Vol 49, No 4, April 2012 - BAA Lunar Section

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Figure 3. Extracts from Rolf Hempel’s image mosaic from 2012 Feb 06 with north at the top. From left to right: Aristarchus, Menelaus, Censorinus and Proclus. 5) Aristarchus: When Sir Patrick Moore observed Aristarchus on 1983 Oct 20, at 23:40 he reported that Aristrachus was brighter than normal (using a CED), and more so than Censorinus, Menelaus, and Proclus in turn. On 2012 Feb 06 Rolf Hempel took a whole Moon image mosaic between 21:16 and 22:02 UT under very similar illumination. In order of brightness here are the corresponding maximum digital number values: Aristarchus (253), Censorinus (255), Menelaus (253) and Proclus (255). However this does not tell the whole story as not all parts of each crater is at peak brightness. Figure 3 shows that Proclus and Censorinus appear ‘visually’ to be the brightest, or rather have more bright pixels per unit area. So for now I will leave the weight of this observation at a 2 as it is possible that viewing angle (libration) may have some effect too. TLP Reports: One TLP report was received: on Feb 28 at UT 19:45-20:00 Raffaello Braga (Italy, 100 mm refractor, seeing III, transparency very good)) when he examined Maurolycus and found that the central peak of the crater was bright in red light but disappeared in blue light. Interestingly this matched what Staedke of Berlin saw back in 1971 May 01 under similar illumination. Suggested Features to observe in April: For those of you without access to the internet (in the UK), below is a list of repeat conditions for when a feature will exhibit the same illumination and libration as was seen for a historical TLP observation from the past. By re-observing and submitting your observations, we will get a clear understanding of what the feature ought to have looked like at the time. Only this way can we really fully analyze past TLP reports. 2012-Apr-01 UT 18:37-20:02 Ill=70% Proclus observed by Darling on 1988-07-24: Please image or sketch. 2012-Apr-02 UT 00:17-02:39 Ill=72% Promontorium Laplace observed by Cameron on 1994-04-21: Can you see or image any colour here 2012-Apr-02 UT 18:39-21:20 Ill=79% Proclus observed by Davis on 1988-07-25: Please sketch or image the interior of the crater. 2012-Apr-02/03 UT 23:34-03:04 Ill=81% Posidonius observed by Dzaplashvilli on 1952-07-03: Try observing the crater through a polaroid filter (or glasses) and rotate the filter – anything happen 2012-Apr-03 UT 18:41-19:03 Ill=88% Herodotus observed by Bartlett 1971-07-05: Any sign of pseudo peak on the floor 2012-Apr-04 UT 19:20-22:14 Ill=94% Aristarchus observed by Bartlett on 1964-10-19: Any colour visible on the east part of the floor 2012-Apr-04/05 UT 22:19-02:12 Ill=95% Herodotus observed by Manske on 1989-06-17: Is there a nebulous spot near to Herodotus Is it brighter or darker in red or blue filters 2012-Apr-04/05 UT 23:01-02:51 Ill=95% Aristarchus and Copernicus observed by Scarf on 1963-10-30: Are either of these craters brighter at 540 nm or in an orange filter than in yellow or red light 2012-Apr-05 UT 00:51-03:49 Ill=95% Schroter’s Valley observed by Louderback on 1981-11-10: Is there any colour visible at the Cobra’s Head 2012-Apr-05/06 UT 23:32-03:28 Ill=99% Aristarchus observed by Moore on 1983-10-20: How bright is Aristarchus compared to Censorinus, Menelaus and Proclus Which is brighter than which 20 BAA Lunar Section Circular Vol. 49 No. 4 April 2012
2012-Apr-06 UT 00:21-04:04 Ill=99% Aristarchus observed by Bartlett on 1965-09-10 and Manchester University: Please look for detail and colour on the floor and is the crater brighter in red, specifically at 545 nm and 673 nm 2012-Apr-06 UT 00:21-04:11 Ill=99% Aristarchus observed by Bartlett on 1965-09-10, LeCroy on 1976- 02-14 and Manchester University on 1963-11-01: Please look for detail and colour on the floor, elsewhere, and is the crater brighter in red, specifically at 545 nm and 673 nm 2012-Apr-06 UT 01:19-04:11 Ill=99% Copernicus observed by Manchester University astronomers on 1963-11-01: Is the crater brighter in red, specifically at 545 nm and 673 nm 2012-Apr-07 UT 01:05-04:35 Ill=100% Plato observed by Moore on 1980-09-24: Can you see anything resembling an obscuration on the NW wall or floor Any colour seen 2012-Apr-07 UT 01:26-04:35 Ill=100% Fracastorius observed by Robinson on 1980-09-24: Any colour visible on the northern side Try using red and blue filters. 2012-Apr-07 UT 02:47-04:35 Ill=100% Aristarchus observed by Moore on 1980-09-24: Can you see any colour on/in the crater 2012-Apr-12 UT 04:26-05:21 Ill=64% Rimae Triesnecker observed by Markhov on 1915-07-03: Please image or sketch. 2012-Apr-14 UT 04:07-05:17 Ill=42% Schroter’s Valley observed by Pickering on 1891-09-25: Please sketch or image. 2012-Apr-17 UT 04:02-04:50 Ill=15% Mare Crisium observed by Arsyukhin on 1982-11-11: Please image or sketch in Earthshine. 2012-Apr-23 UT PM Ill=6% Aristarchus observed by Celis on 1970-08-04: How bright is Aristarchus and can you see any colour in the crater in Earthshine 2012-Apr-24 UT 21:23-22:05 Ill=11% Aristarchus observed by Celis on 1970-08-05: How bright is Aristarchus in Earthshine 2012-Apr-25 UT 21:25-22:52 Ill=17% Aristarchus observed by Celis on 1970-08-06: How bright is Aristarchus and can you see any colour in the crater in Earthshine 2012-Apr-25 UT 20:03-21:07 Ill=17% Please check Earthshine for sporadic meteor impact flashes. 2012-Apr-26 UT 20:05-21:50 Ill=26% Please check Earthshine for sporadic meteor impact flashes. 2012-Apr-27 UT 20:07-22:28 Ill=35% Please check Earthshine for sporadic meteor impact flashes. 2012-Apr-28 UT 20:09-23:00 Ill=45% Please check Earthshine for sporadic meteor impact flashes. 2012-Apr-28/29 UT 20:11-00:06 Ill=44% Picard observed by Hua on 1994-04-28: Is the rim of this crater dark 2012-Apr-30 UT 19:27-20:25 Ill=65% Mons La Hire observed by Klein on 1887-02-02: Any colour or shadow present 2012-Apr-30 UT 19:27-20:08 Ill=65% Plato observed by Bartlett on 1964-11-14: Any colour on the rim For repeat illumination (only) TLP predictions for the coming month, these can be found on the following web site: http://users.aber.ac.uk/atc/tlp/tlp.htm .For members who do not have access to the internet, please drop me a line and I will post predictions to you. If you would like to join the TLP telephone alert team, please let me know your phone No. and how late you wish to be contacted. If in the unlikely event you see a TLP, please give me a call on my cell phone: +44 (0)798 505 5681 and I will alert other observers. Note when telephoning from outside the UK you must not use the (0). When phoning from within the UK please do not use the +44! Twitter TLP alerts can be accessed on http://twitter.com/lunarnaut. Dr Anthony Cook, Institute of Mathematical and Physical Sciences, University of Wales Aberystwyth, Penglais, Aberystwyth, Ceredigion, SY23 3BZ, Wales, United Kingdom. Email: atc @ aber.ac.uk. BAA Lunar Section Circular Vol. 49 No. 4 April 2012 21
Page 1 and 2: Director: Bill Leatherbarrow The Br
Page 3 and 4: Topographical notes compiled by Pet
Page 5 and 6: Sunrise on Plato Nigel Longshaw In
Page 7 and 8: Encke, 2012 March 03 Peter Grego No
Page 9 and 10: Join us at our Yahoo! Group: Lunar
Page 11 and 12: Images Since March’s LSC, lunar i
Page 13 and 14: (detail below) BAA Lunar Section Ci
Page 15 and 16: Peter Oden took this detailed image
Page 17 and 18: BAA Lunar Section Circular Vol. 49
Page 19: Figure 1. A modified sketch of Aris
Page 23 and 24: Graze occultations ZC 1198 on 2012
Page 25: Lunar data for April 2012, lunation

Vol 49, No 4, April 2012 - BAA Lunar Section

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