On 1821 Feb 06 at UT 18:00-19:00 At 18:00UT H. Kater (London, UK), Olbers (Bremen, Germany), Browne (UK), commented that Aristarchus looked like a 6-7th magnitude lumninous star, some 3-4' in diameter. At 19:00UT Aristarchus looked like a cloudy spot according to Ward and Bailley (England, large telescope, x80). The Cameron 1978 catalog ID= 84-85 and the weight=5. The ALPO/BAA weight=3.
On 1961 Apr 19 at UT 20:00? an unknown observer reported in Aristarchus a light flash for 15 seconds. Cameron suspects a meteor? The Cameron 1978 catalog ID=735 and weight=1. The ALPO/BAA weight=2.
On 1981 Apr 08 at UT 21:45-22:00 P.W. Foley (Kent, UK, 12" reflector) found Aristarchus to be very bright, blue and variable. For example a CED brightness measurement at 21:45 was 0.5 and at 22:00 was 0.2. He also saw some white flashes on the eastern wall lasting each 2 sec in duration, Cameron 2006 catalog ID=128 and weight=1. ALPO/BAA weight=1.
On 1981 Jun 06 at UT 21:30 G.W. Amery (Reading, UK, 10" reflector, seeing III) observed that Aristarchus was "quite distinctly even in twilight & Moon's altitude. Remaining dark areas were just visible". The 2006 Cameron catalog ID=142 and weight=0. The ALPO/BAA weight=1.
On 1987 Feb 03 at 00:30UT J. de Carlo (Little Falls, NJ, USA, 4.5" refractor, x260, x350, seeing-very good) observed a very bright yellow light in the centre of Mare Crisium (near a raised crevice), almost like a "gigantic nuclear bomb explosion "which expanded (to 1/8th the diameter of mare Crisium) and then reduced in size. The flare fickered at a rate of 1/10s. apparently the edge of this TLP looked rough, almost like emittyed debris. The TLP was fixed in position on the Moon. TLP confirmed by observer's father. The Cameron 2006 catalog ID=295 and the weight=3. the ALPO/BAA weight=2.
On 2002 Feb 26th at 18:41:25 UT Michael Hather saw, on the limits of vision, a brief magnitude 7 white flash about 300 km north west of Aristarchus, in Earthshine. He was using a 120 mm refractor. No other observers were observing at this time.
On 1931 Feb 22 at UT 20:30 Joulia (Castelnaudary, Aude, France?) observed in the Aristarchus region: "Reddish-yellow glimmer of light, very variable with nearly complete extinction. (similar to Herschel's 1787 & Tempel's 6/10/1866 obs.)". The Cameron 1978 atalog ID=399 and weight=3.
On 1979 Jun 30 at UT0246-0319 D. & D. Darling (Sun Praire, WL, USA, 12.5" reflector, 80x and 150x, S=5/10). A weak blue glow seen in the Aristarchus region. It was fainter than that in May 1979 but was relatively easier to see. There was one "streamer" going south and another to the south west, and then smaller ones within the crater. These streamers started to fade from view at 03:04UT and the blow glow changed to a blow spot and Aristarchus became normal by 03:19 UT. Cameron 2006 catalog ID=56 and weight=1. ALPO/BAA weight=2.
Nebulous appearance. Cameron 1978 catalog assigns an ID No. of 12 and a weight of 1. ALPO/BAA catalog assigns a weight of 1.
On 1867 Apr 09 at UT 19:30-21:00 Elger(Liverpool? UK, 4"? aperture telescope) observed that Aristarchus was shining like a 7th magnitude star-like point, becoming fainter, almost extinguished at 9PM. He had seen lights before but never so strong. The Cameron 1978 catalog ID=151 and he weight=4. The ALPO/BAA weight=2.
Theophilus 1966 Jan 28 UTC 01:24-03:45 Observed by Cross & Ariola (Whittier, CA, USA, 19" reflector, x300, S=6-4, T=4, "3 red patches appearing and dissappearing at different times. Obscurred at sunrise on it. Later, red patch appeared on the floor." NASA catalog weight=5. NASA catalog ID #920. ALPO/BAA weight=3.
Ross D 1967 Dec 8 UT 02:30-02:40 Observer: Harris (Tucson?, AZ?), colourless bright area SW of Ross D with repeated condensations that appeared then dissipated in thirty seconds to a minute. ALPO/BAA weight=1.
Proclus 2003 February 8,2003 UTC 02:09-03:07 Observed by Gray (Winnemucca, NV, USA, 152mm F9 refractor Seeing 6-7, Transparency 6 305x) "Blinked Proclus with Wratten Red 25 and Blue 38A filters. Features seen through the red filter were basically seen with the same degree of clarity as in white light, in the case of sunlit walls, maybe a little bit better in the red. With the Blue 38A filter only the brightest part of the crater walls (north end) was visible-the rest of Proclus was dark shadow. At 3:07UT I compared the brightest parts of Proclus with Censorinus and Dionysius. The brightest parts of Proclus and Dionysius were comparable. Censorinus was much less bright than either of the above craters-the halo and crater were much faded over its usual brilliant appearance. Both Censorinus and Censorinus A were visible as distinct craters at 114x. The black shadow covering the east 40% of Proclus last night had broken up into three patches separated from each other by lighter bands. These were confined to the east crater wall. Only the central patch was black, the other two were considerably lighter. Running along the southwest edge of the crater floor of the crater floor appeared to be a hill to the north of which was a less elevated plateau. As the observing period progressed part of the brilliantly illuminated north crater wall developed a darker area which gradually became more prominent. As the sun is getting higher I would expect shadows and dark areas to diminish-what was happening here is unknown. However, this is not an unusual event for this part of Proclus". The ALPO/BAA weight=2.
Censorinus 1959 Sep 08 UT 22:45-23:50 Observed by Jean Nicolini (Brazil) "Much brighter than Proclus" NASA catalog weight=2. NASA catalog ID #721. ALPO/BAA weight=2.
Theophilus 1964 May 18 UTC 01:05-01:15 Observed by Dieke (Baltimore, MD, USA, 6" refractor, x125) "Crescent of crsimson color on SW between rim & flor. Was not present at 0500, nor did it reappear from 0115 to 0245h" NASA catalog weight=3 (average). NASA catalog ID #812.
Near Ross D (23E, 12N) 1964 May 18 UT 03:54-04:53 Observed by Harris, Cross et al. (Whittler, CA, USA, 19" relector x720, 8" reflector x322, S=G) "White gas obscuration. Moved 20mph, decreased in extent. Phenom. repeated. Drawing." NASA catalog weight=5 (very high). NASA catalog ID 811.
Limb North? 1881 Jul 04 UT 00:30 Observed by Several observers (Lebanon, CT, USA, naked eye, alt @ 10 deg) "2 pyramidal protruberances on upper limb (dark?). Points were darker than rest of moon's face then slowly faded away (atm ? moon very low)" NASA catalog weight=? NASA catalog ID #223.
Alphonsus 1965 Apr 08 UTC 20:00? Observed by Hoffman (Germany?) "Saw variable shining bright lights". NASA catalog weight=1 (very low). NASA catalog ID #873.
Aristarchus 1965 Apr 08 UTC 20:00? Observed by Hoffman (Germany?) "Saw variable shining bright lights". NASA catalog weight=1 (very low). NASA catalog ID #873.
Censorinus 1965 Apr 08 UTC 20:00? Observed by Hopmann (Czecholovakia?) "Green flash or brightening (date correct ? written 8-4-65. First taken as American convention, thus as Aug. 4, but now think it was in European convention of day first then month)." NASA catalog weight=2 (low). NASA catalog ID #873a.
Hyginius N 1965 Apr 08 UTC 20:00? Observed by Hoffman (Germany?) "Saw variable shining bright lights". NASA catalog weight=1 (very low). NASA catalog ID #873.
Linne 1965 Apr 08 UTC 20:00? Observed by Hoffman (Germany?) "Saw variable shining bright lights". NASA catalog weight=1 (very low). NASA catalog ID #873.
Proclus 1965 Apr 08 UTC 20:00? Observed by Hoffman (Germany?) "Saw variable shining bright lights". NASA catalog weight=1 (very low). NASA catalog ID #873.
On 1987 Nov 28 at UT 04:16-04:45 D. Louderback (South Bend, WI, USA, 3"reflector, x150, S=E) observed that the Promontorium Agarum plateau was rather dull and grayish - usually it was "tannish" "even > sunlit areas, & twin craters at his point A which are always > spots on plateau. At 0420 whole plateau sank into complete darkness, hard to distinguish from mare plain. albedo dropped to 5 from 6.8 reading. Nearby plain was normal 5 so phenomena had not spread to it. At 0424 Cape started to reappear to albedo 6 until 0445, when it returned to normal, but not sharply defined - like through haze. Detail better in red than in blue filter, sketches. The Cameron 2006 catalog ID=315 and the weight=4. The ALPO/BAA weight=3.
In 1878 Oct 03 at UT 20:00 an Unknown observer noted that Hyginus Nova had the most conspicuous of all appearances, and there was no trace of it on 1878 Oct 04. The Cameron 1978 catalog ID=201 and weight=3. The ALPO/BAA weight=2.
Mare Crisium 1989 Jan 14 UTC 19:15 Observed by Hedley-Robinson (Devon, UK, 5" Coude, Antoniadi II seeing, x150) "Floor blinks indicating colour - used a Moon blink device". 2 areas of the floor were affected, The first one was on the far west of Mare Crisium, next to Proclus crater. The second area was in the NNW, but outside the edge of the mare. Other features elsewhere checked but gave no colour reaction. Peters (UK) though did detect colour elsewhere, but his seeing was III- IV. The Cameron 2006 catalog ID=344 and the weight=5. The ALPO/BAA weight=3.
On 1989 Jan 14 at UT 19:15-19:30 M. Holmes (Rochdale, England, UK) reported that Torricelli B was "dull & inconspicuous". The Cameron 2006 catalog ID=344 and the weight=5. The ALPO/BAA weight=1.
Plato 1964 May 20 UT 01:00-01:30 Observed by Bartlett (Baltimore, MD, USA, 2.4" refractor x117, S=6, T=5). "Orange-red color on W. wall. Vivid" NASA catalof weight=4 (high). NASA catalog ID #813.
Proclus 1972 Aug 17 UT 20:05-21:10 Observed by Haiduk (13.25E, 52.5N, 60mm refractor, S=1, T=3) "Well visible bright area at the NE wall, end of event uncertain for seeing became poor" Hilbrecht & Kuveler Moon & Planets (1984) Vol 30, pp53-61.
On 1867 Apr 12 at UT 19:30-21:00 Elger (Liverpool? UK, 4" aperture telescope) observed Aristarchus in Earthshine "grew fainter 7th mag. star; much fainter in last 15 min. & barely perceptible at 9PM. Had seen something similar on former occ." The Cameron 1978 catalog ID=152 and the weight=4. The ALPO/BAA weight=2.
In 1878 Oct 04 at UT 20:00 an Unknown observer noted that Hyginus Nova could not be seen, whereas the night before the crater had the most conspicuous of all appearances. The Cameron 1978 catalog ID=201 and weight=3. The ALPO/BAA weight=2.
Williams of the UK, on 1892 Sep 20 at Moon's age 8.4 days, noticed a spot that had been seen on the 21st and 23rd of the same year with abnormal brightness. The spot was near Picard. Williams comments the spot was "nearly as large but a little fainter than Picard, This observation was reported in the Astronomical Register of the Royal Astronomical Society and is not included in the Cameron catalogs. It is one of many measurements of the brightness of this spot for different illumination angles and is one of three outlying brightness points spotted on a graph by Willaims. The ALPO/BAA weight=3.
Eratosthenes 1976 Jun 06 UT 02:01 Observed by Bartlett (Baltimore, MD, USA, 3" reflector x54-300, S=5, T=5) "Bowel was full of shadow but a small 5 deg bright spot on NE floor. Nothing seen in 1975 at nearly same col. but shadow was deeper." NASA catalog weight=4 (high). NASA catalog ID #1432.
On 1960 Aug? 01 at UT 22:00? an unknown observer detected that Vitello was illuminated -it should have been in shadow? Cameron says that if several days before sunrise then the date could have been July through to December, with August 1st most likely, and ancilary data is therefore given for this date. The Cameron 1978 catalog ID=729 and weight=1. The ALPO/BAA weight=1.
2007 Oct 20 UT 17:31 A.Pink (Basinkstoke, UK) images a flash on the dark size of the Moon near to Vitello. The ALPO/BAA weight=1.
On 1989 Jan 16 at UT 20:00 G. North (Herstmonceux, UK, 30" reflector) observed Toricelli B to change in brightness and found colour in it. A 10 minute exposure spectrum was taken (Cameron does not have information on whether anything unusual was recoeded) before clouds obscured the Moon. Normally a 30 minute exposure would be needed. The Cameron 2006 catalog ID=345 and the weight=3. The ALPO/BAA weight=3.
Plato 1979 Apr 06 UT 18:00-21:00 Observed by Crick (Belgium, seeing II- III) Part of floor darker than normal and obscuration on inner west wall - the effect did not change during the observation. Drawing made. Cameron 2006 catalog ID=49 and weight=3. ALPO-BAA weight=2.
Plato 1878 Oct 05 UT 21:40 Observed by Klein (Cologne, Germany, 6?" refractor) "Fog in W. part of crater. Faint shimmer like thin white cloud" NASA catalog weight=4 (high). NASA catalog ID #203.
On 1982 Mar 04 at UT 20:00 M.C. Cook (Frimley, UK) found Censorinus (4.6) to be brighter than Proclus (4.0) in white light. The Cameron 2006 catalog ID=164 and weight=4. The ALPO/BAA weight=1.
On 1982 Mar 04 at UT 20:00 M.C. Cook (Frimley, UK) found Proclus (4.0) to be fainter than Censorinus (4.6) in white light. The Cameron 2006 catalog ID=164 and weight=4. The ALPO/BAA weight=2.
Plato 1870 May 10 UTC 22:00 Observed by Birt (England) "Extraordinary display of lights. Says not effect of sunlight" NASA catalog weight=4 (high). NASA catalog ID #167.
P. Moore at 21:10 found the southern wall (and ontothe southern floor) of the crater to be indistinct. Elsewhere in the crater everything was sharp. The effect was still seen at 21:42UT, but less strong. A check was made for colour with aq Moonblink device, but none was seen. There was still a trace of this effect at 21:44UT, although detail was now becoming visible. By 21:48UT vertical streaks were seen crossing the floor from the obscuration area and these were more visible in the red filter and not in the blue. Cameron comments that undefined patches on the floor of Plato are not normal. By 21:55UT some craterlets on the floor started to become visible and the TLP for Moore ended by UT22:23. P.Foley was alerted by Moore and saw a "amssive dense obsecuration on the south wall, south floor and south outer glacis to the Mare". Foley noted that by 21:50UT the effect was fading and finished by 22:03UT. Foley reported an orange translucent haze covering half of the floor, but floor craterlets could be seen on and off - however his atmospheric seeing conditions were IV. At 22:00 UT Foley reported the floor close to the north wall to be "milky or misty". No detail was visible at 21:15UT and variability in the floor continued until 23:10UT. Hedly-Robinson was aleted at 21:35UT and found no difference between red and blue views of the area, however he did find that the south rim was indistinct although this effect had lessened by 22:00 UT and was normal by 22:17UT. M. Mobberly saw a white spot on the floor at 21:20 UT, whereas he normally would have expected to see craterlets. Mobberly was alerted at 21:40 UT and took some colour photos. He also made sketches that showed variability in the floor and dark lines and patches in the north west corner. However the altitude of the Moon was low. Cameron mentions that two of the photos show loss of detail at the south wall and beyond.and also a change in the floor markings.The north wall at 21:50UT was strangely reddish (didn't think this was spurious colour). The rest of the wall was sharp at 22:20UT through a yellow filter. Large bright patch in the centre and rest of the floor was apparently of the same shading as Mare Imbrium. The above notes are based upon the Cameron 2006 catalog extension TLP ID 145 and weight=4. ALPO/BAA weight=3.
On 1964 Jan 24 at 20:00? Scarfe (UK) obtained spactra showing luminescence? The Cameron 1978 catalog ID=796 and weight=5. The ALPO/BAA weight=3.
C. Brook of Plymouth UK, using a 4" refractor x216, noticed at UT 20:10 dark patches coming and going (in terms of visibility) on the floor of Plato. Occasional views of the central cratelet (seen as a white spot) were glimpsed. The dark patches seen lasted about 1-2 seconds before fading out during each visibility cycle. Teneriff Mountains were checked but no sign of seeing effects that might explain the dark floor patches. By 20:26UT the dark patch effect was fading and by 20:31UT floor detail was visible. Observations ceased at UT 20:34. Seeing conditions were II and the Moon was at a high altitude. Other observers were alerted but came on-line after the effect had finished. ALPO/BAA weight=2.
Gassendi 1976 Oct 04 UT 20:55-20:58 Observed by Robinson (Devon, England) - observer noted that the east outside wall was bright in red and normal in blue. Note that the Moon was 30 deg above the horizon at the time of the observation. The crater returned to normal at 20:58. Also seen by Moore (Selsey, UK) and Foley (Kent, UK). At 21:25-21:50 D. Sims (Dawlish, UK, 25cm reflector, x300, seeing IV and some cloud at times) noticed a possible obscuration over the southern part of Gassendi. He had been observing earlier at 18:40-19:30 but had not detected a TLP in Gassendi then. 22:11UT Robinson notices that the spot outside the east wall is again bright in red., though by 22:25 it had faded and was gone by 22:28UT. The Cameron 1978 catalog further quotes: "Vivid red spots & general red color seen around rim by 2 obs. At 2209h blood red small area was seen. 1 h later the most westerly (IAU?) of the peaks had become hazy white all other areas were sharp. (Indep. confirm.)." Cameron 1978 catalog weight=5 and catalog ID #1454. The ALPO/BAA weight=3.
On 1977 Apr 29 at UT21:40-23:20 an unknown UK observer reported a TLP in Gassendi crater. The following are reports by observers attempting to confirm activity: J.W. Napper (Didcot, UK, 30cm reflector, x287, Wratten 25 and 44a, conditions clear 5+) received a telephone alert call at 22:00 but the sky was cloudy until 22:30. An initial look revealed nothing unusual, then at 22:54 he observed a colour blink just inside the north wall, appearing bright in red and normal in blue or white light. No loss of detail seen and the effect lasted only 2 minutes. A sketch was made. However the observer stresses that the very bad seeing casts some doubt on this observation. L. Fitton observed using a 8.5" reflector, with Moon blink device at x200, seeing was I- II. All areas negative, including Gassindi from 21:40-21:55 and again 22;00-22:25 and finally 22:50-23:30 negative. Mike Brown (Huntington, York, UK, 30cm reflector, x220 and x350, seeing 3-4/5, and transparency 5/5) - observed from 22:00-23:25UT no colour seen, nor obsecuration, all filters negative, despite seeing a lot of fine setail inside this crater.
On 1980 Jul 23 at UT22:00 G.W. Amery (Reading, UK, 8" reflector, x144 and x207, seeing=III-V and transparency=fair) found that the interior shadow was a light grey. BAA TLP coordinator (Foley) suggests that this was light reflecting from the illuminated walls? Cameron 2006 catalog TLP ID=102 and weight=1. ALPO/BAA weight=2.
Aristarchus visible just past terminator. West wall was brighter than normal. Bright flash seen in/on NW wall - apparently in the same place as Pedler's May 17th sketch. Cameron 2006 extension catalog ID=146 and weight=4. Observed by M. Price of Camberley, Surrey, UK with a 6" reflector and a Moon Blink device. Seeing=III.
Plato 1981 Jun 13 UT 20:48-21:08 Observed by Price (Camberley, England, 152mm reflector, seeing III) Possible Moon blink (red) seen on north wall. Also the craterlets on the floor could be seen despite the observing conditions not being optimal. BAA Lunar Section observation. Cameron 2006 extension catalog ID=146 and weight=4. ALPO/BAA weight=3.
On 1984 Jan 14 at UT 20:00 P. Moore (Selsey, UK) observed that Aristarchus was brighter than it normally is at sunrise. No quantitative measurements were made though. The Cameron 2006 catalog ID=238 and weight=3. The ALPO/BAA weight=1.
On 1990 Jan 08 at UT00:55 D. Weier (Sun Praire, WI, USA, 12.5" reflector, x159) observed an "anomalous black bar across Aris. Nearly digonal to terminator." The nearby crater Prinz had curious shadow patterns, perhaps related to the rising sun projecting shadows from the eastern rim and "reflected down"? "At 0224 W wall had a break in it & a diffuse glow where it should not be. Manske thinks it was Earthshine effect. At 0305 Weier saw Manske's bar - with diffused light and flicker like an aurora - like a gas with electric charge. At 0325 saw a strange glow in Aris. but may be due to atm. though thought it to be a LTP. Darling had never seen such effects before (flickering implies a medium in it)." The Cameron 2006 catalog ID=387 and the weight=3. The ALPO/BAA weight=3.
Observer noted a bright spot on the interior west wall that seemed brighter than what they would have expected. unfortunately the precise time of this observation was not recorded so the moon-rise and midnight UT values are used to place a limit on the time of observation. Images by Shaw taken at UT 1754, 18:45 and 23:13 do not exhibit the effect.
Plato 1870 May 11 UTC 22:00 Observed by Birt (England) "Extraordinary display of lights. Says not effect of sunlight" NASA catalog weight=4 (high). NASA catalog ID #167.
Gassendi 1966 May 01 UT 19:30-00:21 Observed by Sartory (UK, 8.5" reflector, x500, S=G), Moore, Moseley (Northern Ireland, 12.5" reflector x350, S=E) and by Corralitos Observatory (Organ Pass, NM, USA, 24" reflector + moon blink) "Eng. moonblink & obscuration, also vis. confirm (Moore & Moseley alerted by Sartory. Corralitos MB did not confirm. - but they may not have been observing at the ame time?)." NASA catalog weight=5. NASA catalog ID #932. ALPO/BAA weight=4.
On 1978 May 18 at UT20:45-21:53 J.D. Cook (Frimley, UK, 12" reflector, x240) observed Promitorium Laplace to have visually a brown colour - though no Moon Blink (red and blue filters) effect was detected. Cameron comments that this is probably a subjective effect - also others have reported something similar at times. The Cameron 2006 catalog ID=30 and weight=3. The ALPO/BAA weight=1.
M. Cook of Frimley, UK observed a brightening of the crater during this observing session. The cameron 2006 extended catalog ID=346 and weight=3. ALPO/BAA weight=2.
Foley, Kent, UK noted that the floor was slate blue-grey with no colour seen elsewhere. 12" reflector used, seeing=II. Cameron 2006 extension catalog ID 131 and weight=1. ALPO/BAA weight=1.
Gassendi 1976 Oct 04 UT 21:30 P. Moore (Selsey, UK, x400, seeing poor) observed redness in the c.p. area. The ALPO/BAA weight=1.
On 1964 May 26 UT 04:10-04:35 Bartlett (Baltimore, MD, USA, S=5, T=5). observed that Aristarchus had a strong blue-violet glow on the east wall and EWBS, with a strong violet tinge on the nimbus. Crater was hazy, could not focus it in red, green or blue light. The Cameron 1978 catalog ID= and weight=4. The ALPO/BAA weight=2.
On 2000 Jun 15 UT 20:37 C. Brook (Plymouth, UK, 60mm refractor, x117 & x40, seeing good, transparency excellent) observed abright spot on the north rim of Mare Crisium (57E, 25N). It was comparable to the illuminated rim of Proclus in brightness. No colour seen. The spot was not visible the next night. The ALPO/BAA weight=1.