Jupiter & Ganymede

[josefk]

Bit of a scruffy one this and an unlooked for observation overall while having an otherwise "kit shakedown" type session.

When i swung to Jupiter last night it was immediately apparent it had a "pimple" on its north eastern limb. I suspected a moon going into or coming out of occultation so settled in to watch. Checking SkySafari it was indeed Ganymede coming out of occultation. I wear a mechanical watch so my timings are probably not super precise (and i didn't think to use my iPad till too late) but i recorded clear separation at ~23:35...23:37 BST and probably nearer to 23:35. 

NEB/SEB were prominent and flickering thick and thin. The NTB/STB intermittently flickered into view (the NTB most sharply). The southern pole had a hint of darkening but the view was bright overall so it was very subtle. The seeing was not as good as the apparent score would suggest. Seeing on a micro level was fine but there where "bigger lumps" of boiling air passing through the FOV.

This is with an 85mm apo and orthoscopic eyepiece for x113.

 

[RobertI]

Nice report and sketch. Not bad for “scruffy”! 🙂

[josefk]

@RobertI - i'm having glasses trouble - my writing/plotting IS scruffy but not THAT scruffy if i can see the end of the pen where it meets the paper properly 🙂

Edited September 4, 2023 by josefk

[Richard N]

7 hours ago, josefk said:

Bit of a scruffy one this and an unlooked for observation overall while having an otherwise "kit shakedown" type session.

When i swung to Jupiter last night it was immediately apparent it had a "pimple" on its north eastern limb. I suspected a moon going into or coming out of occultation so settled in to watch. Checking SkySafari it was indeed Ganymede coming out of occultation. I wear a mechanical watch so my timings are probably not super precise (and i didn't think to use my iPad till too late) but i recorded clear separation at ~23:35...23:37 BST and probably nearer to 23:35. 

NEB/SEB were prominent and flickering thick and thin. The NTB/STB intermittently flickered into view (the NTB most sharply). The southern pole had a hint of darkening but the view was bright overall so it was very subtle. The seeing was not as good as the apparent score would suggest. Seeing on a micro level was fine but there where "bigger lumps" of boiling air passing through the FOV.

This is with an 85mm apo and orthoscopic eyepiece for x113.

 

Nothing scruffy really. Any contemporaneous sketching is an achievement. 

[callisto]

Excellent 👍 

Reminds me of the SPA planetary section reports...ahh, the good ole days 🙂