原文来自Yahoo的comets-ml邮件组:
A Vegas Luna has advised:
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according to my calculations the new comet C2008 C1 Chen-Gao will be occulted by the moon on Apr. 9th - 10th after it's close encounter with Holmes at the end of this month .. it should be fairly bright since perihelion is Apr. 17th ..
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On my calculations using the latest set of elements for the comet (MPEC 2008-F03], an occultation occurs (D) on April 10, with the night-time region of visibility being China, Korea, far-eastern Russia, and Japan. At the time the moon is a very favourable 25% illuminated. However the total mag of the comet will only be 11.8 - which means the maximum surface brightness will be much less. Consequently I expect the earthshine will be much brighter than the comet.
For those interested in monitoring this event, indicative times [UTC] are as follows:
y m d h m s(世界时)
08 Apr 10 13 38 29 北京
08 Apr 10 14 16 29 Hanoi
08 Apr 10 13 43 25 Seoul
08 Apr 10 13 49 0 上海
08 Apr 10 13 56 25 台北
08 Apr 10 13 45 26 Tokyo
Note that these times could change by over a minute (especially for Hanoi) as a result of orbit improvements between now and the event.
If there is interest, I could post a more comprehensive set of predictions. ..
Dave Herald
Canberra, Australia
Ephemeris of C/2008 C1 (Chen-Gao) MPEC 2008-F03 at 23 hrs UT (J2000)
y m d h m s o ' " delta RSun Elong Phase Mag "/min PA
2008 Mar 22 4 13 4.8 41 33 45 1.315 1.318 67.9 44.5 11.8 2.78 132.5
2008 Mar 23 4 17 25.1 40 48 32 1.318 1.314 67.5 44.5 11.8 2.78 132.9
2008 Mar 24 4 21 40.3 40 3 2 1.321 1.310 67.1 44.5 11.8 2.77 133.3
2008 Mar 25 4 25 50.7 39 17 20 1.324 1.306 66.7 44.6 11.8 2.76 133.7
2008 Mar 26 4 29 56.3 38 31 25 1.328 1.302 66.3 44.6 11.8 2.76 134.0
2008 Mar 27 4 33 57.2 37 45 22 1.332 1.298 65.9 44.6 11.8 2.75 134.4
2008 Mar 28 4 37 53.5 36 59 12 1.336 1.295 65.5 44.6 11.8 2.74 134.7
2008 Mar 29 4 41 45.5 36 12 56 1.340 1.292 65.1 44.6 11.7 2.73 135.0
2008 Mar 30 4 45 33.2 35 26 37 1.345 1.288 64.7 44.5 11.7 2.72 135.2
2008 Mar 31 4 49 16.7 34 40 16 1.350 1.286 64.3 44.5 11.7 2.71 135.5
2008 Apr 1 4 52 56.2 33 53 56 1.355 1.283 63.9 44.4 11.7 2.69 135.7
2008 Apr 2 4 56 31.8 33 7 37 1.360 1.280 63.6 44.4 11.7 2.68 136.0
2008 Apr 3 5 0 3.6 32 21 22 1.366 1.278 63.2 44.3 11.7 2.67 136.2
2008 Apr 4 5 3 31.7 31 35 13 1.371 1.275 62.8 44.2 11.7 2.65 136.4
2008 Apr 5 5 6 56.3 30 49 9 1.377 1.273 62.4 44.1 11.7 2.64 136.6
2008 Apr 6 5 10 17.4 30 3 13 1.383 1.271 62.0 44.1 11.7 2.62 136.7
2008 Apr 7 5 13 35.2 29 17 26 1.390 1.270 61.6 43.9 11.8 2.61 136.9
2008 Apr 8 5 16 49.7 28 31 50 1.396 1.268 61.3 43.8 11.8 2.59 137.0
2008 Apr 9 5 20 1.1 27 46 24 1.403 1.267 60.9 43.7 11.8 2.57 137.2
2008 Apr 10 5 23 9.5 27 1 11 1.410 1.266 60.5 43.6 11.8 2.56 137.3
2008 Apr 11 5 26 14.9 26 16 11 1.417 1.265 60.2 43.4 11.8 2.54 137.4
2008 Apr 12 5 29 17.5 25 31 24 1.424 1.264 59.8 43.3 11.8 2.52 137.5
2008 Apr 13 5 32 17.4 24 46 53 1.431 1.263 59.5 43.1 11.8 2.50 137.6
2008 Apr 14 5 35 14.5 24 2 37 1.439 1.263 59.1 43.0 11.8 2.49 137.7
2008 Apr 15 5 38 9.2 23 18 38 1.447 1.262 58.8 42.8 11.8 2.47 137.8
2008 Apr 16 5 41 1.3 22 34 55 1.454 1.262 58.4 42.6 11.8 2.45 137.8
2008 Apr 17 5 43 51.1 21 51 29 1.462 1.262 58.1 42.5 11.8 2.43 137.9
2008 Apr 18 5 46 38.5 21 8 22 1.470 1.263 57.8 42.3 11.9 2.41 137.9
2008 Apr 19 5 49 23.7 20 25 32 1.478 1.263 57.4 42.1 11.9 2.39 138.0
2008 Apr 20 5 52 6.8 19 43 2 1.487 1.264 57.1 41.9 11.9 2.37 138.0
2008 Apr 21 5 54 47.8 19 0 50 1.495 1.265 56.8 41.7 11.9 2.36 138.0
2008 Apr 22 5 57 26.9 18 18 58 1.504 1.266 56.5 41.5 11.9 2.34 138.0
2008 Apr 23 6 0 4.0 17 37 25 1.512 1.267 56.2 41.3 11.9 2.32 138.0
2008 Apr 24 6 2 39.3 16 56 11 1.521 1.268 55.9 41.0 11.9 2.30 138.0
2008 Apr 25 6 5 12.9 16 15 18 1.530 1.270 55.6 40.8 12.0 2.28 138.0
2008 Apr 26 6 7 44.7 15 34 44 1.539 1.272 55.3 40.6 12.0 2.26 138.0
2008 Apr 27 6 10 15.0 14 54 30 1.548 1.274 55.0 40.4 12.0 2.25 138.0
2008 Apr 28 6 12 43.6 14 14 37 1.557 1.276 54.7 40.1 12.0 2.23 137.9
2008 Apr 29 6 15 10.8 13 35 3 1.566 1.278 54.5 39.9 12.0 2.21 137.9
2008 Apr 30 6 17 36.6 12 55 49 1.575 1.281 54.2 39.7 12.1 2.20 137.9
2008 May 1 6 20 1.0 12 16 55 1.584 1.283 54.0 39.4 12.1 2.18 137.8
2008 May 2 6 22 24.1 11 38 20 1.593 1.286 53.7 39.2 12.1 2.16 137.8
[ 本帖最后由 BA2CR 于 2008-3-23 07:33 编辑 ] |
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