Friday, 25 January 2013

Craters Pythagoras, Oenopides + Markov



The three named craters in this sketch show along the terminator.
The largest crater at the top is Pythagoras, 130km in diameter with steep 5000m cliffs and a double central mountain (although only one showed at the time of the sketch).
Oenopides is next with steep terraced cliffs, 68km at its widest point and suffers the same crushed walls as Pythagoras from the walled plain Babbage in the centre.
Right at the bottom of the sketch is Markov the smallest crater at 41km in diameter and with 2400m cliffs.

Telescope / 4" f/11 Lyra
EP / 3/6mm Nagler zoom at 6mm x183
Temp / 2˚C
Transparency / average
Antoniadi III
Colongitude 65.6˚
Phase 26.6˚
Lunation 12.99 days

Monday, 21 January 2013

Crater Parry + Guericke



Crater Parry at the top of the sketch has a diameter of 47km and although its heavily damaged and lava flooded, steep cliffs still surround it and cast an ink black shadow which really stood out and was the reason for sketching this area.
Below Parry is the walled plain Guericke at 63km its larger but heavily eroded and partly open to Mare Nubium.

Telescope / 4" f/11 Lyra
EP / 3-6mm Nagler zoom at 5mm x220
Temp / -1˚C
Transparency / clear
Antoniadi II
Colongitude 17.5˚
Phase 69.4˚
Lunation 9.04 days

Sketched with Conte pastels and charcoal on a 12"x8" sketch pad.

Wednesday, 16 January 2013

M52



M52 / NGC7654 / The Scorpion
Constellation - Cassiopeia
Open cluster
Distance - 5100Ly
Mag 6.9

Date - 14/1/13
Seeing - Antoniadi III
Transparency - poor
SQM 19.88 (LM 5.4)

Telescope - 16" f/4.5
EP - 26mm Nagler x73 (TFoV 1.1˚)

Sketch notes
Faint cluster, but stands out quite well and a fairly easy find.
Poor transparency (and rain!) made it a tricky sketch.

M76



M76 / NGC650-651 - The Little Dumbbell Nebula
Constellation - Perseus
Planetary nebula
Distance - 3900Ly
Mag 10.1

Date - 14/1/13
Seeing - Antoniadi III
Transparency - poor
SQM 19.95 (LM 5.4)

Telescope - 16" f/4.5
EP - 10mm Pentax XW x189 (TFoV 0.2˚)
Filter - Lumicon OIII

Sketch notes
Fairly easy to find even without a filter but both UHC and OIII filters really helped bring out the structure and showed the almost rectangular shape of the central nebula.
Poor seeing and transparency last night so I kept the magnification fairly low to make the sketch but I think it will be worth trying higher mags in a steady sky.