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[vsnet-alert 280] HT Cas photometry

Dear all,

Attached to this e-mail is a postscript graph showing two consecutive eclipses
of HT Cas. Photometry was unfiltered using a Sony CCD and 30cm Newtonian
and the brightness of HT Cas was measured relative to the nearby
GSC 4030.00719. Eclipse duration was 550 sec in each case and the times of
minima were:

1995 November 19, 18:24:20 UTC (JD 2450041.26690)
1995 November 19, 20:10:30 UTC (JD 2450041.34063)

These agree very well with predictions based on Kato's vsnet-alert 277 message.

The sample period in the following plot is approximately 25s (20s exposure
+ 5s read-out). My location is Chelmsford, UK.

More information, including a CCD image of the field is available on the
pages of The Astronomer at http://vsnet.demon.co.uk/astronomer/htcas.html

Regards Nick James.

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840 351 M
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840 3038 M
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4342 351 M
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5218 351 M
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6093 351 M
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3904 71 M
(Seconds from epoch) Cshow
3904 4969 M
(Two consecutive eclipses of HT Cas on 1995 November 19) Cshow
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6486 4626 M
(Epoch = 18:24:20 UTC) Rshow
6654 4626 D
1803 3422 D
1908 3546 D
2018 3410 D
2127 3365 D
2232 3731 D
2337 3622 D
2447 3477 D
2552 3333 D
2661 3592 D
2766 3790 D
2876 3626 D
2981 3281 D
3090 3494 D
3195 3148 D
3300 2863 D
3410 2975 D
3515 2664 D
3624 2346 D
3729 1712 D
3839 1322 D
3944 1133 D
4053 1172 D
4158 705 D
4268 612 D
4373 789 D
4482 584 D
4587 669 D
4697 1035 D
4802 1301 D
4911 1471 D
5016 2038 D
5126 2671 D
5231 2881 D
5340 3130 D
5446 3444 D
5555 3495 D
5660 3456 D
5769 3473 D
5875 3523 D
5984 3625 D
6093 3812 D
6203 3624 D
6308 3578 D
6417 3540 D
6632 3274 D
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6486 4486 M
(Epoch = 20:10:30 UTC) Rshow
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1584 3075 A
1689 3487 A
1799 3275 A
1904 3245 A
2013 3332 A
2118 3002 A
2223 3314 A
2333 3467 A
2442 3124 A
2552 3242 A
2657 3531 A
2766 3194 A
2871 3244 A
2981 2851 A
3090 2458 A
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3414 2600 A
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3848 1154 A
3953 969 A
4062 775 A
4172 775 A
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4496 639 A
4601 1050 A
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4925 1498 A
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6001 3396 A
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