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January 23, 2026
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HomeJosef Chlachula

Josef Chlachula

Profile picture of Josef Chlachula

@josef

Active 3 hours, 19 minutes ago
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  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 1 year, 10 months ago

    Starlink 1176 was launched on January 29, 2020 from Air Force Eastern Test Range, Cape Canaveral FL

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    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 1 year, 10 months ago

    If you know time of the image(s) set that time at https://stellarium-web.org/skysource/Bode'sGalaxy?fov=4.7939&date=2024-02-29T02:10:34Z&lat=44.08&lng=-92.51&elev=0 and you may see that satellite passing by.

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 1 year, 11 months ago

    Most likely I was able to see 8 mag comet 12P/Pons-Brooks by 10×50 binocular from light polluted backyard.
    See at stellarium-web.org .

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    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 1 year, 11 months ago

    Very nice GIF image comparing images M101 with supernova about 250 days(8 months 5 days) apart!

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    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 4 months ago

    This morning at about 4:45 AM I was able to see comet C/2023 P1 Nishimura from Root River Park by binocular 10×50. Comet was left from M44. See Stellarium.

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    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 8 months ago

    Great picture of the supernova 2023ixf! Looking at stars around like at Stellarium-web  supernova could be brighter than 12 mag. According to https://www.rochesterastronomy.org/sn2023/sn2023ixf.html it could be around 11 mag.
    See also AAVSO chart and labeled stars or brightness reports.

  • Profile picture of Josef Chlachula

    Josef Chlachula posted a new activity comment 2 years, 8 months ago

    Well, there will be tonight 5/20 visible 22 Starlinks G6-30 from 22:34 for about 4 minutes at SouthWest entering Earth shadow inside constellation Leo. Magnitudes only 2.8 and I guess they will be spread 5 times more than yesterday.

    ISS is passing above Cassiopeia at ~22:02 and again at ~23:39 ending in shadow in Cepheus.

    I will fiddle with my…[Read more]

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  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 9 months ago

    There is just now Kp 7.67 – storm, higher probability to see aurora, see https://www.swpc.noaa.gov/news/update-g4-storm-observed-sunday-april-23-2023

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 9 months ago

    Great picture of the M81 and M82 with 80 mm (3.14 inch) aperture with total 16 minutes exposure. Thanks!

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 10 months ago

    I see Northern light even from my backyard, no color though. It could be stronger about midnight see https://services.swpc.noaa.gov/images/aurora-forecast-northern-hemisphere.jpg

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 2 years, 11 months ago

    Great Trapezium area exposures animation! Basically we can see nebula isophots on each grooving exposure. Thanks for sharing.

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 1 month ago

    Jim, I asked ChatGPT at https://chat.openai.com/chat  “Explain why is ecliptic so high now in Winter” and here is answer:

    The ecliptic is the plane in which the Earth and other planets in our solar system orbit around the sun. The tilt of the Earth’s axis causes the seasons, including winter, and determines the angle at which the ecliptic…[Read more]

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 1 month ago

    Well, it is very simple. Mars is in Taurus, an zodiacal constellation, not so far from bright Aldebaran. Ecliptic in this area has high positive declination. Actually, Mars is not too far from ecliptic. Mars has today ecliptical latitude  2°20′, not much.

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    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 1 month ago

    And Mars is gone behind Moon. It was  awesome!

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Astronomers around the World in the forum General Discussion 3 years, 1 month ago

    Astronaut Scott Kelly wrote on November 24, 2022 https://twitter.com/StationCDRKelly/status/1595925959081070592

    Ukraine from space yesterday. The dark area above the Black Sea. Among many other things today I’m thankful I have electricity and heat.

    UA

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 3 months ago

    Bob, well done images of the 40 Eridani! Thanks for bringing attention to the White Dwarfs – https://rochesterskies.org/40-eridani-b/

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 3 months ago

    I called yesterday Eagle Bluff general number and left message (at I believe option 6) to switch off parking lights. No answer so far 🙁

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 3 months ago

    Public observing night at Elgin I spent a lot of time observing carbon star V Aql. I set my own user object with J2000 coordinates, but I was puzzled, why 10″ SCT with goto Autostar II is always off.  Day later I found that Autostar most likely is using coordinates RA/Decl for current time with current precession. One can find such coordinates a…[Read more]

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 3 months ago

    Bob, this is great picture of Jupiter! You should use club 10″ SCT more often.

  • Profile picture of Josef Chlachula

    Josef Chlachula replied to the topic Observing tonight? in the forum General Discussion 3 years, 4 months ago

    Great picture, Bob! Yes, the color is much closer to the visual experience. I put update2 at https://rochesterskies.org/carbon-star-v-aql/. I don’t understand “on the 9-6 picture was used“. 6 pictures was stacked? Or 9?

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Jan
23
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6:00 pm CANCELED: Public Presentation & ... @ Oxbow Park
CANCELED: Public Presentation & ... @ Oxbow Park
Jan 23 @ 6:00 pm – 7:30 pm
CANCELED: Public Presentation & Sky Observing 2026-01/23 @ Oxbow Park | Byron | Minnesota | United States
CANCELED due to extremely cold weather Presentation by Randy Hemann When the Sky Glows: How the Northern Lights Work Auroras have inspired myths and scientific inquiry across various cultures and throughout history. In this talk, we will explore the interactions between solar activity, Earth’s magnetic field, atmospheric chemistry, and human perception that create these stunning light displays. The colors and [...]
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10
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7:00 pm RAC Monthly Meeting February 2026 @ RCTC Room EA103 (use the southeastern entrance to RCTC.)
RAC Monthly Meeting February 2026 @ RCTC Room EA103 (use the southeastern entrance to RCTC.)
Feb 10 @ 7:00 pm – 9:00 pm
Please come to the Rochester Astronomy Club monthly meetings! These meetings are free and open to the public. Each month we will try to bring you a different presentation and share observing notes and tips. Agenda will be published on the Sunday before the meeting. We are offering these meetings in a hybrid fashion, you can attend either in person [...]
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6:30 pm Public Sky Observing 2026-02/27 @ Oxbow Park
Public Sky Observing 2026-02/27 @ Oxbow Park
Feb 27 @ 6:30 pm – 8:00 pm
Public Sky Observing 2026-02/27 @ Oxbow Park | Byron | Minnesota | United States
Presentation by Randy Hemann When the Sky Glows: How the Northern Lights Work Auroras have inspired myths and scientific inquiry across various cultures and throughout history. In this talk, we will explore the interactions between solar activity, Earth’s magnetic field, atmospheric chemistry, and human perception that create these stunning light displays. The colors and visibility of auroras depend on altitude, [...]
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