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Astronomy Edmonton
Royal Astronomical Society of Canada, Edmonton Centre. Promoting public awareness in astronomy, including local meetings & events. Most tweets by
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Astronomy Edmonton Dec 11
Fantastic capture, Siv. Did you see this meteor visually, & if so how bright would you estimate it to be?
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Siv Heang Dec 11
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Astronomy Edmonton Dec 10
TONIGHT. Public welcome!
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Damian Peach Dec 9
46P/Wirtanen on December 7th. Another recent view of the comet. The tail continues to remain very faint.
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Mel Priestley Dec 5
Oh please god take a hard pass on this proposal: sure they say it'll be used to promote "community events" now, but it'll really be a throbbing LED billboard for the highest bidder.
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Calgary RASC Dec 4
It’s a good mail day when you receive both of these great publications.
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Andy Grabia Dec 5
More light pollution and wasteful use of energy? It’s the most Edmonton thing you can do!
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Astronomy Edmonton Dec 3
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
8/6 😳 All references in this thread to "MDT" should read "MST"
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Astronomy Edmonton Dec 3
Terrific pass/es of International over Canada tonight with its new crew inc. Canadian astronaut David Saint-Jacques. Peaks highest & brightest due South just as Oilers broadcast starts at 18:30 MST. Step outside a couple minutes before then if you can. Thread/
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
7/6 (sorry!) 3rd pass of this evening is theoretically visible over but very marginal, as Station disappears into Earth's shadow just as it is rising, low in W at 20:03. Only an experienced observer might catch it We highly recommend the far better 18:27 - 18:30 pass
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Astronomy Edmonton Dec 3
Replying to @Astro_DavidS
6/6 Timing is good in that sky is fully dark, showing at its brightest. It peaks at 18:30, just when the broadcast of game is beginning but well before puck drop. Step outside for a minute, orient yourself south, & look up. Don't forget to wave to !
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
5/ Ground track of tonight's optimal pass at 18:30 MDT. Orbit is tilted to Earth's equator by 51.6° so it never quite gets to overhead in (+53.5°). This is as close as it gets, at a distance of 455 km from an observer near downtown. Now consider: 400 km of that is "up"
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
Sighting confirmed. We have very clear skies tonight, even as the air is a little crisp. One nice thing about passes in cold weather times is that they only last 6½ minutes at most.
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Astronomy Edmonton Dec 3
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
4/ Skymap over for best pass. Zenith (overhead) is centre of the circle, with southern horizon at its bottom edge. As it crests will pass directly above planet Mars but >2x as high & ~30x as bright!
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
3/ 2nd pass is best. Sky will be fully dark, but fades into Earth's shadow < 30 seconds after its highest point. 1st visible: 18:27 MDT in W Highest point: 18:30 MDT *due* south at an altitude of 63° (overhead = 90°, horizon = 0°). Fades into Earth's shadow: 18:31
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Astronomy Edmonton Dec 3
Replying to @EdmontonRASC
2/ 1st pass is in civil twilight as ISS passes Because Sun is not far below horizon (~6°) it will illuminate for entire pass: First visible: 16:51 MDT (SW) Max altitude: 16:54 (SSE, not quite halfway up sky) Last visible: 16:57 (due E) will be brightest object in sky
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Astronomy Edmonton Dec 3
1/ Here's a map of the best ISS passes Canada-wide. Best for Greater Edmonton (or anywhere in Alberta) is same as for Calgary (shown), from 18:27 to 18:30. But we also can see on both the previous & the following orbits, at intervals of ~96 minutes.
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Astronomy Edmonton Dec 3
Great to see another Canadian astronaut aboard International ! Congrats to David Saint-Jacques, 1st Canadian since to achieve Earth orbit. You can follow him will make THREE visible passes over this evening! Details to follow
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