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Conjunction of Mercury and Eris

Dominic Ford, Editor
From the Conjunctions feed

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The sky at

Mercury and 136199 Eris will share the same right ascension, with Mercury passing 9°39' to the north of 136199 Eris.

From Cambridge however, the pair will not be observable – they will reach their highest point in the sky during daytime and will be 6° below the horizon at dawn.

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Mercury will be at mag 0.8 in the constellation Pisces, and 136199 Eris at mag 18.8 in the neighbouring constellation of Cetus.

A graph of the angular separation between Mercury and 136199 Eris around the time of closest approach is available here.

The positions of the two objects at the moment of conjunction will be as follows:

Object Right Ascension Declination Constellation Magnitude Angular Size
Mercury 01h44m50s +07°28' Pisces 0.8 9"1
136199 Eris 01h44m50s -02°10' Cetus 18.8 0"0

The coordinates above are given in J2000.0. The pair will be at an angular separation of 24° from the Sun, which is in Aries at this time of year.

The sky on 12 May 2017
Twilight ends
Twilight begins

16-day old moon
Waning Gibbous


16 days old

Rise Culm. Set
Mercury 04:37 11:08 17:38
Venus 03:40 09:54 16:07
Moon 21:37 01:44 06:46
Mars 06:38 14:14 21:50
Jupiter 16:27 22:15 04:07
Saturn 22:28 03:09 07:46
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.

Related news

13 Apr 2017  –  136199 Eris at solar conjunction
16 Oct 2017  –  136199 Eris at opposition
13 Apr 2018  –  136199 Eris at solar conjunction
17 Oct 2018  –  136199 Eris at opposition

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