261.

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 (12,116 days ago) in Coma Berenices

262.

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 (12,138 days ago) in Ursa Major

263.

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 (12,244 days ago) in Serpens Caput

264.

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 (12,275 days ago) in Cetus

265.

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 (12,295 days ago) in Coma Berenices

266.

1 Ceres at perihelion 1 Ceres passes its orbit's closest point to the Sun. Fri, 14 Sep 1990 at 15:01 EDT (12,301 days ago) in Leo

267.

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 (12,318 days ago) in Ursa Major

268.

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 (12,328 days ago) in Leo

269.

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 (12,431 days ago) in Serpens Caput

270.

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 (12,462 days ago) in Cetus

271.

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 (12,482 days ago) in Coma Berenices

272.

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 (12,504 days ago) in Ursa Major

273.

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 (12,571 days ago) in Taurus

274.

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 (12,612 days ago) in Libra

275.

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 (12,641 days ago) in Cetus

276.

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 (12,661 days ago) in Coma Berenices

277.

134340 Pluto at perihelion 134340 Pluto passes its orbit's closest point to the Sun. Tue, 05 Sep 1989 at 14:58 EDT (12,675 days ago) in Libra

278.

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 (12,684 days ago) in Ursa Major

279.

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 (12,799 days ago) in Virgo

280.

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 (12,807 days ago) in Cetus