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«Sketch and text by Robert H. Hays, Jr. - Worth, Illinois, USA December 31, 2014 02:08-02:34 UT, 15 cm refl, 170x, seeing 8/10 I sketched this crater ...»

-- [ Page 3 ] --

Figure 8. Gassendi, orientated with south towards the top.

(Left) Sketch by myself, made in 1977 Sep 23 UT 21:05. (Right) Image taken by Maurice Collins on 2015 Mar 31 UT 09:23.

Maurice’s image appears very similar to my rough sketch, but does not show the colors I saw in 1977, but observing conditions were pretty poor then and my observation had a weight of 1. It does not show any of the Sartory reported colors either. It would seem appropriate to leave the weights as they are, but it may be worth trying again with repeat illumination imagery, and especially visual observations with similar instruments.

21 Pico B: On 2015 Mar 31 UT 23:30-23:53 Kevin Berwick (ALPO, using a TV101 4 inch APO, Nagler zoom at 3

mm, 180X) observed the Mons area under similar illumination to the following LTP report from 1934:

In 1934 Feb 25 at UT 18:30 Rawstron (USA?, 4" refractor, x250, S=6/12) observed in Pico B: "A large patch of haze appeared & drifted off across the mare in same direction as haze from Pico (white patch). It was obs. on 20 other occasions. Drawing". The Cameron 1978 catalog ID=410 and weight=3. The ALPO/BAA weight=2.

Kevin commented that he looked at this region throughout the observing period and saw nothing unusual and certainly no haze effect. Alas the summary of the Rawstron observation, from the Cameron Catalog, does not give any information about the speed of the drifting haze, nor exactly what the observer meant by “It was obs. On 20 other occasions”? – on the same day?? – over what UT range??? The reference for the original 1934 observation comes from Popular Astronomy (1934) Vol 34, p 291 – which unfortunately I do not have a copy of – does anybody have this? Therefore I will leave this LTP at a weight of 2 for now.

Suggested Features to observe in May: For repeat illumination (and a few repeat libration)

LTP predictions for the coming month, these can be found on the following web site:

http://users.aber.ac.uk/atc/tlp/tlp.htm. 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 LTP reports.

If you would like to join the LTP 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 LTP, firstly read the LTP checklist on http://users.aber.ac.uk/atc/alpo/ltp.htm, and if this does not explain what you are seeing, 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 LTP 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.

–  –  –

FOCUS ON targets X = Rimae Sirsalis Y = Mare Tranquillitatis

23

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