301.

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. Wed, 13 Nov 1991 at 02:34 EDT (11,890 days ago) in Libra

302.

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. Thu, 10 Oct 1991 at 17:58 EDT (11,924 days ago) in Cetus

303.

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. Sat, 21 Sep 1991 at 18:08 EDT (11,943 days ago) in Coma Berenices

304.

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. Fri, 30 Aug 1991 at 01:37 EDT (11,965 days ago) in Ursa Major

305.

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. Fri, 10 May 1991 at 02:37 EDT (12,077 days ago) in Serpens Caput

306.

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. Tue, 16 Apr 1991 at 09:53 EDT (12,101 days ago) in Virgo

307.

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. Sun, 07 Apr 1991 at 01:50 EDT (12,110 days ago) in Cetus

308.

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. Mon, 18 Mar 1991 at 20:32 EDT (12,130 days ago) in Coma Berenices

309.

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 (12,152 days ago) in Ursa Major

310.

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 (12,258 days ago) in Serpens Caput

311.

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 (12,289 days ago) in Cetus

312.

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 (12,309 days ago) in Coma Berenices

313.

1 Ceres at perihelion 1 Ceres passes its orbit's closest point to the Sun. Fri, 14 Sep 1990 at 15:01 EDT (12,315 days ago) in Leo

314.

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 (12,332 days ago) in Ursa Major

315.

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 (12,342 days ago) in Leo

316.

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 (12,445 days ago) in Serpens Caput

317.

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 (12,476 days ago) in Cetus

318.

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 (12,496 days ago) in Coma Berenices

319.

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 (12,518 days ago) in Ursa Major

320.

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 (12,585 days ago) in Taurus