261.

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. Sun, 14 Apr 1991 at 21:21 PDT (12,504 days ago) in Virgo

262.

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 03:15 PDT (12,511 days ago) in Cetus

263.

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 19:24 PDT (12,531 days ago) in Coma Berenices

264.

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 16:33 PDT (12,553 days ago) in Ursa Major

265.

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 06:18 PDT (12,659 days ago) in Serpens Caput

266.

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 06:41 PDT (12,690 days ago) in Cetus

267.

1 Ceres at perihelion 1 Ceres passes its orbit's closest point to the Sun. Thu, 20 Sep 1990 at 22:13 PDT (12,710 days ago) in Leo

268.

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 11:55 PDT (12,710 days ago) in Coma Berenices

269.

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 15:39 PDT (12,733 days ago) in Ursa Major

270.

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. Fri, 17 Aug 1990 at 00:06 PDT (12,744 days ago) in Leo

271.

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 03:46 PDT (12,846 days ago) in Serpens Caput

272.

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 15:36 PDT (12,877 days ago) in Cetus

273.

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 15:00 PDT (12,897 days ago) in Coma Berenices

274.

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 09:13 PDT (12,919 days ago) in Ursa Major

275.

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. Sun, 17 Dec 1989 at 03:37 PDT (12,987 days ago) in Taurus

276.

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 10:33 PDT (13,027 days ago) in Libra

277.

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 19:07 PDT (13,056 days ago) in Cetus

278.

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 07:15 PDT (13,076 days ago) in Coma Berenices

279.

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 07:24 PDT (13,099 days ago) in Ursa Major

280.

134340 Pluto at perihelion 134340 Pluto passes its orbit's closest point to the Sun. Wed, 16 Aug 1989 at 23:59 PDT (13,110 days ago) in Libra