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About DHEB

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    Star Forming

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    Mostly visual, mostly variable stars.
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  1. Aldebaran occultation 23/2/18

    At least we stayed at the comfort of our homes. Imagine the good old days of astronomy, when we would have sailed during one year in terrible conditions to the other side of the planet just to find the sky clouded on the great night of our expected event.
  2. Aldebaran occultation 23/2/18

    I had the privilege of observing this occultation. It was completely unplanned, as I wasn't following or expecting to see this phenomenon. I just walked outside of the train station as I returned home and saw the sky was clear, looked up instinctively and saw Aldebaran right east besides the Moon. That was 1747 GMT+1. As I walked home I could see the star closer and closer to the Moon. By 1759 GMT+1 could I not see it anymore. By the time I arrived the star had already been occulted. Wonderful!
  3. Yes, I asked for a change recently. The new name reflects my main activity and focus in variable stars. It is basically my AAVSO observer code. I just checked and saw that R CrB will rise enough to be visible from my place at about 0130. As things are that time slot only works on weekends. Hopefully, it seems that we may have clear skies this night, so I may stay until that time. Of course, it will be a good time.to estimate T CrB too. Just hope I do not get frost bite waiting for Coronae Borealis ...
  4. Wonderful indeed, @SilverAstro. I have catched R CrB only once this winter. It is still a morning star and requires some logistics behind trees and houses. Perhaps I will get better chances as we approach spring.
  5. On the other hand, @Paz if you are interested in visual estimations I suggest you start with a star that has a longer period and a larger range, and that many observers observe, for example Mira, R Leo or khi Cyg. In that way you can learn to estimate a relatively easy and well observed star, having at hand lots of observations made by others to compare yours, and to learn to observe in a large range of magnitudes. Just my two cents.
  6. Observing and estimating variable stars is a joy, and also one that contributes to science if you report your observations to an organisation. You seem to have started well: a circumpolar star that may be followed the whole year and that is within the range of your scope. I suggest you spend some time "calibrating" yourself, comparing your observations to those of others. Watch out for very red stars, you may fall prey of the Purkinje effect. Have you read this fine introduction? Goodluck and welcome to this fascinating world!
  7. Sorry for being picky. The PSA states that there are 55 carbon stars marked with "(c)". Not 150. See introduction, page viii. Nice thread by the way
  8. Just in case someone is interested, SS Cyg is in outburst since a couple of days ago. I estimated it yesterday at 8.7 mag. Go get an estimate you too
  9. MN Sge

    Not familiar with this star. Seems to be one of the many poorly known stars out there. SIMBAD has some data though: MN Sge at SIMBAD. I would not attach too much value to the given magnitude range i VSX. May be it is just approximate.
  10. I like Geoptik bags very much and, indeed, have two of them. One problem I have witnessed though is that the inner material in both bags is prone to release a lot of red specks that attach electrostatically to whatever is inside. One not nice surprise for me was to find a lot of these specks deposited on the primary mirror of my Newtonian. I resorted to keep vacuum cleaning the interior of the bags often, but I guess a more fundamental solution would be to use a different inner material. I recently wrote to Geoptik a friendly email to tell about this issue but got no response. Sad.
  11. Unexpected highlight

    R Lep is currently about mag 9, according to observations reported to AAVSO. When in doubt you can always check the Light Curve Generator:
  12. Charles Messier.

    I doubt these numbers you are posting here. Where did you get them? The expansion rate is unlikely to be constant in the circa 1000 years since the supernova. Not being contentious, just skeptical about these figures. I have not a reliable reference at hand and Wikipedia does not mention this. I can look for a reference later. If anyone has one it is welcome.
  13. Who 'discovered' averted vision?

    Interesting. Shouldn't we say "discovered", instead of "invented"?
  14. Charles Messier.

    Although you may be right on M1 decreasing its brightness, I would say that if anything the increase in light pollution is by far the only culprit in any detection problem we may have nowadays.