Alpha Capricornids meteor shower peaks on July 30-31, 2013

The Alpha Capricornids is a meteor shower that lasts for about 6 weeks from July 3rd to August 15th, with this year's peak occurring at the end of July. Despite being an infrequent shower with rarely more than 5 meteors per hour visible, it's worth watching out for the Alpha Capricornids as the meteors are bright and often include spectacular colourful fireballs.

Unlike some of the other annual meteor showers, Alpha Capricornids don't have a well-defined peak. Instead, maximum activity is spread over a "plateau like" period which varies from year to year. This year, July 30th and 31st are predicted to be the days of peak activity. A waning crescent Moon between 45% and 30% illuminated is visible at this time, but should not significantly interfere.

Discovery and Parent Body

The meteor shower was discovered by Hungarian astronomer Miklos von Konkoly-Thege in 1871. It was not until 2009 that Peter Jenniskens and Jeremie Vaubaillon identified the parent body as asteroid 2002 EX12. This object was subsequently identified as a comet and renamed as 169P/NEAT.

It's believed that the bulk of the cometary dust particles will not cross Earth's orbit for another 300 years and as a result the shower could be a major calendar event from 2220 to 2420 AD.


The shower radiant is located in Capricornus, close to the constellation boundary with Aquila and Aquarius. The meteors are well seen from all over the globe, with the tropics being the preferred location. Southern temperate latitudes are slightly better placed for observation than their northern counterparts. Just after midnight the radiant is position towards the south for northern hemisphere observers, overhead from the tropics and more towards the north for those located further south.

Alpha Capricornids Radiant and Star Chart

Alpha Capricornids Radiant and Star Chart - pdf format

The best time of night to observe the meteor shower is around midnight or during the early hours of the morning. The Alpha Capricornids are noticeably slow moving meteors (velocity 23 km/s) and as previously mentioned, often produce brilliant colourful fireballs that leave a trail of dust and debris as they disintegrate in the Earth's atmosphere.

As with all meteor showers the meteor trails often streak across the sky quite a distance from the actual radiant point, in many cases in excess of 30 degrees and therefore can effectively appear anywhere in the sky. It's therefore a good idea not to look directly at the radiant itself, but scan a large area of the sky around it.

Alpha Capricornids Data Table 2013

Meteor shower nameAlpha Capricornids
Radiant constellationCapricornus
ActivityJuly 3rd -> August 15th
Peak DateJuly 30th / 31st
RA (J2000)20hr 28m
Dec (J2000)-10d
Speed (km/s)23
Parent body169P/NEAT
NotesProduces a few slow moving but relatively bright meteors including some fireballs

Comet 169P/NEAT Data Table (at epoch May 15th, 2007)

ClassificationJupiter-family comet (NEO)
DiscovererNEAT (Near-Earth Asteroid Tracking)
Discovery dateMarch 15th, 2002
Aphelion distance (AU) 4.60176
Perihelion distance (AU)0.60660
Orbital period (years) 4.20266
Last perihelion November 30th, 2009
Next perihelion February 12th, 2014
NotesPreviously known as asteroid 2002 EX12

Sky Highlights - July 2016

Mercury, Venus and Jupiter
Mercury, Venus and Jupiter visible together in the evening sky from southern and tropical latitudes from July until September 2016

Moon and Jupiter
Jupiter and the waxing crescent Moon form a nice grouping on July 9, 2016 with an occultation visible from the southern tip of Africa

Moon, Mars, Saturn and Antares
The Moon, Mars and Saturn close together during evenings from July 14 to 16, 2016

Meteor Shower
Delta Aquariids (Aquarids) meteor showers peak on July 29, 2016

R Aquilae within binocular range
Mira type variable star R Aquilae (R Aql) now within binocular range

The Planets
This Month's Guide

Algol Minima
Algol eclipse dates and times for July 2016

PanSTARRS (C/2013 X1) a binocular and small telescope comet.

Northern Hemisphere
West:- Jupiter (mag. -1.8)
South:- Mars (mag. -1.4 to -0.8), Saturn (mag. +0.2)
Southwest:- Mars, Saturn
Southeast:- Neptune (mag. +7.8)
East:- Uranus (mag. +5.8)
South:- Neptune
Southeast:- Uranus

Southern Hemisphere
West:- Venus (mag. -3.9), Mercury (mag. -1.2 to -0.2) both second half of the month
West:- Jupiter
Northeast:- Mars, Saturn
West:- Mars, Saturn
Northeast:- Neptune
East:- Uranus
Northwest:- Neptune
North:- Uranus

Deep Sky
Naked Eye:-
Melotte 111 - Mel 111 - The Coma Star Cluster (Open Cluster)
Messier 44 - M44 - The Praesepe (Open Cluster)
NGC 869 and NGC 884 - The Double Cluster - Open Clusters
Binoculars / Small telescopes:-
Messier 13 – M13 - Great Hercules Globular Cluster
Messier 3 - M3 - Globular Cluster
Messier 81 - M81 - Bode's Galaxy (Spiral Galaxy)
Messier 82 - M82 - Cigar Galaxy (Starburst Galaxy)
Messier 27 - M27 - The Dumbbell Nebula (Planetary Nebula)

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