Observing from Home – 11 August 2019


  • 11 August 2019 – 22:00 (8/11) – 00:30 (8/12) EDT
  • mild – 60º-65º F; humidity 80-85%
  • Moon +11 days ~90% illumination
  • still; clear at first, but increasing clouds toward midnight
  • seeing – 6 or 7/10 – pretty good
  • transparency – inconsequential, as I was hunting orbs


  • Celestron NexStar Evolution 8″ SCT
  • Eyepieces
    • 32 mm
    • 15 mm
    • 9 mm
    • 6 mm
  • 2x Barlow
  • Filters
    • Moon, blue, green, yellow


  • Moon
  • Jupiter
  • Saturn


A pleasant Sunday night. I pondered long about going out, because, much as I love the NexStar 8, it is a pain to drag it down to the pool deck. I finally discerned that my 3 targets – Jupiter, Moon, and Saturn – would be visible from the deck, so I set up in the northwest corner there. The problems were shakiness (really need to reinforce the deck at some point) and the TV aerial, which turned out to be right in the path of the moon and Saturn. The moon was just a few degrees W of Saturn, both sitting just above the Teapot of Sagittarius. Jupiter was 15º or so to the west just above Antares in Scorpius/Ophiuchus.


Southern region of the Moon. North is up. Just inside the terminator on the right (West) from bottom to top you can see Schiller, Gassendi, and Kepler, mentioned in the writeup.

I started with the Moon, using 32 mm = 62.5 X with moon filter and variations with 15 mm, 9 mm, and 2x Barlow. I don’t know the moon that well, so didn’t do much more than identify several craters. In the SW quadrant; Schiller, , a long, squashed crater; Gassendi was just east of the terminator – large with prominent central peak; small Flamsteed; up to Encke and Kepler, just on the terminator. On into the NW, Prinz on the terminator, and I think it was breaking dawn on Aristarchus, which sounds like a new age album. Saw Bianchini and Sharp just outside Sinus Iridum. After that I made my way to Mare Tranquillitatis to see if I could find the Apollo 11 astronaut craters: three small craters in a row just north of the landing site and named Aldrin, Collins, and Armstrong. Turns out they are quite small. While theoretically in reach of my scope, I had two problems (at least): 1) I had neglected to add my dew shield and was starting to fog over, and 2) the aforementioned TV aerial was now sitting across the heart of the moon, so that I wasn’t getting good resolution, even at 222 X. [An article in July 2019 Sky&Telescope suggests a 6″ scope can make them out at 250 X with steady seeing.]


Moved on to Jupiter, sitting low in the SW. Tried pushing the magnification to 333 X, and it was just a bit too much. 222 X wasn’t quite enough, but I didn’t think to use the 15 mm + 2X for 266 X, which might have been Goldilocks. Oh well. The GRS (Great Red Spot) was just past transit, very well placed, but so small! It was fairly obvious but just a tight, dark knot (nought? not.) in the SEB (Southern Equatorial Band), which itself was quite light. The NEB (Northern…) was dark and thick, and some “barges” were visible. The equatorial zone remains heavily shaded, darker than the temperate zones. One northern temperate band was visible. The GRS rotated about 2/3 to the limb while I observed, or so it seems to me as I write this. I tried a variety of color filters, including blue, green, and yellow. The blue highlighted the bands and GRS the best, as one would expect. Green and yellow both gave interesting interpretations but were ultimately not that helpful. Of the Galilean moons, I had just missed Io disappearing in eclipse as it turns out, and also just missed Ganymede emerging from eclipse at the other end of my observations. Oh well. Meanwhile, Europa was about 4 Jupiter diameters from the planet to the west. Callisto was about four Europa-Jupiter distances further to the west. I made a sketch at the eyepiece that shows the distances more or less. The GRS in the sketch is bigger than it appeared.

Moon, redux

Went back to the Moon for a bit after it cleared the tower, as it were. Took another stab at the Apollo 11 craters, but no. Poked around the southern highlands for a bit. I’ve always had a soft spot for Clavius, so I looked there for a bit. Noticed a few clouds moving in and wanted to get some Saturn time in, so moved there.


Even with deteriorating conditions, Saturn looked pretty good. Again, pushing the mag, it was just a bit much at 333 X, so ended up with the 266 X combo I hadn’t thought of earlier. The rings are tilted so that the other edges are about lined up with the edge of the disk. It’s just a bit past opposition (okay, a month past), so there is just a little bit of shadow on the rings right at the pole, or that’s what I’ve gathered. Any way, the rings kind of squish at that point. Not much color tonight, just a yellowish tint. Darker in the N temperate to polar region with a slightly dark band at the bottom. Very 3-D. Cassini Gap easily visible.


I took several handheld pictures and videos with my phone at the eyepiece for all three targets. Moon was best, of course, then Saturn. Jupiter was washed out. Clouds were moving in, and I was tired, so I washed out, too.

Best shot of the Moon for the night. North is right and West is down.
Best of Jupiter for the night, which is not that great. North is upper left, West is to the lower left. More or less.
Saturn. Not as impressive as seeing it live. You sort of see the dips where the rings and the disk limb cross, right? North is right.

You can see the full series of pictures I took at my Google Pictures album, >here<.