Plato 1918 May 20 UT 18:00? Observed by Markov (Russia) "Brightness in
shadow of the light sector & 1 spot" NASA catalog weight=3 (average).
NASA catalog ID #369. ALPO/BAA weight=2.
Proclus 1970 Jul 11 UT 20:35-20:45 Observed by Dean, Jamieson,
Sparks (Ruislip, ------, England, 6" relector x156) "Dean saw
something in Proclus, alerted Jamieson who saw nothing unusual
at 2043h, but tho't Secchi was quite bright. At 2035 Sparks saw
Proc. fluctuate. Red & blue filters showed some reduction in
brightness. E. edge showed darkening, but not as dark as in
shadows. 10 min later, returned to normal. (Sparks confirmed
Dean)." NASA catalog weight=5. NASA catalog ID #1267. ALPO/BAA
weight=3.
1970 Jul 11 UT 20:35-20:45 During a TLP alert for Proclus, Jamieson
saw nothing unusual, but found instead that Secchi was quite bright.
NASA catalog weight=5 (very good). NASA catalog ID #1267. ALPO/BAA
weight=1.
SW of Pico 1844 Apr 25 UT 20:00? Observed by Schmidt (Athens,
Greece, ? refractor) "A bluish glimmering patch of light not
quite within the dark side" NASA catalog weight=4. NASA
catalog ID #123. ALPO/BAA weight=3.
Purbach 1970 Apr 14 UT 12:00-14:00 Observed by Osawa (Awajt-Shima,
Japan, 8" reflector, x288) "Photos in blue and orange taken. Ill-
defined obscur. in blue photo in S. part of crater compared with
orange. (neg. is so faint it is doubtful. Apollo 13 watch. Similar to
Alter's findings in Alphonsus)." NASA catalog weight=2 (low). NASA
catalog ID #1250.
On 1975 Mar 23 at UT 20:40 P.W. Foley (Kent, UK) found a brownish
colour on the north west wall. This is a BAA Lunar Section report. The
ALPO/BAA weight=2.
On 1994 Apr 23 at UT02:41 D. Fryback (Madison, WI, USA) observed a
starlike flash in Alphonsus crater. The ALPO/BAA weight=2.
On 1994 Apr 23 at UT 03:30 the US Navy Clementine Spacecraft, in orbit
around the Moon, obtained images of the Cobra Head region of
Aristarchus crater that suggested a ~15x colour ratio increase (0.4
microns / 1.0 microns) in comparison with images obtained on 1994 Mar
03. This was presented as a poster paper 18.04 at AAS 31st DPS meeting.
However it was later suggested that this was due to incorrect
radimetric calibration procedures being followed. The ALPO/BAA
weight=1.
Aristarchus 1965 Nov 06 UTC 03:20-03:50, 05:50 Observed by Bartlett
(Baltimore, MD, USA, 3" refractor x300, S=6, T=5) "Strong blue-viol.
glare on E. & NE wall; dark viol. hue in nimbus. (absent at 0320-0350.
Listed as 11/8/55 in both ref. 210 & MBMW, but should be 1965). NASA
catalog weight=4, NASA catalog ID #911.
On 1989 Jun 17 at UT 06:33-07:16 R. Manske (Sun Prairie, WI, USA, 1"
refractor) sketched a nebulous spot near to Herodotus crater that at
06:49 (when he tried some filters out) was visile through red, blue and
yellow filters, though it was slightly fainter through the red filter.
The Cameron 2006 catalog ID=366 and the weight=3. The ALPO/BAA weight=2.
Aristarchus 1963 Oct 30 UTC 22:00? Scarfe (Cambridge, UK)
observed a 30% enhancement at 540nm in the spectra of
Aristarchus. The Cameron 1978 catalog ID No. is 778 and weight
is 5. The ALPO/BAA weight=1 because Oct 30 is not mentioned in
Cameron's refernce.
In 1963 Oct 30 UT 22:00? Scarfe (Cambridge, UK) observed a
30% enhancement at 540nm in the spectra of Copernicus. The
Cameron 1978 catalog ID No. is 778 and weight is 5. The
ALPO/BAA weight=1 because Oct 30 is not mentioned in the ref
that Cameron give's to Scarfe's paper.
On 1981 Nov 10 at UT 07:54-08:22 D. Louderback (South Bend, WA, USA,
3" refractor and filters, seeing=2-3 and transparency=5) observed a
blue light at the Cobra's Head, near Aristarchus, that fell back down
to a normal brightness of 7. although the west wall (his point D) went
down to 6.5 (this was 8 back on Oct 5). The Cameron 2006 catalog ID=158
and the weight=3. The ALPO/BAA weight=2.
Aristarchus 1966 Jun 03 UT 01:00-01:45 Observed by Gordon (2), Delano
(Ackerman, PR?, 5" reflector / Massachussets, 3" (x92) & 10" reflector
T=4) "Deep blue color on N. wall. S.part of crater was brownish, (not
on alert). Delano saw E.wall bright spot unusually bright, confirm, ?"
NASA catalog weight=5. NASA catalog ID #947. ALPO/BAA weight=3.
On 1983 Oct 20 at UT23:40 P. Moore (Selsey, UK) observed that
Aristarchus was brighter than normal (as measured with a CED) and much
more so that Censorinus, Menelaus, and Proclus craters (in turn).
Cameron comments that Moore is a very experienced observer. The
Cameron 2006 catalog ID=231 and the weight=4. The ALPO/BAA weight=2.
Aristarchus 1973 Jun 15 UT 06:12-06:21 Observed by Bartlett (Baltimore,
MD, USA, 3" refractor x54, x100, x300, x360, S=3, T=3) "Pinkinsh-red
glow on F., wall -- weher he usually sees the violet glare. (TLP
albedo=7?, normal=5?, nearby plain=1?). All along rim nr. crest & went
over EWBS. Wanted to compare a bright spot on Lyell with Aris. wall
brighteness. At 0612h pink glow changed to a rust-brown, fading rapidly
& gone at 0615h. First time he had ever obs. a red glow. (in 20 yrs)."
NASA catalog weight=4 (high). NASA catalog ID #1369.
Timocharis 1955 Jun 4-5 UT 23:30-00:00 Observed by Firsoff (Somerset,
England, 5" reflector x70, seeing=poor) "Bright in red filter" NASA
catalog weight=4 (high). NASA catalog ID #595.
On 1977 Mar 04 at UT 20:55-21:18 JH Robinson (Teighmouth, Devon, UK,
26cm reflector, x200, Wratten 25 and 44a filters, seeing steady,
transparency varies from fair to very poor and cloud eventually halted
observations). Copernicus was very indistinct. All other features
examined were normal. This is a BAA Lunar Section observation. ALPO/BAA
weight=2.
On 1977 Mar 04 at UT 20:55-21:18 JH Robinson (Teighmouth, Devon, UK,
26cm reflector, x200, Wratten 25 and 44a filters, seeing steady,
transparency varies from fair to very poor and cloud eventually halted
observations). The floor of Fracastorius is significantly brighter in a
red filter than in a blue filter. This is a BAA Lunar Section
observation. ALPO/BAA weight=1.
On 1975 Mar 27 at UT22:30-01:45 P.W. Foley (Wilmington, Dartford, Kent,
UK, 30cm Newtownian) observed blueness along the inner southern wall of
Plato, though the centre of the activity was offset on one side. This
is a BAA report. The ALPO/BAA weight=1.
Plato 1944 Sep 03 UTC 03:40 - A.W. Mount (Fort Worth, TX, USA,
Conditions good, seeing 6/10) saw a small white bright point of
light appear suddenly close to the W. wall of Plato glowed
briefly as by far the most conspicuous object in the lunar field
of view and vanished quickly after approximately 2 sec. It was
star-like in appearance and was stationary on the Moon's surface
- about magnitude 6? Angular diameter of the flash was <= 1".
Observing conditions good enough to see the central craterlet in
Plato. 20cm reflector used. Ref. DJALPO Vol 45, p28 Spring 2003.
On 1893 Sep 25 at UT 21:00? Gaboreau (Paris, France), saw a shaft
of light projecting from the Moon. Cameron 1978 catalog ID=281
and weight=0. ALPO/BAA weight=1.
40.5W, 45.7N 1965 Nov 09 UTC 04:59 Observed by McCord (Mt Wilson, CA,
USA, 60" reflector + spectrograph) "Line depth anomaly, low compared
with 23 other areas". NASA catalog weight=5 (very high). NASA catalog
ID #912.
On 1980 Sep 24 at UT 21:13-23:50 P.Moore (Selsey, UK) at 22:45 saw loss
of detail in the north west wall, especially in red light, but also
slightly in blue light too. By 22:48 there was activity on the crater
floor i.e. the four bright spots were visible in white light but not in
red. In blue the central spot was seen and there were dark radial
streaks to the south wall and south east. At 22:50 there was a loss of
detail. Other craters were normal. At 23:08 the floor was dark in red,
but some details were visible in blue. the effect had finished by
23:35. At21:34 J-H Robinson found Plato to be normal and no blinks,
though floor clearer in red than in blue, however the floor detail had
gone by 21:57. Blair suspected a dusty patch in north of Plato,
especially in red light. at 21:57 and it started spreading at 21:13,
then east at 21:15 and then north. Though it faded at 21:25 but was
back again at 21:35, and Moon blink colour filters still gave a
reaction at 21:50 - the TLP remained strong until 23:50UT. The Cameron
2006 catalog ID=110 and weight=5. The ALPO/BAA weight=4.
On 1980 Sep 24 at UT21:34 J-J. Robinson (Teighmouth, Devon, UK, 10"
reflector, x200, seeing=III) found, using a Moon Blink device, that
Fracastorius blinked on the northern side in the red filter. Cameron
2006 catalog ID=110 and weight=5. ALPO/BAA weight=3.
Aristarchus 1983 Oct 22 UT 22:00 G.W. Amery, (Reading, UK, Seeing
III-IV) found Aristrachus so bright that the CED was unable to
give a reading. The crater's interior was also diffuse in
appearance. The Cameron 2008 catalog ID=232 and weight=4. The
ALPO/BAA weight=3.
Aristarchus 1969 May 03 UTC 07:00? Observed by Smith, Gallivan
(Corralitos Observatory, Organ Pass, NM, 24" reflector, photos) "Bluing
around crater. Visible on monitor, but immeasurable in photos" NASA
catalog weight=5. NASA catalog ID #1125
On 1980 Sep 25 atUT 20:20-22:14 P. Moore (Selsey, UK, 15"? reflector,
seeing=III) found that Mons Pico was bright and had a reddish glow to
its south west. The Cameron 2006 catalog ID=111 and weight=0. The
ALPO/BAA weight=1.
On 1980 Sep 25 at UT20:20-22:14 P. Moore (Selsey, UK) noticed that the
central craterlet was more visible in red than in blue. There was also
a streak on the floor that was "shifted to S & W." The floor was dark
and Mons Pico was bright. Peters found Plato's floor (and central
craterlet) to be dark, and darker in blue than in red, however he was
suffereing from spurious colour at his observing site. Cameron 2006
catalog ID=111 and weight=0. ALPO/BAA weight=1.
On 1980 Sep 25 at UT 20:20-22:14 Peters (Kent,UK, x240 and x120,
seeing=III) observed Proclus to have an orange tint, however there was
a lot of spurious colour in the area. The Cameron 1978 catalog ID=111
and weight=0. The ALPO/BAA weight=1.
On 1956 Dec 19 at UT 00:00? an unknown observer apparently saw a TLP
somewhere on the Moon. Cameron gives the reference for this as an
unnamed AGU meeting. The Cameron 1978 catalog ID=659 and weight=0. The
ALPO/BAA weight=1.
2004 Aug 31 UT 22:30-22:35 C. Brook (Plymouth, UK) looked at Gassendi
and noted a slight chestnut brown colouration in the dark area on the
crater floor to the north of the central mountain leading to Gassendi
A. It lasted for about two minutes during 22-30 hrs UT to about 22-35
hrs UT (observer unable be more precise). Used 60mm OG x120. Seeing
quite steady trans good. Checked Gassendi again at 23hrs UT to 23-05.
No sign of colour. Also area mentioned earlier seemed lighter now. No
colour on Aristarchus. Plato floor dark -no sign of craterlets. Seeing
good with just slight tremor. Trans good 60mm OG x120 used. The
ALPO/BAA weight=2.
On 1977 Oct 28 UT 19:25 V.M. Chernov (Soviet Union) observed that
Copernicus was brighter than normal i.e. brighter than Kepler but less
bright than Aristarchus. In January and February 1977 both Copernicus
and Kepler were of the same brightness. The ALPO/BAA weight=1.
Plato 1869 Aug 23/24? UTC 23:00-01:00? Observed by Gledhill? (Halifax,
England, 9" refractor) Group I of craterlets (as designated by several
famous obs. before) exhibited notable illumination, accompanied by a
single light on a distinct spot. (if obs. similar to Ap 1870 obs. then
date =Au 23-24). NASA catalog weight=2 (low). NASA catalog ID #162.
On 1975 Dec ?? at 19:00UT P.W.Foley (Kent, UK), and possibly P. Moore?
(Selsey, UK) - unusual events were reported which might have been due
to minor structral changes. Albedo=76% (=7.6?). Cameron 1978 catalog
ID=1425 and weight=3. ALPO/BAA weight=1.
On 1988 Jul 31 at UT 07:09-08:10 D. Darling (Sun Prairie, WI, USA,
12.5"reflector, seeing=7/10 and T=3) did not detect the dark region on
the south east floor of Proclus (the TLP from a few days earlier), but
did see 2 "linear mounds". The Cameron 2006 catalog ID=335 and the
weight=0. The ALPO/BAA weight=1.
On 2011 Jan 21 at 22:30UT N.Longshaw (UK, 4" Achromatic
refractor, x128 & x160, Seeing III, transparancy average)
suspected on the eastern edge of Geminus, on the border of the
crater filled shadow and the eastern illuminated rim, a
brownish, almost speia hue. This extended for a short distance
from the floor shadow into the illuminated rim width and spanned
from the north to the south of the crater. For a comparison,
Cleomedes was checked but nothing unusual was noticed in its
shadow. The observer notes that Elger also saw a warm brown or
sepia tone. ALPO/BAA weight=1.
On 2013 Dec 19 N. Longshaw (Oldham, UK, Seeing III, TAK FS 78
APO Refracror) observed a diffuse area east of the central
peak of Geminus, to be sepia/brownish tint. The ALPO/BAA
weight=3.
On 1959 Nov 17 at Ut 22:00 an unnamed observer saw a light in Plato.
The Cameron 1978 catalog ID=725 and weight=1. The ALPO/BAA weight=1.
On 1966 Nov 11 at UT05:55-1000 Hall and Johnson (Port Tabacoo, MD, 16"
x400, S=VG), Nordling (MD, USA), Genatt (Greenbelt, MD, USA, 6"
refractor, x50, 20" reflector x400) and Wagman (Pittsburgh, PA, 30"
refractor) observed the folloowing on Aristarchus: "Color ob c.p.
detected with Trident MB, not seen vis. at Port Tobacoo. Network
alerted & 6 responded. 4 did not see anything unusual; 2 others did &
saw red on c.p. in 6-in refr., but not in 20-in refl. at 400x; other
saw indistinctness. Port Taboacoo obs. took 5 rolls of film in blue &
red & neutral. Phenom. not detectable on them, but focus poor. Blue
images had most detail, whereas would expect red or neutral to. Phenom.
still present at dawn in Moon Blink device". The Cameron 1978 catalog
ID=914 and weight=5. The ALPO/BAA weight=5.
On 1993 Dec 31 at UT 05:00-07:40 S. Beaumont (Cambridge, UK, 12"
reflector) "saw a patch of hazy light to NW (from c.p. alpha) at 0550
craters B & J shadow of alpha had not reached E wall yet, but at 0536
it did. Alpha > at 0550. Craters B & J to SE had faded, vanished at
0630. Hazy patch remained around peak, alpha low mainly to NE like a
comet's tail. Slightly reddish fringe to E wall. (shown in sketch)".
The above has been quoted in full from the Cmeron catalog because the
catalog desription is slightly ambiguous and any attempted summary
might make the description more unreliable. The cameron 2006 catalog
ID=470 and the weight=3. The ALPO/BAA weight=2.
On 1992 May 20 at UT 11:15 D. Weier (Sun Prairie, WI, USA,
naked eye and 7x50 binouculars, sky conditions excellent)
noted that Aristarchus and, an area, were very bright to the
eye. In binoculars the feature was quite sharp and distinct,
"> anything else on the Moon". When observing please try using
your eyes alone and then a small aperture and low
magnification. The Cameron 2006 catalog ID=447
and the weight=2. The ALPO/BAA weight=1.
Proclus 2001 Nov 04 UTC 07:00-07:43 "Robin Gray of Winneucca, Nevada,
U.S.A. reported a contrast effect and brightening in the crater
Proclus. Using a 15.2 cm refractor he conducted a Moon blink search
with Wratten 25a and 38a blue filters. His report goes as follows:
Moon Blink carried out. In Red 25 Proclus looked nearly the
same as in white light. Through the Blue 38a filter, however, only the
brilliant lit south east wall was clearly visible. The northeast wall
was very dim with this filter. With no filters the NE and SE wall were
brilliantly lit, the SE wall was almost as bright as Aristarchus. A
thread like strip along the NW wall, possibly the rim of the crater,
was also brilliantly illuminated. The interior of the crater was a
featureless stygian black with the exception of a brilliant (intensity
9) thread of light that ran parallel to the illuminated east wall.
Whether this was an L.T.P. or an optical effect of atmospheric
turbulence is unknown, did not see anything similar elsewhere along the
terminator though" ALPO/BAA weight=3.
On 1980 Aug 29 at UT07:32 D. Loudernack (South Bend, WA, USA, 8"
reflector, x140) found the south wall to have a broad dark band (only
visible in red light) at its base that covered nearly all of the
southern half of the crater. The brightness reading was 8.4 (in blue
light) and 4 (in red light). Cameron 2006 catalog ID=107 and weight=3.
ALPO/BAA weight=3.
Plato 1877 Jul 29 UTC 02:00?-02:30 Observed by Gray (England?) "S. of
crater a bright streak that disappeared at 0230" NASA catalog weight=3
(average). NASA catalog ID #196.
In 1937 Apr 29 at UT 09:30 Firsoff (Glastonbury, UK, 6" reflector and
filters) observed a slight greenish colour (Cameron says colour of
ground? no TLP?). The Cameron 1978 catalog ID=420 and Weight=4. The
ALPO/BAA weight=3.
On 1958 Nov 01 at UT 00:00 a TLP was seen on the Moon (location and
observer not given). The Reference for this is Palm, 1967. The Cameron
1978 catalog ID=702 and weight=0. The ALPO/BAA weight=1.
1999 Jan 07 UT 01:57 C. Brook (Plymouth UK, 65mm refractor,
x125, seeing good) found this mountain unusually dull. In
contrast, Mons Pico, Montes Teneriffe, Montes Spitzenberg,
were all normal. ALPO/BAA weight=1.
Theophilus 1965 Jul 18 UTC 08:52-09:01 Observed by Cross, Ariola
(Whittler, CA, USA, 19" reflector, x450, S=4, T=3) "Red spots;
ruby red within a pink area on c.p." NASA catalog weight=5. NASA
catalog ID #885. ALPO/BAA weight=4.
On 1980 Aug 31 at UT 08:00? D. Louderback (South bend, WA,
USA, 8" refletor x140) found the north wall to be very bright
in red light (this is not normal as it is usually bright in
blue - according to Cameron). The brightness was 9.7 (red) and
9 (blue no filter)compared to Eimmart's 8.7. Louderback
thought that they observed an orange-yellow tinge. Cameron
2006 catalog ID=108 and weight=3. ALPO/BAA weoght=2.
Triensecker Rille 1915 Jul 03 UTC 00:00? Observed by Markov (Russia)
"Several spots changed their shapes compared with Gordeenko's depiction
on 5/23/12 see #339; which cannot be explained by light variations."
NASA catalog weight=3. NASA catalog ID #356.
Aristarchus 1965 Nov 15 UTC 05:55-10:00 Observed by Hall, Johnson,
Nordling (Pt. Tobacco, MD, USA, 16" reflector x400), Genatt (Greenbelt,
MD, USA, 6" refractor, x50 & 20" reflector x400), Wagmann (Pittsburgh,
PA, 30" refractor). "Color on c.p. detected with Trident MB, not seen
vis. at Port Tobacco. Network alerted & 6 responded. 4 did not see
anything unusual; 2 others did & saw red on c.p. in 6-in refr.. but not
in 20-in refl. at 400x; other saw indistinctness. Port Tobacco obs.
took 5 rolls of film in blue & red & neutral. Phenom. not detectable on
them, but focus was poor. Blue image had most detail, whereas would
expect red or neutral to. Phenom. still present at dawn in Moon Blink
device." NASA catalog weight=5. NASA catalog ID #914.
ALPO/BAA weight=4.
On 1982 Aug 11 at UT03:30-04:15 Mobberley (Suffolk, UK) obtained a
photograph and made a sketch that revealed a needle-like shadow from
the west wall to near by the central craterlet - the latter was quite
clearly visible. What were not visible were the other four craterlets.
The Cameron 2006 catalog ID=183 and weight=4. The ALPO/BAA weight=2.
Alphonsus 1958 Nov 03 UT 02:30-03:30 Observed by Kozyrev,
Ezerski (Pulkova Observatory, Crimea, Ukraine, 50" reflector,
23A/mm spectrograph) UT03:00-03:30 "C.p. redder than rest;
emiss. spect. in 4756A, 4100, 3950A (C3), 5165, 5130A (Swann
bands) 3 spect. over 3.5 h. Image of c.p. weakened in viol.
light on spect. Noted visual decrease in brightness & reddish
glow. Decrease in bright, & unnusual white color(at 0300h-
0330h). Sudden decrease in vis. bright. Spect. started --
gave norm. Spect. (0330-0340h), conditions almost identical to
Alter's on Oct. 26, 1956. Nothing seen on Nov. 2-3" NASA catalog
weight=5. NASA catalog ID #703. ALPO/BAA weight=5.
Aristarchus 1978 Oct 23 UT 06:30-06:34 V.A. Sage (Bristol, UK,
10.25" reflector, x250, Wratten 44a and 25, seeing II) noted
that Aristarchus was surrounded by a dark area in the blue
filter. They did not regard this as a TLP at the time. However
because Aristarchus is surrounded by blue material in real life,
this should have been brighter? For this reason, despite the
observer regarding this as a negative TLP, an ALPO/BAA weight=1
has been applied.
On 1981 Dec 19 at UT 01:00-05:00 E.V. Arsyukhin (Moscow, Russia, 3"
reflector) observed that Plato was consdierably brighter than
Aristarchus by several times. The image quality was very clear. The
Cameron 2006 catalog ID=161 and weight=3. The ALPO/BAA weight=2.
On 1977 Nov 03 at 22:13UT P.W. Foley (Kent, UK, 11" reflector, x285)saw
some flickering in Gassendi (Clouds on limb - according to Csmeron?).
The Cameron 1978 catalog ID=18 and weight=1. The ALPO/BAA weight=1.
On 1979 Sep 15 at UT01:53 P.Madej (Newsome, Huddersfield, UK,
158mm reflector, x72 and x110, seeing II, transparency fair?)
saw a small circular area of grey or white in the dark south end
of Copernicus.The area showed up better through a Wratten 15
yellow filter, but was not seen at all through a purple Wratten
35 filter. P.W. Foley (Kent, UK), confirmed this but thinks that
it is normal. Cameron 2006 catalog ID=68 and weight=1. ALPO/BAA
weight=1.
On 1963 Nov 11 at 23:30UT Jacobs (Flagstaff, AZ, USA, 24" refractor,
seeing=very good) observed a reddish-orange colour in Aristarchus
crater and a sparkle in some areas. The Cameron 1978 catalog weight=3.
The ALPO/BAA weight=3
On 1982 Nov 11 at UT 17:00-17:30 E.V. Arsyukhin (Moscow, Russia, 3"
reflector) saw three stationary dark spots suddenly appear in Mare
Crisium. There was one on the north and the other two in the south west
to south. They lasted approximately 30 minutes and then promptly
vanished. Cameron says that it cannot be this date because the Moon was
not visible at 17:00UT Suggests 05:00-05:30UT? The Cameron 2006 catalog
ID ID=189 and weight=3. The ALPO/BAA weight=2.
On 1971 Feb 22 at UT 02:47-16:38 an Apollo ALSEP experiment
detected an initial gas event in Fra Mauro. Sharp 4 second
rise time, 1 hour delay time with 10 times increase in
intensity. Molecular weight was between 14 and 20. Could have
been Ne, Fl, O or H2O - the latter was thought best by
Freeman. Duration of event 13 hours. The Cameron 1978 catalog
ID-1284 and weight=5. The ALPO/BAA weight=5.
On 1986 May 05 G. North (Herstmonceux, Sussex, UK, 30" reflector) found
that the crater (floor?) Plato was featureless, even during the better
moments of atmospheric seeing conditions. A spectra was taken but
nothing unusual was seen. The Cameron 2006 catalog ID=284 and the
weight=1. The ALPO/BAA weight=1.
In 1919 Dec 19 at UT 04:00 Scholes (Huddersfield, England? USA)
observed near Littrow a conspicuous ink-black mark (North of Cape
Argaeus or S of Kittrow, The Cameron 1978 catalog ID=374 and the
weight=1. The ALPO/BAA weight=1.