© Jacek Halicki 2016. Perseid meteor seen in 2016 from Poland.

α–Scorpiid meteor shower

Thu, 28 Apr 2016 (722 days ago)

Dominic Ford, Editor
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Ashburn
The sky at

The α–Scorpiid meteor shower will reach its maximum rate of activity on 28 April 2016. Some shooting stars associated with the shower are expected to be visible each night from 20 April to 19 May.

Annual meteor showers arise when the Earth passes through streams of debris left behind by comets and asteroids. As pebble-sized pieces of debris collide with the Earth, they burn up at an altitude of around 70 to 100 km, appearing as shooting stars.

By determining the speed and direction at which the meteors impact the Earth, it is possible to work out the path of the stream through the Solar System and identify the body responsible for creating it. The parent body responsible for creating the α–Scorpiid shower has been tentatively identified as 2004 BZ74.

Observing prospects

The maximum rate of meteors expected to be visible is around 5 per hour (ZHR). However, this assumes a perfectly dark sky and that the radiant of the meteor shower is directly overhead. In practice, the number of meteors you are likely to see is lower than this, and can be calculated from the ZHR formula.

From Ashburn (click to change), the radiant of the shower will appear 12° above your south-eastern horizon at midnight. This means you are likely to see only around 1 meteors per hour, since the radiant will be low in the sky, reducing the chance of seeing meteors.

The radiant of the α–Scorpiid meteor shower is at around right ascension 16h20m, declination 24°S, as shown by the green cross on the planetarium above. All of the meteors will appear to be travelling directly outward from this point, as indicated by the white lines drawn above.

The Moon will be 21 days old at the time of peak activity, presenting significant interference in the pre-dawn sky.

To see the most meteors, the best place to look is not directly at the radiant itself, but at any dark patch of sky which is around 30–40° away from it. It is at a distance of around this distance from the radiant that meteors will show reasonably long trails without being too spread out.

The sky on 28 April 2016
Sunrise
06:14
Sunset
19:58
Twilight ends
21:39
Twilight begins
04:33

21-day old moon
Waning Gibbous

70%

21 days old

Planets
Rise Culm. Set
Mercury 06:46 14:02 21:18
Venus 05:53 12:28 19:02
Moon 00:53 05:55 10:58
Mars 22:15 03:07 07:56
Jupiter 15:11 21:40 04:13
Saturn 22:44 03:39 08:31
All times shown in EDT.

Source

The Handbook of the British Astronomical Association.

Image credit

© Jacek Halicki 2016. Perseid meteor seen in 2016 from Poland.

Ashburn

Latitude:
Longitude:
Timezone:

39.04°N
77.49°W
EDT

Color scheme