Solar System Phenomena — Selected Minor Planets at Opposition in 2021

Positions of selected minor planets at opposition in 2021

The chart shows the positions selected minor planets at the instants of their oppositions (in ecliptic longitude). Only 4 Vesta has the potential to reach naked-eye visibility but the other large asteroids — 1 Ceres, 2 Pallas and 3 Juno — are visible in small- to medium-sized telescopes. The trans-Neptunian dwarf planets require large telescopes and detailed finder charts, and with the possible of exception of 134340 Pluto, are probably beyond the reach of amateur astronomers. Note that many of these minor planets have relatively large inclinations and may stray far from the ecliptic (which is marked on the chart).

14 January 134340 Pluto conjunction
09 February 2 Pallas conjunction
04 March 4 Vesta opposition in Leo magnitude +6.2
27 March 136472 Makemake opposition in Coma Berenices magnitude +17.1
07 April 1 Ceres conjunction
13 April 136199 Eris conjunction
17 April 136108 Haumea opposition in Boötes magnitude +17.3
06 June 3 Juno opposition in Ophiuchus magnitude +10.1
17 July 134340 Pluto opposition in Sagittarius magnitude +14.9
11 September 2 Pallas opposition in Pisces magnitude +8.6
30 September 136472 Makemake conjunction
17 October 136199 Eris opposition in Cetus magnitude +18.7
21 October 136108 Haumea conjunction
27 November 1 Ceres opposition in Taurus magnitude +7.2
28 November 4 Vesta conjunction


Minor planet positions at opposition are provided by the Minor Planet Center.