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rmobMeteor Shower Activity

Visual Meteor Showers CURRENT activity

Sunday 16th of December 2018
Shower Activity Maximum Radiant V r ZHR
Date λ⊙ α δ km/s
Antihelion Source ANT Dec 10 - Sep 10 March-April303.0 4
Quadrantids QUA Dec 28 - Jan 12 Jan 03 283.16 230 +49 41 2.1 120
Monocerotids MON Nov 27 - Dec 17 Dec 09 257 100 +08 42 3.0 2
Geminids GEM Dec 04 - Dec 17 Dec 14 262.2 112 +33 35 2.6 120
Comae Berenicids COM Dec 12 - Dec 23 Dec 16 264 175 +18 65 3.0 3
Dec. Leonis Minorids DLM Dec 05 - Feb 04 Dec 20 268 161 +30 64 3.0 5

RADIO Meteor Showers CURRENT activity

Sunday 16th of December 2018
Shower Activity Max λ⊙ Radiant Best observed Rate
Date 2000 α δ 50°N 35°S

Data sources : IMO

Abbreviations

  • α, δ: Coordinates for a shower's radiant position, usually at maximum. α is right ascension, δ is declination. Radiants drift across the sky each day due to the Earth's own orbital motion around the Sun, and this must be allowed for using the details in Table 6 for nights away from the listed shower maxima.

  • r: The population index, a term computed from each shower's meteor magnitude distribution. r = 2.0-2.5 is brighter than average, while r above 3.0 is fainter than average.

  • λ⊙: Solar longitude, a precise measure of the Earth's position on its orbit which is not dependent on the vagaries of the calendar. All λ⊙ are given for the equinox 2000.0.

  • V: Atmospheric or apparent meteoric velocity, given in km/s. Velocities range from about 11 km/s (very slow) to 72 km/s (very fast). 40 km/s is roughly medium speed.

  • ZHR: Zenithal Hourly Rate, a calculated maximum number of meteors an ideal observer would see in perfectly clear skies with the shower radiant overhead. This figure is given in terms of meteors per hour. Where meteor activity persisted at a high level for less than an hour, or where observing circumstances were very poor, an estimated ZHR (EZHR) is used, which is less accurate than the normal ZHR.

  • TFC and IFC: Suggested telescopic and still-imaging (including photographic) field centres respectively. β is the observer's latitude ('<' means 'south of' and '>' means 'north of'). Pairs of telescopic fields must be observed, alternating about every half hour, so that the positions of radiants can be defined. The exact choice of TFC or IFC depends on the observer's location and the elevation of the radiant. Note that the TFCs are also useful centres to use for video camera fields as well.