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orion25

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Posts posted by orion25

    T Lyrae

    in Observing and Imaging Double and Variable Stars

    Posted · Edited by orion25

    15 hours ago, Nik271 said:

    Are you sure you don't mean T Lyrae?

    Theta Lyrae while being very orange (K class) is not a carbon star and as far as I know does not vary in brightness. In fact at mag 4.5 it is easily visible from dark locations.

    T Lyrae on the other hand is a very red carbon star indeed and dim, so not visible to the naked eye. Last time I looked at it last summer it was gorgeous.

    Oh, my stars! Thanks, Nik271. T Lyrae is what I saw and imaged Friday night. Yes, it is gorgeous :)

    • Like 1

    T Lyrae

    in Observing and Imaging Double and Variable Stars

    Posted · Edited by orion25

    Thanks to #PHIL53 for suggesting I check out this spectacular red giant carbon star in Lyra, not too far from the "double-double" Epsilon Lyrae. It's not visible to the naked eye and can vary in brightness from magnitude 5 to 11. Here is a prime focus shot:

    ASTRONOMY-THETALYRAEPRIMEFOCUS6-02-23.thumb.jpg.9ec590e22ddffdd7008a88351b7fa68d.jpg

     

    Cheers! Reggie

    • Like 11

    Hind's Crimson Star 2020

    in Observing and Imaging Double and Variable Stars

    Posted · Edited by orion25

    On 14/02/2023 at 03:46, PHIL53 said:

    ...and for the summer season, would advise to try and catch another nice little red star,  T Lyrae, not far from Vega (on the opposite side of the famous double/double...) 😉

    Boy, were you right, @PHIL53! T Lyrae is a striking red carbon star! I just saw (and imaged) it for the first time Friday night. Thanks for the suggestion! :D

    Regards,

    Reggie

    • Like 1

    Archaeoastronomy of the Ocmulgee Earth Lodge (Macon, Georgia US)

    in History of Astronomy

    Posted

    2 hours ago, SwiMatt said:

    This is so interesting, thank you! 

    I don't think it's surprising to find that both Mesoamerican cultures and Missisippian culture could have independently developed rites and knowledge around a feature as prominent as Venus. I would expect to find the same in Old World cultures, althought it's so hard to know due to the almost complete lack of ethnographical evidence from prehistory!

    There is also evidence of red cedar structures (called "Woodhenges") built by the Mississippians to acknowledge the equinoxes and the solstices, like Stonehenge in Great Britain. Here is another informative article about the Cahokia culture, the largest Mississippian culture we know of north of Mexico:

    https://www.washingtonpost.com/wp-srv/national/daily/march/12/cahokia.htm

     

    Regards,

    Reggie :)

    • Thanks 1

    Archaeoastronomy of the Ocmulgee Earth Lodge (Macon, Georgia US)

    in History of Astronomy

    Posted

    On 26/05/2023 at 14:22, SwiMatt said:

    This looks very cool @orion25 ! Do we know anything about the astronomical knowledge and rituals of the Mississippian culture? Do we have any anthropological knowledge of this, beyond these alignments with stars?

    Thanks for reading my post, my friend. Information about Mississippian cosmology is limited but research indicates only a basic knowledge of the cosmos, based on the four cardinal directions and movements of the sun and the moon. Seasonal factors in relation to the sun were obviously important to the Mississippians who were an agricultural people. The "Harvest" and "Hunter's" moons likely assisted them with nighttime harvesting and hunting. It is unknown if eclipses were considered significant but there is some evidence of the acknowledgment of Venus as a "morning/evening star" from iconography on gorgets (round pendants) discovered at archaeological sites. Research indicates that Mississippian astronomy was likely NOT to have been significantly influenced by Mesoamerican culture (as once thought) due to the latter's differing point of reference for the four cardinal directions and other specific cultural views of the sky, but Venus was important in Mesoamerican cosmology also.  Here is an interesting read:

    http://rla.unc.edu/Mdvlfiles/paper/Daniel-Hartung 1981.pdf

    • Like 1

    Venus Using the Antlia UV Filter

    in Imaging - Planetary

    Posted

    I finally got to test out my new Antlia UV filter with my 180mm Mak/ASI 224mc imaging setup and got some pretty good results. It cost about half the price (around $200 US) of the Baader or Astrodon UV filters (around $400) and seems to show similar performance to the less expensive Astromania UV filter (part of 3 filter set: UV/IR/CH4 pass, for about $150 US). Focus can be a challenge, but you can no doubt get some cloud detail! 

    ASTRONOMY-VENUS(UVANTLIAFILTER)5-26-23.jpg.ddaa4142cfa91bc244512479eac82354.jpg

    I deactivated the debayer in Firecapture and imaged Venus in monochrome to eke out as much detail as possible.

    Cheers!

    Reggie 🤩

    • Like 3

    Venus in UV First Image (Astromania UV Filter)

    in Imaging - Planetary

    Posted

    8 hours ago, Kon said:

    Looking nice and still pulling details with the mak. Yes it's a nice filter for the price. It's good you are not suffering from the ghosting on your colour camera. I have removed the AR window from my asi462mm to get that extra signal but others here might advise against due to potential issues with dust on the sensor.

    Regarding focus it's quite difficult with the UV unless seeing is very good. I am only capturing during daylight and when the sun is still high up as the atmosphere is more stable. I noticed you have colour on your images. If that's only UV filter process it as monochrome.

    Thanks for the advice, Kon :) Your post was really informative and helped a lot. Thanks for sharing your experiences. I got an Antlia UV filter on the way.

    • Like 1

    Venus in UV First Image (Astromania UV Filter)

    in Imaging - Planetary

    Posted

    I got my Astromania Planetary filter set last week and played with some imaging using my Orion 180mm Mak and ASI 224mc camera. I wasn't expecting too much because of the cheap price of the set (around $80 US for the UV, IR, and methane filters) but I was pleasantly surprised to get some good detail! This is a first image that I plan to improve upon. No ghosting, but it seems to be a bit out of focus. I have the Antlia UV filter on the way which is a bit more expensive (around $200 US), but still cheaper than the Baader or Astrodon; it has great specs and I expect good things from it.

     

    ASTRONOMY-VENUS(UVFILTERASTRO)5-04-23B.jpg.4d7fb97a41957221df4d2cc7470d564f.jpg

     

    Cheers!

    Reggie

    ASTRONOMY - VENUS (UV FILTER ASTRO) 5-04-23 A.jpg

    • Like 7

    Astromania filters for planetary imaging (review)

    in Imaging - Planetary

    Posted

    Wow! Thanks for sharing your experiences with this set. I just got my Astromania filters and I'm playing around with my Venus images. I got some good UV detail surprisingly with my 180mm Mak. Despite having a color cam (the ASI224mc) I didn't get the ghosting effect. I'll post the images, soon. I agree that this filter set is a good bargain to get a UV.

    Reggie

    • Like 1
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