But even when it is at its closest point to the Earth, 136108 Haumea is so distant from the Earth that it is not possible to distinguish it as more than a star-like point of light, even through a telescope.
|Object||Right Ascension||Declination||Constellation||Magnitude||Angular Size|
The coordinates above are given in J2000.0.
Over the weeks following its opposition, 136108 Haumea 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 sky on 22 April 2025|
24 days old
All times shown in PDT.
The circumstances of this event were computed using the DE430 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.
|22 Apr 2025||– 136108 Haumea at opposition|
|23 Apr 2026||– 136108 Haumea at opposition|
|24 Apr 2027||– 136108 Haumea at opposition|
|25 Apr 2028||– 136108 Haumea at opposition|
© Mike Brown et al., CalTech and Keck Observatory