Archive for August, 2020


Crazy scope deal: is closing out the Bresser Messier AR102S Comet Edition package

August 29, 2020

Yes, the awesome RFT with the strange design and incredibly long name is still around. Amazon is selling the package for $399 (link), BUT as of right now, has it for just $240 (link). You have to log in to see the price, which I did before making this screenshot. Considering that the tripod is actually stable with this scope, that the binoculars are actually good (don’t tell the bino snobs, but these came-with 7x50s are my favorite low-power glass!), and the eyepiece is fine as long as you don’t look at anything bright (on Saturn, it showed CA in my Maksutov, but it’s fine for deep sky), that is a cuh-ray-zee deal. The scope itself is a fine low-power, wide-field sweeper. It’s not a planetary scope, although its planetary performance can be improved with a sub-aperture mask. But for what it’s designed for–rich-field viewing of the deep sky–it’s terrific. If someone told me I had 5 minutes to grab gear for a Messier Marathon or they’d shoot me, I’d grab that scope, the 28mm RKE, a folding chair, and a water bottle, and be out the door with minutes to spare. You can find the rest of my blatherings about this scope under this tag (link).

If you have any interest in a rich-field telescope, pounce on this deal while it’s still around.


Summer observing: planetary nebulae

August 25, 2020

Messier and Caldwell planetary nebulae, modified from the Caldwell object star chart produced by Jim Cornmell at Both the original file and this modified version are released under a Creative Commons Attribution Share-Alike license (CC BY-SA 3.0).

This all-sky chart shows the planetary nebulae from the Messier and Caldwell catalogs. Horizon lines are for southern California for the next couple of weeks. I put this together for a little observing feature I’m writing for Nightwatch, the monthly newsletter of the Pomona Valley Amateur Astronomers. I don’t know how well this map will reproduce, which is why I’m stashing a high-res copy here, so I can link to it in the newsletter feature. I will eventually post the observing feature here, too, probably sometime next week after the PVAA members have had a chance to see it in Nightwatch.

EDIT: I’m too lazy to reformat the observing feature for the blog, but I will link to it: here you go.


Hideously belated observing report: Mercury transit on November 11, 2019

August 22, 2020

Not a ton to say about this other than that we saw it. London was home from school for Veteran’s Day. It was sunny, warm, and bright, and neither of us fancied spending a ton of time standing in the sun, so we limited ourselves to a few quick peeks rather than continuous observation.

About the only notable thing about the transit was our observing rig, which is probably the redneckest job I ever threw together. Most of my good gear was packed away at the back of the garage and I didn’t fancy digging it out, so I taped a pair of cardboard eclipse glasses over the front of the SkyScanner 100 to create a subaperture mask, taped some spare cardboard from a torn-up Amazon box over that to block all the filter-less areas, and set the whole rig on our green-waste bin. It was decidedly low-tech, but not as sketchy as it sounds–I taped everything very securely to the tube so none of it could fall off, because the risk of direct, unfiltered sunlight through a scope is nothing to joke about. Then London and I took turns shading each other’s faces so we wouldn’t be squinting against the sun while we observed.

I didn’t take any pictures, we just watched the crisp little BB of Mercury drift across the face of the sun. The “lenses” of the solar glasses are about an inch in diameter, so basically we turned the 100mm f/4 system into a 25mm f/16 system, and a light cone that long is pretty forgiving. Which reminds me, I’ve just been reading about people experiencing a pseudo-3D “marble” effect when viewing the moon through telescopes of 40mm aperture or less. I should make a 40mm aperture mask for my C80ED and see if I get that effect.

Anyway, thus ended the transits of the twenty-teens. I was fortunate to catch them all: the Venus transit on June 5, 2012 (observing report), one Mercury transit on May 9, 2016 (observing report), and this second Mercury transit on November 11, 2019. The next Mercury transits won’t be until the 2030s: November 13, 2032 (I’ll be 57), and November 7, 2039 (64). Then 2049 and 2052, 2062 and 2065, and 2078. I’ll be 103 if I make it to that last one. The next Venus transit won’t be until 2117, 142 years after my birth, so barring some kind of technological miracle I don’t reckon I’ll be seeing another. It was a privilege to see the one that I did.

Now transit season is over for a bit over a decade, so we’ll have to find other things to keep busy with. Fortunately the sky has much to offer. Stay tuned.


Hideously belated observing report: another Messier Marathon at the Salton Sea (from April 2019)

August 16, 2020

Although you’d never know it from the complete dearth of posting from October, 2018, to last month, I neither died nor gave up stargazing. I even had some pretty cool experiences, I just didn’t summon the energy to blog about them. I’m now going to engage in some retrospective pothole-filling, starting with my 6th and most recent Messier Marathon.

Terry getting his 5″ f/8 Meade reflector set up for an evening of deep-sky observing.

Terry Nakazono had gotten in touch and we decided to make a run to the Salton Sea on the evening of Saturday, April 6, 2019. After logging over 2000 deep-sky objects with telescopes of 4.5″ and smaller, Terry had finally allowed himself to indulge and had moved up to his 5″ f/8 Meade reflector, which he had mounted on an AZ4 alt-az.

I was feeling lazy and didn’t want to dig a bunch of gear out of the back of the garage, so I brought London’s XT4.5, which is just an astoundingly comfortable and convenient scope. It normally sits near the front of the garage and these days it probably gets hauled out more than all the other scopes we own combined, just because it’s so quick and gives such good views. If London takes it with him when he moves away someday, I will definitely get one for myself. You can see it here on the homemade stand I made for it a few years ago, to get it up to a comfortable height for seated observing.

I wanted to do a Messier Marathon, but April 6 is getting right to the end of the season, so I figured I’d have some trouble with the early evening objects like M74 and M77. In the actual event, it was way worse: between the light pollution from LA, Palm Springs, and Indio, some clouds in the northwestern sky, and some trees in that direction, I missed not only M74 and M77 but also the Andromeda galaxy (M31) and its satellites M32 and M110, as well as M33. So I started the marathon six objects down out of 110, and the best I’d be able to do if everything else went smoothly was 104 Messiers. Still, I figured what the heck, I’d done my first three marathons (linked here) without getting that many, and there was no shame in ending over 100, especially if I had an enjoyable night under the stars doing it. So I went for it.

How’d it go? Other than losing those six galaxies at the start, it was my easiest marathon ever. I had the Jumbo Pocket Sky Atlas and the Year-Round Messier Marathon Field Guide, a handwritten checklist (like my other last-minute Marathon, back in 2013), my favorite 7×50 binos, and a super-convenient scope. I only used 3 eyepieces: a 32mm Plossl for max FOV, a 28mm RKE, and a 12mm Plossl, which in the XT4.5 yielded 28x, 32x, and 75x, respectively. Once I was rolling, I used the 28mm RKE almost exclusively. The reputation of this legendary eyepiece is well-earned; for the kind of relaxed, low-power deep-sky work I prefer it is unparalleled. All the gear just sort of disappeared and I was cruising through the sky, having fun and enjoying a beautiful night out under the stars.

The dark horse: London’s XT4.5. The white knight: Terry’s 5″ f/8 Meade. Photo by Terry Nakazono.

A highlight of the evening was rocking through the Virgo-Coma galaxies. Ever since my first marathon, way back in 2010, I have always tracked how long it takes me to get through this area. That first time out it took an hour and a half, but I hadn’t logged many Messiers at that point so it was my first time seeing most of them. The next year it only took me 23 minutes, and since then it’s never taken me more than 17 or 18 minutes. My record is 16 minutes, set in 2011 with binos only, and I tied that this time out with the scope.

Our chariots to the stars. Photo by Terry Nakazono.

I knocked off at 11:30 with 64 objects logged, and slept until 3:00–easily my longest and most relaxing mid-Marathon break. I was back at the scope at 3:10 to log M57, and from then on it was smooth sailing through the morning objects. I set a new record for myself in the Sagittarius/Scutum area, logging 13 objects in 6 minutes. And honestly, a good chunk of that time was just writing them down. Once you know the positions of the objects, you can basically just sweep the scope or binos across the area and count them off as you go.

How I roll in the middle of the night: atlases and logbook on a folding table, water bottle on the ground where it’s not taking up valuable real estate. Photo by Terry Nakazono.

For the last few objects, I was basically waiting for them to crawl over the eastern horizon. Here are the times for the final five:

  • M72, 4:14 AM
  • M73, 4:15
  • M2, 4:17
  • M15, 4:20
  • M30, 4:50

Yes, I got M30, the squirrelly devil, and finished with a total of 104 objects, having bagged every single Messier beyond those six starting galaxies. In the long downtime between M15 and M30 I looked in on Jupiter and Saturn, and after the Marathon was over I plinked around in the summer constellations, checking out NGC objects until about 5:20, when the sky was getting bright. Then I hit the sack and slept for another four hours.

My log, handwritten in a Field Notes 4.75″x7.5″ notebook.

Thoughts afterward? More than any previous Marathon, this one was just fun. Maybe because I knew right out of the gate that I wasn’t going to break my previous Messier Marathon total (108 objects, in 2013 and 2016), I just relaxed and had a blast cruising around the sky. I’ve done enough Messier Marathons now that the process feels familiar, and it’s nice looking in on objects that (full confession) I don’t often check in on otherwise (looking at you, M73).

The secret to sleeping in late in the desert is to park the vehicle perpendicular to the rising sun and put your cots on the west side. That’s me sacked out closest to the truck, sleeping like a baby after a successful Marathon. Photo by Terry Nakazono.

Of course, I’m still hungry to log all 110 in one night. I think I might need even darker skies and better horizons than the Salton Sea, so I am seriously considering hauling myself eastward for the All-Arizona Messier Marathon. Maybe next spring, if this damned pandemic ever subsides.

Many thanks to Terry Nakazono for being a sterling observing buddy, and for taking many of these photos and giving me permission to post them. Until next time!