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Alpha Cygnids - a possible July minor meteor shower
Astrophysics · Submitted 2 Jul 1998
abstract compiled · 2026-09-23 · no language-model review
The authors' main claim Comparing the velocity distributions of 754 possible $\alpha$-Cygnids and 4339 sporadic events by $\chi^2$ and Kolmogorov-Smirnov tests we conclude that both distributions are different with probability very close to 1.0.
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The abstract, sentence by sentence
We present a comprehensive study of a possible $\alpha$-Cygnid meteor shower. Based on visual and telescopic observations made by Polish observers we estimate basic parameters of the stream. Activity of $\alpha$-Cygnids lasts from around June 30 to July 31 with clear maximum near July 18 (solar longitude $\lambda_\odot=116.5^\circ$). Maximal Zenithal Hourly Rates (ZHRs) are equal to $3.6\pm1.2$. The structure of the radiant analyzed by {\sc radiant} software is most compact for geocentric velocity of the events equal to 41 km/s, and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. Center of the radiant for the moment of maximum is $\alpha=302.5^\circ$ $\delta=+46.3^\circ$.We derive population index $r$ equal to $2.55\pm0.14$ from magnitude distribution of 738 possible members of the stream. Comparing the velocity distributions of 754 possible $\alpha$-Cygnids and 4339 sporadic events by $\chi^2$ and Kolmogorov-Smirnov tests we conclude that both distributions are different with probability very close to 1.0. Telescopic observations strictly confirm the results obtained from visual observations. The smallest values of $\chi^2$ parameter we obtained for the geocentric velocity equal to 40 km/s and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. The center of the radiant for moment of maximum is $\alpha=304.9^\circ$ $\delta=+46.2^\circ$. In spite of making many photographic exposures we still have no photographic or video confirmation of the existence of this stream.
background contribution method result interpretation main claim
| # | sentence | role | the authors' own work | states the main conclusion | strength |
|---|---|---|---|---|---|
| s0 | We present a comprehensive study of a possible $\alpha$-Cygnid meteor shower. | contribution 1.00 | 0.85 | 0.07 | hedged possibility 0.79 |
| s1 | Based on visual and telescopic observations made by Polish observers we estimate basic parameters of the stream. | method 0.90 | 0.88 | 0.03 | asserted 0.97 |
| s2 | Activity of $\alpha$-Cygnids lasts from around June 30 to July 31 with clear maximum near July 18 (solar longitude $\lambda_\odot=116.5^\circ$). | result 1.00 | 0.85 | 0.20 | asserted 0.99 |
| s3 | Maximal Zenithal Hourly Rates (ZHRs) are equal to $3.6\pm1.2$. | result 1.00 | 0.90 | 0.12 | asserted 1.00 |
| s4 | The structure of the radiant analyzed by {\sc radiant} software is most compact for geocentric velocity of the events equal to 41 km/s, and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. | result 0.97 | 0.92 | 0.06 | asserted 0.99 |
| s5 | Center of the radiant for the moment of maximum is $\alpha=302.5^\circ$ $\delta=+46.3^\circ$.We derive population index $r$ equal to $2.55\pm0.14$ from magnitude distribution of 738 possible members of the stream. | result 1.00 | 0.95 | 0.10 | asserted 1.00 |
| s6 | Comparing the velocity distributions of 754 possible $\alpha$-Cygnids and 4339 sporadic events by $\chi^2$ and Kolmogorov-Smirnov tests we conclude that both distributions are different with probability very close to 1.0. | result 0.89 | 0.96 | 0.32 | asserted 1.00 |
| s7 | Telescopic observations strictly confirm the results obtained from visual observations. | result 0.91 | 0.89 | 0.07 | asserted 1.00 |
| s8 | The smallest values of $\chi^2$ parameter we obtained for the geocentric velocity equal to 40 km/s and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. | result 1.00 | 0.97 | 0.05 | asserted 1.00 |
| s9 | The center of the radiant for moment of maximum is $\alpha=304.9^\circ$ $\delta=+46.2^\circ$. | result 1.00 | 0.93 | 0.05 | asserted 1.00 |
| s10 | In spite of making many photographic exposures we still have no photographic or video confirmation of the existence of this stream. | limitation 0.95 | 0.95 | 0.08 | asserted 1.00 |
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The paper
Original abstract
We present a comprehensive study of a possible $\alpha$-Cygnid meteor shower. Based on visual and telescopic observations made by Polish observers we estimate basic parameters of the stream. Activity of $\alpha$-Cygnids lasts from around June 30 to July 31 with clear maximum near July 18 (solar longitude $\lambda_\odot=116.5^\circ$). Maximal Zenithal Hourly Rates (ZHRs) are equal to $3.6\pm1.2$. The structure of the radiant analyzed by {\sc radiant} software is most compact for geocentric velocity of the events equal to 41 km/s, and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. Center of the radiant for the moment of maximum is $\alpha=302.5^\circ$ $\delta=+46.3^\circ$.We derive population index $r$ equal to $2.55\pm0.14$ from magnitude distribution of 738 possible members of the stream. Comparing the velocity distributions of 754 possible $\alpha$-Cygnids and 4339 sporadic events by $\chi^2$ and Kolmogorov-Smirnov tests we conclude that both distributions are different with probability very close to 1.0. Telescopic observations strictly confirm the results obtained from visual observations. The smallest values of $\chi^2$ parameter we obtained for the geocentric velocity equal to 40 km/s and for the drift of the radiant (in units $^\circ$/day) equal to $\Delta\alpha=+0.6$ $\Delta\delta=+0.2$. The center of the radiant for moment of maximum is $\alpha=304.9^\circ$ $\delta=+46.2^\circ$. In spite of making many photographic exposures we still have no photographic or video confirmation of the existence of this stream.
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