The visual observers who contributed to the chasing of the phenomenon are given as follows:
Id= ISHADOH (31 cm spec), Iw= IWASAKI (21 cm spec), Mk= MURAKAMI (20 cm spec), Mn= MINAMI (20 cm refr), Nj= NAKAJIMA (20 cm refr);The photo-image observers are as follows:
Ak= AKUTSU (cooled CCD, 32 cm spec), Hg= HIGA (CCD Video, 25 cm spec), Mo= MORITA (blue by TP2415, 25 cm spec) and Mt= MATSU- MOTO (Fujicolor SGA400, 40 cm spec).
5 May 1999 (134°Ls) Nj-260D LCM=201°W misted Mn-480D LCM=205°W misty, lighter than the npc Nj-261D LCM=210°W misty also thru G Mn-481D LCM=215°W as white as the npc Nj-262D LCM=220°W misty Mn-482D LCM=225°W still thick Mo- B LCM=226°W thickly misty near the npc Nj-263D LCM=230°W faint Mn-483D LCM=235°W fainter Nj-264D LCM=240°W not evident Mn-484D LCM=244°W mist not explicit Mt-021C LCM=248°W white haze inside Utopia Nj-265D LCM=249°W weak Mt-022C LCM=252°W same as Mt-021C Mn-485D LCM=254°W just a haze following the npc Nj-266D LCM=259°W not evident Mn-486D LCM=264°W Utopia looks normal 6 May 1999 (135°Ls) Nj-269D LCM=182°W invisible Mn-492D LCM=187°W morning mist coming dull Ak- CCD LCM=192°W invisible Nj-270D LCM=192°W whitish bright Mn-493D LCM=197°W thick limb patch Nj-271D LCM=202°W whitish bright Mn-494D LCM=206°W invaded deeply by the mist Nj-272D LCM=211°W whitish bright, doubled Mn-495D LCM=216°W having a core blue-whiter Nj-273D LCM=221°W cores doubled seen thru G Ak- CCD LCM=224°W a bit seen, faint Mn-496D LCM=226°W a bar appearing Mk-128D LCM=228°W mist's Intensity 2.5 Nj-274D LCM=231°W vaguely cored mist Mn-497D LCM=236°W cloudy belt appears Mk-129D LCM=238°W mists doubled Nj-275D LCM=241°W Utopia partly misty Ak- CCD LCM=245°W not descriptive Mn-498D LCM=245°W becoming white WE-belt Mo- B LCM=246°W faintly misty Mk-130D LCM=248°W Utopia outside morning mist Nj-276D LCM=251°W mist complexed inside Utopia Mn-499D LCM=254°W white and light WE-belt Mk-131D LCM=258°W mist not evident Mo- B LCM=261°W faint Mn-500D LCM=264°W blurred now 7 May 1999 (135°Ls) Mn-505D LCM=188°W terminator is a bit hazy Mn-506D LCM=195°W weak yet Nj-277D LCM=200°W misty limb patch Mn-507D LCM=205°W Utopia followed by a haze Ak- CCD LCM=208°W faintly seen Nj-278D LCM=210°W light along the terminator Ak- CCD LCM=213°W distinctly terminator patch Mn-508D LCM=215°W usual Utopia misted Hg- VTR LCM=217°W white terminator mist patch Nj-279D LCM=220°W Utopia misted Mk-132D LCM=224°W mist not evident Mn-509D LCM=224°W thick, white Hg- VTR LCM=226°W same as at LCM=217°W Nj-280D LCM=229°W light belt along the terminator Mo- B LCM=231°W faint Ak- CCD LCM=231°W blurred Mk-133D LCM=234°W morning terminator mist Mn-510D LCM=234°W larger and weaker Hg- VTR LCM=236°W became larger and diffused Nj-281D LCM=239°W just terminator misty light Mo- B LCM=246°W faintly light near the terminator Mn-511D LCM=244°W Utopia normal followed by mist Hg- VTR LCM=246°W much diffused Ak- CCD LCM=249°W terminator just misty Nj-282D LCM=249°W Utopia outside the m mist Mn-512D LCM=254°W morning misty outside Utopia 8 May 1999 (136°Ls) Mn-518D LCM=177°W none Nj-289D LCM=182°W morning mist coming Mn-519D LCM=186°W terminator blue-whitish mist Nj-290D LCM=191°W misty Mn-520D LCM=196°W larger blue-white mist Mo- B LCM=197°W patch near the terminator Nj-291D LCM=201°W same as Nj-290D Mo- B LCM=204°W same as LCM=197°W Mn-521D LCM=206°W mist invades Utopia Nj-292D LCM=211°W mist patch inside Utopia Mk-134D LCM=213°W morning core at Int 3 Mo- B LCM=204°W same as LCM=204°W Mn-522D LCM=216°W dark spot near the terminator Ak- CCD LCM=219°W mist patch clearly seen Nj-293D LCM=221°W connected with the m mist Mk-135D LCM=223°W blue-whitish mist at Int 3.5 Mn-523D LCM=225°W greenish-white mist Mo- B LCM=226°W weaker Nj-294D LCM=230°W same as Nj-293D Hg- VTR LCM=232°W large and whitish light Mk-136D LCM=233°W invades the inside of Utopia Mn-524D LCM=235°W mist over Utopia bluish Ak- CCD LCM=237°W thick and clear Mo- B LCM=239°W weakly visible Nj-295D LCM=240°W mist invisible Hg- VTR LCM=241°W more inside Mk-137D LCM=243°W morning terminator mist only Mn-525D LCM=245°W normal though still misted Mo- B LCM=246°W weak near the terminator Nj-296D LCM=250°W mist invisible Hg- VTR LCM=251°W weaker but present Mk-138D LCM=252°W mist patch at Int 3 Mn-526D LCM=255°W mist is not so explicit Ak- CCD LCM=263°W invisible 9 May 1999 (136°Ls) Nj-299D LCM=163°W none Mn-529D LCM=168°W none Nj-300D LCM=173°W terminator misty Mn-530D LCM=178°W already mist apparent Nj-301D LCM=183°W mist thick Mn-531D LCM=187°W thick, blue-whitish Nj-302D LCM=192°W bright mist Mn-532D LCM=197°W brighter and larger Nj-303D LCM=202°W same as Nj-532D Mn-533D LCM=207°W still compact Nj-304D LCM=212°W still bright Mn-534D LCM=217°W weaker than the npc Mn-535D LCM=231°W still visible 10 May 1999 (137°Ls) Iw-067D LCM=188°W light patch near the terminator Mo- B LCM=196°W light patch near the terminator Iw-068D LCM=198°W patch more inside Mo- B LCM=207°W patch is very bright Iw-069D LCM=208°W same as Iw-068D Mo- B LCM=215°W patch is still visible Mo- B LCM=227°W slightly diffused 11 May 1999 (137°Ls) Ak- CCD LCM=161°W not visible Nj-307D LCM=162°W mist patch is visible Mn-540D LCM=167°W faintly misty Nj-308D LCM=172°W dull light Mo- B LCM=175°W looks diffused Mn-541D LCM=177°W bright spot near the terminator Iw-070D LCM=179°W light spot near the terminator Nj-309D LCM=182°W misty Mo- B LCM=184°W misty condensed Mn-542D LCM=187°W very thick and bright mist Iw-071D LCM=189°W same as Id-070D Nj-310D LCM=192°W mist clear and light Mo- B LCM=194°W much condensed core Mn-543D LCM=197°W still thick and dense Iw-072D LCM=199°W light patch Nj-311D LCM=201°W seen thru G Mn-544D LCM=206°W dull thick Mo- B LCM=210°W same as LCM=194°W Nj-312D LCM=211°W larger, seen thru G Mn-545D LCM=216°W largely covers Nj-313D LCM=221°W core thru G near the terminator Mn-546D LCM=226°W weaker and blue-whitish 12 May 1999 (138°Ls) Mn-550D LCM=139°W already a morning mist Mn-551D LCM=149°W developped Mn-552D LCM=159°W remains the same Mo- B LCM=160°W looks diffused Nj-317D LCM=163°W mist quite apparent Ak- CCD LCM=164°W faint Mn-553D LCM=168°W quite whitish bright Iw-073D LCM=171°W light patch Mk-139D LCM=173°W a white patch Nj-318D LCM=173°W white patch larger Mo- B LCM=174°W diffused Ak- CCD LCM=176°W clearly visible Mn-554D LCM=178°W same as Mn-553D Iw-074D LCM=180°W patch more evident Mo- B LCM=181°W blurred Mk-140D LCM=183°W larger than the one in Mk-139D Nj-319D LCM=183°W large Ak- CCD LCM=188°W a blurred white patch Mn-555D LCM=188°W blue-white, not glossy Iw-075D LCM=190°W remains the same as Iw-074D Mo- B LCM=193°W condensed Mk-141D LCM=193°W diffused than in Mk-140D Mn-556D LCM=198°W same as Mn-555D Ak- CCD LCM=205°W clear patch near the terminator Mo- B LCM=206°W condensed, but weaker Mn-557D LCM=207°W retreated Mn-558D LCM=217°W quite misted? (not detailed) 13 May 1999 (138°Ls) Mn-560D LCM=138°W a bit Mo- B LCM=144°W faint Ak- CCD LCM=145°W not visible (poor seeing) Mn-561D LCM=147°W not so evident Nj-323D LCM=152°W mist core appearing Mn-562D LCM=157°W vague Mk-142D LCM=161°W a patch near the terminator Nj-324D LCM=162°W still near the terminator Ak- CCD LCM=163°W faint Mn-563D LCM=167°W not evident Mk-143D LCM=172°W a light patch Nj-325D LCM=172°W whitish bright Mo- B LCM=177°W diffused mist Mn-564D LCM=177°W dull whitish Id-063D LCM=179°W a light misty slit coming Mo- B LCM=182°W diffused core Nj-326D LCM=182°W largely light Mn-565D LCM=186°W thicker, blue-whitish Mo- B LCM=187°W diffused but evident Id-064D LCM=189°W same as in Id-063D Mn-566D LCM=196°W thick, but weaker than the npc Id-064D LCM=198°W diffused than before Mn-567D LCM=206°W diffused, largely misted? Id-066D LCM=210°W much diffused