On 1981 Oct 18 UT 22:14022:16 M.Mobberley (Bury St Edmunds, UK,
14" Cassegrain, seeing variable, transparency misty) found that
the central craterlet on the floor of Plato was not visible,
despite it being visible under similar colongitudes on other
nights. Might be due to observing conditions, but observer
suspicous. At 02:08 the observer comments that the central
craterlet was ellusive, and at 02:42, though it is uncertain
whether they regarded it as suspicous still at this stage?
ALPO/BAA weight=1.
On 1891 Sep 23 at UT 22:00 Pickering, based at Arequipa, Peru, and
using a 12" reflector, saw in Schroter's Valley and the vicinity
"Varitions in vapor column. Drawings. Time estimated from given
colongitude)." Cameron 1978 catalog ID=272 and weight=1. ALPO/BAA
weight=1.
Linne 1918 Apr 04 UTC 01:00? Observed by Markov (Russia) "In place of
crater only a hill 2km in diam. was vis. (seen in dark). " NASA catalog
weight=1, low, NASA catalof ID #368. ALPO/BAA weight=1.
On 1891 Sep 25 at UT 20:00 Pickering, based at Arequipa, Peru, and
using a 12" reflector, saw in Schroter's Valley and the vicinity
"Varitions in vapor column. Time estimated from given colongitude)."
Cameron 1978 catalog ID=273 and weight=1. ALPO/BAA weight=1.
Aristarchus and Cobra Head 1968 Jul 18 UT 00:50-01:30
Observed by Moseley & Corvan (Armagh, N.Ireland, 10"
refractor, x255) and by Moore (Selsey, England, 3" refractor,
x 120) "Distinct red glow & obscur. 1st at 0050 S. of C.H. &
same size. At 0052h saw color on S.wall of Aris. Both
persisted till 0100h then both (faded, then brightened, then
faded. Plato, Gassendi & Kepler checked with neg. results.
Obscured areas reached greatest extent at 0125h wgen it was
1/2 size of C.H. & SSE (ast. ?) of it. Moore was alerted to
it & saw it in blink, but not vis. at 0107-0220". NASA
catalog weight=5. NASA catalog ID 1085. ALPO/BAA weight=4.
Southern cusp obseved by H.Hill (UK) on 1984 Jul 25. Solar
Selenographic colongitude=232.6. Observer noted a dusky ill-
defined strip in Earthshine extending beyond the southern cusp
that appeared "atmospheric". Note that this is almost certianly
not a TLP but is worth checking out if the libration and solar
colongitude is similar, just to verify that this is what the Moon
normally looks like. ALPO/BAA weight=1.
Aristarchus was extraordinarily bright. Cameron's
1978 catalog gives this TLP an ID of 34 and a weight
of 1. The ALPO/BAA catalog assigns a weight of 1 too.
South Cusp 1956 Mar 14 UT 19:00 Observed by Firsoff (Somerset, England,
5" reflector) "Twilight at S.cusp traced 640 km beyond cusp. No trace
of twilight at N. pole" NASA catalog weight=4 (good). NASA catalog ID
#635.
On 1969 Jul 17 atUT 03:00-03:25 Philips (Midland, TX, USA, 6"
reflector) "Complete rim pulsating white light, @4-5th mag.Suddenly
brightened at 0300h. Crater seemed to glow a brilliant white for @ 15m.
2 others confirmed from 0315-0325h. Resumed its normal appear. after
fading gradually at 0325h. (author (WSC) noted nothing abnormal at
0100-0115h & couldn't disting. Aris. Apollo 11 watch)". The cameron
1978 catalog ID=1152 and weight=3. The ALPO/BAA weight=3.
Mare Crisium 1973 Apr 05 UT 18:40-19:30 Observed by an unknown observer
(Hungary), Hitchens (Lincolnshire, England, 11" reflector, Seeing=poor)
and Peters (Kent, England, 8" reflector, Seeing=poor) "Saw a bright
strip that extended deep into the dark side. Did not see it in May or
June at same phases. Alignment same as E. boundary of M. Cris. Eng.
Obs. at same time noted nothing." NASA catalog weight=1 (very low).
NASA catalog ID #1364.
On 1991 Apr 17 at UT 01:22-02:37 D. Spain (Fairdale, KY, USA, 3.5"
refractor, x30-x111, S=5/10, T=5.5) observed (UT01:22-02:25) an orange
flare and some brighenings in the crater Gassendi. With the naked eye
he saw a glowing spot on the Earthshine side of the Moon. When he
turned his telescope onto this he found out that this was Gassendi
crater. By comparison, Aristarchus was just a small point. Herzog
(Racine, WI, USA, 2.5" refractor, x28, S=G and T=6-7) confirmed Spain's
observation UT 01:51-02:37?. Darling (Sun Praire, WI, USA, 3"
refractor, x56, S=7/10, T=5) did not see anything unusual UT 02:15-
02:32?. Cameron speculates that the orange colour might be from the
Moon's low altitude. The Cameron 2006 catalog ID=421 and the weight=1.
The ALPO/BAA weight=1.
Plato 1919 Mar 05 UT 17:19:17:34 Observed by Selivanov, Tartakov
(Russia, 4" refractor? x150) "Crater seemed to be an intense green in
the background of Ashen light. Slightly to the left (east?) of it's
centre a bright spot that sparkled with a phosphor. light, lighting up
the whole crater so that its W. edge could be seen. Light did not
change for the whole time." NASA catalog weight=4 (good). NASA catalog
ID #371.
On 1969 Jul 18 at UT 03:53-04:21 Tungside? (CA, USA, 8" reflector) saw
a blue flash in Aristarchus crater. Apollo 11 watch. The Cameron 1978
catalog ID=1156 and weight=3. The ALPO/BAA weight=2.
On 1969 Jul 18 at UT 04:16 Harris (Torrence, CA, 12" reflector) saw
Kraft brighten at this time. Apollo 11 watch. The Cameron 1978 catalog
ID=1156 and weight=3. The ALPO/BAA weight=2.
On 1969 Jul 18 at UT 03:53-04:21 Kohlenberger (Fullerton, CA, 4.5"
reflector), Harris and Bell (Torrence, CA, 12" reflector) saw a 65km
long limb brightneing between Grimaldi and Aristarchus, a third of the
way from Aristarchus. The Cameron 1978 catalog ID=1156 and weight=3.
The ALPO/BAA weight=1.
On 1972 Mar 18 at UT2015 E. Watkins, P. Hooks, D. Harris and R. Pieper
(Conditions bad: a lot of mist and haze in the sky, 10" (x80 and x160)
and 4.5" reflectors (x45, x150 and x225), observers were located in the
UK) Aristarchus seen on the night side of the Moon - P. Hooke saw a red
orange outburst from the ctater. When E. Watkins had a look, it just
resembled a misty white area i.e. normal. Eyepieces were changed but it
stayed misty white. Hooke was an inexperienced TLP observer at the
time. Watkins did however notice some variation in brightness but put
this down to atmospheric conditions. This is a BAA observation.
ALPO/BAA weight=1.
On 1991 Apr 18 at UT 02:00-03:02 D. Spain (Fairdale, KY, USA, 3.5"
reflector, S=6/10) could only see Aristarchus using averted viion. K.
Herzog (Racine, WI, USA, 6" refractor, x38) observed Aristarchus to
cycle through glowing and fading down to Earthshine brightness in a 3
minute cycle, but they could niot see Copernicus, Kepler or Tycho in
Earthshine. W. Dembowski (USA) obtained photographs but these did not
reveal anything unusual. The Cameron 2006 catalog ID=422 and the
weight=1. The ALPO/BAA weight=1.
On 1877 Jun 15 at UT 20:00 Birt (England, UK) observed a bright spot
east of Picard. The reason why this was regarded as a TLP, accoridng to
Cameron was that it was supposed to be faint or invisible. The Cameron
1978 catalog ID=193 and the weight=3. The ALPO/BAA weight=3.
On 1969 Jul 19 at UT 03:53-04:19 Harris (Torrence, CA, USA, 12.5"
reflector), Bell (Duarte, CA, USA, 4.5" reflector), and Miller (Ojai,
CA, USA). "Harris saw 20 brightenings or light flashes, lasting fr, 1/2
to 3s at 03:53:56 (1/2s), 03:54:19 (1s), 03:54:55 (2s), 03:55:06,
03:56:54, 03:56:56, 03:58:37, 03:59:58, 04:07:28, 04:15:00, 04:16:02,
04:16:45, 04:20:29, 04:21:14. First 4 were confirmed by Bell, Harris
also saw 100 mi(160km) long limb brightening (blue) between Aris &
Grimaldi, due W. of Aris., brighter than Aris. At 04:14 saw the
brightening 1/2 way between Aris. & Grim. as pinkish or orange. Miller
at 0417h saw a star-like pulse in W. (IAU?) rim of Grimaldi. (confirm.
of Harris'04:16:45 obs. ? Apollo 11 watch)." The Cameron 1978 catalog
ID=1161a and weight=3. The ALPO/BAA weight=3.
On 1969 Jul 19 at UT 03:53-04:19 Harris (Torrence, CA, USA, 12.5"
reflector), Bell (Duarte, CA, USA, 4.5" reflector), and Miller (Ojai,
CA, USA). "Harris saw 20 brightenings or light flashes, lasting fr, 1/2
to 3s at 03:53:56 (1/2s), 03:54:19 (1s), 03:54:55 (2s), 03:55:06,
03:56:54, 03:56:56, 03:58:37, 03:59:58, 04:07:28, 04:15:00, 04:16:02,
04:16:45, 04:20:29, 04:21:14. First 4 were confirmedby Bell, Harris
also saw 100 mi(160km) long limb brightening (blue) between Aris &
Grimaldi, due W. of Aris., brighter than Aris. At 04:14 saw the
brightening 1/2 way between Aris. & Grim. as pinkish or orange. Miller
at 0417h saw a star-like pulse in W. (IAU?) rim of Grimaldi. (confirm.
of Harris'04:16:45 obs. ? Apollo 11 watch)." The Cameron 1978 catalog
ID=1161a and weight=3. The ALPO/BAA weight=3.
Hipparchus 1972 Mar 19 UT 21:07-21:29 observed by Schnuckel (52.5N,
13.8E, 60mm refractor) "Two sudden white brightenings in the West wall
approx 7 magnitude. First was at 21:07 UT and the second was at
21:29UT. Both lasted approximately 1 sec in duration." - Hilbrecht and
Kuveler, Earth, Moon & Planets, 30 (1984), p53-61
On 1965 Aug 02 at UT 03:57-03:58 Bornhurst (Monterey Park, CA, USA,
10" reflector, x240, S=5) observed some star-like flashes in
Aristarchus in ashen light. The Cameron 1978 catalog ID=887 and the
weight=3. The ALPO/BAA weight=2.
On 1969 May 22 at UT04:28-05:06 Harris (Tucson, AZ, USA, 21"
reflector), Ricke (8" reflector), and Cameron (Greenbelt, MD, USA, 21"
reflector, x40 and x250) observed "Brightenings & pulsations. 1st per.
0428-0440h(R&H); then 0500(R). 3rd per. 0506h(H). Pulsations
intermittent & increase @ 1/2 mag. except 1 was 1-2 mag. greater.
(atmosp. ?). Cameron at 0130-0330 did not see Aris. in 12-in refl. at
40x or 250x, & saw nothing abnormal. (Apollo 10 watch)". The Cameron
1978 catalog ID=1133 and weight=1. The ALPO/BAA weight=2.
Proclus 1969 Jul 20 UT 03:55-04:15 Observed by Gergoulis, Morley,
Sevra, Skinner, and Naumann (Edinburg, TX, 17" reflector, x169) " Texas
group got a blink (red, Trident MB) on NW wall. Varied extremely.
Increased in brightness in red. Clouds stopped obs. 5 confirmed
visualy. (moon nr. horizon, Apollo 11 watch. No blink if spurious?)."
NASA catalog weight=3 (average). NASA catalog ID #1170.
Burg 1972 May 18 UT 20:50-21:45, 22:15-23:00 Observed by Moore
(Selsey, England, 12.5" reflector, x350, S=3-4), and Fitton
(Lancashire, England, 8.5" reflectpr, x200) "Suspected floor
brightening at 2050h with a luminous strip to the SW. Persisted
for sometime. Faded at 2110h & invis. at 2145h. Fitton from
2215h-2300h saw nothing unusual, (after event tho.)" NASA
catalog weight=3. NASA catalog ID #1333. ALPO/BAA weight=1.
Bright spot seen. The Cameron 1978 catalog
gives this TLP an ID No. of 36 and a weight
of 1. The ALPO/BAA catalog weight is also 1.
On 1968 Jun 01 at UT 21:00? Kozyrev (Crimea?, Soviet Union)
Gas luminescence seen in Aristarchus crater. The Cameron 1978 catalog
ID=1075 and weight=3. The ALPO/BAA weight=3.
On 1965 Aug 03 at UT 04:18-04:24 Bornhurst (Monterey Park, CA, USA,
10" reflector, x240, S=F-G) and Leasure and Emanuel (Whittier, CA, USA)
observed some star-like flashes in Aristarchus in ashen light
(confirmed). The Cameron 1978 catalog ID=888 and the weight=5. The
ALPO/BAA weight=4.
Bright point seen near Plato. A much brighter one was near
Aristarchus. Apparently seen by both Schroter and Bode.
The Cameron 1978 catalog ID=43 and weight=5. The
ALPO/BAA catalog weight=3.
Bright point 26" N of Aristarchus rim. Resembled one
near Plato but less conspicuous. The was a confirmed
observation by Schroter and Bode?
On 1965 Oct 01 at 04:00UT an unknown observer saw a TLP (feature name
not given in the Cameron catalog - nor a description or reference). The
Cameron 1978 catalog ID=897 and weight=1. The ALPO/BAA weigh=1.
On 1969 Jul 20 at UT 0530-0540 Younger and Byl (Victoria, BC, Canada,
48" reflector) saw a fuzzy brightening near Aristarchus of less than
0.5 minute of arc diameter (Apollo 11 watch). The Cameron 1978 catalog
ID=1171 and weight=4. The ALPO/BAA weight=2.
On 1877 Jun 17 at UT 21:00? Harrison (USA?) observed a light point on
the Earthlit side of the Moon. He also observed a luminous point that
could not be identified (Cameron speculates that this could be a
confirtmation of Denett's Bessel observation?). The Cameron 1978
catalog ID=195 and the weight=3. The ALPO/BAA weight=2.
Rabi Levi 1969 May 23 UT 05:28-05:35 Observed by Perez, Gay, Skinner,
Floodine (Edinburgh, TX, USA, 17" reflector) "3 small craters in it,
middle one had a blink (Trident MB --red) very bright & the NW crater
of the 3 had a dimmer blink. A few bright flashes were seen vis. by 3
obs. without the image tube, lasting 15s. Clouded out at 0525h, (alt.
of moon was very low--atm?, ? Apollo 10 watch)." NASA catalog weight=3
(average). NASA catalog ID #1140.
On 2009 Apr 01 at UT 20:00-20:30 C. Brook (PLymouth, UK,
5" refractor, x40 and x100, using red and blue gelatine
Edmund Optics filters observed that a few bright areas
in the centre of mare Crisium were brighter in red at
the start of the observing session than in blue, although
not at a higher magnification. The observation ended when
seeing worsened. The ALPO/BAA weight=2.
Bessel 1877 Jun 17 UT 22:30 Observed by Denett (England?, 2.75"
reflector) "Tho't he could detect a minute pt. of light shining out of
dark crater. (no high peaks in Bessel to catch light.)" NASA catalog
weight=3 (average). NASA catalog ID #194. ALPO/BAA weight=3.
On 1965 Aug 04 at UT 04:02-04:04 Bornhurst (Monterey Park, CA, USA,
10" reflector, x240, S=F-G) observed some star-like flashes in
Aristarchus in ashen light. The Cameron 1978 catalog ID=889 and the
weight=3. The ALPO/BAA weight=2.
On 1965 Oct 02 at 04:00UT an unknown observer saw a TLP (feature name
not given in the Cameron catalog - nor a description or reference). The
Cameron 1978 catalog ID=898 and weight=1. The ALPO/BAA weigh=1.
Theophilus 1972 May 19 UT 23:48 Theophilus observed by Ruchatz (51N
10E, 60mm refractor, T=4, S=2) "Diminution of brightness of the S wall
for a short time" - Hilbrecht and Kuveler, Earth, Moon & Planets, 30
(1984), p53-61.
Linne 1866 Dec 14 UT 20:00? Observed by Schmidt? (Athens, Greece?, 7"
refractor?) "Seen as a white spot, had been a fine black spot before as
seen by Schmidt. (Also Buckingham in Dec. 1866; also D 16,25th,27th, --
not LTP?" NASA catalog weight=0 (probably not a TLP. NASA catalog ID
146.
Piton 1960 Dec 26 ? UT 00:00? Observed by Schneller (Cleveland, OH,
USA, 8" Reflector, x53), "Red obscuration; less intense than Nov. (date
not given, but discussion suggests near SR, therefore Dec 28th most
likely date -- ancill. data given for 28th)." NASA catalog weight=3
(average). NASA catalog ID #732.
SE of Ross D 1969 May 24 UT 05:06-05:20 Observed by Harris
(Tucson, AZ, USA, 21" reflector, S=F-P) "Multiple albedo
changes, 2 bright areas vis. at 05:06, reduced at 0508h
Whittier, CA, USA, 19" refractor?) NASA catalog weight=0 (very
unreliable). NASA catalog ID #874. However a letter by Harris
states: Variable transparency - colourless bright area SE of
Ross D with variable condensation. ALPO/BAA weight=1.
Proclus 1972 Mar 22 UT 19:50-21:55 Observed by Jewitt
(Middlesex, England, 6" reflector x150, S=7, T=4), Beddoes
(England), and Moore (Selsey, England, 12.5" reflector, x250,
x460, S=E, S=F) "At 1905h noted c.p. was invis. under all
magnifications. At 2050h saw minute star-like flash @ 0.5s
duration, followed by another 10s later, & another one 10s after
that. Occurred on N. crater floor. Proc. C was vis. Was using
blink device. Beddoe saw nothing unusual from 1850-1900h (prior
to event). Moore alerted, saw nothing unusual from 2100h on
(after flash. c.p. variation similar to rep'ts by Bartlett e.g.
ID=1309." NASA catalog weight=2. NASA catalog ID 1327. ALPO/BAA
weight=1.
Theophilus 1972 May 20 UTC 19:10-19:59 Observed by Haiduk (13.25E,
52.5N, 75mm refractor) "Well visible brihtening on the SW wall" S=2, T=
3 Ref: Hilbrecht & Kuveler Moon & Planets (1984) Vol 30, pp53-61.
Atlas 1973 Apr 10 UT 18:37-19:49 Observed by Theiss (51N, 9.67E, 75mm
refractor, T=2, S=3) "N. wall of Atlas was yellow-green, several
magnifications tested with the same results" - Hilbrecht and Kuveler,
Earth, Moon & Planets, 30 (1984), p53-61
On 1991 Apr 22 at UT 02:03-02:14 D. Darling (Sun Praire, WI, USA,
12.5", x99, seeing 7/10) found, using a red and blue Moonblink
device that Atlas crater gave a blink, the dark spots inside the
crater have a dark nucleus in the blue filter. This effect was
not detected earlier that night. The Cameron 2006 catalog then
says "Atlas normal". The Cameron 2006 catalog ID=424 and the
weight=3. The ALPO/BAA weight=2.
On 1991 Apr 22 at UT 01:10-01:22 D. Darling (Sun Praire, WI, USA,
12.5", x99, seeing=7/10) observed that Piazzi-Smyth was
bright in red light but fuzzy in blue light. The Cameron 2006
catalog ID=424 and the weight=3. The ALPO/BAA weight=3.
On 1993 Mar 30 at UT19:35-21:15 J. Knott (England, UK, 8.5" reflector,
x180 and x216, seeing=II and Transparency=good) observed at 19:35 the
central peak of Alphonsus appeared to be extra bright although was
normal later, however the observer suspects that this was a contrast
related and was not confident to send out a TLP alert. The Cameron 2006
catalog ID=458a and 458b and weights=0. The ALPO/BAA weight=1.
On 1993 Mar 30 at UT 19:30 an unknown British observer (Reading, UK)
noted that the crater at the end of the Alpine valley looked unusual.
However M. Cook (Frimley, UK) also observed the feature but found
nothing unusual. The Cameron 2006 catalog ID=457 and weight=0. The
ALPO/BAA weight=1.
Torricelli B 2002 Oct 14 UT 02:58-03:43 Observed by Gray (Winnemucca,
NV, USA, 152mm refractor x114, x305, seeing Antoniadi III, transparency
good) "I was out this morning (2:58-3:43 UT, October 14, 2002)
observing Torricelli B. At 3:17 UT the west sunlit wall of the crater
brightened from an intensity (Elger Scale) of 5.0 to 9.0. In actual
terms it went from slightly less bright than the walls of Picard to as
bright as the sunlit west wall of Dionysius. This was observed at 114x
in white light, where all three craters were in the field of view
simultaneously. This event lasted less than a minute and no comparable
brightening in Dionysius or Picard was seen. The wall of Torricelli B
returned to 5.0 in brightness. I continued to observe Torricelli B in
white light until 3:43 UT, but the brightness remained at 5.0. Before
the brightening I tried blinking Torricelli with the following
combinations of filters: Wratten Red 25 and Blue 38A, Red 25 and Blue
80, and Red 25 and Schott BG38 (Blue Green). Nothing showed up more
prominently in any combination except the Red 25-Blue 38A combination,
where Torricelli B became invisible in the Blue, probably because of
the filter density. Both the Blue 80 and Schott BG 38 seemed closer in
density to the Red 25 than the Blue 38A is. I could not see any details
inside Torricelli B during this session, including the bright spot on
the NE rim." The ALPO/BAA weight=3.
On 2009 Apr 02 at UT 21:45-22:05 C. Brook (Plymouth, UK,
5" refractor, x40 and x100, using red and blue gelatine
Edmund Optics filters (rose No. 47 and blue No. 80),
transparency poor due to thick haze. seeing was excellent)
observed that that the rays that crossed Mare Cisrium from
Proclus were brighter in red light than in blue. A similar
effect was also observed, to a lesser extent south of the
Mare. Non-mare Crisium rays from Proclus did not have this effect.
The TLP was not seen at the higher magnification of x100.
The ALPO/BAA weight=2.
Ptolemeus 2020 Jul 27 UT 23:00 N. Travnik (Brazil) observed
visually for 2nd time ever (first seen back in 1970), an
effect on the floor of this crater at local lunar sunrise:
"kind of glimmering mist lifted and wafted inside the shady
hollow of the crater". Almost certainly this is a combination
of atmopsheric seeing on the narrow shadow spires, but we
would like observers to look at this visually or obtain time
sequence images to try to replicate this effect. This report
is assigned an ALPO/BAA weight of 1 for now.
On 1978 Nov 08 at UT03:00 D. Darling (Sun Praire, WI, USA,
12.5" reflector, x95, seeing 8/10) saw near Beer and
Timocharis (11W, 30N) a bright flash inside the dark area. It
appeared like a diamond twinkling in sunlight and was somewhat
dazzling to the eyes. Cameron wonders in this was a meteor?
The Cameron 2005 TLP catalog ID=39 and weight=2. This is an
ALPO observation. The ALPO/BAA weight is 3.
Ross D 1969 May 25 UT 04:34-04:38 Observed by Cross (Las Cruces, NM, USA, 6" f/17 refractor) "Bright spot adjacent to
NE segment of crater, 1.5-2" at greatest extent & much
brighter than rim of Ross D. Fuzziness here & extensive
obscur. of detail E. of Ross D (Apollo 10 watch)" NASA
catalog weight=3, NASA catalog ID #1147. ALPO/BAA weight=3.
On 1980 Oct 17 at UT18:40-19:10 G. Blair (Weir, Renfrewshire,
Scotland, UK, 22cm reflector, seeing II, transparency excellent,
no spurious colour) noticed at 18:40UT that the bright central
peak of Alphonsus was elongated. At 18:41UT, at higher power,
the central peak separated from a bright point of light,
intensity about that of a 6th magnitude star. at 18:43UT a
filter check was made of the suspect point and surrounding
regions - slightly nrighter in red. At 18:50UT intensity of
bright point reduced to equivalent of 4th magnitude star. Noted
that Earthshine was the brightest that he had ever seen it. At
19:03 UT losing the Moon behind a chimney. UT 19:10 brief
appearance, bright point still seen at 4th magnitude. 19:27UT
the Moon disappears again. 20:15UT reappearance of the Moon and
Alphonsus appeared normal. The ALPO/BAA weight=2. This is a BAA
Lunar section observation.
Plato 1952 Apr 03 UT 20:45-21:30 Observed by Wilkins and Moore
(Meudon, France, 33" x460) whilst checking up on a 1923 28"
refractor sketch by W.H. Stevenson's, thry failed to detect a
prominent floor craterlet (featured in the 1923 sketch) just
inside the W wall. They suspected an obscuration.
Interestingly the whole floor was was reported to be lacking
in detail many hours later as observed by Cragg in the USA.
NASA catalog weight=5. NASA catalog TLP ID No. #550. ALPO/BAA
weight=2.
On 1882 Feb 27 at UT 18:30-19:30 an unknown observer reported an
unusual shadow in Eudoxus. Apparently the shadow was seen to be normal
on 1882 Feb 25 at UT 20:30-20:45. The Cameron 1978 catalog ID=228 and
weight=3. Reference: Sirius Vol 15, 167, 1882. The ALPO/BAA weight=2.
Eimmart 1913 Apr 14 UT 01:00 Observed by Pickering (Mandeville,
Jamaica, 6.5" reflector) "By this date crater was clear & at an albedo
~5?. Drawings compare Jan. 16 & Aug.9, 1913." NASA catalog weight=3
(average). NASA catalog ID #344.
La Hire 1922 Nov 28 UT 22:00? Observer Wilkins (England). NASA
catalog states: "Shadow cut thru by white streak (real LTP?.
Pickering's atlas shows same phase & col. & shadow is all
dark; elong. in peaks are N-S not E-W)" 15" reflectore used.
NASA Catalog assigns a weight of 4. NASA catalog TLP ID No. #
388. ALPO/BAA weight=2.
Manilius 1972 May 22 UTC 20:10-20:40 observed by Kern (48deg 45'N, 8deg
45'E, 60mm refractor) "The SW inner wall became brighter at times" -
Hilbrecht and Kuveler, Earth, Moon & Planets, 30 (1984), p53-61.
Plato 1972 Mar 24/25 UT 20:38-00:00 Observed by M.Burton (UK,
13.5" reflector, seeing IV-V, Transparency Fair, x180) UT20:38-
20:45 floor was darker in a red filter than in a blue. UT20:47-
20:56 JS Burgess (seeing 2/5, x200, with and without filters)
found everything normal (with and without filters). UT20:00-
20:07 and 21:30-21:35 A.J. Beddoes found everything normal (with
and without filters). However at 23:10 L.Fitton suspected that
the E (IAU?) floor of Plato had a red-brown cast, but could not
be quite sure. UT23:54-00:00 M.Burton, detected the floor was
darker in red than in blue light. Burton did not detect any
colour without the use of filters on either of the two occasions
that he detecetd a blink. In view of the fact that two observers
did not detect anything, albeit not concurrently with the TLP
reports, this TLP is being given an ALPO/BAA weight of 1.
On 2009 Apr 04 at UT 20:30-20:45 C. Brook (Plymouth, UK) observed a
slight pinkish mottling on the floor of Plato. The effect was no longer
visible after 20:45UT. A telephone alert was put out to M. Cook and G.
North. The former saw no colour, but this was after the event finished.
The latter observer reported cloudy conditions. A.Cook was probably
observing at the same time as C. Brook, via a couple of remotely
controlled telescopes in Aberystwyth. The results (time lapse imagery
through narrow band filters) will be examined at a later date.
On 2009 Apr 04 at UT 21:40 M.C Cook (Mundesley, UK) after receiving a
telephone alert call, examined Plato crater. Although she did not
report C. Brook's slight mottled pink on the floor of Plato, she did
report through that the floor patches looked darker than normal,
especially in blue light and in red they were not visible at all. In
white light they were darker than normal. A.C. Cook was probably
observing at the same time via a couple of remotely controlled
telescopes in Aberystwyth. The results (time lapse imagery
through narrow band filters) will be examined at a later date.
Note that this observation was made after C. Brook said that he could
no longer see his TLP. Therefore this constitutes a different TLP
as there had been a gap of 1 hour since the last TLP report.
On 1979 Dec 29 at UT 17:45-18:20 Crick (Merchtem, Belgium, 6"
reflector, x140, seeing=III) found a violet spot in the NW inner wall.
The floor was obscured of detail on the northern half. All other
regions studied appeared normal. Observer unsure if this was a TLP or
spurious colour. Cameron 2006 catalog ID=80 and weight=3. ALPO/BAA
weight=3.
Gassendi 1979 Dec 29 UTC 20:09-22:04 - Observer: Cook (Frimley, Surrey,
UK) "Colour seen - almost certainly spurious colour and not a TLP".
ALPO/BAA weight=1.
Aristarchus 1972 May 25 UT 19:32-19:38 Observed by Leitzinger (8.75E,
48.75N, Germany, 60mm f/15 telescope T=2, S=2) "Bright point at SE wall
well visible, colour changed to orange shortly before it disappeared"
published in Hilbrecht & Kuveler (1984) Moon and Planets, Vol 30, p53-61.