Time: 22:45-01:00 (local time)
Observing site: El Retamar (2100m), Teide N.P., Tenerife, Spain
Instrument: L80/400mm (3” refractor)
Darkness of the background sky: 1
Weather: Clear sky, gusty, fresh breeze, +8 C
Objects observed: NGC 2451, 2546, 2467, 2571 and 2567
During my fourth and last night of observing on Mt. Teide, I was observing 5 objects in the constellation of Puppis. During the night it was very windy, and I was tired. Because of combination of these two factors, I didn’t felt motivated to start observing, but nevertheless I was able to motivate myself, and I’m glad I made those 5 observations during the night.
During the night I measured lowest SQM readings during my trip, at lowest it was as low as 21.05. This is still a good reading especially in terms of Finland, but in terms of Teide it is a lowered reading. I din’t know reason for this, but actually it could have been caused by dust on my SQM -meter. Before leaving, I wiped off some dust from the sensonr of the SMQ -meter, and the reading jumped to 21.25. That is higher, but still considerably lower than the best readings I usually had during previous nights.
My first object was NGC 2451, an open cluster located in Puppis, four degrees NW from zeta Puppis. With my instrument, it is in the same field with NGC 2477, which I has observed already earlier. Of NGC 2451 I wrote following notes:
A pretty large and bright starred cluster, not very concentrated but it is still well detached. In the middle of this cluster, there is a bright-starred triangle, the star in the upper right corner if this triangle is intensively red! NGC 2477 was visible as a nebulous patch 1,5 degrees east from the cluster.
NGC 2451 observed with 3” refractor.
NGC 2546 is an open cluster in Puppis, located 3 degrees NE from zeta Puppis. Of thos object, I wrote following notes:
an open cluster, that is elongated in NW-SE -direction. The cluster is rather faint-starred. It is not very concentrated, and it is moderately detached from it’s background.
NGC 2546 observed with 3” refractor.
NGC 2467 is an open cluster+nebula combination in the northern part of Puppis, located two degrees SE from xi Puppis. Of this object, I wrote following notes:
A rather faint, roundish open cluster+nebula. The cluster itself wasn’t much visible, but the nebula was easy and obvious. The nebula was already weakly visible without OIII filter, but with the filter it became visible very well.
NGC 2467 observed with 3” refractor.
NGC 2571 is an open cluster located in eastern part of Puppis, 6 degrees SE from rho Puppis. Of this object I wrote following notes:
A small, faint-starred cluster. The cluster is moderately detached and -concentrated.
NGC 2571 observed with 3” refractor.
NGC 2567 is an open cluster in Puppis, it is located less than degree south from NGC 2571. Of NGC 2567 I wrote following notes:
A small, faint and compact cluster, well concentrated and detached.
NGC 2567 observed with 3” refractor.
So, that was my fourth and last night observing of my 2nd Tenerife observing trip! During the trip, I made in total 31 observations during four nights. Objects that I observed, Included fro example Messier 68 and 83, NGC 5128, 5139, 2477, 3372 and 2237+2244. During the trip I was also able to spot the northernmost part of the Southern Cross and I also spotted alpha Centauri, which is the nearest stur to us after Sun. I also finished observing Messier catalogue and photographed the Milky way.
I was doing all of my observations in the same spot every night. The spot was called El Retamar, and it located just outside the caldera in the SW side of the caldera. That was because I had already noticed, that the sky won’t get much darker deeper in the caldera so it doesn’t pay off to drive further, it just takes more time and there is more traffic interference. Observing conditions were good during every night, it was clear during all of my observing nights, but this time it was often very windy. The wind was sometimes very strong, and that was causing problems for my observing attemtps.
After this observing trip I still have 28 Caldwell objects and 20 Hidden Treasures -objects to be observed. Besides that, I still have to observe objects between -62 to -90 from somewhere in southern hemisphere. But that’s going to be hopefully a new trip sometimes in future.