L13: Gassendi (second try)

On 10 February 2014 I made a sketch of lunar crater Gassendi. At the time I was just starting out in lunar observing and this was my first sketch of a major lunar crater. It goes without saying that I found the task quite challenging. Yesterday, and almost two years down the road, I had the opportunity to make a new sketch of Gassendi.

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Both observations made using a SkyWatcher 10″ and av TeleVue Nagler 3-6 zoom eyepiece. The sketch to the left was made on 23 October 2015, UT 18:00 (col. 51.1º and lun. 10.83), the one to the right on 10 February 2014, UT 21:00 (col. 44.3º and lun. 10.02). South is up.

At both occasions Gassendi was sketched under similar (but not identical) lighting conditions and with good seeing (4/5). This means that the differences between the two sketches are due not to atmospheric conditions or the sun angle, but rather to my experience as a lunar observer.

After many years of deep sky observing I know from experience that the hours spent at the telescope slowly increases your ability to see faint details and to observe low contrast object. But when I started out doing lunar observations I would never have guessed, that the hours spent gazing at comparably bright and contrasty lunar features, would have a similar effect. Obviously they did. My sketching techniques has improved somewhat (still a long way to go), the precision in the depiction is better, but most notably I am happy to see that my attention to detail have increased.

I will try to return to Gassendi in the years to come. Hopefully the next sketch will show some further improvements.

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L13: Gassendi & Mare Humorum

A rather quick sketch of Mare Humorum and a number of prominent craters, including Mersenius and Gassendi. The seeing for once was perfect, but after having finished several other sketches the same evening my endurance failed me.

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Sketch made on 4 October 2014 using a SkyWatcher 10″ and a TeleVue Nagler zoom 3-6 mm.

Below is an earlier sketch focusing on the Gassendi crater. This was my first try at a close up sketch of one of the larger craters. At the time seeing was perfect, but light clouds kept interfering.

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Sketch made on 10 February 2014 using a SkyWatcher 10″ and Baader Genuine Orthos 5 & 9 mm. North towards the bottom.