136199 Eris at solar conjunction

2019 Apr 13

136199 Eris will pass very close to the Sun in the sky as its orbit carries it around the far side of the solar system from the Earth.

At closest approach, 136199 Eris will appear at a separation of only 11° from the Sun, making it totally unobservable for several weeks while it is lost in the Sun’s glare.

At around the same time, 136199 Eris will also be at its most distant from the Earth – receding to a distance of 97.04 AU – since the two planets will lie on opposite sides of the solar system.

If 136199 Eris could be observed at this time, it would appear at its smallest and faintest on account of its large distance. It would measure 0.0 arcsec in diameter.

Over following weeks and months, 136199 Eris will re-emerge to the west of the Sun, gradually becoming visible for ever-longer periods in the pre-dawn sky. After around six months, it will reach opposition, when it will be visible for virtually the whole night. A chart of the path of 136199 Eris across the sky in 2019 can be found here, and a chart of its rising and setting times here.

The position of 136199 Eris at the moment it passes solar conjunction will be:

Object Right Ascension Declination Constellation Angular Size
136199 Eris 01h43m50s -01°51' Cetus 0.0"
Sun 01h26m +09°04' Pisces 31'54"

The coordinates above are given in J2000.0.

This entry in the observing calendar was provided by In-The-Sky.org

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