fast UNID in LEO

While testing a 1.8/50 mm lens on the WATEC yesterday, I caught a fast moving
UNID. It showed a sudden brightness change, from mag +5.5-6.0 to +7.5, around
20:30:10 UT. It doesn't fit anything in the Space-Track catalogue or classfd.tle.

Fitting a circular orbit suggests a 63 degree inclination.

* VERY APPROXIMATE, given the short arc:

UNID 26 apr2017
1 99999U 00000X   17116.86054053 0.00000073  00000-0  50000-4 0    04
2 99999  63.0390 126.0233 0007192 337.6253  87.8147 16.09584524    02

99999 00 000X   4353 G 20170426203907022 56 75 1843235+753080 16 I+059 02
99999 00 000X   4353 G 20170426203907703 56 75 1846192+746720 16 I+055 02
99999 00 000X   4353 G 20170426203907743 56 75 1846297+746315 16 I+059 02
99999 00 000X   4353 G 20170426203907783 56 75 1846395+746142 16 I+057 02
99999 00 000X   4353 G 20170426203910702 56 75 1856265+719981 16 I+074 02
99999 00 000X   4353 G 20170426203910743 56 75 1856322+719582 16 I+073 02
99999 00 000X   4353 G 20170426203910782 56 75 1856381+719193 16 I+074 02
99999 00 000X   4353 G 20170426203910823 56 75 1856432+718939 16 I+075 02
99999 00 000X   4353 G 20170426203910863 56 75 1856497+718553 16 I+074 02
99999 00 000X   4353 G 20170426203910903 56 75 1857003+718129 16 I+074 02
99999 00 000X   4353 G 20170426203910943 56 75 1857041+717892 16 I+073 02
99999 00 000X   4353 G 20170426203910983 56 75 1857135+717451 16 I+072 02
99999 00 000X   4353 G 20170426203911022 56 75 1857163+717174 16 I+075 02
99999 00 000X   4353 G 20170426203911063 56 75 1857216+716821 16 I+072 02
99999 00 000X   4353 G 20170426203911103 56 75 1857303+716470 16 I+077 02
99999 00 000X   4353 G 20170426203911143 56 75 1857379+716127 16 I+076 02
99999 00 000X   4353 G 20170426203911183 56 75 1857407+715826 16 I+072 02
99999 00 000X   4353 G 20170426203911223 56 75 1857482+715480 16 I+076 02
99999 00 000X   4353 G 20170426203911263 56 75 1857543+715121 16 I+076 02
99999 00 000X   4353 G 20170426203911303 56 75 1858005+714762 16 I+072 02
99999 00 000X   4353 G 20170426203911343 56 75 1858110+714453 16 I+077 02
99999 00 000X   4353 G 20170426203911382 56 75 1858132+714113 16 I+076 02
99999 00 000X   4353 G 20170426203911423 56 75 1858209+713794 16 I+075 02
99999 00 000X   4353 G 20170426203911462 56 75 1858232+713413 16 I+073 02
99999 00 000X   4353 G 20170426203911503 56 75 1858293+713158 16 I+077 02
99999 00 000X   4353 G 20170426203911542 56 75 1858393+712739 16 I+076 02
99999 00 000X   4353 G 20170426203911583 56 75 1858460+712339 16 I+072 02
99999 00 000X   4353 G 20170426203911622 56 75 1858479+712124 16 I+075 02
99999 00 000X   4353 G 20170426203911663 56 75 1858564+711684 16 I+075 02
99999 00 000X   4353 G 20170426203911702 56 75 1859048+711386 16 I+072 02
99999 00 000X   4353 G 20170426203911743 56 75 1859104+711059 16 I+074 02
99999 00 000X   4353 G 20170426203911782 56 75 1859135+710660 16 I+075 02
99999 00 000X   4353 G 20170426203911823 56 75 1859181+710377 16 I+073 02
99999 00 000X   4353 G 20170426203911863 56 75 1859263+710026 16 I+073 02
99999 00 000X   4353 G 20170426203911903 56 75 1859300+709697 16 I+071 02
99999 00 000X   4353 G 20170426203911943 56 75 1859385+709386 16 I+076 02
99999 00 000X   4353 G 20170426203911983 56 75 1859419+708981 16 I+075 02
99999 00 000X   4353 G 20170426203912022 56 75 1859480+708727 16 I+072 02
99999 00 000X   4353 G 20170426203912063 56 75 1859544+708336 16 I+077 02
99999 00 000X   4353 G 20170426203912103 56 75 1900012+708040 16 I+072 02
99999 00 000X   4353 G 20170426203912143 56 75 1900066+707692 16 I+073 02
99999 00 000X   4353 G 20170426203912183 56 75 1900113+707387 16 I+074 02
99999 00 000X   4353 G 20170426203912223 56 75 1900189+707020 16 I+073 02
99999 00 000X   4353 G 20170426203912263 56 75 1900220+706722 16 I+074 02
99999 00 000X   4353 G 20170426203912303 56 75 1900313+706387 16 I+073 02
99999 00 000X   4353 G 20170426203912343 56 75 1900351+705987 16 I+075 02
99999 00 000X   4353 G 20170426203912382 56 75 1900410+705665 16 I+072 02
99999 00 000X   4353 G 20170426203912423 56 75 1900459+705373 16 I+074 02
99999 00 000X   4353 G 20170426203912462 56 75 1900513+705097 16 I+075 02
99999 00 000X   4353 G 20170426203912503 56 75 1900550+704672 16 I+072 02
99999 00 000X   4353 G 20170426203912542 56 75 1901015+704347 16 I+072 02
99999 00 000X   4353 G 20170426203912583 56 75 1901084+704046 16 I+073 02
99999 00 000X   4353 G 20170426203912622 56 75 1901123+703684 16 I+074 02
99999 00 000X   4353 G 20170426203912663 56 75 1901198+703424 16 I+076 02
99999 00 000X   4353 G 20170426203912702 56 75 1901233+703013 16 I+074 02
99999 00 000X   4353 G 20170426203912743 56 75 1901294+702767 16 I+076 02
99999 00 000X   4353 G 20170426203912782 56 75 1901332+702379 16 I+073 02
99999 00 000X   4353 G 20170426203912823 56 75 1901364+702156 16 I+074 02
99999 00 000X   4353 G 20170426203912863 56 75 1901432+701700 16 I+073 02
99999 00 000X   4353 G 20170426203912903 56 75 1901508+701400 16 I+074 02
99999 00 000X   4353 G 20170426203912943 56 75 1901535+701090 16 I+074 02
99999 00 000X   4353 G 20170426203912983 56 75 1901583+700687 16 I+072 02
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