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Perseids 2005

Most of the MBK Team's 2005 Perseid observations were done at the Youth astronomical research camp 2005 (MART 2005) that took place from August 5 to 14 at Trije Kralji on Pohorje Mountain, Slovenia.

OBSERVATIONS

Several observational methods were used. Fourteen observers covered meteor activity with visual observations. Photographic, including all-sky, and video observations were also employed. A radio forward scatter receiver was installed at a distant location but the observations will not be covered in this paper.
Fourteen observers covered six clear nights with the observations around the maximum of the Perseids. In 208 hours of observations 7556 meteors were recorded with 4692 of them being Perseids (see Table below). Other showers were also seen: 120 Alpha Capricornids, 181 Kappa Cygnids, and 455 diverse Aquarids.

Table 1: Visual observer's statistics for the 2005 Perseids.
Observer IMO code Teff [h] Total Spor PER Other
Mitja Govedic GOVMI 31.53 995 252 630 113
Javor Kac KACJA 25.53 836 207 543 86
Jaka Dobaj DOBJA 22.23 960 257 615 88
Petra Brence BREPE 21.75 476 170 257 49
Martin Cokl COKMA 19.74 610 224 316 70
Tadej Medved MEDTA 19.28 764 183 502 79
Manca Behric BEHMA 19.02 529 197 277 55
Matej Savli SAVMT 15.11 378 131 155 92
Jure Atanackov ATAJU 11.31 970 216 682 72
Gregor Kladnik KLAGR 6.95 265 65 173 28
Marusa Kuk KUKMA 4.69 144 67 77 
Samo Smrke SMRSA 4.35 264 39 217 8
Aleksandra Brglez BRGAL 3.45 102 50 52 
Janez Kos KOSJN 3.06 263 51 196 16
totals 208.00 7556 2108 4692 756

ANALYSIS

Population index of the Perseids
The population index r was calculated for six nights of the camp (Figure 1 left). Population index is almost constant at r = 2.1 ± 0.1 for most of the period. A large error bar on the night of August 7/8 is due to a low number of Perseids seen. The lowest value of r = 1.87 ± 0.08 was reached at about 21h20m UT on 2005 August 12 but the population index is almost constant at r = 2.0 ± 0.1 for the whole night.


Figure 1: Population index profile of the Perseids during MART 2005 (left) and a detailed profile for the night 2005 August 12/13 (right).

Activity profile of the 2005 Perseids
Activity profile was calculated using population indices from Figure 1. For the nights prior to MART 2005 we used r = 2.6 for the calculations. Our observing run starts on 2005 July 28/29 with the Perseid ZHR = 7 ± 3. The last observing night before the MART 2005 was 2005 August 1/2 with the Perseid ZHR = 10 ± 2. The Perseid rates at the start of the Camp were 12 ± 1 Perseids per hour. The rates then climbed steadily to 22 detailed Perseid activity profile for the night 2005 August 12/13 is shown in Figure 2. The highest activity observed was at about 70-80 meteors per hour ZHR with some fluctuations during the night.


Figure 2: Activity profile of the Perseids during MART 2005 (left) and a detailed profile for the night 2005 August 12/13 (right).

Photographic observation results
During the Camp 89 meteor trails were secured on film or digital cameras. Unfortunately only 21 of the meteors had their exact time registered. Other meteors have errors in Right Ascension of the order of about 2 minutes. Tracings plot was made with Radiant 1.43. The position with most intersections is located at a = 48 and d = 58, close to the position listed in ephemerides (McBeath 2004).
The highlight of the Camp was a -7th magnitude fireball that was recorded on August 11, 2005 at 01h57m50s UT and was captured with a digital camera and also on our all-sky camera.


Figure 4: A -7th magnitude meteor in Taurus/Perseus was caught with Canon 300D digital camera on August 11, 2005 at 01h57m50s UT. Photo by: Simon Krulec and Peter Atanackov.

Video results
Meteor activity was recorded during six clear nights. More than 400 meteors were recorded with most of them being the Perseids (Table 2). Table 2: Video observation summary for the camera METKA.
Teff nights meteors Spor PER KCG SIA SDA CAP NDA NIA
44h15m 6 411 89 281 10 10 8 5 5 3

Video adiant positions
Radiant position for the maximum night (at d = 140.3) was calculated using 155 meteors and is located at a = 46.7 and d = 59.3, almost exactly the position listed in the ephemerides (McBeath 2004). The radiant coordinates in other nights are listed in Table 3.

Table 3: Video radiant coordinates. The last column gives the number of meteors used in the calculation.
ladused/all
133.536.257.634/41
135.438.156.927/33
136.439.257.955/61
137.439.358.959/68
140.346.759.3155/173

Conclusion
The tenth summer Youth astronomical research camp was a great success again. Six nights from nine possible were clear enough to allow meteor observations. The highest Perseid rates were observed on 2005 August 12/13 with the maximum ZHR = 89 ± 6. Several novice observers were introduced to meteor astronomy at the Camp.

Acknowledgements
We want to thank Orion Astronomical Society and Ustvarjalno astronomsko drustvo for organizing the Camp. The Camp was supported by the grant from Ministry of Higher Education, Science and Technology of the Republic of Slovenia. We also want to thank the observers for obtaining and handling their data.

References

  • Lyytinen, E. (2005): Are there any prediction about Perseids 2005? meteorobs mailing list, June 13, 2005.
  • McBeath, A. (2004): 2005 Meteor Shower Calendar, IMO INFO, 2-04, pp. 9-10.
  • Vaubaillon, J. (2005): 2005 Perseids

    Papers published about Perseids 2005:
    Jure Atanackov, Javor Kac, Jure Zakrajsek. Meteorski roji v avgustu in septembru. Spika 13-7/8 (2005): 330-1
    Javor Kac. Analiza opazovanj Perzeidov 2005. Spika 13-12 (2005): 533-4
    Javor Kac. Perseids 2005 - first results from MBK Team observations. Proceedings IMC Oostmalle 2005 (in press)

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