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Posts Tagged ‘Perseids’

07/27/2017 – Ephemeris – Two meteor showers, one peaking another ramping up

July 27, 2017 1 comment

Ephemeris for Thursday, July 27th. The Sun rises at 6:23. It’ll be up for 14 hours and 49 minutes, setting at 9:13. The Moon, 3 days before first quarter, will set at 11:50 this evening.

We are in the season for meteor showers. Today the South Delta Aquariid Meteor Shower will reach peak. This is a not very active shower where the meteors will seem to come from low in the southeastern sky after midnight. The radiant will rotate to the south by 5 a.m. The moon won’t bother it for the next few days. The number of meteors seen will be under 20 per hour. This long-lasting shower will still add a few meteors when the famous Perseid meteor shower begin to appear, which is around now. These meteors will seem to come from the northeastern part of the sky, and will reach peak for us in the evening hours of August 12th. On that night the Moon will brighten the sky after 11:30 p.m. So for the next two weeks both shower meteors can be seen.

The times given are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Two meteor showers

The sky at 1 a.m. tomorrow morning, July 28, 2017 showing the South Delta Aquariid (DAqR) and Perseid (PerR) meteor radiants. Created using my LookingUp program.

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08/03/2015 – Ephemeris – The Perseids are coming!

August 3, 2015 Comments off

Ephemeris for Monday, August 3rd.  The Sun rises at 6:30.  It’ll be up for 14 hours and 35 minutes, setting at 9:06.   The Moon, half way from full to last quarter, will rise at 10:58 this evening.

After the Moon sets in the evening and morning hours for the next week and a half the numbers of meteors visible will increase each night.  These are members of the Perseid meteor shower of August.  The peak this year is expected to be during the 2 o’clock hour on the morning of the 13th.  These meteors are the result of debris left in the orbit of Comet Swift-Tuttle shed by innumerable visits to the inner solar system.  Every year at this time the Earth passes through this trail of debris which intersects its orbit giving rise to the meteor shower.  We call them the Perseids, because the appear to come from the direction of the constellation Perseus the hero, which is first seen in the early evening low in the northeast.

Times are for the Traverse City/Interlochen area of Michigan. They may be different for your location.

Addendum

Perseid radiant at 10:30 p.m.

Perseid radiant at 10:30 p.m.

Orbit of Comet Swift-Tuttle

Orbit of Comet 109P/Swift-Tuttle. Blue line is the comet’s orbit, coming from above (North). Credit NASA / JPL / Applet by Osamu Ajiki (AstroArts), and further modified by Ron Baalke (JPL)

The distances in the lower left corner are the comet’s current distances from the Earth and Sun.  AU is astronomical units the mean distance between the Earth and Sun.  The comet’s last pass through the inner solar system was in 1992.  Swift-Tuttle is now out just past the current position of the dwarf planet Pluto.  Link to the animation from which the above image was taken and other information on Comet Swift-Tuttle go to http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=109P;cad=1