301.

136472 Makemake at opposition 136472 Makemake lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Sun, 24 Feb 1991 at 17:52 EDT (12,176 days ago) in Ursa Major

302.

134340 Pluto at solar conjunction 134340 Pluto is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Sat, 10 Nov 1990 at 07:08 EDT (12,282 days ago) in Serpens Caput

303.

136199 Eris at opposition 136199 Eris lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Wed, 10 Oct 1990 at 06:06 EDT (12,313 days ago) in Cetus

304.

136108 Haumea at solar conjunction 136108 Haumea is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Thu, 20 Sep 1990 at 12:50 EDT (12,333 days ago) in Coma Berenices

305.

1 Ceres at perihelion 1 Ceres passes its orbit's closest point to the Sun. Fri, 14 Sep 1990 at 15:01 EDT (12,339 days ago) in Leo

306.

136472 Makemake at solar conjunction 136472 Makemake is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Tue, 28 Aug 1990 at 16:43 EDT (12,356 days ago) in Ursa Major

307.

1 Ceres at solar conjunction 1 Ceres is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Sat, 18 Aug 1990 at 18:15 EDT (12,366 days ago) in Leo

308.

134340 Pluto at opposition 134340 Pluto lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Mon, 07 May 1990 at 04:27 EDT (12,469 days ago) in Serpens Caput

309.

136199 Eris at solar conjunction 136199 Eris is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Fri, 06 Apr 1990 at 14:50 EDT (12,500 days ago) in Cetus

310.

136108 Haumea at opposition 136108 Haumea lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Sat, 17 Mar 1990 at 15:48 EDT (12,520 days ago) in Coma Berenices

311.

136472 Makemake at opposition 136472 Makemake lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Fri, 23 Feb 1990 at 10:11 EDT (12,542 days ago) in Ursa Major

312.

1 Ceres at opposition 1 Ceres lies in the opposite direction to the Sun in the sky, making it closer and brighter than at other times. It is also optimally positioned to be observable for much of the night. Mon, 18 Dec 1989 at 13:47 EDT (12,609 days ago) in Taurus

313.

134340 Pluto at solar conjunction 134340 Pluto is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Tue, 07 Nov 1989 at 11:16 EDT (12,650 days ago) in Libra

314.

136199 Eris at opposition 136199 Eris lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Mon, 09 Oct 1989 at 18:11 EDT (12,679 days ago) in Cetus

315.

136108 Haumea at solar conjunction 136108 Haumea is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Tue, 19 Sep 1989 at 07:51 EDT (12,699 days ago) in Coma Berenices

316.

134340 Pluto at perihelion 134340 Pluto passes its orbit's closest point to the Sun. Tue, 05 Sep 1989 at 14:58 EDT (12,713 days ago) in Libra

317.

136472 Makemake at solar conjunction 136472 Makemake is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Sun, 27 Aug 1989 at 08:07 EDT (12,722 days ago) in Ursa Major

318.

134340 Pluto at opposition 134340 Pluto lies in the opposite direction to the Sun in the sky, making it optimally positioned to be observable for much of the night. Thu, 04 May 1989 at 06:19 EDT (12,837 days ago) in Virgo

319.

1 Ceres at solar conjunction 1 Ceres is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Wed, 26 Apr 1989 at 20:15 EDT (12,845 days ago) in Cetus

320.

136199 Eris at solar conjunction 136199 Eris is unobservable as it passes around the far side of the Sun – marking the end of one apparition and the beginning of the next. Thu, 06 Apr 1989 at 02:54 EDT (12,865 days ago) in Cetus